US5401349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of shaped articles
Assignee: BASF SE
•
Filing: 1994-03-08
•
Granted: 1995-03-28
•
Expires: 2014-03-08
Abstract
Abstract In a process for producing shaped articles by curing prepregs from fiber reinforced laminating resins by the autoclave method of vacuum bagging, the prepreg laminates are covered with a film of nylon 66 having a caprolactam content of from 3 to 30% by weight.
Inventors
- 👤 Walter Goetz
- 👤 Hans-Peter Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:27
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C43/00; B29C43/32; B29C43/36; B29C43/3642; C08J5/24; C08J5/241; C08J5/244; C08J2377/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A process for producing shaped articles by thermal curing of prepregs made from fiber reinforced laminating resins comprising laying prepreg laminates enclosed on both sides by release films onto a support surface, covering said laminates with a gas impermeable film, evacuating the space between the support surface and the cover film and exposing the assembly to an elevated temperature in an autoclave, wherein the polyamide film comprises a copolyamide containing from 85 to 92% by weight of nylon 66 units and from 8 to 15% by weight of nylon 6 units.
Claim 2
Dependent Claim
91 words
A process for producing shaped articles by thermal curing of prepregs made from fiber reinforced laminating resins comprising laying prepreg laminates enclosed on both sides by release films onto a support surface, covering said laminates with a gas impermeable film, evacuating the space between the support surface and the cover film and exposing the assembly to an elevated temperature in an autoclave, wherein the polyamide film comprises a copolyamide containing from 85 to 92% by weight of nylon 66 units and from 8 to 15% by weight of nylon 6 units.
Claim 3
Dependent Claim
14 words
A process as in claim 1 wherein the copolyamide contains a copper (I) stabilizer.
Claim 4
Dependent Claim
23 words
A process as in claim 2 wherein said stabilizer is a Cu(I)/KI complex having a Cu content of from 30 to 1000 ppm.
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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) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |