Title of Invention

NON-AQUEOUS COATING COMPOSITIONS COMPRISING A MODIFIED PIGMENT

Abstract The present invention relates to a dispersant composition comprising at least one anionic surfactant and at least one polymer comprising at least one salt of carboxylic acid group. Also disclosed are pigment compositions and non-aqueous coating compositions comprising the dispersant composition.
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TITLE
NON-AQUEOUS COATING COMPOSITIONS BACKGROUND OF THE INVENTION
1. Held of the Invention,
[0001] The present invention relates to a dispersant composition comprising at
least one anionic surfactant and at least one polymer comprising at least one salt of a carboxylic acid group. The present invention further relates to a modified pigment composition and a non-aqueous coating composition comprising the dispersant
compositions.
2. Description of the Related Art.
[0002] Coating compositions are used for decorative, protective, and
functional treatments of many kinds of surfaces. These surfaces include coils, metals, appliances, furniture, hardhead, lumber and plywood, marine, automobile, cans, and paperboard. Some coatings, such as those on undersea pipelines, are for protective purposes. Others, such as exterior automobile coatings, fulfill both decorative and protective functions. Still others provide friction control on boat decks or car seats. Some coatings control the fouling of ship bottoms, others protect food and beverages in cans. Silicon chips, printed circuit panels, coatings on wave-guide fibers for signal transmission, and magnetic coatings on videotapes and computer disks are among many so-called hi-tech applications for coatings.
[0003] Surface coating compositions are generally more or less viscous liquids
with three base components: a film-forming substance or combination of substances called the resin or binder, a pigment or combination of pigments, and a volatile liquid. The combination of resin and volatile liquid is often referred to as the vehicle. Vehicles may be aqueous or non-aqueous and may be in a solution form or as a dispersion of

fine binder particles in a non-solvent. The components and manufacturing of coating compositions such as aqueous coatings are further discussed in the Concise Encyclopedia of Polymers, Science and Engineering, pages.160-171 (1990), which is incorporated herein by reference.
[0004] Pigments are finely divided, insoluble, solid particles dispersed in the
coating vehicle and are distributed throughout the resin or binder in the final film. A wide variety of conventional black and colored pigments have been used in coating compositions. In addition, aqueous and non-aqueous inks and coating compositions comprising modified carbon products having attached organic groups are described in U.S. Patent Nos. 5,672,198 and 5,713,988, both incorporated in their entireties herein by reference.
[0005] Surfactants may also be added to coating compositions to help improve
performance. Typically, these surfactants are used in combination with the pigments of the coating compositions and, as such, are therefore referred to as dispersants. Several different classes or types of dispersants have been used in coating compositions. The choice of clispersant is dependent on a variety of factors, including the properties of the pigment, particle size, and the type of resin or binder. However, the dispersant can often have a negative impact on properties such as color development. Therefore, the amount of dispersant must be adjusted for the components used in order to obtain coating compositions with good overall properties.
[0006] Thus, while dispersants have been used in coating compositions, there
remains a need for dispersant compositions which enable specific types of pigments to be dispersed in a non-aqueous vehicle while also resulting in good color performance.
SIHMMARY OF THE INVENTION
[0007] The present invention relates to a dispersant composition comprising i)
at least one anionic surfactant and ii) at least one polymer comprising at least one salt of a carboxylic acid group. Preferably, the anionic surfactant is insoluble in water, such as a water insoluble sodium dialkyl sulfosuccmate.

[0008] The present invention further relates to a pigment composition
comprising a) at least one pigment, and b) at least one dispersant composition as described herein. Preferably the pigment is a modified carbon product comprising a carbon product having attached at least one organic group such as an anionic group. The pigment composition may be either in a dry form or present in an aqueous vehicle. [0009] The present invention further relates to a non-aqueous coating
composition comprising a) a non-aqueous vehicle comprising a resin and a non-aqueous solvent, b) at least one pigment, and c) at least one dispersant composition as described herein.
[0010] It is to be understood that both the foregoing general description and
the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the present invention, as claimed.
DETAILED DESCRIPTION OF THE INVENTION
[0011] The present invention relates to dispersant compositions, as well as to
pigment and non-aqueous coating compositions comprising the dispersant compositions.
[0012] The dispersant composition of the present invention comprises at least
one anionic surfactant and at least one polymer comprising at least one salt of carboxylic acid group. Additionally, the dispersant composition may further comprise a solvent. The solvent may be aqueous OT non-aqueous, but is preferably an aqueous solvent - i.e., the solvent comprises water and, optionally, water soluble or miscible solvents. Preferably, the solvent is water, and the dispersant composition is a water-based dispersani composition.
[0013] The anionic surfactant can be any surfactant which comprises at least
one negatively charged ionic group. Preferably the anionic surfactant comprises at least one salt of a sulfonate group, such as an alkyl or an aiylsulfonate. For this preferred embodiment, therefore, the anionio surfactant comprises at least one group having the formula R-SO3- M+ groups. R can be any alkyl or an aryl group but generally contains less than 20 carbons, for the solubility reasons discussed in more

detail below. Most preferred are anionic surfactants which comprise a salt of a sulfosucdnate group. The salt can be either an inorganic or an organic counterion to the anionic group of the surfactant. Examples include Na+, K+ Li-+ NH4+ and NR'4+ where R' represents hydrogen or an organic group such as a substituted or unsubstituted aryl and/or alkyl group. Preferred are inorganic salts such as a sodium or potassium salt. Therefore, a most preferred anionic surfactant is a sodium sulfosuccinate, including sodium dialkyl sulfosuccinates such.as sodium dioctyl sulfosuccinate.
[0014] The dispersant composition of the present invention further comprises
at least one polymer comprising at least one salt of a caiboxylic acid group. Examples include homo- or copolymers prepared from acrylic or rnethacrylic acid and polyesters, polyamides, or polycarbonates that contain -C00H end-groups. Preferably, the polymer is a copolymer of acrylic or metloacrylic acid and the polymer comprises at least one salt of an acrylic or methacrylic arid repeat group.
[00151 The salt may be either an inorganic or an organic salt. Thus, the salt of
a carboxylic acid group has the general formula -COO- M+, wherein M+ can be either an inorganic counterion or an organic counterion. Examples include Na+, K+, Li-+, NH4+, and NR'4+, where R' represents hydrogen or an organic group such as a substituted or unsubstituted aryl and/or alkyl group. Preferably the polymer comprises an ammonium salt of a carboxylic acid group.
[0016] Molecular -weight determines many properties of both surfactants and
polymers, including solubility, viscosity, and stability. Therefore, while the anionic surfactant and polymer used in the dispersant composition of the present invention can have any molecular weight, generally, very high molecular weights are not preferred. Thus, the molecular weight of the anionic surfectant is preferred to be between about 100 and 10000, more preferably about 200 to 5000, and most preferably between about 400 and 1000. The molecular weight of the carboxylic acid group-containing polymer may be similar to that described for the anionic surfactant. Preferably, the polymer molecular weight is between about 500 and 100000, more preferably between about 5000 and 50000, and most preferably between about 10000 and 4O000.

[0017] The dispersant composition may further comprise additional
components, such as antioxidants, biocides, and the like. As described above, in a preferred embodiment, the dispersant composition further comprises an aqueous solvent, such as water. Furthermore, the pH of the composition can be adjusted depending on the intended use of the material. Thus, the dispersant composition may further comprise at least one base. This base may correspond to the saw of the polymer comprising at least one salt of a carboxylic acid. Examples of bases iticlude amines such as ammonia and hydroxide reagents such as a salt having an hydroxide counterion including, but not limited to, sodium hydroxide, potassium hydroxide, lithium hydroxide, and ammonium hydroxide. Other hydroxide salts, as well as mixtures of hydroxide reagents, can also be used. Furthermore, other alkaline reagents may also be used which generate OH" ions in an aqueous medium. Examples include carbonates such as sodium carbonate, bicarbonates such as sodium bicarbonate, and alkoxides such as sodium methoxide and sodium ethoxide.
[0018] The amount of each component can be varied depending on the
intended use of the dispersant composition. The amount of non-ionic surfactant is typically between about 5% and 20%, preferably between about 9% and 16%, and more preferably between about 11% and 14%, based on the total weight of the dispersant composition. The amount of polymer comprising at least one salt Of a carboxylic acid group is generally between about 3% and 25%, preferably between about 7% and 20%, and more preferably between about 10% and 15%, based on the total weight of the dispersant composition.
[0019] As described above, preferably the dispersant composition further
comprises an aqueous solvent, such as water. For this preferred embodiment, the %solids of the dispersant composition is preferably greater than 10%, more preferably greater than 15%, and most preferably greater than 25%.
[0020] It is preferable that at least one of the components of the dispersant
composition be insoluble in water. For example, the anionic surfactant may be a water insoluble material. By "insoluble" is meant that at least one of the components does not dissolve in water at room temperature at concentrations greater than 2% and remain soluble under these conditions for a long period of time, such as longer than a

day. Insolubility may be a result of many different factors. For example, when the anionic surfactant is a salt of an alkyisulfonate, insolubility may be a result of the type of alkyl group and the type of salt or counterion. When the anionic surfactant is insoluble in water, the polymer comprising at least one salt of cartoxylic acid group should be water soluble. Thus, it may be said that the polymer acts as a dispersing or solubilizing agent for the water-insoluble non-ionic surfactant, thereby producing an aqueous solution or dispersion of the insoluble surfactant.
[0021] The present invention further relates to a pigment composition comprising at least one pigment and the dispersant composition described above. The pigment may be any pigment known in the art but is preferably a carbonaceous pigment, and, in particular, is a carbon product. Examples of suitable carbon products include, but are not limited to, graphite, carbon black, vitreous carbon, carbon fibers, activated charcoal and activated carbon. The carbon may be of the crystalline or amorphous type. Finely divided forms of the above are preferred; also, it is possible to utilize mixtures of different carbons. Of these carbon products, carbon black is preferred. The pigment composition may be either in a dry form or may farther comprise an aqueous vehicle such as water. Thus, the pigment composition may be anaqueous dispersion of a pigment and the dispersant composition described above.
[0022] Pigments are often categorized by their color strength. For example,
carbon blacks may be referred to as high color blacks, medium color blacks, or regular
color blacks. Any of these carbon blacks can be used for the pigment composition of
the present invention. In a preferred embodiment, the pigment composition comprises
carbon products referred to in the art as high color blacks which generally have BET
surface area values greater than or equal to about 240 m2/g. Preferably, the high color
carbon blades used in the pigment composition of the present invention have a BET
surface area values greater than or equal to about 300 m2/g, more preferably greater
than or equal to about 400 m2/g, and most preferably greater than or equal to about
500 rn2/g. Examples of high color blacks include, but are not limited to Monarch®
1000, Monarch® 1100, Monarch® 1300, Monarch® 1400, Monarch® 1500, Black
Pearls® 1000, Black Pearls®1100, Black Pearls® 1300, and BlackPearis® 1400.

[0023] These so-called high color carbon black also further have defined
DBPA (dibutyl phthalate absorption) values. DBPA is a measure of the structure or branching of the carbon product. The greater the structure, in general, the better the dispersibility of the carbon product in, for example, a coating composition.However, the greater the structure, the higher the viscosity of the coating composition. Also, higher structure generally results in poorer color performance - lower gloss and jetness. Thus, preferred high color carbon blacks will have DBPA values between about 50 and 150 cc/100 g. Most preferred are those that further have a DBPA value between about 50 and 100 cc/100 g.
[0024] In another preferred embodiment, the pigment composition of the
present invention comprises carbon products referred to in the art as medium color blacks and generally have BET surface area values between about 150 m2/g and 240 m2/g. Preferably, the medium color carbon blacks used in the pigment composition of the present invention have BET surface area values between about 170 and 240 m2/g and more preferably between about 200 and 230 m2/g. The medium color blacks further have DBPA values between about 50 and 150 cc/100 g. Most preferred are those that further have a DBPA value between about 60 and 130 oc/100 g. Examples of medium color blacks include, but are not limited to, Monarch® 700, Monarch® 800, Monarch® 880, Monarch® 900, Black Pearls® 700, Black Pearls® SOO, Black Pearls® 880, and Black Pearis® 900.
[0035] In another embodiment, the pigment composition of the present
invention comprises carbon blacks that have been oxidized in order to increase the amount of oxygen functionality on the surface. Oxidized carbon blacks are well known in the art and are typically prepared by the reaction of an oxidant, such as nitric add or ozone, with a base carbon black. The increase in functionality on the surface typically gives rise to a decrease in pH. Thus, oxidized carbon blacks are typically acidic. [0026] In another embodiment, the pigment composition of the present
invention comprises a modified pigment having attached at least one organic group. Preferably, the modified pigment is a modified carbon product. The modified carbon product may have BET surface area values between about 350 and 600 m.2/g, and more preferably between about 350 and 500 m2/g. While any modified carbon product with

BET surface area values greater than or equal to 350 m2/g can be used in the pigment composition of the present invention, preferred are those which further have DBPA values between about 60 and 150 cc/100 g. Most preferred are those that further have a DBPA value between 80 and 120 cc/100 g.
[0027] The modified carton products are prepared using methods known to
those skilled in the art such that chemical groups (e.g., polymeric and organic) are attached to the pigment, providing a more stable attachment of the groups onto the pigment compared to adsorbed groups, e.g., polymers, surfactants, and the like. For example, the modified carbon products can be prepared using the methods described in U. S. Patent Nos. 5,55439, 5,851,280, 6,042,643, 5,707,432, and 5,837,045, and PGT Publication WO 99/23174, the descriptions of which are fully incorporated herein by reference. The modified carbon products can be prepared from any of the carbon products described above. Preferably, the carbon product is either carbon black or an oxidized carbon black.
[0028] The attached organic group is chosen depending on a variety of factors,
including the specific components of the dispersant composition as well as the intend use of the pigment composition This allows for greater flexibility by tailoring the modified cartoon product to the specific application. The organic group may comprise an ionic group, an ionizable group, or a mixture of an ionic group and an ionizable group. An ionic group is either axrionic or cationic and is associated with a counterion of the opposite charge including inorganic or organic counterforts such as Na+, K+, LI*, NH4+,NH4 '+ acetate, N(V, SO4-2, OH-, and CT, where R' represents hydrogen or an organic group such as a substituted or unsubstituted aryl and/or alkyl group. An ionizable group is one that is capable of forming an ionic group in the medium of use. Thus, preferably the organic group is an organic ionic group. Organic ionic groups include those described in U. S. Patent No. 5,698,016, the description of which is fully incorporated herein by reference.
[0029] Preferably, the organic group comprises at least one anionic group,
which is a negatively charged ionic group. Anionic groups may be generated from groups having ionizable substituents that can form onions, such as acidic substituents, or may be the anion in the salts of ionizable substituents. Preferably, when the



[0033] The modified carton products may be purified by washing, such as by
filtration, centrifugation, or a combination of the two methods, to remove unreacted raw materials, byproduct salts and other reaction impurities. The products may also be isolated, for example, by evaporation or it may be recovered by filtration and drying using known techniques to those skilled in the art. Dispersions of the modified carbon products may be further purified or classified to remove impurities and other undesirable free species which can co-exist in the dispersion as a result of the manufacturing process. For example* a dispersion of the modified carbon product can be subjected to a classification step, such as centrifogation, to substantially remove particles having a size above about 1.0 micron. In addition, the dispersion can be purified to remove any undesired free species, such as unreacted treating agent. Known techniques of ultrafiltration/diafiltration using a membrane or ion exchange may be used to purify the dispersion and remove a substantial amount of free ionic and unwanted species. Also, an optional exchange of counterions whereby the counterfoils that form a part of the modified carbon products can be exchanged or substituted with alternative counterions (including, e.g., amphipbilic ions) utilizing known ion exchange techniques such as ultrafiltratbn, reverse osmosis, ion exchange columns and the like. Particular examples of counterions that can be exchanged include, but are not limited to acetate, and Br". The removal of
impurities from the modified caibon products may also improve the perfonnance of the pigment compositions, in particular, in the coating compositions described below. [0034] The pigment compositions may be prepared by any method known to
one skilled in the art. In particular, the components may be added in any order. For example, for a pigment composition comprising a modified carbon product, the dispersant composition may either be added to the modified carbon product or vice versa. Also, the dispersant composition may be added anywhere along the process of preparing and isolating the pigment. For example, for a pigment composition comprising a modified caibon product, the dispersant composition may be added either prior to or after a pelletizing step (or other steps for changing the form of the product for improved handling), a drying step, or a pre-packing step.

[0035] The dispersant and pigment compositions of the present invention can
be used in a variety of applications. Examples include inks, including inkjet inks, coatings, adhesives, plastics, and sealants. In particular, the dispersant and pigment compositions described herein have been found to be useful in aqueous coating applications.
[0036] Thus, the present invention relates to a non-aqueous coaling
composition comprising an non-aqueous vehicle, at least one pigment, and at least one dispersant composition. The pigment and dispersant composition are as described above. The pigment can be any pigment described above but is preferably a modified carbon product having attached at least one organic group, such as an anionic group. [0037] In general, as discussed above, a coating composition comprises a
pigment dispersed in a solvent and a binder or resin (the vehicle). The vehicle for the coating compositions of the present invention is a non-aqueous vehicle and comprises a non-aqueous solvent and a resin. The composition of the vehicle can vary depending on the conditions and requirements for the final coating. For example, the resin content can vary between about 70-100%,
[.003S] The resin may be any resin used in non-aqueous coating compositions.
Examples of resins or binders useful for the non-aqueous coating composition of the present invention include, but arc not limited to, acrylic resins, alcyd resins, polyurethane resins, epoxy resins, and vinyl-chloride-copolymer resins. The non-aqueous solvent can include any organic solvents such as an aromatic solvent (such as xylene), a acetate solvent (such as butyl acetate), a ketone solvent (such as acetone or mcthyiethyl ketone), oi a glycol, The non-aqueous solvent is often related to the type of resin or binder and will also depend on the formulation used and the final application. The non-aqueous solvent may be water raiscible. Therefore, the non-aqueous solvent may include some water but in amounts that are low, such as between nearly 0% and 20%.
[0039] The vehicle may also contain optional additives which can be used to
improve such properties as viscosity, leveling, and dry time. Examples include cosolvents (in particular, water soluble solvents for aqueous coatings), surfactants, and

. fillers such as clays, tasks, silicas, and carbonates. Additionally, flow modifiers, leveling aids, and biocides can be added.
{0040) The coating compositions of the present invention can be prepared
using any technique known to those skilled in the art. Thus, for example, the pigment can be combined with a liquid vehicle and other coating components in a high speed mixer and/or mill. The amount of carbon product used in the coating compositions of the present invention is dependent on the desired performance of the resulting coating. In general, these coating compositions comprise up to about 30% by weight pigment, such as a carbon product. The amount of carbon product can be adjusted in order to optimize such properties as jetness, viscosity, and dispersion stability. [0041) The coating compositions of the present invention can be used in a
variety of different end-use applications, such as, for example, automotive topcoats, to give coatings with improved overall performance properties. The pigment compositions of the present invention can be readily dispersed in the coating compositions to obtain coatings with improved jetness and bluetone. This will be further clarified by the following examples, which are intended to be purely exemplary of the present invention.
EXAMPLES
Example 1
[0042] This example describes the preparation of an exemplary dispersant
composition of the present invention.
[0043] To a beaker placed on a hot plate set at 70°C was added 250 g of
water. Once the temperature reached 70°C, 75 g of Aerosol OT (an anionic surfectant) was slowly added. After approximately 45 minutes of continuous stirring, a premix of 3.5 g of ammonia and 56.5 g of water was added, and the mixture was stirred with good agitation for approximately 5 minutes. To this was then added 75 g of NeoCryl BT-24 (a waterborne acrylic resin). While maintaining the temperature at approximately 60°C, the mixture was stirred under good agitation for another 10 minutes. The resulting dispersant composition was then used for the preparation of a pigment composition, as described in more detail below.

Example 2
[0044] This examples describes the preparation of an exemplary pigment
composition of the present invention.
[0045] A pin pelletizer (10 horsepower) was heated to 70°C. 300 g of
Emperor® 2000 pigment black (a modified carbon black having attached groups available from Cabot Corporation) was added to the pelletizer chamber and premixed at 400 rpm for 2 minutes, 85 g of the dispersant composition of Example 1 was also added to the chamber, and mixing was continued for another 10 minutes at 500 rpm. The resulting pigment composition was then removed from the chamber, dried at 60-70°C in an oven for 3 hours, and was used to prepare coating compositions, as described in more detail below.
Example 3 and Comparative Examples 1-5
[0046] Example 3 demonstrates the preparation and analysis of an exemplary
coating composition of the present invention.
[0047] For then example and the comparative examples, the following
procedure was followed. A millbase was prepared by pranking 35 parts of xylene with 15 parts of DispcrBYK 161 (a dispersing agent available from BYK Chemie) in the present of 45 parts of Macrynal 510 (a resin available from UCB) in a high speed DisperMat mker with good agitation for 2-3 minutes. To this premix was added 10 parts of the desired pigment (shown in Table 1 below) at 2000 rpm for 2 minutes. Then the mixing speed was increased to 4,000 rpm for another 5 minutes. The resulting mixture was then recirculated through an Either mill at 10.0 m/s tip speed for 20 minutes at room temperature using zirconium silicate beads (0.6-0.8 mm). The resulting millbase was then used to prepare a coating composition, [0048J A coating composition was prepared by mixing 400 parts of Setalux
Macrynal 510 with 97.5 parts of Cymel 325 mdamine resin (available from Cytec) in the presence of 100 parts of butyl acetate until a homogeneous solution is achieved to create a letdowa masterbatch. 59.75 parts of this letdown masterbatch and 10 parts of

the millbase described above were combined under good agitation to prepare a finish coating composition.
[0049] A base coat was prepared by spraying out the coating composition onto
cold roll steel. This was used for a mono-coat system. The panels were flashed off at room temperature for 10 minutes and force dried at 150°C for 20 minutes to cure. [0050] Properties of the resulting coatings were measured and are shown in
Table 1 below. A Hunter Color Meter was used to measure L jetness)., a (red tone), and b (bluetone) values. A lower L value means a greater level of jetness while the more negative a value for b, the better the bluetone. Me is the color-dependent black value which can be calculated from L, a, and b. A higher Me value also indicates a greater level of jetness.
[0051] As can be seen from the results in Table 1, the coating composition of
Example 3 has a considerably higher Me value along with a much lower L value in both mono-coat and base coat/clear coat systems. In addition, bluetone is comparable or, in most cases, also improved., Thus, the dispersant compositions of the present invention can be used to prepare pigment compositions which give coating composition with good jetness and bluetone compared to coating compositions of the Comparative Examples.

Example 4 and Comparative Examples 6-10
[0052] Example 4 demonstrates the preparation and analysis of an exemplary
coating composition of the present invention.
[0053] For this example and the comparative examples, a millbase was
prepared using a procedure similar to that of Example 3. A millbase was prepared by prembdng 35 parts of xylene with 15 parts of DisperBYK 161 (a dispersing agent available from BYK Chemie) in the present of 45 parts of Setalux 17-1445 (a resin available from Akzo Nobel) in a high speed DisperMat mixer with good agitation for 2-3 minutes. To this premix was added 10 parts of the desired pigment (shown in Table 2 below) at 2000 rpm for 2 minutes. Then the mixing speed was increased to 4,000 rpm for another 5 minutes. The resulting mixture was then recirculated through an Eiger mill at 10.0 m/s tip speed for 20 minutes at room temperature using zirconium silicate beads (0.6-0.8 mm). The resulting millbase was then used to prepare a coating compositioa
[0054] A coating composition was prepared by mixing 400 parts of Setalux 17-
1445 with 97.5 parts of Cymel 325 melaraine resin (available from Cytec) in the presence of 100 parts of butyl acetate until a homogeneous solution is achieved to create a letdown masterbatch. 59.75 parts of this letdown masterbatch and 10 parts of the millbase described above were combined under good agitation to prepare a finish . coating composition.
[0055] A base coat was prepared by spraying out the coating composition onto
cold roll steel. This was used for a mono-coat system. The panels were flashed off at room temperature for 10 minutes and force dried at 150DC for 20 minutes to cure. [0056] Properties of the resulting coatings were measured and are shown in
Table 1 below. A Hunter Color Meter was used to measure L (jetness), a (red tone), and b (bluetone) values. A lower L value means a greater level of jetness while the more negative a value for b, the better the bluetone. Me is the color-dependent black value which can be calculated from L, a, and b. A higher Me value also indicates a greater level of jetness.


[0057] As can be seen from the results in Table 1, the coating composition of
Example 3 has a considerably higher Me vahie along with a much lower L value in both mono-coat and base coat/clear coat systems. In addition, bluetone is comparable or, in most cases, also improved. Thus, the dispersant compositions of the present invention can be used to prepare pigment compositions which give coating composition with good jetness and bluetone compared: to coating compositions of the Comparative Examples.
[0058] As a result, coating compositions of the present invention, containing
the pigment compositions and dispersant compositions described herein, have been found to provide high color performance in coating applications. [0059] The foregoing description of preferred embodiments of the present
invention has been presented for the purposes of illustration and description. It is riot intended to be exhaustive or to limit the invention to the precise form disclosed. Modifications and variations are possible in light of the above teachings, or may be acquired from practice of the invention. The embodiments were chosen and described in order to explain the principles of the invention and its practical application to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto, and their equivalents. What we claim is:

CLAIMS
1. A dispersant composition comprising i) at least one anionic surfactant and ii) a± least one polymer comprising at least one salt of a carboxylic acid group.
2. The dispersant composition of claim 1, wherein the anionic surfactant comprises at least one salt of a sulfonate group.
3. The dispersant composition of claim 2, wherein the sulfonate group is an alkyl or axylsulfonate group.
4. The dispersant composition of claim 2, wherein the sulfonate group is an alkylsuifonate group.
5. The dispersant composition of claim 1, wherein the anionic surfactant comprises a salt of a sulfosuccinate group.
6. The dispersant composition of claim 1, wherein the anionic surfactant is a sodium dialkyl sulfosuccinate.
7. The dispersant composition of claim 1, wherein the anionic surfactant is sodium dioctyl sulfosuccinate.
8. The dispersant composition of claim 1, wherein the anionic surfactant is insoluble in water.

9. The dispersant composition of claim 1, wherein the polymer comprises an ammonium salt of a carboxylic acid.
10. The dispersant composition of claim 1, wherein the polymer is a salt of a copolymer of acrylic acid.

11. The dispersant composition of claim 1. wherein the polymer is an ammonium salt of a copolymer of acrylic acid and methyl methacrylate.
12. The dispersant composition of claim 1, wherein the polymer has a molecular weight between about 5000 and 50000.
13. The dispersant composition of claim 10, wherein the polymer has a molecular weight between about 10000 and 40000.
14. The dispersant composition of claim 1, wherein the anionic surfactant is a sodium dialkyl sulfosuccinate and wherein the polymer is an ammonium salt of a copolymer of acrylic acid and methyl methacrylate.
15. The dispersant composition of claim 1, wherein the polymer is soluble in water.
16. The dispersant composition of claim 1, iurther comprising an aqueous solvent.

17. The dispcrsant composition of claim 16 further comprising water.
18. The dispcrsant composition of claim 1, further comprising at least one base.
19. The dispersant composition of claim 18, wherein the base is an hydroxide reagent or an amine.
20. The dispersant composition of claim 18, wherein the base is ammonia.
21. A pigment composition comprising a) at least one pigment, and b) at least one dispersant composition composing i) at least one anionic surfactant and ii) at least one polymer comprising at least one salt of a caiboxylic acid group.

22. The pigment composition of claim 21, wherein the pigment is a modified carbon product comprising a carbon product having attached at least one organic group.
23. The pigment composition of claim 21, wherein the organic group comprises at least one ionic group, at least one ionizable group, or a mixture thereof. -
24. The pigment composition of claim 21, wherein the organic group comprises at least one anionic group.
25. The pigment composition of claim 21, wherein the organic group comprises at least one carboxylic group, a sulfonate group, or salts thereof.
26. The pigment composition of claim 21, wherein the organic group is a caiboxypbenyl group, a sulfophenyl group, or salts thereof.
27. The pigment composition of claim 21, further comprising an aqueous vehicle.
28. The pigment composition of claim 27, wherein the aqueous vehicle is water.
29. The pigment composition of claim 21, wherein the anionic surfactant is a sodium dialkyl sulfosucdnate, the polymer is an ammonium salt of a copolymer of acrylic acid and methylmethaciylate, and the pigment is a modified carbon product comprising a carbon product having attached at least one sulfonate group.
30. A non-aqueous coating composition comprising a) a non-aqueous vehicle comprising a resin and a non-aqueous solvent, b) at least one pigment, and c) at least one dispersant composition comprising i) at least one anionic surfactant and ii) at least one polymer comprising at least one salt of a carboxylic acid group.

31. The non-aqueous coating composition of claim 22, wherein the resin is an acrylic resin, a polyurethane resin, an epoxy resin, a polyester resin, an alkyd resin, or a vinyl chloride-copolymer resin.
32. The non-aqueous coating composition of claim 22, wherein the resin is an acrylic resin,
33. The non-aqueous coating composition of claim 22, wherein the non-aqueous solvent is an aromatic solvent, an acetate solvent, a ketone solvent or a gjycol.
34. The non-aqueous coating composition of claim 22, wherein the non-aqueous solvent is xylene, butyl acetate, acetone, or methylethyl ketone.
35. The non-aqueous coating composition of claim 22, wherein the pigment is a modified carbon product comprising a carbon product having attached at least one organic group.
36. The non-aqueous coating composition of claim 35, wherein the organic group comprises at least one ionic group, at least one ionizable group, or a mixture thereof.
37. The non-aqueous coating composition of claim 35, wherein the organic group comprises an anionic group.

38. The non-aqueous coating composition of claim 35, wherein the organic group comprises a caiboxylic group, a sulfonate group, OT salts thereof.
39. The non-aqueous coating composition of claim 35, wherein the organic group is a carboxyphenyl group, a sulfophenyl group, or salts thereof.
40. The non-aqueous coating composition of claim 30, wherein the anionic surfactant is a sodium dialkyl sulfosuccinate, the polymer is an ammonium salt of a

copolymer of acrylic acid and methylmethaciylate, and the pigment is a modified carbon product comprising a carbon product having attached at least one sulfonate group.
Dated this 1 day of May 2006

Documents:

1481-CHENP-2006 AMENDED PAGES OF SPECIFICATION 08-09-2011.pdf

1481-CHENP-2006 AMENDED CLAIMS 08-09-2011.pdf

1481-chenp-2006 amended pages of specification 20-01-2011.pdf

1481-chenp-2006 form-3 20-01-2011.pdf

1481-chenp-2006 amended claims 20-01-2011.pdf

1481-CHENP-2006 CORRESPONDENCE OTHERS 24-11-2011.pdf

1481-CHENP-2006 CORRESPONDENCE OTHERS 12-06-2012.pdf

1481-CHENP-2006 CORRESPONDENCE OTHERS 08-09-2011.pdf

1481-CHENP-2006 CORRESPONDENCE OTHERS 20-10-2010.pdf

1481-CHENP-2006 CORRESPONDENCE OTHERS.pdf

1481-chenp-2006 examination report reply received 20-01-2011.pdf

1481-chenp-2006 form-1 20-01-2011.pdf

1481-CHENP-2006 FORM-18.pdf

1481-CHENP-2006 FORM-3.pdf

1481-chenp-2006 power of attorney 20-01-2011.pdf

1481-chenp-2006-abstract.pdf

1481-chenp-2006-assignement.pdf

1481-chenp-2006-claims.pdf

1481-chenp-2006-correspondnece-others.pdf

1481-chenp-2006-description(complete).pdf

1481-chenp-2006-form 1.pdf

1481-chenp-2006-form 26.pdf

1481-chenp-2006-form 3.pdf

1481-chenp-2006-form 5.pdf

1481-chenp-2006-pct.pdf


Patent Number 249130
Indian Patent Application Number 1481/CHENP/2006
PG Journal Number 40/2011
Publication Date 07-Oct-2011
Grant Date 03-Oct-2011
Date of Filing 01-May-2006
Name of Patentee CABOT CORPORATION
Applicant Address Two Seaport Lane, Suite 1300, Boston, MA 02210-2019
Inventors:
# Inventor's Name Inventor's Address
1 NGUYEN, Lang, H. 100 Viola Street, Lowell, MA 01851
PCT International Classification Number C09D5/00, C09D07/00
PCT International Application Number PCT/US2004/034957
PCT International Filing date 2004-10-20
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10/694,974 2003-10-28 U.S.A.