Title of Invention

CORROSION RESISTANT REACTORS CONTAINING RE-INFORCED FLUOROPOLYMER PLATES AND PRODUCTION METHODS OF THE SAME

Abstract The invention relates to a reinforced fluoropolymer plate comprising: - a layer of fluoropolymer on one of its faces, - a layer of carbon fibers free from fluoropolymer on the other face, and - a central layer consisting of carbon fibers impregnated with fluoropolymer, whereby, at least part of the sheet of carbon fibers, are impregnated with fluoropolymer, and the preparation thereof. The invention also relates to an acid-corrosion-resistant reactor comprising said plates and the producti on methods of said reactors.
Full Text Field of the invention
The present invention relates to fluoropolymer plates reinforced on one of their
faces with carbon fibers, to a chemical reactor resistant to acid corrosion comprising
said plates, to production methods of same, and to uses thereof in methods performed
in a superacidic medium.
Prior art and technical problem
Reactions in a superacidic medium, in particular fluorination reactions in the
liquid phase, require, in order to be effective, the use of a reaction mixture rich in HF
and SbCl5 (or SbClxFy) and high temperatures (80 to 120°C). Anhydrous HF in the
liquid phase forms a very corrosive superacidic medium with SbCl5. The usual
corrosion-resistant metals and alloys such as stainless steels, inconels, nickel,
hastelloy etc. do not have sufficient resistance for making an industrial reactor.
One solution (JP 07-233102) consists of applying a fluoropolymer lining to the
inside of a stainless steel reactor. Another solution (US 4,166,536 and US 3,824,115)
consists in using a fluoropolymer containing particles of inorganic substances such a
silica, graphite or carbon.
However, application of this type of lining to the inside of the reactor gives rise
to many technical problems as emphasized in patent WO 99/00344:
- deposits of polymers obtained by spraying and melting polymer powders
are porous, the metal is attacked by HF and the lining becomes detached,
- deposits obtained by melting and rotational moulding are thicker and more
impervious, but this technique is limited to small reactors ( and, moreover, these linings, even thick ones, are still slightly permeable
and acids eventually penetrate between the polymer layer and the metal
wall of the reactor and excess pressures are created producing considerable
swelling and deformation of the fluoropolymer lining.
Patent WO 99/00344 proposes to remove these excess pressures by drilling
small holes in the wall of the reactor (0.31 cm to 1.27 cm diameter).
The use of a fluoropolymer lining in an industrial reactor is moreover only
possible at the present time at a low temperature (20 to 40°C) since the coefficient of
expansion of fluoropolymers is very much greater than that of steel. At temperatures
necessary for the fluorination in the liquid phase of chloroalkanes (80 to 120°C),
expansion of the liner is very considerable and brings about structural disruption

(folds, tension, deformation, tears, stripping) aggravated by the low mechanical
strength of the polymer when hpt.
In addition, problems are known of the differential expansion between the
polymer and metal in reactors which brings about detachment and stripping of the
lining. Solutions using multilayer linings of fluoropolymers and resin (US 3,779,854)
and glass fibers exist but are totally unsuitable for use with reactions in a superacidic
medium such as HF.
Thus, up to now, no satisfactory solution has been found for the construction of
reactors that are resistant both chemically and mechanically to superacidic corrosive
media.
Summary of the invention
The object of the invention is to provide fluoropolymer plates reinforced on
one of their faces with carbon fibers and a novel type of reactor comprising these
plates that is resistant both mechanically and chemically to acidic corrosive media.
These plates can constitute a floating inner lining in the reactor, or indeed form
an integral part of the wall of the reactor.
The invention thus relates to:
1. A reinforced fluoropolymer plate comprising a layer of fluoropolymer
on one of its faces, and a sheet of carbon fibers on the other face, at least part of the
sheet of carbon fibers being impregnated with fluoropolymer.
2. The plate according to point 1, in which the polymer-impregnated
thickness represents at least 10% of the thickness of the sheet of carbon fibers,
preferably 10% to 90%, advantageously 30 to 70%.
3. The plate according to point 1 or 2, in which the fluoropolymer is
chosen from the group consisting of polychlorotrifluoroethylene (PCTFE),
polyvinylidene fluoride (PVDF), copolymers of tetrafluoroethylene and
perfluoropropene (FEP), copolymers of tetrafluoroethylene and perfluoro-
propylvinylether (PFA), copolymers of tetrafluoroethylene and ethylene (ETFE),
polymers of trifluorochloroethylene and ethylene (E-CTFE) and blends thereof.
4. The plate according to one of points 1 to 3, in which the
fluoropolymer is the copolymer of tetrafluoroethylene and hexafluoropropylene
(FEP).
5. The plate according to one of points 1 to 4, of which the total
thickness lies between 1 and 20 mm, preferably 2 to 5 mm.
6. The plate according to one of points 1 to 5, in which the sheet of
carbon fibers is in the form of a woven or nonwoven sheet, preferably in the form of
a sheet of crossed carbon fibers.

7. The plate according to one of points 1 to 6, in which the sheet of
carbon fibers has a thickness of between 0.1 and 10 mm, preferably 0.5 to 3 mm.
8. The plate according to one of points 1 to 7 comprising:
a layer of fluoropolymer on one of the faces of the plate,
- a layer of carbon fibers free from fluoropolymer on the other face of the
plate, and
a central layer consisting of carbon fibers impregnated with fluoropolymer.
9. The use of the plate according to one of points 1 to 8 for the
production of floating linings for reactors, tanks and pipework intended to be in
contact with acidic and/or superacidic corrosive media.
10. A floating lining comprising a plurality of plates according to one of
points 1 to 8, said plates being butt-welded together.
11. A reactor comprising:
an inner metal wall, and
a floating lining according to point 10, situated on all or part of the inner
wall of the reactor, the face of the lining comprising carbon fibers free from
fluoropolymer being positioned against the inner metal wall of the reactor.
12. The reactor according to point 11, additionally comprising:
a plurality of orifices in the inner wall, connected to a network of pipes;
a pressure-regulating device connected to the network of pipes maintaining the
pressure inside the space between the fluoropolymer layer and the lower inner wall at
the pressure existing inside the reactor.
13. A reactor comprising an inner wall, comprising one or more plates
according to one of points 1 to 8, reinforced with a layer made of composite material
and carbon fibers.
14. The reactor according to point 13 comprising, around the inner wall,
an additional, noncontiguous outer metal jacket.
15. A method for producing the plates according to one of points 1 to 8
comprising:
- bringing the sheet of carbon fibers into contact with the fluoropolymer;
melting one face of the fluoropolymer plate; and
pressing the polymer until cool.
16. The production method according to point 15, wherein:
one face of the fluoropolymer plate is brought into contact and melted by
extruding said fluoropolymer onto the sheet of fibers.
17. A method for producing a floating lining according to point 10,
comprising:
providing at least one plate according to one of points 1 to 8;

- cutting out and forming this plate inside a metal reactor, the face covered
with carbon fiber fabric being in contact with the metal wall of the reactor;
where appropriate, butt-welding the cut-outs of said at least one plate.
18. A method for producing a reactor according to point 13, comprising:
- providing at least one plate according to one of points 1 to 8;
- cutting out and forming this plate on a former, the face made of
fluoropolymer being in contact with the former;
- where appropriate, butt-welding the cut-outs of said at least one plate;
applying at least one layer of composite material and a sheet of carbon
fibers to said free face and then polymerizing the composite material.

19. A fluorination method in the liquid phase, in which said reaction is
performed in a reactor according to one of points 11 to 14.
20. The fluorination method according to point 20, in which the
temperature lies between 60 and 150°C.
Detailed description of the invention
The thickness of the final reinforced fluoropolymer plate may be 1 to 20 mm
and preferably 2 to 5 mm.
The fluoropolymers (FP) used in the invention are thermoplastic polymers that
are resistant to acidic media, chosen in particular from the group consisting of
polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), copolymers
of tetrafluoroethylene and perfluoropropene (FEP), copolymers of
tetrafluoroethylene and perfluoro-propylvinylether (PFA), copolymers of
tetrafluoroethylene and ethylene (ETFE), polymers of trifluorochloroethylene and
ethylene (E-CTFE) and mixtures thereof.
Preferably, the fluoropolymer used is the copolymer of tetrafluoroethylene and
hexafluoropropylene (FEP) for its properties of not allowing antimony (Sb) to diffuse
into the polymer. The FEP used has 10 to 15% and preferably 12% by weight of
hexafluoropropylene.
The FP layer ensures the chemical resistance of the plate once formed and
enables the metal of the reactor to be protected from corrosion by virtue of its
imperviousness through its barrier action.
The carbon fibers are used in the form of sheets of fibers (or fabric), that are in
particular woven or nonwoven, identical to those normally used in the carbon fiber
composite materials industry (automotive, ski, boats).
The carbon fibers used are in woven form or in the form of windings according
to conventional production techniques for producing carbon fiber composites.
Sheets of crossed carbon fibers are preferably used.

The thickness of the sheet of carbon fibers may lie between 0.1 and 10 mm,
preferably 0.5 and 3 mm. The chosen thickness depends on the ultimate type of
application for the reinforced plate.
The sheet of carbon fibers increases the mechanical strength of the FP layer
and in particular its hot creep resistance.
It enables the composite material to be subsequently attached to the layer of
carbon fibers free from FP, particularly in the case of a reactor of composite
construction as described further on.
The method for producing reinforced plates may comprise bringing carbon
fibers into contact with the fluoropolymer; melting one face of the fluoropolymer
plate; applying carbon fibers to the molten polymer face; and pressing until the
polymer is cool.
The sheet of carbon fibers is bonded to one face of the FP plate by melting the
FP in contact with the sheet and by penetration of the molten FP through at least part
of the thickness of the sheet.
According to a preferred embodiment, the reinforced fluoropolymer comprises:
a layer of fluoropolymer on one face of the plate;
a layer of carbon fibers free of fluoropolymer on the other face of the plate;
a central layer consisting of carbon fibers impregnated with fluoropolymer.
Processing may be carried out by heating one face of the FP plate until a
surface FP layer is melted followed by application of the sheet and pressing under
high pressure until the FP is cool.
Techniques for coextruding FP and the sheet may also advantageously be
employed during the production of the FP plate.
Impregnation of the sheet of carbon fibers by molten FP may be carried out at
least partially.
The impregnation thickness (degree of impregnation) is at least 10%,
preferably 10 to 90% of the thickness of the carbon fiber sheet or fabric and
advantageously 30 to 70%.
On account of partial impregnation, the non-impregnated part of the sheet of
carbon fibers may, by virtue of its porosity, act as a free space (for gases) between
the inner metal wall of the reactor and the impervious FP layer, in particular in the
case of a reactor covered with a liner as described further on.
Thus, the degree of impregnation as defined above is sufficient to ensure that
the sheet is firmly attached to the FP, so as to ensure the mechanical reinforcement of
the FP plate, of which the mechanical properties when hot are too low, and finally to
ensure the dimensional stability of the FP plate as the polymer expands under the
action of temperature.

Once formed, the reinforced plates can serve in the production of a floating
lining (called a liner) of the reactor.
This liner is made with one or more FP plates reinforced with carbon fibers on
one face. When the liner is made with several plates, these are butt-welded.
Using FEP, a particularly impervious lining is obtained acting as an obstacle in
particular to the diffusion of antimony. FEP also has the advantage of being easy to
weld at low temperature.
In the liner according to the invention, the sheet of carbon fibers is very firmly
bonded to the FP plate (extrusion of FP through one face of the sheet of carbon
fibers). This reinforcement made of carbon fibers ensures the dimensional stability of
the FP plate forming the liner, expansion of the FP only occurring on the thickness of
the plate. Creep is avoided in this way as well as the formation of folds when the
reaction mixture is heated in the reactor.
The liner (or floating lining) is applied to the inside of the reactor or only on
the part of the reactor in contact with the corrosive medium (liquid phase), and
advantageously the liner is only applied to the vessel of the reactor.
The porous layer made of carbon fibers on the outer face of the FP plate creates
a space that is permeable to gases. This porous layer improves the distribution of
pressure between the metal wall of the reactor and the liner and in this way prevents
the formation of gas pockets resulting from the diffusion of reactants through the
fluoropolymer barrier layer.
This space makes it possible to collect gaseous HF which may diffuse very
slightly through the FP under the action of high pressures from the fluorination
reaction (10 to 15 bar).
This space created by the porous layer also makes it possible for the gas to
circulate to the orifices drilled in the metal wall of the reactor, when such orifices are
present.
These orifices are connected to a network of pipes for regulating, where
necessary, the pressure existing in this space and for always maintaining it less than
that existing in the reactor. The liner is thus always held strongly pressed against the
wall of the reactor under the effect of pressure without the use of adhesives which do
not withstand the diffusion of HF. It is moreover easier to dismantle.
To this end, the reactor may include a device for maintaining the pressure
lower than the pressure of the reactor in the space included between the inner metal
wall of the reactor and the outer wall of the FP of the liner reinforced with carbon
fibers.
The pipes terminate in a tank of which the pressure is maintained at a value
that is always below that of the reactor by means of a vacuum pump (atmospheric

pressure reactor) or else by injecting an inert gas. This pressure difference may be
from 0.1 to 15 bar and preferably 0.5 to 2 bar.
The diameter of the orifices may be 1 to 20 mm and a mesh may be placed on
the side of the orifice in contact with the liner. The diameter of this mesh is
advantageously greater than that of the orifice.
The number of orifices drilled in the wall of the reactor depends on the
diameter of these orifices and on the thickness of the sheet of carbon fibers that is not
impregnated with FP. It may be from 1 to 20 per m of wall and preferably 2 to 5 per
m2.
The presence of this porous layer also makes it possible to reduce the number
of holes necessary for evacuating gases without reducing the effectiveness with
which the liner is attached to the metal wall of the reactor under the action of the
internal pressure of the reactor.
Reactors covered with a liner such as described above are capable of
withstanding reaction conditions in a superacidic medium, in particular fluorination
reactions in the liquid phase, such as temperatures ranging from 0 to 150°C and
preferably 60 to 120°C, and a pressure of 1 to 15 bar absolute.
According to another feature, the invention relates to a reactor (called a
composite reactor) of which the wall has an inner layer of fluoropolymer, a central
layer consisting of carbon fibers impregnated with fluoropolymer and a layer of
carbon fibers free from fluoropolymer and impregnated with composite material
(called a composite layer made of carbon fibers).
The composite material used is preferably a resin chosen from resins that are
compatible with (super) acidic media, and in particular HF. Use may be made in
particular of phenylene sulfide (PPS) and polyetheretherketone (PEEK).
The carbon fibers are in the form of sheets or fabrics or yarn.
This composite layer made of carbon fibers ensures in particular the
mechanical strength of the reactor, tank or pipework elements.
Its thickness is calculated according to the stresses, in particular the pressure
under, which the reactor is used. Its thickness may extend from a few millimeters to
several centimeters.
In this embodiment, the bonding of the actual layers are as follows:
the composite layer is bonded to the sheet of carbon fibers (central layer) by
resin in the region of the face of the sheet free from FP;
the central layer of the sheet of carbon fibers is bonded to the FP layer by
melting the FP in contact with this sheet and by penetration of the molten FP through
part of the sheet of carbon fibers.

The coating of the sheet of carbon fibers with FP is only partial so that the
surface of the sheet of carbon fibers in contact with the composite layer is not
covered with FP and so that the composite can be bonded onto the sheet by resin.
These composite reactors can be produced according to the method in which:
in a first step, FP plates are produced reinforced by a sheet of carbon fibers
with one face of the sheet free from FP;
the central layer of the sheet of carbon fibers is bonded to the FP layer by
melting the FP in contact with this sheet and by penetration of the molten FP through
part of the sheet of carbon fibers. The thickness of this FP plate is preferably 2 to 5
mm and that of the sheet of carbon fibers 0.5 to 3 mm;
as previously, the sheet of carbon fibers is attached to the FP at the moment the
plate is extruded and the sheet is covered by molten FP over part of its thickness;
in a second step, one or more of these plates are then cut up and applied to a
former having the internal dimensions of the reactor, with the FP face against the
former and then, as the case may be, butt-welded together by a hot gas jet;
in a third step, the layer of composite is then put into place by successively
applying composite material and carbon fibers around the former covered with
reinforced FP plates;
then, after drying and curing, the inner former is taken away so as to disengage
the inner wall of the composite reactor.
The composite reactor according to the invention makes it possible to limit, or
even eliminate, the problems of differential expansion between the polymer and the
metal, in this way preventing the lining from being detached and pulled off.
According to a particular embodiment, when reactors, tanks or pipework are
used under high pressures, an additional metal jacket, for example one made of steel,
may be added around the composite reactor.
This jacket is not contiguous, a space of several centimeters being provided so
as to enable the composite reactor to expand. The steel jacket is dimensioned so as
to withstand the pressure of the reactor in the case of leakage or of a breakage of the
composite reactor.
A device for detecting leakage may be added so as to detect the presence of
chemical in the free space between the composite reactor and the metal chamber.
When FEP is used as the fluoropolymer in the production of reinforced plates,
its main drawbacks, that is to say softening and excessive expansion when hot, are
overcome.
Thus, the use of FEP makes it possible to produce a lining for the reactor (or
for the tank or indeed for the pipework) that is effective particularly for performing
the fluorination of chloroalkanes in the liquid phase, under pressure and hot.

Reactors produced in this way with reinforced plates according to the invention
are capable of withstanding reaction conditions in a superacidic medium, in
particular fluorination reactions in the liquid phase, such as temperatures ranging
from 0 to 150°C and preferably 60 to 120°C and a pressure of 1 to 15 bar absolute.
The plates according to the invention can be used for the production of floating
linings (liners) of metal reactors or indeed for producing reactors, tanks or pipework
made of composite material used for the reaction, storage or transport of corrosive
acidic products, in particular mixtures of hydrofluoric acid and antimony halide.
The conditions under which the reactors, tanks or pipework are used comprise
temperatures from 0 to 150°C and pressures of 0 to 15 bar.
Examples
The following examples illustrate the present invention without limiting it.
Example 1
Preparation of reinforced fluoropolymer plates
FEP plates were produced covered on one face with a carbon fiber fabric (sheet
of woven carbon fibers).
The thickness of the FEP plate was 3 mm and that of the carbon fabric 1 mm.
The carbon fabric was attached to the FEP plate at the moment the FEP was
extruded and the fabric was covered by molten FEP over approximately half its
thickness.
The total thickness of the plate was 3.3 mm.
Example 2
Preparation of a floatinfi lining (liner).
The plates prepared in example 1, approximately 3 m2 in size, were cut up and
applied to the inside of the chamber of the reactor, the face covered with the carbon
fiber fabric being against the metal wall. The cut plates were butt-welded together
by a hot gas jet so as to form a continuous impervious lining over all the inner
surface of the chamber of the reactor, including that part of the chamber in contact
with the seal of the reactor lid.
The plates were cut out so that the welds of the plates were preferably situated
on surfaces with a large radius of curvature.
Example 3
Preparation of the composite reactor
The plates prepared in example 1, approximately 3 m in size, were cut up and
applied to a former having the internal dimensions of the reactor, with the FEP face
against the former, and then butt-welded together by a hot gas jet.
The composite layer was then put in place by successive applications of resin
and carbon fiber fabric around the former.

After drying and polymerization, the inner former was removed.
Example 4
Resistance tests in a superacidic medium of a plate prepared according to example 1
An FEP sample plate covered with carbon fiber fabric, 2 cm x 2 cm x 3.3 mm
in size, was placed for 400 h in a reactor used for fluorination reactions in the liquid
phase under the following conditions:
Temperature: 80 to 110°C
Pressure: 10 to 13 bar
Fluorination medium: a mixture of anhydrous HF and SbCl5
Reactants subjected to fluorination: trichloroethylene, dichloromethane and
trichloroethane.
Following these tests, no deterioration was observed in the sample, nor any
detachment of the layer of carbon fibers, nor any loss of weight.

