Title of Invention

A TIE LAYER

Abstract The present invention relates to a tie layer comprising 5 to 50% by weight of a blend (A) the said blend (A) comprising 5 to 100% of a blend of polymers (Cl) and C2), consisting of90 to 20% by weight of a metallocene polyethylene (Cl) of sensity between 0.865 and 0.915 and of 10 to 80% by weight of a polymer (C2) which is either a non-metallocene LLDPE or a polypropylene homopolymer or copolymer, the blend of polymer (Cl) and (C2) being cografted by an unsaturated carboxylic acid or a functional derivative of this acid as grafting monomer, 95 to 0% by weight of polyethylene (D) chosen from polyethylene homopolymers or copolymers and elastomers; the blend (A) being such that; the content of grafting monomer grafted is between 30 and 105 ppm; the MFI or meltflow index (ASTM D 1238, at 190°C/2.16 kg) is between 0.1 and 30 g/10 min; 50 to 95% by weight of a polypropylene homopolymer or copolymer (B).
Full Text

DESCRIPTION METALLIZED MULTILAYER FILM
The present invention relates to the field of packaging using, in particular, traxiaily oriented or unoriented multilayer films rnetaliized and laminated with a baxiaiiy oriented polypropylene (BOPP) film or biaxially oriented polyethylene terephthala-e (BOPET) film, which is printed or not printed, exhibiting very good adhesion of the layers to each other even when the films are weakened by a weld, ""he invention applies inter alia to packages of a sachet, bag, pouch or packet type, produced from these welded films, the composition of which allows the package to be correctly opened manually. Non-limiting mention may be made, for example, of packets of crisps, biscuits, sweets or meat.
Docirnent WO 01/34389 discloses a package using a multilayer film having oxygei and water-vapour barrier properties, but this package has the drawback ,vhen it is desired to ooen it of not opening cleanly. This is because there is :ielamination between the metal layer and the polypropylene layer on which the metal layer is deposited.
tt is important in the field of packaging to nave packages that open cleanly h exeiing a moderate force, so that they can be opened both by an adult and by a :;hild. In addition, it is necessary for the films making up the packages to have oxygen and water-vapour barrier properties so as to preserve the foodstuffs, /./hethar solid or liquid, edible or otherwise, laying inside the package.
The Applicant has now found a film that exhibits strong adhesion between a metal layer and a layer having a composition based (i) predominantly on polypropylene and (ii) to a minor extent on a biend either of cografted :;olyetiylenes (abbreviated to g-PE) or of cografted polyethylene and polypropylene, and (iii) optionaliy of ungrafted polyethylene or elastomer. This film makes it possible inter alia to manufacture packages closed by a band of welding :if the said film, the opening taking place within this same band. Unlike the prior hat, there is no preferential delamination or peeling between the metal and PP i ayers to the detriment of the opening of the package within the welding band. This is because the package according to the invention opens cleanly within the welding b;;nd .without there being any damage to the multilayer structure ijlsewhere.

The subject of the invention is a tie layer comprising: - 5 to .'50% by weight of a blend (A), the said blend (A) comprising:
■ 6 to 100% of a blend of polymers (C1) and (C2), consisting of 90 to 20% by weight of a metallocene polyethylene (C1) of density between 0.865 and j.915 and of 10 to 30% by weight of a polymer (C2) which is either a non-TetallocenEj LLDPE or a polypropylene homopoiymer or copolymer, the blend of polymers (01) and (C2) being cografted by an unsaturated carooxylic acid or a functional derivative of this acid as grafting monomer, and
■• 95 to 0% by weight of a polyethylene (D) chosen from polyethylene homopolymers or copolymers and elastomers; the blEsnc (A)being such that:
• the content of grafting monomer grafted is between 30 and 105ppm;
• the MFI or melt-flow index (ASTM D 1238, at 190X/2.16 kg) Is between 0.1 and 30 g/10 min;
- 30 to 95% by weight of a polypropylene homopoiymer or copolymer
(B).
The invention else relates to a multilayer 'structure comprising a tie layer as refined above.
According to one embodiment, the multilayer structure comprises a metal 3yer bonded to the tie layer.
9
According to one embodiment, the structure is precharacterized in that the r.etal layer is a layer of Al, Fe, Cu, Sn, Ni, Ag, Cr or Au or an alloy containing ;fedominar% at least one of these metals.
According to one embodiment, the multilayer structure is characterized in rhat it comprises a polypropylene homopoiymer or copolymer !ayer (3), the tie ^yer (2) being sandwiched between the metal layer (1) and the said polypropylene ^yer (3).
According to one embodiment, the multilayer is characterized in that it comprises a layer suitable for heat-sealing and comprising either an c'thyleie/propylene/butylene terpolymer, or an ethylene/propylene copolymer, or a metallocene i"E or blends thereof, and in this case the said blend comprises at

