US4940629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced thermoplastic integral skin foams and manufacture thereof
Assignee: BASF SE
•
Filing: 1989-04-24
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Granted: 1990-07-10
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Expires: 2009-04-24
Abstract
Abstract Fiber reinforced thermoplastic integral skin foams of density 50-500 kg/m 3 have an outer skin 0.05 to 1.5 mm in thickness and contain from 2 to 60% by weight of reinforcing fibers.
Inventors
- 👤 Heinz Weber
- 👤 Gerhard Bleckmann
- 👤 Gerhard Dembek
- 👤 Gerd Ehrmann
- 👤 Gerhard Heinz
- 👤 Lothar Schlemmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; C08J9/0085; C08J9/36; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/652
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A fiber reinforced thermoplastic integral skin foam of density 50-500 kg/m 3 having a solid outer skin 0.05-1.5 mm in thickness, containing from 2 to 60 % by weight of reinforcing fibers in mat form having a median fiber length of not less than 50 mm.
Claim 2
Dependent Claim
46 words
A fiber reinforced thermoplastic integral skin foam of density 50-500 kg/m 3 having a solid outer skin 0.05-1.5 mm in thickness, containing from 2 to 60 % by weight of reinforcing fibers in mat form having a median fiber length of not less than 50 mm.
Claim 3
Dependent Claim
38 words
A fiber reinforced thermoplastic integral skin foam as claimed in claim 1, wherein the foam consists of a polyolefin, a styrene polymer, a polyamide, an aromatic polycarbonate, an aromatic polyether sulfone, a polyphenylene ether or a polyphenylene sulfide.
Claim 4
Dependent Claim
27 words
A fiber reinforced thermoplastic integral skin foam as claimed in claim 1, wherein the reinforcing fibers in mat form consist of glass, carbon, aromatic polyamide or metal.
Claim 5
Dependent Claim
77 words
A process for manufacturing a fiber reinforced thermoplastic integral skin foam as claimed in claim 1, which comprises pressmolding fiber mats with the melt of a blowing agent containing thermoplastic polymer under a pressure at which any foaming of the melt is prevented, then foaming the fiber mat reinforced, blowing agent containing polymer at temperatures above the softening point, and, after the foam has become solid, again compacting the outer skin at temperatures above the softening point.
References Cited (Backward Citations)
US4766031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |