US5013518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamide sheet products
Assignee: Bayer AG
•
Filing: 1989-07-17
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Granted: 1991-05-07
•
Expires: 2009-07-17
Abstract
Abstract This invention relates to a process for the production of shrinkable sheet products from copolyamides with good processing properties. The copolyamides consist of ε-caprolactam and equimolar quantities of dimeric fatty acids and diamines.
Inventors
- 👤 Werner Nielinger
- 👤 August Bockmann
- 👤 Hermann Brinkmeyer
- 👤 Helmut Schulte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/34; C08G69/36; C08J2377/00; C08J2377/06; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
Process for the production of transparent sheet products comprising blowing or extruding a copolyamide comprising of from 85.0 to 99.5 parts by weight of units of ε-caprolactam and from 0.5 to 15.0 parts by weight of units of equimolar quantities of dimerised fatty acids and diamines wherein said products are formed at a temperature of from 220° to 260° C. to form said product.
Claim 2
Dependent Claim
64 words
Process for the production of transparent sheet products comprising blowing or extruding a copolyamide comprising of from 85.0 to 99.5 parts by weight of units of ε-caprolactam and from 0.5 to 15.0 parts by weight of units of equimolar quantities of dimerised fatty acids and diamines wherein said products are formed at a temperature of from 220° to 260° C. to form said product.
Claim 3
Dependent Claim
35 words
Process for the production of sheet products according to claim 1 wherein the dimerised fatty acid comonomer contains from 32 to 40 carbon atoms and less than 5 parts by weight if trimerised fatty acid.
Claim 4
Dependent Claim
23 words
Process for the production of flat sheet products according to claim 1 wherein the diamine used is hexamethylene diamine, 3-aminomethyl-3,5,5-trimethyl-cyclohexylamine or mixtures thereof.
Claim 5
Dependent Claim
23 words
Process for the production of flat sheet products according to claim 2 wherein the diamine used is hexamethylene diamine, 3-amino-methyl-3,5,5-trimethylcyclohexylamine or mixtures thereof.
Claim 6
Dependent Claim
15 words
Process according to claim 1 wherein the dimerised fatty acid comonomer contains 36 carbon atoms.
Claim 7
Dependent Claim
22 words
Process according to claim 1 wherein the dimerised fatty acid comonomer contains less than 3 parts by weight of trimerised fatty acid.
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |