US3970634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhexamethylene adipamide molding compositions not subject to discoloration when conditioned with water
Assignee: BASF SE
•
Filing: 1975-05-12
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Granted: 1976-07-20
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Expires: 1995-05-12
Abstract
Abstract Molding compositions based on polyhexamethylene adipamide and containing phenolic additives and, to obviate discoloration on conditioning, from 0.001 to 0.5% by weight, based on polyhexamethylene adipamide, of a compound having a chain transfer constant for styrene at 100°C of more than 1.5. The preferred chain transfer agent used is n-dodecylmercaptan.
Inventors
- 👤 Peter Horn
- 👤 Claus Cordes
- 👤 Richard Pflueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/0008; C08K5/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A molding composition comprising: 1. polyhexamethylene adipamide, 2. a phenolic antioxidant, and 3. from 0.001 to 0.5% by weight based on the weight of said polyhexamethylene adipamide of a chain transfer agent having a chain transfer constant for styrene at 100°C which is greater than 1.5.
Claim 2
Dependent Claim
46 words
A molding composition comprising: 1. polyhexamethylene adipamide, 2. a phenolic antioxidant, and 3. from 0.001 to 0.5% by weight based on the weight of said polyhexamethylene adipamide of a chain transfer agent having a chain transfer constant for styrene at 100°C which is greater than 1.5.
Claim 3
Dependent Claim
27 words
A molding composition as set forth in claim 1 wherein said chain transfer agent has a chain transfer constant for styrene at 100°C of from about 8-30.
Claim 4
Dependent Claim
16 words
The molding composition as set forth in claim 1 wherein said chain transfer agent is n-dodecylmercaptan.
Claim 5
Dependent Claim
29 words
A process for the manufacture of molding compositions as set forth in claim 1, wherein the chain transfer agent is added to the molten polyhexamethylene adipamide following polycondensation thereof.
References Cited (Backward Citations)
US3023074A
Cited
GB1141352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |