US5126380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of polyarylene sulphides for the production of a structural foam resistant to high temperatures, process for the preparation of this foam, and mouldings obtainable by this process
Assignee: Individual
•
Filing: 1991-10-28
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Granted: 1992-06-30
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Expires: 2011-10-28
Abstract
Abstract The invention relates to the use of polyarylene sulphides (PAS), preferably polyphenylene sulphide (PPS) for the preparation of a structural foam, a process for the production of this foam, and mouldings obtainable by this process.
Inventors
- 👤 Kurt-Rainer Stahlke
- 👤 William C. Bushong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C08J9/10; C08J2381/00; C08J2381/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
Polyarylene sulfide foam having a substantially uniform cell structure prepared by homogeneously blending polyarylene sulfide with 0.1 to 5% by weight of a blowing agent masterbatch and then foaming the homogeneous mixture by heating the mixture to 300° to 360° C., wherein said blowing agent masterbatch contains 0.2 to 10% by weight of a chemical blowing agent in an amorphous or partially crystalline polycarbonate resin resistant to high temperatures and having a relative viscosity of 1.260-1.285 measured in CH 2 Cl 2 at 25° C. at 0.5 gram per 100 ml, and wherein said blending is as a dry mixture for 10 to 40 minutes in a drum tumbler.
Claim 2
Dependent Claim
109 words
Polyarylene sulfide foam having a substantially uniform cell structure prepared by homogeneously blending polyarylene sulfide with 0.1 to 5% by weight of a blowing agent masterbatch and then foaming the homogeneous mixture by heating the mixture to 300° to 360° C., wherein said blowing agent masterbatch contains 0.2 to 10% by weight of a chemical blowing agent in an amorphous or partially crystalline polycarbonate resin resistant to high temperatures and having a relative viscosity of 1.260-1.285 measured in CH 2 Cl 2 at 25° C. at 0.5 gram per 100 ml, and wherein said blending is as a dry mixture for 10 to 40 minutes in a drum tumbler.
Claim 3
Dependent Claim
34 words
Polyarylene sulfide foam according to claim 1 wherein the amount of blowing agent masterbatch is 0.8 to 1.5% and the amount of chemical blowing agent in the masterbatch is 3 to 5% by weight.
Claim 4
Dependent Claim
18 words
Polyarylene sulfide foam according to claim 1 wherein foaming results in a density reduction of 35 to 50%.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |