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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 9988490 B1

PDFFull Text
Date of Patent:
Jun. 05, 2018

Filed:

May. 28, 2015

Method for producing polycarbonate

Applicant:

Idemitsu Kosan Co., Ltd., Tokyo, JP;

Inventors:

Yukiko Nagao, Tokyo, JP;

Masayuki Takahashi, Taipei, TW;

Kota Mabuchi, Narashino, JP;

Assignee:

IDEMITSU KOSAN CO., LTD., Tokyo, JP;

Attorney:

Foley & Lardner LLP

Primary Examiner:

Terressa Boykin

Int. Cl.
CPC ...
C08G 64/00 (2006.01); C08G 64/16 (2006.01); C08J 3/12 (2006.01); C08G 64/40 (2006.01); B29B 9/12 (2006.01); B29K 69/00 (2006.01); B29K 105/00 (2006.01);
U.S. Cl.
CPC ...
C08G 64/1608 (2013.01); B29B 9/12 (2013.01); C08G 64/406 (2013.01); C08J 3/12 (2013.01); B29K 2069/00 (2013.01); B29K 2105/251 (2013.01); C08J 2369/00 (2013.01);
Abstract

Provided is a method of producing a polycarbonate that enables efficient drying of a polycarbonate powder and has no risk of deteriorating the quality of a polycarbonate molded article to be obtained. The method of producing a polycarbonate includes: a step of causing an alkali aqueous solution of a dihydric phenol and phosgene to react with each other in the presence of an organic solvent to produce an organic solvent solution containing a polycarbonate; a powdering step of powdering the organic solvent solution containing the polycarbonate to provide a polycarbonate powder; and a pre-drying step of drying the polycarbonate powder to remove the remaining organic solvent, in which a drying temperature in the pre-drying step is set to a temperature lower than the glass transition temperature of the polycarbonate containing 1.5 mass % of the organic solvent by from 5° C. to 15° C.

Find Patent Forward Citations

Nagao, Yukiko. (2018). Method for producing polycarbonate (U.S. Patent No. 9988490). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9988490

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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