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US4405745A
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Polymer stabilization
Assignee: Phillips Petroleum Co
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Filing: 1982-09-24
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Granted: 1983-09-20
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Expires: 2002-09-24
Abstract
Abstract The heat stability of arylene sulfide polymers, such as poly(p-phenylene sulfide), is improved by the addition of cure retarders comprising alkaline earth metal nitrites.
Inventors
- 👤 Ronald D. Mathis
- 👤 Jerry O. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
A polymer composition exhibiting improved heat stability comprising an arylene sulfide polymer containing an effective stabilizing amount sufficient to retard polymer curing and cross-linking of at least one alkaline earth metal nitrite.
Claim 2
Dependent Claim
32 words
A polymer composition exhibiting improved heat stability comprising an arylene sulfide polymer containing an effective stabilizing amount sufficient to retard polymer curing and cross-linking of at least one alkaline earth metal nitrite.
Claim 3
Dependent Claim
11 words
An article of manufacture formed from the composition of claim 1.
Claim 4
Dependent Claim
11 words
A fiber or film formed from the composition of claim 1.
Claim 5
Dependent Claim
30 words
A composition according to claim 1 wherein the amount of stabilizer present ranges from about 0.1 to about 5 weight percent based on the weight of the arylene sulfide polymer.
Claim 6
Dependent Claim
25 words
A composition according to claim 4 wherein said arylene sulfide polymer is a poly(p-phenylene sulfide) having a melt flow of about 50 to about 400.
Claim 7
Dependent Claim
23 words
A composition according to claim 1 wherein said arylene sulfide polymer is poly(p-phenylene sulfide) and said alkaline earth metal nitrite is calcium nitrite.
Claim 8
Dependent Claim
28 words
A composition according to claim 6 wherein the amount of calcium nitrite present is about 0.5 to about 2 weight percent based on the weight of poly(p-phenylene sulfide).
Claim 9
Independent Claim
39 words
A method for improving the heat stability of poly(arylene sulfide) polymers which comprises incorporating therein an effective stabilizing amount of an alkaline earth metal nitrite which amount is sufficient to retard curing and cross-linking of said polymer during heating.
Claim 10
Independent Claim
39 words
A method for improving the heat stability of poly(arylene sulfide) polymers which comprises incorporating therein an effective stabilizing amount of an alkaline earth metal nitrite which amount is sufficient to retard curing and cross-linking of said polymer during heating.
Claim 11
Dependent Claim
28 words
A method according to claim 8 wherein the amount of said stabilizer ranges from about 0.1 to about 5 weight percent based on the weight of said polymer.
Claim 12
Dependent Claim
12 words
A process according to claim 8 wherein said polymer is poly(p-phenylene sulfide).
Claim 13
Dependent Claim
23 words
A method according to claim 8 wherein said arylene sulfide polymer is poly(p-phenylene sulfide) and said alkaline earth metal nitrite is calcium nitrite.
Claim 14
Dependent Claim
27 words
A method according to claim 11 wherein said amount of calcium nitrite present is about 0.5 to about 2 percent based on the weight of poly(p-phenylene sulfide).
References Cited (Backward Citations)
US4214021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |