US3839301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(arylene sulfide) resin heat treatment and curing
Assignee: Phillips Petroleum Co
•
Filing: 1973-07-23
•
Granted: 1974-10-01
•
Expires: 1993-07-23
Abstract
Abstract The processing characteristics of poly(arylene sulfide) resins are improved by incorporating therein a small effective amount of at least one sulfur-containing compound selected from sulfur acids and sulfonyl halides and heating at a temperature below the melting point of the polymer under an inert atmosphere. The aromatic sulfide polymers treated in accordance with the invention retain their thermoplastic nature and can be used in a variety of industrial applications, e.g., as molding compositions.
Inventors
- 👤 L Scoggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:26
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A HEAT CURABLE POLY(ARYLENE SULFIDE) RESIN COMPOSITION CAPABLE OF BEING CURED TO A MATERIAL EXHIBITING REDUCED MELT FLOW CHARACTERSITICS COMPRISING A MIXTURE OF A POLY(ARYLENE SULFIDE) RESIN AND AN EFFECTIVE AMOUNT SUFFICIENT TO SUBSTANTIALLY REDUCE THE MELT FLOW AND EFFECT CURE OF SAID RESIN OF AT LEAST ONE SULFUR-CONTAINING COMPOUND SELECTED FROM SULFURIC ACID, POLY SULFONIC ACIDS AND POLY SULFONYL HALIDES.
Claim 2
Dependent Claim
61 words
A HEAT CURABLE POLY(ARYLENE SULFIDE) RESIN COMPOSITION CAPABLE OF BEING CURED TO A MATERIAL EXHIBITING REDUCED MELT FLOW CHARACTERSITICS COMPRISING A MIXTURE OF A POLY(ARYLENE SULFIDE) RESIN AND AN EFFECTIVE AMOUNT SUFFICIENT TO SUBSTANTIALLY REDUCE THE MELT FLOW AND EFFECT CURE OF SAID RESIN OF AT LEAST ONE SULFUR-CONTAINING COMPOUND SELECTED FROM SULFURIC ACID, POLY SULFONIC ACIDS AND POLY SULFONYL HALIDES.
Claim 3
Dependent Claim
24 words
A composition according to claim 1 wherein the sulfur-containing compound is sulfuric acid or a polysulfonic acid or a polysulfonyl halide of the formula
Claim 4
Dependent Claim
27 words
A composition according to claim 1 wherein the amount of said sulfur-containing compound in said composition ranges from 0.1 to about 10 weight percent of the polymer.
Claim 5
Dependent Claim
19 words
A composition according to claim 1 wherein said polymer is poly(phenylene sulfide) and said sulfur-containing compound is sulfuric acid.
Claim 6
Dependent Claim
19 words
A composition according to claim 1 wherein said polymer is poly(phenylene sulfide) and said sulfur-containing compound is m-benzenedisulfonic acid.
Claim 7
Dependent Claim
14 words
A cured poly(arylene sulfide) resin product formed upon heating the composition of claim 1.
Claim 8
Dependent Claim
11 words
A molded product formed from the cured composition of claim 6.
Claim 9
Dependent Claim
122 words
A process for decreasing the melt flow of poly (arylene sulfide) resins which comprises: a. mixing together a particulate poly(arylene sulfide) resin and at least one sulfur-containing compound selected from sulfuric acid, polysulfonic acids and polysulfonyl halides as a curing agent, the amount of said sulfur-containing compound present being sufficient to substantially reduce the melt flow and effect cure of said resin, and b. subjecting the mixture of said resin and said sulfur-containing compound obtained in step (a) to a temperature high enough to effect curing but at least 25* below the melting point of said resin for a period of time sufficient to crosslink said resin and form a free-flowing cured particulate poly(arylene sulfide) resin product exhibiting reduced melt flow characteristics.
Claim 10
Dependent Claim
122 words
A process for decreasing the melt flow of poly (arylene sulfide) resins which comprises: a. mixing together a particulate poly(arylene sulfide) resin and at least one sulfur-containing compound selected from sulfuric acid, polysulfonic acids and polysulfonyl halides as a curing agent, the amount of said sulfur-containing compound present being sufficient to substantially reduce the melt flow and effect cure of said resin, and b. subjecting the mixture of said resin and said sulfur-containing compound obtained in step (a) to a temperature high enough to effect curing but at least 25* below the melting point of said resin for a period of time sufficient to crosslink said resin and form a free-flowing cured particulate poly(arylene sulfide) resin product exhibiting reduced melt flow characteristics.
Claim 11
Dependent Claim
61 words
A process according to claim 8 wherein the temperature to which said mixture is heated is in the approximate range of 25* to 250*F below the melting point of the polymer and said heating is carried out in the presence of a non-oxidizing inert atmosphere for a finite period of time sufficient to substantially reduce the melt flow of said polymer.
Claim 12
Dependent Claim
54 words
A process according to claim 8 wherein the resin and sulfur-containing compound in step (a) are dispersed in an aqueous medium which medium is subsequently removed by evaporation at a temperature of at least 25*F below the melting point of said resin but at conditions insufficient to effect any substantial cure of the resin.
References Cited (Backward Citations)
US3562199A
Cited
US3699087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |