# US 5,346,762 A · Laminated polyphenylene sulfide film and process for producing the same

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- Number: US 5,346,762 A
- Document ID: US5346762A
- Status: Granted
- Kind: A
- Application number: 07/958,338
- Filed: 1993-01-28
- Granted: 1994-09-13
- Earliest claimed: 1991-04-18
- Assignees: Toray Industries, Inc.
- Inventors: Kenji Kida; Shinichiro Miyaji; Yukichi Deguchi
- Web page: https://patentgrep.com/patent/US5346762A

## CPC

- B32B 27/08: of synthetic resin
- B32B 27/286: {comprising polysulphones; polysulfides}
- B32B 2307/518: bi-axially
- B32B 2309/105: Thickness
- Y10S 428/91: Product with molecular orientation
- Y10T 428/265: 1 mil or less
- Y10T 428/31533: Of polythioether
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A laminated polyphenylene sulfide film having excellent adhesiveness, especially heatsealability, and good mechanical properties and heat resistance, as well as a process for producing the same are disclosed. A central layer is constituted by a biaxially oriented polyphenylene sulfide film and a surface layer is constituted by phenylene sulfide copolymer containing a copolymerization unit other than p-phenylene sulfide unit in an amount of not less than 3 mol % and less than 50 mol %, so that the film has an improved adhesiveness and heatsealability while retaining the heat resistance and mechanical properties of biaxially oriented polyphenylene sulfide films.

## Claims

### Claim 1

A laminated polyphenylene sulfide film comprising a central layer consisting essentially of a biaxially oriented poly-p-phenylene sulfide film, and a surface layer consisting essentially of a phenylene sulfide copolymer film in which at least one copolymerization unit other than p-phenylene sulfide unit is copolymerized with p-phenylene sulfide unit, which is laminated on at least one surface of the central layer, the resin compositions constituting said layers satisfying the following equations (1)-(4):
50.ltoreq.PPSF(A).ltoreq.95 (1)
PPSF(B).gtoreq.90 (2)
3.ltoreq.COPF(A)<50 (3)
PPSF(A)<PPSF(B) (4)
wherein
PPSF(A) is the content of p-phenylene sulfide unit in said surface layer in terms of mol % with respect to the total repeating units in said surface layer;
PPSF(B) is the content of p-phenylene sulfide unit in said central layer in terms of mol % with respect to the total repeating units in said central layer; and
COPF(A) is the content of copolymerization unit in said surface layer, whose content is the second largest next to that of p-phenylene sulfide unit, in terms of mol % with respect to the total repeating units in said surface layer.

### Claim 2 (depends on 1)

The laminated polyphenylene sulfide film of claim 1, wherein said phenylene sulfide copolymer film constituting said surface layer is substantially non-oriented.

### Claim 3 (depends on 1)

The laminated polyphenylene sulfide film of claim 1, wherein said copolymerization unit whose content is the second largest next to that of p-phenylene sulfide unit is m-phenylene sulfide unit.

### Claim 4 (depends on 1)

The laminated polyphenylene sulfide film of claim 1, wherein said surface layer has a thickness of 0.01-5 .mu.m.

### Claim 5

A process of producing a laminated polyphenylene sulfide film comprising the steps of laminating on at least one surface of a poly-p-phenylene sulfide composition a phenylene sulfide copolymer in which at least one copolymerization unit other than p-phenylene sulfide unit is copolymerized with p-phenylene sulfide unit by co-extrusion to obtain a laminated sheet; biaxially stretching the laminated sheet; and heat-setting the resultant; the compositions of said phenylene sulfide copolymer composition and said poly-p-phenylene sulfide composition satisfying the following equations (5)-(8):
50.ltoreq.PPSP(A).ltoreq.95 (5)
PPSP(B).gtoreq.90 (6)
3.ltoreq.COPP(A)<5 (7)
PPSP(A)<PPSP(B) (8)
wherein
PPSP(A) is the content of p-phenylene sulfide unit in the phenylene sulfide copolymer composition in terms of mol % with respect to the total repeating units in said phenylene sulfide copolymer composition;
PPSP(B) is the content of p-phenylene sulfide unit in the poly-p-phenylene sulfide composition in terms of mol % with respect to the total repeating units in said poly-p-phenylene sulfide composition; and
COPP(A) is the content of copolymerization unit in the phenylene sulfide copolymer composition, whose content is the second largest next to that of p-phenylene sulfide unit, in terms of mol % with respect to the total repeating units in said phenylene sulfide copolymer composition.