WE CLAIM:
1. A reinforced fluoropolymer plate comprising
—a layer of fluoropolymer on one of the faces of the plate
— a layer of carbon fibers free from fluoropolymer on the other face of the plate, and
- a central layer consisting of carbon fibers impregnated with fluoropolymer
at least part of the sheet of carbon fibers being impregnated with fluoropolymer.
2. The plate as claimed in claim 1. in which the polymer-impregnated thickness
represents at least 10% of the thickness of the sheet of carbon fibers, preferably 10% to 90%.
advantageously 30 to 70%.
3. The plate as claimed in claim 1 or 2, in which the fluoropolymer is chosen from the
group consisting of polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF),
copolymers of tetrafluoroethylene and perfluoropropene (FEP). copolymers of tetrafluoroethylene
and perfluoro-propylvinylether (PFA), copolymers of tetrafluoroethylene and ethylene (ETFE),
polymers of trifluorochloroethylene and ethylene (E-CTFE) and blends thereof.
4. The plate as claimed in one of claims 1 to 3, in which the fluoropolymer is the
copolymer of tetrafluoroethylene and hexafluoropropylene (FEP).
5. The plate as claimed in one of claims 1 to 4, of which the total thickness lies between
1 and 20 mm, preferably 2 to 5 mm.
6. The plate as claimed in one of claims 1 to 5, in which the sheet of carbon fibers is in
the form of a woven or nonwoven sheet, preferably in the form of a sheet of crossed carbon fibers.
7. The plate as claimed in one of claims 1 to 6, in which the sheet of carbon fibers has a
thickness of between 0.1 and 10 mm. preferably 0.5 to 3 mm.
8. A floating lining comprising a plurality of plates as claimed in one of claims 1 to 7,
said plates being butt-welded together.
9. A reactor comprising:
an inner metal wall, and
a floating lining as claimed in claim 8, situated on all or part of the inner wall of the
reactor, the face of the lining comprising carbon fibers free from fluoropolymer being positioned
against the inner metal wall of the reactor.
10. The reactor as claimed in claim 9, additionally comprising:

a plurality of orifices in the inner wall connected to a network of pipes;
a pressure-regulating device connected to the network of pipes maintaining the pressure
inside the space between the fluoropolymer layer and the lower inner wall at the pressure existing
inside the reactor.
11. A reactor comprising an inner wall, comprising one or more plates as claimed in one
of claims 1 to 7, reinforced with a layer made of composite resin material and carbon fibers.
12. The reactor as claimed in claim 11 comprising, around the inner wall, an additional,
noncontiguous outer metal jacket
13. A method for producing the plates as claimed in one of claims 1 to 7 comprising:
- bringing the sheet of carbon fibers into contact with the fluoropolymer,
- melting one face of the fluoropolymer plate;
- applying carbon fibers to the molten polymer face; and
- pressing the polymer until cool.
14. The production method as claimed in claim 13, wherein:
- one face of the fluoropolymer plate is brought into contact and melted by extruding said
fluoropolymer onto the sheet of fibers.
15. A method for producing a reactor as claimed in any one of claims 9 or 10, provided
with a floating lining as claimed in claim 8, comprising:
- providing at least one reinforced fluoropolymer plate as claimed in any one of claims 1 to 7 and
produced as claimed in the method of claims 13 or 14;
- cutting out and forming this plate inside a metal reactor, the face covered with carbon fier fabric
being in contact with the metal wall of the reactor,
- where appropriate, butt welding the cut outs of said at least one plate.
16. A method for producing a reactor as claimed in claim 11, comprising:
- providing at least one reinforced fluoropolymer plate as claimed in claims 1 to 7 and produced
according to the method of claims 13 or 14;
- cutting out and forming this plate on a former, the face made of fluoropolymer being in contact
with the former,
- where appropriate, butt welding the cut outs of said at least one plate;
- applying at least one layer of composite material and carbon fibers to said free face, then
polymerizing the composite material.


The invention relates to a reinforced fluoropolymer plate comprising:
- a layer of fluoropolymer on one of its faces,
- a layer of carbon fibers free from fluoropolymer on the other face, and
- a central layer consisting of carbon fibers impregnated with fluoropolymer,
whereby, at least part of the sheet of carbon fibers, are impregnated with fluoropolymer, and
the preparation thereof.
The invention also relates to an acid-corrosion-resistant reactor comprising said plates and
the producti on methods of said reactors.