4
ioast two -of the abovementioned compounds, the polypropylene layer being sandwiched between the tie layer and the said layer suitable for heat-sealing.
The invention also relates to a film comprising a multilayer structure as defined above.
According to one embodiment, the film is characterized in that it comprises ;?. printed biaxially oriented polypropylene (BOPP) or biaxially oriented polyethylene terephthalate (BOPET) layer to which a metallized multilayer film having a structure as described above is applied by means of an adhesive, the said film being biaxially oriented or not and the metal layer of the said metallized nultilayer film being directly bonded by the adhesive to the printed BOPP or BOPET layer.
The invention also relates to the use of a tie for manufacturing a multilayer structure a55 defined above,
The invention also relates to an article- having a multilayer structure as c escribed above.
According to one embodiment, the article is manufactured with a film as i; escribed above.
According to one embodiment, the article is a package.
Figura 1 snows one embodiment of a film according to the Invention, the said metallized cast polypropylene (MCPP) film having a structure with layers 1 to ■-.■ corrvng one after another in the following order: a layer (1) of metal, a layer (2) of .•:; blend of cografted PE and LLDPE, of LL.DPE and of PP homopolymer or copolymer, e layer (3) of PP homopolymer or copolymer and a layer (4) of polymer suitable for heat sealing.
Figure 2 shows in cross section a bag (6) closed by a welding band (6a), •according to the abovementioned prior art, after a failed attempt at opening it, the said bag beinc produced using a film having the following structure: a layer (11) of •natal, a layer (12) of a blend of syndiotactic PP and of a butyiene/propylene copolymer or of a blend of syndiotactic PP and of grafted PP homopolymer or copolymer, a layer (13) of PP homopolymer or copolymer, and a layer (14) of

athylene/propylene/butylene terpolymer or ethyiene/propyiene copolymer or -netallocen© PE.
Figure 3 shows in cross section a bag according to the invention after it has :>een opened within the welding band, the opening being defined by the edges [5b) and the bag (6) being produced using the fiim having a multilayer structure ! layers; 1-4) shown in Figure 1.
We will now describe the invention in further detaii. The packages - the articles of the invention - comprise a film made of metallized cast PP (MCPP for :hort}. This; film may form part of a structure of the type: BOPP or BOPET layer/ ik layer/adhesive layer/ MCPP film.
The VICPP film has a multilayer structure shown in Fig, 1 and having the blowing form' layer (1)/layer (2)/layer (3)/layer (4), the composition of which will je given below.
Within an MCPP film there are therefore the following layers, coming one .lifter smother ^n the order: BOPP or BOPET layer/ink layer/adhesive tayer/iayer ;1 )/laysr (2)/!ayer (3)/layer (4).
The layer (1) is a metal layer applied to a layer (2). It may. for example, be a ::il or film ct a metal such as Al, Fe, Cu, Sn, Ni, Ag, Cr, Au or an alloy containing predominantly at least one of these metals.
The ayer (3) is a PP layer. The polypropylene of the layer (3) may be a -lomopolymer or a copolymer.
As comonomers, mention may be made of:
• a-olefins, advantageously those having from 2 to 30 carbon atoms, •uch as ethylene, 1-butene, 1-pentene. 3-methyl-1-butane. 1-hexene, ■i-rnethyl-1-psntene, 3-methyi-l-pentene, 1-octene, 1-decene, 1-dodecene, ' -tetradeceis, 1-hexadecene, 1-octadecene, 1-eicocene. 1-dococene, i-tetracocene, 1-hexacocene, 1-octacocene and 1-triacontene. These a-olefins •nay bs used by themselves or as a blend of two or more of them;
• dienes.
"tie polypropylene may also be a polypropylene block copolymer.

Advantageously, the layer (3) comprises a blend of several polymers, in which there is at least one polypropylene comprising at least 50 mol% and preferably &i least 75 mol% of propylene. As an example, the polypropylene of the syer (3) may be a polypropylene/EPDM or poiypropylene/EPR blend.
As PP homopolymer, mention may be made of between 80 and 100%, preferably 95% isotactic PP. The polypropylene homopolymer preferably has an MFI (nelt flow index) of between 1.2 and 30 g/10 min, preferably between 3 and :i g/10 min, measured according to ASTM D1238.
The layer (4) is a layer suitable for heat sealing. It may comprise, for rxampie, an ethylene/propylene/butylene terpolymer, an ethylene/propyiene copolymer, a metaliocene PE or blends, thereof (blend of at least two of the -:bovementioned compounds). Advantageously, the layer (4) comprises' a ■".arpofymer comprising predominantly propylene as comonomer.
The layer (2) is produced using a blend comprising:
- 5 to 50%, preferably 20 to 40%, by weight of a blend of (A); and
- 50 to 95%, preferably 60 to 80%, by weight of a polymer (3).
With regard to the blend (A) defined by a blend (C) optionally blended with a : olymer (D), this comprises:
- 5 to 100% by weight (with respect to the biend (A)) of the blend (C), which 'self consists of a blend of 80 to 20% by weight (with respect to the blend (C)) of a -iietailocens* polyethylene (C1) of density between 0.865 and 0.915 and of 20 to i;0% cy weight (with respect to the blend (C)) of a non-metallocene LLDPE (C2), ;ie blend of poiymers (C1) and (C2) being cografted by an unsaturated carboxylic :;cid or a functional derivative of this acid as grafting monomer; and
- 95 to 0% by weight (with respect to blend (A)) of a polyethylene (D) chosen ■:rorn polyethylene homopolymers or copolymers and elastomers,
:ie biend (A) being such that:
- the content of grafting monomer grafted is between 30 and 105 ppm ;
- the MFI or meltflow index (ASTM D 1238, at 19Q°C/2.16 kg is between 0.1
■ind30g/1C min;
With regard to polymer (C1), "metaliocene polyethylene" should be ■.understood to mean polymers obtained by the copolymerization of ethylene with jn a-olefin such as, for example, propylene, butene, hexene or octene in the

presence o,: a monosite catalyst generally consisting of an atom of a metal, which may for example be zirconium or titanium, and of two alkyl cyclic molecules linked •: the metal. More specifically, the metallocene catalysts are usually composed of two cyclopentadiene rings linked to the metal. These catalysts are frequently used with s.luminoxanes as cocatalysts or activators, preferably methylaluminoxane (MAO}. HatniLim may also be used as the metal to which the cyclopentadiene is attached. Other metallocenes may include transition metals of Groups IVA, VA and VIA. Metals of the lanthanide series may also be used.
These metallocene polyethylenes may also be characterized by their MJMn ratio (MFR - 4.63). MFR denotes the ratio of the MR10 (MFI „ntier a load of 10 kg) to the MFI2 (MFI under a load of 2.16 kg). Other 'netallocenF» poly ethylenes are defined by an MFR equal to or greater than 6.13 ;ind an Mw'Mn ratio less than or equal to (MFR -4.63).
.Advantageously, the density of (C1) is between 0.370 et 0.900.
With ii'yard to polymer (C2), this is either an ethylene/a-o(efin copolymer of :ne L.LDPFi (linear low-density polyethylene type) which is not of metallocene :rigin. or a polypropylene homopolymer or copolymer with, as comonomers, for •/ample a olefins or dienes. The polymer (C2) may also be a polyprpylene block copolymer.
The o-oiefins advantageously have 3 to 30 carbon atoms.
Eixampie-s of a-clefins having 3 to 30 carbon atoms comprise ethylene (only
-.:omonomers of the PP), propylene (only comonomer of the PE), 1-butene,
"-pentene, 3-methyM-butene, 1-hexene, 4-methykl-pentene,
:-methyl-l-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, '.-hex«dec»3nef 1-octadecene, 1-eicocene. 1~dococene, 1-tetracocene, '••nexacocene, 1-octacocer.e and 1-triacontene. These a-olefins may be used by :hems3lves or as a blend of two or more of them.
The density of (C2) is advantageously between 0.900 and 0.950. The MFI of :C2) is between 0.1 and 8g/10 min (at 190°C/2,18 kg).

The (CI >'(C2) blend is grafted by a grafting monomer taken from the group of unsaturated carboxylic acids or their functional derivatives. Examples of unsaturated carboxylic acids are those having 2 to 20 carbon atoms, such as Eicrylic, methacryiic, maleic, fumaric and itaconic acids. The functional derivatives :>f these tscicls comprise, for example, anhydrides, ester derivatives, amide derivatives, imide derivatives and metal salts (such as alkali metal salts) of .unsaturated carboxylic acids.
Unssiturated dicarboxylic adds having 4 to 10 carbon atoms and their ■■unctional derivatives, particularly their anhydrides, are particularly preferred grafting monomers.
Thesie grafting monomers comprise, for example, maieic, fumaric, itaconic,
: itraccnic, ailylsuccinic, cycle hex-4-ene-1,2-dicarboxylic, 4-methylcyclohex-4-ene-
1,2-dicarbcxylic, bicydo[2.2.1]hept-5-ene-2,3-dicarboxylic and x-
'iethybicyc!o[2.2.1]hept-5-ene-2,2-dicarboxy!ic acids and maleic, itaconic, dtraccnic, ailylsuccinic, cydohex-4-ene-1,2-dicarboxylic, 4-methylenecyclohex-4--;,ne-1,2-dicarboxylic, bicyclo-[2.2,1]hept-5-ene-2,3-dicarboxylic and x-methyl-;;icyclo[2.2. r|hept-5-ene-2,2-dicarboxylic anhydrides.
Examples of other grafting monomers comprise:
• Ci-C8 alky] esters or glycidyl ester derivatives of unsaturated :arboxy!ic acids, such as methyl acrylate, methyl rnethacrylate, ethyl acrylate, -- thy! methacrylate, butyl acrylate, butyl rnethacrylate, glycidyl acrylate, giycidy! •■lethacr/late, monoethyl maleate, diethyl maleate, monoethyl fumarate, dimethyl "jmarate, monomethyl itaconate and diethyl Itaconate;
• amide derivatives of unsaturated carboxylic acids, such as ■Eicrylamide, rne-thacrylamide.'the monoamide of maleic acid, the ciiamide of maieic •:cid, the N-monoethyiamide of maleic acid, the N,N-diethyiamide of maleic acid, :ie N-monobutylamide of maleic acid, the N.N-dibutylamide of maleic acid, the nonoamide of fumaric acid, the diamide of fumaric acid, the N-mono-ethylamide of ;;maric acid, the N,N-diethylamide of fumaric acid, the N-monobutylamide of "jmaris acid and the N.N-dibutylarnide of fumaric acid;
• smide derivatives of unsaturated carboxylic acids, such as maleimide, T-butyimaieimide, N-phenylmaleimide; and
• metal salts of unsaturated carboxylic acids, such as sodium acrylate, sodium rnethacrylate, potassium acrylate and potassium rnethacrylate.
Maleic anhydride is preferred.

Various known processes may be used to graft a grafting monomer onto the .--lend of (CI j and (C2).
The amount of grafting monomer is chosen in an appropriate manner, and i:3 between 0 01 and 10%, preferably between 600 ppm and 5000 ppm with inspect to the weight of grafted (CI) and (C2). The amount of grafted monomer is determined by assaying the succinic functional groups by FTIR spectroscopy. The MFI of'(C), that is to say of (C1) and (C2) which have been cografted, is 0.1 to lOg/IOmin.
With regard to polyethylene (D), this is a polyethylene homopolymer or an ethylene copolymer with, as cornonomer, a monomer chosen from the a-olefins defined above in the case of (C2), esters, of unsaturated carboxylic acids or •jinyles;ters of saturated carboxylic acids. The unsaturated carboxylic acid esters ■ire, for example, alkyl (rneth)acrylates, the alkyl of which has 1 to 24 carbon iEitorns Examples of alkyl acrylates or methacrylates are especially methyl rnethasrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate and 2-ethylhexyl iricrylaie. Saturated carboxylic acid vinylesters are, for example, vinyl acetate or 'vinyl propionate.
The polyethylene (D) may be a high-density PE (HDPE), a low-density PE V-DPE), a linear low-density PE (LLDPE), a very low-density PE (VL.DPE) or a netallocene PE.
'The polyethylene (D) may also be a polymer having an elastomeric character, tnat is to say it may be (i) an elastomer within the meaning of ASTM :>412, which means a material that can be stretched at room temperature to twice is length, held thus stretched for 5 minutes and then returning to a length that is loss than 10% different from its initial length after having been released, or (ii) a ,: olynier not having exactly the above characteristics but able to be stretched and returning approximately to its initial length. As examples, mention may be made of:
- EPR (ethylene-propylene rubber) and EPDM (ethylene propylene diene rionorner); and
- styrene elastomers, such as S3R (styrene/butadiene/rubber), SBS (styrene/ L'Utadtene/styrene) block copolymers, SEBS (styrene/ethylene-butadiene'/styrene) block copolymers and SIS (styrene/isoprene/styrene) block copolymers.

Advantageously, the polyethylene (D) is an LLDPE having a density of between 0.900 and 0.935 or else an HOPE having a density of between 0.935 and 0.950.
Advantageously the proportions in the blend (A) of polymers (C) and (D) are 10 to 30% oy weight of (C) per 90 to 70% by weight of (D), respectively.
With regard to the polymer (B), in which the blend (A) is diluted/this is a PP copolymer or propylene/ethylene/butyiene terpolymer. As comonomer, mention nay be made of:
• .^olefins, advantageously those having from 2 to 30 carbon atoms,
iuch as ethylene, 1-butene, 1-pentene, 3-methyM-butene, 1-hexene,
■- -methyM - pentene, 3-methyl-1 -pentene, 1 -octene, 1 -decene, 1 -dodecene,
1 -tetradece is, 1 -hexsdecene, 1 -octadecene, 1 -eicocene, 1 -dococene,
i-tetnacocer.e, 1-hexacocene, 1-octacocene and 1-triacontene. These a-olefins
'lay be usee by themselves or as a blend of two or more of them;
• diertes.
The polypropylene may also be a propylene block copolymer.
Advnntageously. the polymer (B) comprises a biend of several polymers, in 7,/hich ther^ is at least one polypropylene containing at least 50 mol% and preferably ai least 75 mol% polypropylene. As an example, the polymer (B) may :e a polypropyiene/EPDM or polypropylene/EPR blend.
The layers (1), (2), (3) and' (4) may have a thickness of between 50 and 500 i!ngstrorns in tie case of the layer (1), between 2 and 3 pm in the case of the iayer ;2), between 5 and 30 jjrn in .the case of the layer (3) and between 2 and 10 pm in • ie case of the layer (4).
The layers (2), (3) and (4) may be laminated together by a coextrusion ::-roces-s before the metal iayer (1) is applied. As regards the layer (1), this may be applied by vapour deposition, using a technique well known to those skilled in the ;:rt, and is preferably deposited under vacuum.
The metal layer (1) constitutes a good oxygen and water-vapour barrier.

The compositions of the iiayers (2), (3) and (4) may contain the additives normally used for processing polyolefins, having contents of between 10 ppm and K%, such as antioxidants based on substituted phenolic molecules, UV screens, processing aids, such as fatty amides, stearic acid and its salts, fluoropolymers, knowr as agents for avoiding extrusion defects, amlne-based defogging agents, antiblocking agents, such as silica or talc, and masterbatches with dyes and nucleating agents.
Figures 2 and 3 clearly shown the result of the invention compared with the prior 3it" The bags shown in these figures are similar to crisp packets, comprising firstly a pocket bounded by a mulliiayer structure (11, 12, 13, 14) in the case of Figure 2 and a multilayer structure (1, 2, 3, 4) in the case of Figure 3, the metai ■ayer 0) or (11) being in contact with the outside of the pocket, while the layer (4) ::T (14) is in contact with the inside of the pocket, The two bags or packets are closed by a welding strip (5a) of the multilayer film which constitutes them, the
ayer (4) or r\4) of each welding edge (5b), defining the opening of the bags (6), :eing welded to itself. An identical force (f) is then applied to these two packets on bach wide of the region adjoining the welding bancs (5a) so as to open the said :acke:s. It has been found that, by exerting the same force (f) on each side of the : acke.s in the directions indicated in the figures, different results are obtained depending :n whether the packet is one produced using a film according to the : rior art or a packet produced using a film according to the invention.
i the case of a bag or packet of Figure 2, it is obser/ed that there is oeiam nation, :hat is to say separation, of the metallized layer (11) from the layers ;12), (13) and (14), which remain bonded together. It may therefore*be stated that ;le force to dfclaminate the layer (11) is less than the force needed to break the welding be.id (5a). As a result, the bag in this case is difficult to open, the -netallized l^ysr (11) debonding first.
1 the case of Figure 3, no debonding of the layers (1), (2), (3) and (4) is observed, rather a failure within the welding band of the bag, resulting in the packer being opened via the edges (5b). The adhesive strength of the metal layer ■'11) is; much greater than the force needed to break the welding band (5a)f causing the b Film specimens 1 to 8 (see TABLE 1 below) were produced, these having a 'Multilayer structure of the BOPP(approximately 20 jim)/ink layer/liquid adhesive ^yer/MCPF' film (approximately 25 jxm) type.
The MCPP film had a 4-layer structure, as shown in Figure 1, namely;

Al layer (1) having a thickness of 250 angstroms;
layer (2) having a thickness of 3 urn, comprising:
> X% by weight of a blend (A), which itself comprises 25% by weight of netallocene PE (CI) of density d=0.870 with 1-octene as comonomer and of LLDPE (C2) of density d=0,920 with 1-butene as comonomer, the (C1)/(C2) blend being grafted with maleic anhydride with a degree of grafting of 0,8%, s.nd 75% by weight of LLDPE (D) with 1-butene as comonomer and c =0.9 10,
> Y% by weight of PP homopolymer (B) having an MFI=7 and c =0.900 and
> The value of X being indicated in the second column of TABLE 1 and the value of Y being equal to 100 - X;
layer (3) having a thickness of 17 urn of PP homopolymer having an MFl=7
and d"0.900;
• 'ayer {4) having a thickness of 5 ^m of propylene/ethylene/butylene
■Jsrpolymer PP with predominantly propylene; MF!=7, d=0.900; and flexurai
'^odulJS = 1000 mPa; and
i id expressed in g/cm3 and measured according to the ASTM D790 standard = 1; 19C0 mPa and MFI or meltflow index expressed in g/10 min according to the ASTM D 1238 standard at 230*C].
Tne ayers (1), (3) and (4) are the same in the case of specimens 1 to 8. ')nly the layer (2) differs through the proportions X and Y expressed in % by weight. Sealed bags v^ere then manufactured and peel force then measured in :/15nim.
It was found that, in the case of compositions comprising 5 to 50% of blend
A), the layer i2) failed, as shown in Figure 3, the Al layer being strongly bonded
;D the layer (2), whereas in the cases indicated by (*), the interface between the Ai
syer and the layer (2) failed, as illustrated in Figure 2, the Al layer beinq bonded
•nore weakly to the layer (2).
The films comprising a layer (2). with an amount of the blend (A) between 5 •ind 50% are therefore suitable for the manufacture of bags, sachets, pockets and rackets according to the invention.



CLAIMS
1. Tie comprising:
- 5 to 50% by weight of a blend (A), the said blend (A) comprising:
■ 5 tc 100% of a blend of polymers (CI) and (C2), consisting of 90 to
20% by weight of a metallocene polyethylene (C1) of density between
0.865 and 0.915 and of 10 to 80% by weight of a polymer (C2) which is
either a non-metallocene LLDPE or a polypropylene homopolymer or
copolymer, the blend of polymers (CI) and (C2) being cografted by an
unsaturated carboxylic acid or a functional derivative of this acid as
grafting monomer,
- &5 to 0% by weight of a polyethylene (D) chosen from polyethylene
homopolymers or copolymers and elastomers;
the blend (A) being such that:
*> the content of grafting monomer grafted is between 30 and
105 ppm; » the MFI or meliflow index (ASTM D 1238, at 190°C/2.16 kg) is between 0.1 and 30 g/10 min;
•• 50 to 9!:% by weight of a polypropylene homopolymer or copolymer (B).
. Multilaye- structure comprising a layer (2) of the tie according to Claim 1.
Multilayer structure according to Claim 2, characterized in trial it comprises a netal aver (1) bonded to the tie layer (2).
. Structure according to Claim 3, characterized in that the metal layer is a layer of Ai, Fe Cu. Sn, Ni, Ag, Cr or Au or an alloy containing predominantly at least one :-t these metal:;.
::, Multllayei structure according to Claim 4, characterized in that it comprises a polypropylene homopolymer or copolymer layer (3), the tie layer (2) being •andwichec between the metal layer (1) and the said polypropylene layer (3).
:!. Multilayer structure according to Claim 5, characterized in that it comprises a i.ryer (4) stch that the polypropylene layer (3) is sandwiched between the tie layer [2.) and the said layer (4), the latter layer being suitable for heat-sealing and comprising either an ethylene/propyiene/butylene terpoiymer, or an

'•ithylene/propylene copolymer, or a metallocene PE or blends thereof, and in this case the said blend comprises at least two of the abovementioned compounds.
7. Film comprising a multilayer structure according to one of Claims 2 to 6.
;?. Film characterized in that it comprises a printed biaxially oriented polypropylene /BOPP) or biaxially onented polyethylene terephthalate (BOPET) layer to which a netallized multilayer film having a structure according to one of Claims 3 to 6 is ■applied by means of an adhesive, the said film being biaxially oriented or not and ne mtital layer of the said metallized multilayer film being directly bonded by the adhesive to the printed BOPP or BOPET layer.
Use of the tie according to Claim 1 to manufacture a multilayer structure accorcing to one of Claims 2 to 6.
10, Article having a multilayer structure according to one of Claims 2 to 6.
1 I. Article manufactured using a film according to either of Claims 7 and 8.
12. Article according to Claim 11, characterized in that this article is a package.

9
13. A multilayer structure substantially as herein described with reference to the accompanying drawings.


Documents:

100-che-2004-abstract.pdf

100-che-2004-claims filed.pdf

100-che-2004-claims granted.pdf

100-che-2004-correspondnece-others.pdf

100-che-2004-correspondnece-po.pdf

100-che-2004-description(complete) filed.pdf

100-che-2004-description(complete) granted.pdf

100-che-2004-drawings.pdf

100-che-2004-form 1.pdf

100-che-2004-form 19.pdf

100-che-2004-form 26.pdf

100-che-2004-form 3.pdf

100-che-2004-form 5.pdf


Patent Number 202774
Indian Patent Application Number 100/CHE/2004
PG Journal Number 05/2007
Publication Date 02-Feb-2007
Grant Date 30-Oct-2006
Date of Filing 09-Feb-2004
Name of Patentee M/S. ATOFINA
Applicant Address 4/8 COURS MICHELET, LA DEFENCE 10, F-92800 PUTEAUX,
Inventors:
# Inventor's Name Inventor's Address
1 TECK SANG SIAW 274 JALAN MERPATI, SATU TAMAN MALAKE, BARU, 75350 MELAKA, MALAYSIA,
2 LEOJ YVES LE MONTAIGU, 27300 VALAILLES,
3 ROBERT PATRICE 7-PARC MAUBUISSON, F-27470 SERQUIGNY,
PCT International Classification Number B23B 27/08
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 03 01458 2003-02-07 France