Multilayered structure

• US 5,094,921 A
• Filed: 08/08/1990
• Issued: 03/10/1992
• Est. Priority Date: 05/30/1989
• Status: Expired due to Term

• Current Assignee: Kuraray Company Limited
• Original Assignee: Kuraray Company Limited
• Inventors: Sato, Toshiaki, Moritani, Tohei, Negi, Taichi, Itamura, Sumio
• Primary Examiner(s): Cashion, Jr., Merrell C.
• Assistant Examiner(s): NAKARANI, DHIRAJLAL S
• Application Number:
  US07/563,843
• Time in Patent Office: 580 Days
• Field of Search: 428/517, 428/518, 428/520, 428/521, 428/522, 428/483, 428/476.3, 525/57, 525/58
• US Class Current: 428/520
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2325/00 Polymers of vinyl-aromatic compounds, e.g. polystyrene
• CPC Class Codes: B32B 2327/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2377/00 Polyamides
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• 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: C08L 101/00 Compositions of unspecified macromolecular compounds
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/08 Copolymers of ethene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/26 modified by chemical after-treatment
• CPC Class Codes: C08L 25/06 Polystyrene
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• 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 27/06 Homopolymers or copolymers of vinyl chloride
• 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 67/00 : Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/00 : Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: Y10T 428/3175 : Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31917 : Next to polyene 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
• CPC Class Codes: Y10T 428/31931 : Polyene monomer-containing
• CPC Class Codes: Y10T 428/31935 : Ester, halide or nitrile of addition polymer

Abstract

Provided are multilayered structures comprising at least 2 layers of a layer which comprises a resin composition comprising:

(A) a thermoplastic resin,

(B) a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 65 mol % and a saponification degree of vinyl acetate component of at least 96%, and

(C) a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 68 to 98 mol % and a saponification degree of vinyl acetate component of at least 20%, and

a layer which comprises a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 65 mol % and a saponification degree of vinyl acetate component of at least 96%.

These multilayered structures have excellent gas barrier properties and resistance to intralayer delamination, and the resin composition layer thereof has neat appearance.

Claims

1. A multilayered structure comprising at least 2F-layers wherein each of said F-layers comprises a resin composition comprising:

(A) a thermoplastic resin,

(B) a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 65 mol % and a saponification degree of vinyl acetate component of at least 96%, and

(C) a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 68 to 98 mol % and a saponification degree of vinyl acetate component of at least 20%, and a barrier layer which comprises a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 65 mol % and a saponification degree of vinyl acetate component of at least 96% wherein said barrier layer is sandwiched between the F-layers.

2. A multilayered structure according to claim 1, wherein said thermoplastic resin (A) is a polyolefin.

3. A multilayered structure according to claim 2, wherein said polyolefin (A) is a polypropylene resin.

4. A multilayered structure according to claim 2, wherein said polyolefin (A) is a polyethylene resin.

5. A multilayered structure according to claim 1, wherein said thermoplastic resin (A) is a polyamide resin.

6. A multilayered structure according to claim 1, wherein said thermoplastic resin (A) is a polyester resin.

7. A multilayered structure according to claim 1, wherein said thermoplastic resin (A) is a polystyrene resin.

8. A multilayered structure according to claim 1, wherein said thermoplastic resin (A) is a polyvinyl chloride resin.

9. A multilayered structure according to claim 1, wherein said components (A), (B), and (C) are incorporated in a ratio by weight of (A):

(B) of 60;

40 to 99.9;

0.1 and that of ((A)+(B));

(C) of 99.7;

0.3 to 70;

30.