Patent US4590104A successfully refreshed from Google Patents.
US4590104A
Expired / Lapsed
US
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Production of fiber-reinforced materials
Assignee: BASF SE
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Filing: 1985-02-14
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Granted: 1986-05-20
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Expires: 2005-02-14
Abstract
Abstract Fiber-reinforced materials are produced by impregnating continuous filaments with a melt of a polyarylene sulfide ketone, preferably one having a reduced viscosity η red of from 0.1 to 0.5 [dl.g -1 ], shaping the resulting semi-finished product to give a finished article and heating the latter for not less than 15 minutes at above the crystallite melting point of the polyarylene sulfide ketone, the latter undergoing crosslinking and its glass transition temperature Tg increasing by not less than 5° C.
Inventors
- 👤 Hartmut Zeiner
- 👤 Jurgen Fischer
- 👤 Gerhard Heinz
- 👤 Peter Neumann
- 👤 Dietmar Nissen
- 👤 Gerhard Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:20
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J2381/00; C08J2381/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A process for the production of fiber-reinforced materials comprising the following steps in sequence: (a) impregnating continuous filaments or fibrous structures with a low-viscosity melt of a low-molecular weight polyarylene sulfide ketone characterized by repeating units of the formula ##STR4## (b) shaping the resulting semi-finished product to give a finished article, and then (c) heating the finished article for a period of not less than 15 minutes at a temperature above the crystallite melting point of the polyarylene sulfide ketone to effect a crosslinking thereof.
Claim 2
Dependent Claim
85 words
A process for the production of fiber-reinforced materials comprising the following steps in sequence: (a) impregnating continuous filaments or fibrous structures with a low-viscosity melt of a low-molecular weight polyarylene sulfide ketone characterized by repeating units of the formula ##STR4## (b) shaping the resulting semi-finished product to give a finished article, and then (c) heating the finished article for a period of not less than 15 minutes at a temperature above the crystallite melting point of the polyarylene sulfide ketone to effect a crosslinking thereof.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1, wherein the reduced viscosity η red of the polyarylene sulfide ketone used for the impregnation is from 0.1 to 0.5 [dl.g -1 ].
Claim 4
Dependent Claim
39 words
A process as claimed in claim 1, wherein the glass transition temperature Tg of the polyarylene sulfide ketone is increased by not less than 5° C., preferably by not less than 10° C., as a result of the crosslinking.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |