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.:
Date of Patent:
Mar. 07, 2023
Filed:
Oct. 24, 2017
Applicant:
Sumitomo Chemical Company, Limited, Tokyo, JP;
Inventor:
Kazuyuki Ito, Tsukuba, JP;
Assignee:
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G 75/20 (2016.01); C08K 3/013 (2018.01); C08K 3/04 (2006.01); C08K 3/34 (2006.01); C08K 3/40 (2006.01); C08K 7/06 (2006.01); C08K 7/10 (2006.01); C08K 7/14 (2006.01); C08G 65/40 (2006.01);
U.S. Cl.
CPC ...
C08G 75/20 (2013.01); C08G 65/40 (2013.01); C08K 3/013 (2018.01); C08K 3/04 (2013.01); C08K 3/34 (2013.01); C08K 3/40 (2013.01); C08K 7/06 (2013.01); C08K 7/10 (2013.01); C08K 7/14 (2013.01);
Abstract
A method for producing an aromatic polysulfone by a polycondensation reaction between an aromatic dihalogenosulfone compound and an aromatic dihydroxy compound is described. The polycondensation reaction is performed in the presence of at least one aromatic end-capping agent; and an amount, p mol, of the aromatic dihalogenosulfone compound, an amount, q mol, of the aromatic dihydroxy compound, and an amount, r mol, of the aromatic end-capping agent have a relationship satisfying formula (S1) below and formula (S2) below:()<2   (S1), andp>q   (S2).