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:
Feb. 03, 2026
Filed:
Dec. 07, 2020
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Minoru Yabukami, Ichihara, JP;
Shinobu Yamao, Ichihara, JP;
IDEMITSU KOSAN CO., LTD., Tokyo, JP;
Abstract
Provided is a polycarbonate-polyorganosiloxane copolymer, which is produced by using a diol monomer (a1) and a polyorganosiloxane (a2) satisfying the following condition, including: a polyorganosiloxane block (A-1) including a specific repeating unit; and a polycarbonate block (A-2) formed of a specific repeating unit: a mixture, which is obtained by bringing the diol monomer (a1), the polyorganosiloxane (a2), a carbonic acid diester, and a basic catalyst present at the same amount ratio as that at a time of production of the polycarbonate-polyorganosiloxane copolymer into contact with each other at from 100° C. to 250° C. for from 0.5 hour to 5 hours, has a haze value of 30 or less measured under conditions of 23° C. and an optical path length of 10 mm in conformity with ISO 14782:1999.