US3725362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(arylene sulfide) composition and method for decreasing the melt flow of poly(arylene sulfide)
Assignee: Phillips Petroleum Co
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Filing: 1971-03-08
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Granted: 1973-04-03
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Expires: 1991-03-08
Abstract
Abstract The melt flow of poly(arylene sulfides) is decreased by heating the polymer in the presence of a melt flow modifier comprising sulfur and a melt flow modifier rate accelerator such as zinc oxide at a temperature above the melt point of the resin. The poly(arylene sulfide) materials of decreased melt flow retain their thermoplastic character and are readily formed into useful shaped objects as by injection molding.
Inventors
- 👤 J Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:12
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286; C08G75/0295; C08K; C08K3/00; C08K3/02; C08K3/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
13 words
A composition according to claim 1 wherein said rate accelerator is zinc oxide.
Claim 2
Dependent Claim
56 words
A composition of matter according to claim 1 wherein said poly(arylene sulfide) comprises the reaction product formed by contacting at least one polyhalo-substituted cyclic compound containing unsaturation between adjacent ring atoms and wherein the halogen atoms are attached to ring carbon atoms with an alkali metal sulfide in a polar organic solvent at an elevated temperature.
Claim 3
Dependent Claim
20 words
A composition of matter according to claim 3 wherein said polyhalo-substituted cyclic compound is selected from the group consisting of:
Claim 4
Dependent Claim
15 words
A composition of matter according to claim 4 wherein said rate accelerator is zinc oxide.
Claim 5
Dependent Claim
32 words
A composition of matter according to claim 4 wherein said cyclic compound is p-dichlorobenzene, said alkali metal sulfide is sodium sulfide, and said rate accelerator is a mixture of 2-mercaptobenzothiazole and benzothiazyldisulfide.
Claim 6
Dependent Claim
22 words
A composition of matter according to claim 5 wherein said cyclic compound is p-dichlorobenzene, and said alkali metal sulfide is sodium sulfide.
Claim 7
Dependent Claim
192 words
A process for the production of processable thermoplastic poly(arylene sulfide) polymers which comprises heating at an elevated temperature a mixture consisting essentially of: a. poly(arylene sulfide) polymer, and b. an effective amount of an admixture consisting essentially of sulfur and a melt flow modifier rate accelerator; wherein said rate accelerator is selected from the group consisting of zinc oxide, ferric oxide, N-oxydiethylene benzothiazole-2-sulfenamide, benzothiazyl disulfide, 2-mercaptobenzothiazole, and mixtures thereof; wherein the amount of said sulfur is in the range of 1.5 to about three parts by weight per 100 parts by weight of poly(arylene sulfide), the amount of said rate accelerator is in the range of two to about five parts by weight of poly(arylene sulfide), and the weight ratio of sulfur to rate flow accelerator is in the range of 1:1.3 to 1:3.3; and wherein said heating is effected at a temperature in the range of about 25* F. to about 350* F. above the melt point of said poly(arylene sulfide); whereby there is obtained a processable thermoplastic poly(arylene sulfide) polymer composition characterized by a significantly reduced melt flow in comparison to poly(arylene sulfide) polymer containing no sulfur and rate accelerator.
Claim 8
Dependent Claim
28 words
A process according to claim 8 wherein said mixture is heated at a temperature above the melt point of said poly(arylene sulfide) for from 0.5 to 15 minutes.
Claim 9
Dependent Claim
13 words
A process according to claim 9 wherein said rate accelerator is zinc oxide.
Claim 10
Dependent Claim
54 words
A process according to claim 9 wherein said poly(arylene sulfide) comprises the reaction product formed by contacting at least one polyhalo-substituted cyclic compound containing unsaturation between adjacent ring atoms and wherein the halogen atoms are attached to ring carbon atoms with an alkali metal sulfide in a polar organic solvent at an elevated temperature.
Claim 11
Dependent Claim
18 words
A process according to claim 11 wherein said polyhalo-substituted cyclic compound is selected from the group consisting of:
Claim 12
Dependent Claim
13 words
A process according to claim 12 wherein said rate accelerator is zinc oxide.
Claim 13
Dependent Claim
29 words
A process according to claim 12 wherein said temperature is in the range of about 50* F. to about 275* F. above the melt point of said poly(arylene sulfide).
Claim 14
Dependent Claim
30 words
A process according to claim 12 wherein said cyclic compound is p-dichlorobenzene, said alkali metal sulfide is sodium sulfide, and said rate accelerator is a mixture of 2-mercaptobenzothiazole and benzothiazyldisulfide.
Claim 15
Dependent Claim
20 words
A process according to claim 13 wherein said cyclic compound is p-dichlorobenzene and said alkali metal sulfide is sodium sulfide.
References Cited (Backward Citations)
US3458486A
Cited
US3487052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |