Patent US4172069A successfully refreshed from Google Patents.
US4172069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of polyamides
Assignee: BASF SE
•
Filing: 1977-09-14
•
Granted: 1979-10-23
•
Expires: 1997-09-14
Abstract
Abstract Thermoplastic nylons are stabilized with copper compounds and synergistic halides by incorporation of from 0.1 to 10% of a concentrate of nylon, copper bromide or iodide and calcium bromide, zinc bromide or magnesium bromide. The stabilized nylons may be thermoplastically processed to give semimanufactures or films.
Inventors
- 👤 Claus Cordes
- 👤 Peter Horn
- 👤 Hans-Peter Weiss
- 👤 Herbert Gutsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:27
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/16; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08K3/18; C08K3/24; C08L; C08L77/00; C08J2477/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for stabilizing a thermoplastic polyamide which comprises: incorporating into a thermoplastic polyamide A having a K value (measured by the Fikentscher method) of more than 65, from 0.1 to 10% by weight, based on the polyamide A, of a homogeneous concentrate of (a) from 68 to 97.9% by weight of a polyamide B having a K value of from 60 to 85, (b) from 0.1 to 2% by weight of copper-(I) bromide and (c) from 2 to 30% by weight of calcium bromide, the percentages being based on the weight of the concentrate.
Claim 2
Dependent Claim
95 words
A process for stabilizing a thermoplastic polyamide which comprises: incorporating into a thermoplastic polyamide A having a K value (measured by the Fikentscher method) of more than 65, from 0.1 to 10% by weight, based on the polyamide A, of a homogeneous concentrate of (a) from 68 to 97.9% by weight of a polyamide B having a K value of from 60 to 85, (b) from 0.1 to 2% by weight of copper-(I) bromide and (c) from 2 to 30% by weight of calcium bromide, the percentages being based on the weight of the concentrate.
Claim 3
Dependent Claim
30 words
A process as set forth in claim 1, in which the polyamide A to be stabilized is polycaproamide or polyhexamethylene adipamide having a K value of from 70 to 95.
Claim 4
Dependent Claim
27 words
A process as set forth in claim 1, wherein the polyamide B is poly-ε-caprolactam or polyamide copolymer which contains a major proportion by weight of co-condensed ε-caprolactam.
Claim 5
Dependent Claim
40 words
A process as set forth in claim 1, wherein the homogeneous concentrate has been manufactured by melting the polyamide B at from 200 to 300° C. and mixing it with the copper-(I) compound and the metal bromide in pulverulent form.
Claim 6
Dependent Claim
24 words
A process as set forth in claim 1, wherein the polyamide A and the concentrate differ in their viscosities by less than 1,000 poise.
Claim 7
Dependent Claim
34 words
A process as set forth in claim 1, wherein the polyamide A and the homogeneous concentrate are mixed in the solid state, then fused at from 200° to 320° C. and then processed thermoplastically.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 1, wherein the mixture is processed thermoplastically to give films or sheeting.
Claim 9
Dependent Claim
35 words
A stabilized thermoplastic polyamide containing from 10 to 200 ppm of copper, in which the copper is present as copper-(I) bromide and the polyamide also contains from 0.02 to 1.0% by weight of calcium bromide.
Claim 10
Dependent Claim
35 words
A stabilized thermoplastic polyamide containing from 10 to 200 ppm of copper, in which the copper is present as copper-(I) bromide and the polyamide also contains from 0.02 to 1.0% by weight of calcium bromide.
Claim 11
Dependent Claim
21 words
A process as set forth in claim 1, wherein the polyamide A is polyhexamethylene adipamide and the polyamide B is polycaproamide.
References Cited (Backward Citations)
US2705227A
Cited
US3519595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |