(Ligno) Cellulose Material Board Coated with a Pmma and Pvdf-Based film

• US 20080311406A1
• Filed: 12/06/2006
• Published: 12/18/2008
• Est. Priority Date: 12/06/2005
• Status: Abandoned Application

• Current Assignee: Arkema France (Arkema)
• Original Assignee: Arkema France (Arkema)
• Inventors: Triballier, Karine, Laffargue, Johann, Duc, Sandrine, Mathieu, Cyrille, Rivas, Nadine, Godefroy, Frederic, Bonnet, Anthony
• Application Number:
  US12/096,089
• Publication Number:
  US 20080311406A1
• Time in Patent Office: Days
• US Class Current: 428/421
• CPC Class Codes: B32B 21/08 of synthetic resin
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2274/00 Thermoplastic elastomer material thermoplastic elastomer fibres B32B2262/0215, thermoplastic elastomer particles B32B2264/0221, thermoplastic elastomer foam B32B2266/0292
• CPC Class Codes: B32B 2307/71 Resistive to light or to UV
• CPC Class Codes: B32B 2307/712 Weather resistant
• CPC Class Codes: B32B 2419/00 Buildings or parts thereof walls, panels B32B2607/00
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers

Abstract

The invention relates to the use of a coextruded multilayer film for protecting a (lingo)cellulose material, wherein said multilayer film consists of the following arranged to each other layers: a surface layer (I) comprising PVDF and possibly PMMA in the form of the main components, an intermediate layer (II) comprising in the form of main components 0-60 PVDF parts, 40 to 100 PMMA parts, 0-25 acrylic elastomer parts, and 0-10 UV absorber parts, the totality thereof being equal to 100 parts, and an adhesive layer (III), which comprises a functional PMMA in the form of the main component and is arranged on the side of the (ligno)cellulose material.

Claims

1. A coextruded multilayer film/(ligno)cellulose composition comprising a coextruded film and a (lingo)cellulose material, said multilayer film comprising, in order, positioned one against another:

a surface layer (I) comprising, as main constituents, polyvinylidene fluoride (PVDF) and optionally polymethylmethacrylate (PMMA);

an intermediate layer (II) comprising, as main constituents, from 0 to 60 parts of a PVDF, from 40 to 100 parts of a PMMA, from 0 to 25 parts of an acrylic elastomer and from 0 to 10 parts of a UV absorber, the total forming 100 parts;

an adhesive layer (III) comprising, as main constituent, a functional PMMA, the adhesive layer (III) being positioned on the side of the multilayer film in contact with said (ligno)cellulose material.

2. The coextruded multilayer film composition of claim 1 comprising a panel comprising at least one layer of a (ligno)cellulose material, the multilayer film comprising, in order, positioned one against another:

a surface layer (I) comprising, as main constituents, a PVDF and optionally a PMMA;

an intermediate layer (II) comprising, as main constituents, from 0 to 60 parts of a PVDF, from 40 to 100 parts of a PMMA, from 0 to 25 parts of an acrylic elastomer and from 0 to 10 parts of a UV absorber, the total forming 100 parts;

an adhesive layer (III) comprising, as main constituent, a functional PMMA, and being applied to at least one of the two outer faces of the panel composed of a (ligno)cellulose material, the adhesive layer (III) being positioned on the side of at least one of the said outer faces of the panel.

3. The composition according to claim 1 wherein the film is in contact with a thermosetting adhesive at the surface or in the body of the (ligno)cellulose material.

4. The composition according to claim 1, wherein the surface layer (I) comprises, as main constituents, from 50 to 100 parts of a PVDF per respectively from 50 to 0 parts of PMMA, the total forming 100 parts.

5. The composition according to claim 1, wherein the surface layer (I) comprises, as main constituents, from 70 to 100 parts of PVDF per respectively from 30 to 0 parts of PMMA and preferably from 75 to 85 parts of PVDF per respectively 25 to 15 parts of PMMA, the total forming 100 parts.

6. The composition according to claim 1, wherein the surface layer (I) is provided in the form of two superimposed layers:

a layer (Ia) comprising, as main constituents, 75 to 100 parts of PVDF per respectively 25 to 0 parts of PMMA;

a layer (Ib), in contact with the intermediate layer (II), comprising, as main constituents, 50 to 90 parts of PVDF per respectively 50 to 10 parts of PMMA.

7. The composition according to claim 1, wherein the intermediate layer (II) comprises, as main constituents, from 0 to 60 parts of PVDF, from 40 to 100 parts of PMMA, from 0 to 25 parts of acrylic elastomer and from 0 to 10 parts of UV absorber, the total forming 100 parts.

8. The composition according to claim 7, wherein the intermediate layer (II) comprises, as main constituents, from 20 to 60 parts of PVDF, from 40 to 60 parts of PMMA, from 0 to 25 parts of acrylic elastomer and from 0 to 10 parts of UV absorber, the total forming 100 parts.

9. The composition according to claim 8, wherein the intermediate layer (II) comprises, as main constituents, from 30 to 50 parts of PVDF, from 40 to 60 parts of PMMA, from 0 to 20 parts of acrylic elastomer and from 0 to 5 parts of UV absorber, the total forming 100 parts.

10. The composition according to claim 7, wherein the intermediate layer (II) comprises from 20 to 50 parts of PVDF, from 50 to 80 parts of a PMMA comprising, by weight, from 90 to 50% of MMA per respectively from 10 to 50% of an alkyl(meth)acrylate, the alkyl having from 2 to 4 carbon atoms, and from 0 to 5 parts of a UV absorber, the total forming 100 parts.

11. The composition according to claim 7, wherein the intermediate layer (II) comprises from 25 to 45 parts of PVDF, from 55 to 75 parts of PMMA comprising, by weight, from 90 to 50% of MMA per respectively from 10 to 50% of an alkyl(meth)acrylate, the alkyl having from 2 to 4 carbon atoms, and from 0 to 5 parts of a UV absorber, the total forming 100 parts.

12. The composition according to claim 10, wherein the PMMA comprises, by weight, from 85 to 70% of MMA per respectively from 15 to 30% of an alkyl(meth)acrylate, the alkyl having from 2 to 4 carbon atoms.

13. The composition according to claim 10, wherein the PMMA comprises, by weight, from 80 to 70% of MMA per respectively from 20 to 30% of an alkyl(meth)acrylate, the alkyl having from 2 to 4 carbon atoms.

14. The composition according to claim 10, wherein the alkyl(meth)acrylate is methyl acrylate, ethyl acrylate or butyl acrylate.

15. The composition according to claim 1, wherein the adhesive layer (III) comprises, by weight, more than 60%, of a functional PMMA.

16. The composition according to claim 15, wherein the adhesive layer (III) does not comprise fluoropolymer.

17. The composition according to claim 15, wherein the functional PMMA comprises, by weight, from 0.5 to 15%, of at least one monomer carrying at least one acid, acid salt, acid chloride, epoxide, alcohol or anhydride functional group.

18. The composition according to claim 15, wherein the functional PMMA comprises, by weight:

from 65 to 99.5% of MMA,

from 0.5 to 15% of (meth)acrylic acid and/or the anhydride resulting from (meth)acrylic acid,

from 0 to 20% of a 3rd monomer which can be copolymerized with the MMA.

19. (canceled)

20. (canceled)