High gas barrier co-extruded multiplayer films

• US 5,258,230 A
• Filed: 05/04/1992
• Issued: 11/02/1993
• Est. Priority Date: 05/04/1992
• Status: Expired due to Fees

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Work, William J., LaFleur, Edward E.
• Primary Examiner(s): Sluby, P. C.
• Application Number:
  US07/878,099
• Time in Patent Office: 547 Days
• Field of Search: 428/516, 428/518, 428/520, 428/483, 428/412, 428/473.5, 428/476.3, 428/476.9, 428/910
• US Class Current: 428/412
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 27/08 of synthetic resin
• 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 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 27/365 comprising polycarbonates
• CPC Class Codes: C08J 11/08 using selective solvents for polymer components
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08L 33/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31721 Of polyimide
• CPC Class Codes: Y10T 428/3175 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31757 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/3192 : Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31928 : Ester, halide or nitrile of addition polymer

Abstract

By addition of methacrylate/unsaturated acid and/or vinyl amide copolymers, poly(vinyl alcohol) can be melt-processed and co-extruded with structural polymers like poly(ethylene terephthalate) to form multilayer films and objects with good adhesion between the components and good barrier properties. The films and objects can be separated and re-used by dissolution in water of the poly(vinyl alcohol)/methacrylate polymer blends and recovery of the structural polymer.

Claims

1. A multi-layer composite comprising alternating layers of:

(a) a film or sheet of a structural polymer chosen from the group consisting of poly(vinyl chloride), a polyolefin, a polycarbonate, a polyglutarimide, a polymer of methyl methacrylate, a polyamide, or a polyester;

(b) a film or sheet of a polymeric blend of;

(i) from above about 50 to 90 parts by weight of a polymer containing at least 50 mol % of units of the structure ##STR8## (ii) from 10 to below about 50 parts by weight of a polymer containing at least about 70 parts of units derived from a lower alkyl methacrylate, and at least one of either up to about 30 parts of units derived from from a vinyl or vinylidene monomer containing an amide group or up to about 30 parts of units derived from an unsaturated carboxylic acid or anhydride;

the film or sheet of part (a) being the external layers.

3. The multi-layer composite of claims 1 or 2 wherein the units derived from a lower alkyl methacrylate are units derived from methyl methacrylate and wherein the units derived from a vinyl or vinylidene monomer containing an amide group are units derived from N-vinylpyrrolidone.

4. The multi-layer composite of claims 1 or 2 wherein the composite is biaxially oriented.

5. The multi-layer composite of claim 3 wherein the polyester contains units derived from ethylene glycol and terephthalic acid.

6. The multi-layer composite of claim 5 wherein the polyester further contains units derived from cyclohexanedimethanol.

2. A multi-layer composite comprising alternating layers of:

(a) a film or sheet of a structural polymer chosen from the group consisting of poly(vinyl chloride), a polyolefin, a polycarbonate, a polyglutarimide, a polymer of methyl methacrylate, a polyamide, or a polyester.;

(b) a film or sheet of a polymeric blend of;

(i) from 70 to 90 parts by weight of a polymer containing at least 50 mol % of units of the structure ##STR9## (ii) from 10 to 30 parts by weight of a polymer containing at least about 70 parts of units derived from a lower alkyl methacrylate, and at least one of either up to about 30 parts of units derived from a vinyl or vinylidene monomer containing an amide group or up to about 30 parts of units derived from an unsaturated carboxylic acid or anhydride;

the film or sheet of part (a) being the external layers.