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US 5,393,865 AGranted
Poly(arylene sulfide) fibrid particles and process for their preparation
AssigneePhillips Petroleum Company
InventorsCarlton E. Ash, Harold D. Yelton, Owen H. Decker, Jon F. Geibel
Life of this patent
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Abstract
A method is provided for forming poly(arylene sulfide) fibrids by flashing a solution which is comprised of a poly(arylene sulfide) polymer in a polar organic compound and which is essentially free of solids under suitable conditions to form a solidified product comprising poly(arylene sulfide) fibrids.
Claims25
A process comprising:
- flashing in a flash zone a solution which is comprised of a poly(arylene sulfide) in a polar organic compound selected from the group consisting essentially of organic amides, high boiling alcohols, ethers, ketones, sulfones and mixtures thereof and which is essentially free of solids under conditions suitable to separate the solution into a vaporized polar organic compound which is removed from said flash zone and a solidified product comprising poly(arylene sulfide) fibrids.
A process comprising:
- forming a solution comprising a poly(arylene sulfide) in a polar organic compound selected from the group consisting essentially of organic amides, high boiling alcohols, ethers, ketones, sulfones and mixtures thereof under a first pressure sufficient to keep the liquids present in a liquid phase and wherein said solution is essentially free of any solids;
- flashing said solution to a second pressure, lower than said first pressure, and to a temperature, lower than the melting point of said poly(arylene sulfide) so that a major portion of said polar organic compound is vaporized and a solidified product comprising poly(arylene sulfide) fibrids is formed.
A process comprising:
- forming a solution of a poly(arylene sulfide) in a polar organic compound selected from the group consisting essentially of organic amides, high boiling alcohols, ethers, ketones, sulfones and mixtures thereof in a first zone under a first pressure sufficient to keep the liquids present in a liquid phase and wherein said first zone is essentially free of any solids;
- and
- transferring a portion of said solution to a second zone wherein said zone is at a temperature below the melting point of said poly(arylene sulfide) and is at a second pressure below said first pressure so that a major portion of said polar organic compound is vaporized and a solidified product comprising poly(arylene sulfide) fibrids is formed.
A process comprising:
- (a) forming a poly(arylene sulfide) in a polymerization reactor;
- (b) removing from said polymerization reactor an effluent containing said poly(arylene sulfide), solids and a polar organic compound selected from the group consisting essentially of organic amides, high boiling alcohols, ethers, ketones, sulfones and mixtures thereof;
- (c) recovering said poly(arylene sulfide) from said polymer effluent in a solidified form;
- (d) removing from said poly(arylene sulfide) any residual solids to obtain a cleansed poly(arylene sulfide);
- (e) dissolving said cleansed poly(arylene sulfide) in a polar organic compound to form a polymer solution;
- and
- (f) flashing at least a portion of said polymer solution under suitable conditions to obtain a solidified product comprising poly(arylene sulfide) fibrids.
4 more elements
Dependencies are inferred from the claim text.