US4371671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled, elevated pressure dehydration of poly(arylene sulfide) prepolymerization mixture
Assignee: Phillips Petroleum Co
•
Filing: 1981-09-01
•
Granted: 1983-02-01
•
Expires: 2001-09-01
Abstract
Abstract A method for dehydrating pre-polymerization mixtures in the preparation of poly(arylene sulfide) in which a reaction mixture of a sulfur source and an organic amide are contacted at an essentially constant pressure within a range of about 4 psig to about 40 psig and a first temperature in a range of about 300° F. to 400° F. to form a complex of the reactants with the mixture subsequently maintained at essentially constant pressure while elevating the temperature to a second temperature at which, at the chosen pressure, essentially all water is removed from the mixture. Other compounds including bases, alkali metal carboxylates, alkali metal carbonates, lithium halides, and lithium borate can be present in the reaction mixture. Preferably the sulfur source is sodium sulfide and the organic amide is N-methylpyrrolidone.
Inventors
- 👤 Kenneth L. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:58
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/025; C08G75/0231
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A method in the preparation of poly(arylene sulfide) for dehydrating pre-polymerization mixtures comprising a reaction mixture of a sulfur source and an organic amide, said method comprising: (a) contacting a reaction mixture comprising a sulfur source and an organic amide at an essentially constant pressure within a range of about 4 psig to about 40 psig and a first temperature in the range of about 300° F. to about 400° F. for a time sufficient for formation of a complex of the reactants, and subsequently (b) maintaining the essentially constant pressure while over a period of time raising the temperature to a second temperature, at which, at said essentially constant pressure, essentially all water is removed from the mixture.
Claim 2
Independent Claim
119 words
A method in the preparation of poly(arylene sulfide) for dehydrating pre-polymerization mixtures comprising a reaction mixture of a sulfur source and an organic amide, said method comprising: (a) contacting a reaction mixture comprising a sulfur source and an organic amide at an essentially constant pressure within a range of about 4 psig to about 40 psig and a first temperature in the range of about 300° F. to about 400° F. for a time sufficient for formation of a complex of the reactants, and subsequently (b) maintaining the essentially constant pressure while over a period of time raising the temperature to a second temperature, at which, at said essentially constant pressure, essentially all water is removed from the mixture.
Claim 3
Dependent Claim
22 words
A method of claim 1 in which said second temperature is in a range of about 400° F. to about 500° F.
Claim 4
Dependent Claim
36 words
A method of claim 2 in which said pressure is in a range of about 13 to about 21 psig and said second temperature is in a range of about 430° F. to about 480° F.
Claim 5
Dependent Claim
26 words
A method of claim 1, 2, or 3 in which said sulfur source is chosen from among alkali metal sulfides and the organic amide is N-methyl-pyrrolidone.
Claim 6
Dependent Claim
38 words
A method of claim 1, 2, or 3 wherein additional compounds are present in the reaction mixture, said compounds chosen from among the group consisting of bases, alkali metal carboxylates, alkali metal carbonates, lithium halides, and lithium borate.
Claim 7
Dependent Claim
35 words
A method of claim 4 wherein additional compounds are present in the reaction mixture said compounds chosen from among the group consisting of bases, alkali metal carboxylates, alkali metal carbonates, lithium halides, and lithium borate.
Claim 8
Dependent Claim
12 words
A method of claim 4 wherein said sulfur source is sodium sulfide.
Claim 9
Dependent Claim
18 words
A method of claim 6 wherein said sulfur source is sodium sulfide and sodium acetate is also present.
Claim 10
Dependent Claim
31 words
A method for preparing polymers in which a dehydrated pre-polymerization mixture produced by the method of claim 1,2, or 3 is contacted under polymerization conditions with at least one polyhalo-substituted compound.
Claim 11
Dependent Claim
29 words
A method for preparing polymers in which a dehydrated pre-polymerization mixture produced by the method of claim 4 is contacted under polymerization conditions with at least one polyhalo-substituted compound.
Claim 12
Dependent Claim
29 words
A method for preparing polymers in which a dehydrated pre-polymerization mixture produced by the method of claim 6 is contacted under polymerization conditions with at least one polyhalo-substituted compound.
Claim 13
Dependent Claim
29 words
A method for preparing polymers in which a dehydrated pre-polymerization mixture produced by the method of claim 8 is contacted under polymerization conditions with at least one polyhalo-substituted compound.
References Cited (Backward Citations)
US3354129A
Cited
US3867356A
Cited
US3919177A
Cited
US4038262A
Cited
US4038263A
Cited
US4038259A
Cited
US4039518A
Cited
US4064114A
Cited
US4025496A
Cited
US4056515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |