US4810316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a foamed base material for car ceiling member
Assignee: JSP Corp
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Filing: 1987-09-01
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Granted: 1989-03-07
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Expires: 2007-09-01
Abstract
Abstract A thermoplastic resin having a Vicat softening point of 115 DEG C. or higher and containing a blowing agent is extruded and foamed into a foamed tubular body. The foamed tubular body is subjected to biaxial orientation and then pressed in antipodal directions, whereby the foamed tubular body is flattened and fusion-bonded at the resultant mutually-opposing inner walls thereof to obtain a foamed base material suitable for use in the fabrication of a car ceiling member. The foamed base material has not only excellent mechanical strength but also superb thermal strength. The foamed base material is not required to laminate films, sheets or the like thereon and is hence provided at a low cost.
Inventors
- 👤 Kouichi Wakabayashi
- 👤 Nobuyoshi Shimayashiki
- 👤 Akira Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:14
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B32B5/18; B29C48/001; B29C48/0012; B29C48/0018; B29C48/0019; B29C65/00; B29C65/02; B29C66/00; B29C66/70; B29C66/71; B29C66/72; B29C66/727; B29K; B29K2105/00; B29K2105/04; B29L; B29L2023/00; B29L2031/00; B29L2031/30; B29L2031/3005; B29L2031/3011; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2307/00; B32B2307/50; B32B2307/514; B60; B60R; B60R13/00; B60R13/02; B60R13/0212; B60R13/0225; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A process for the production of a foamed base material for a car ceiling member, which comprises melting and kneading a styrene-acrylic copolymer resin or styrene-methacrylic copolymer resin, having a Vicat melting point of at least 115° C., together with a blowing agent in an extruder, extruding the resultant melt through a circular die while applying biaxial orientatiion, to thereby form a foamed tubular body having a blow-up ratio greater than 3, and then pressing the foamed tubular body in antipodal directions, whereby the foamed tubular body is flattened and fusion-bonded at the resultant mutually-opposing inner walls thereof.
Claim 2
Dependent Claim
98 words
A process for the production of a foamed base material for a car ceiling member, which comprises melting and kneading a styrene-acrylic copolymer resin or styrene-methacrylic copolymer resin, having a Vicat melting point of at least 115° C., together with a blowing agent in an extruder, extruding the resultant melt through a circular die while applying biaxial orientatiion, to thereby form a foamed tubular body having a blow-up ratio greater than 3, and then pressing the foamed tubular body in antipodal directions, whereby the foamed tubular body is flattened and fusion-bonded at the resultant mutually-opposing inner walls thereof.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the blowing agent is a mixture of dichlorodifluoromethane and methyl and/or ethyl chloride.
Claim 4
Dependent Claim
48 words
The process of claim 1 wherein the blowing agent is composed of a mixture of dichlorodifluoromethane and methyl and/or ethyl chloride at a weight ratio of 5:95-80:20, said blowing agent being used in an amount of 1-6 parts by weight per 100 parts by weight of the resin.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein the resultant melt is extruded through the circular die while applying biaxial orientation of from 5 to 40% in each of the two directions.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein the degree of biaxial orientation is from 15 to 40% in each direction.
References Cited (Backward Citations)
US3121911A
Cited
US3194864A
Cited
US3248462A
Cited
US3804684A
Cited
US3790436A
Cited
US4256797A
Cited
JPS5542887A
Cited
JPH05332514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |