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:
Aug. 11, 2020
Filed:
Dec. 05, 2018
Applicant:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Inventors:
Yukiko Nagao, Tokyo, JP;
Toshiyuki Yasuda, Sodegaura, JP;
Assignee:
IDEMITSU KOSAN CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/08 (2006.01); C08G 64/18 (2006.01); C08G 77/06 (2006.01); C08G 77/448 (2006.01); C08G 64/24 (2006.01);
U.S. Cl.
CPC ...
C08G 64/085 (2013.01); C08G 64/18 (2013.01); C08G 64/186 (2013.01); C08G 64/24 (2013.01); C08G 77/06 (2013.01); C08G 77/448 (2013.01);
Abstract
Provided is a method of producing a polycarbonate-polyorganosiloxane copolymer, including a step (a) of producing a polycarbonate oligomer with an alkaline aqueous solution of a dihydric phenol, phosgene, and an organic solvent, the method further including a step of setting a content of a polycarbonate-polyorganosiloxane copolymer in the organic solvent to be introduced into the step (a) to less than 850 ppm by mass.