Documents:

01670-kolnp-2006 abstract.pdf

01670-kolnp-2006 claims.pdf

01670-kolnp-2006 correspondence others-1.1.pdf

01670-kolnp-2006 correspondence others.pdf

01670-kolnp-2006 description(complete).pdf

01670-kolnp-2006 form-1.pdf

01670-kolnp-2006 form-3-1.1.pdf

01670-kolnp-2006 form-3.pdf

01670-kolnp-2006 form-5.pdf

01670-kolnp-2006 g.p.a.pdf

01670-kolnp-2006 international publication.pdf

01670-kolnp-2006 international search authority report.pdf

01670-kolnp-2006 pct form.pdf

01670-kolnp-2006 priority document.pdf

01670-kolnp-2006-correspondence-1.2.pdf

01670-kolnp-2006-form-18.pdf

1670-KOLNP-2006-ABSTRACT 1.1.pdf

1670-KOLNP-2006-ABSTRACT 1.2.pdf

1670-KOLNP-2006-AMANDED CLAIMS.pdf

1670-kolnp-2006-assignment.pdf

1670-KOLNP-2006-CANCELLED PAGES.pdf

1670-KOLNP-2006-CLAIMS 1.1.pdf

1670-KOLNP-2006-CORRESPONDENCE 1.1.pdf

1670-KOLNP-2006-CORRESPONDENCE 1.2.pdf

1670-kolnp-2006-correspondence1.2.pdf

1670-KOLNP-2006-DESCRIPTION (COMPLETE) 1.1.pdf

1670-kolnp-2006-examination report.pdf

1670-kolnp-2006-form 1-1.3.pdf

1670-KOLNP-2006-FORM 1.1.1.pdf

1670-KOLNP-2006-FORM 1.1.2.pdf

1670-kolnp-2006-form 13.1.pdf

1670-KOLNP-2006-FORM 13.pdf

1670-kolnp-2006-form 18.pdf

1670-kolnp-2006-form 2.pdf

1670-KOLNP-2006-FORM 3.1.1.pdf

1670-KOLNP-2006-FORM 3.1.2.pdf

1670-kolnp-2006-form 3.pdf

1670-kolnp-2006-form 5.pdf

1670-kolnp-2006-gpa.pdf

1670-kolnp-2006-granted-abstract.pdf

1670-kolnp-2006-granted-claims.pdf

1670-kolnp-2006-granted-description (complete).pdf

1670-kolnp-2006-granted-form 1.pdf

1670-kolnp-2006-granted-form 2.pdf

1670-kolnp-2006-granted-specification.pdf

1670-KOLNP-2006-OTHERS 1.1.pdf

1670-KOLNP-2006-OTHERS.pdf

1670-kolnp-2006-others1.2.pdf

1670-KOLNP-2006-PETITION UNDER RULE 137.pdf

1670-KOLNP-2006-REPLY TO EXAMINATION REPORT.pdf

1670-kolnp-2006-reply to examination report1.1.pdf

1670-kolnp-2006-specification.pdf


Patent Number 248898
Indian Patent Application Number 1670/KOLNP/2006
PG Journal Number 36/2011
Publication Date 09-Sep-2011
Grant Date 07-Sep-2011
Date of Filing 15-Jun-2006
Name of Patentee ARKEMA
Applicant Address 4/8, COURS MICHELET, 92800 PUTEAUX
Inventors:
# Inventor's Name Inventor's Address
1 DEVIC, MICHEL 22 RUE GEORGES CLEMENCEAU, 69110 SAINTE-FOY-LES-LYON
2 LACROIX, ERIC 1107 ROUTE D'ANSE, 69480 AMBERIEUX D'AZERGUES
3 PERDRIEUX, SYLVAIN 707 RUE LA MACONNIERE, 69390 CHARLY
4 BONNET, PHILIPPE 12 RUE CAPITAINE ROBERT CLUZAN, 69007 LYON
PCT International Classification Number C08J 5/18
PCT International Application Number PCT/FR2004/003169
PCT International Filing date 2004-12-09
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 03 15 624 2003-12-31 France