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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12790439 B1

PDFFull Text
Date of Patent:
Nov. 10, 2026

Filed:

Aug. 26, 2021

Crosslinked polyarylene sulfide, composition, and method for producing molded article

Applicant:

Dic Corporation, Tokyo, JP;

Inventors:

Chikara Funahashi, Ichihara, JP;

Hideki Watanabe, Ichihara, JP;

Takashi Furusawa, Ichihara, JP;

Assignee:

DIC Corporation, Tokyo, JP;

Attorneys:

Troutman Pepper Locke LLP

James E. Armstrong, IV

Tanya Leavy

Primary Examiner:

Margaret G Moore

Int. Cl.
CPC ...
C08G 75/0277 (2016.01); B29B 9/12 (2006.01); C08G 75/0259 (2016.01); C08J 3/12 (2006.01); C08J 3/24 (2006.01); B29B 9/04 (2006.01); B29K 81/00 (2006.01); B29K 105/04 (2006.01); B29K 105/24 (2006.01);
U.S. Cl.
CPC ...
C08G 75/0277 (2013.01); B29B 9/12 (2013.01); C08G 75/0259 (2013.01); C08J 3/12 (2013.01); C08J 3/24 (2013.01); B29B 9/04 (2013.01); B29K 2081/00 (2013.01); B29K 2105/04 (2013.01); B29K 2105/24 (2013.01); C08J 2381/02 (2013.01);
Abstract

An object of the present invention is to provide a method for producing a crosslinked polyarylene sulfide (PAS) that reduces a difference in melt viscosity among lots and has excellent quality stability. Further specifically, the present invention provides a method for producing a crosslinked PAS including steps of compression-molding an uncrosslinked PAS in a powder form to obtain a compression-molded material, measuring a porosity of the compression-molded material, grinding the compression-molded product having a specific range of porosity to obtain a pulverized material, granulating the pulverized material to obtain a granulated material, and oxidatively crosslinking the granulated material obtained in the preceding step. Also provided are a method for producing a composition containing the crosslinked PAS, and a method for producing a molded article by melt-molding the composition.

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Funahashi, Chikara. (2026). Crosslinked polyarylene sulfide, composition, and method for producing molded article (U.S. Patent No. 12790439). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12790439

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