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:
Jun. 07, 2016
Filed:
Oct. 10, 2013
Idemitsu Kosan Co., Ltd., Chiyoda-ku, JP;
IDEMITSU KOSAN CO., LTD., Chiyoda-ku, JP;
Abstract
Provided is a method for economically and stably producing a high-quality polycarbonate-polyorganosiloxane copolymer excellent in, for example, transparency and impact resistance in a continuous manner. Specifically, provided is a method of continuously producing a polycarbonate-polyorganosiloxane copolymer, the method including a step (A) of continuously or intermittently taking a polymerization reaction liquid, which is obtained by polymerizing a dihydric phenol-based compound, a carbonate precursor, and a polyorganosiloxane in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent, out of a reactor, the step (A) including the following step (a-1) and the following step (a-2), the method using a dissolution tank for dissolving the dihydric phenol-based compound in the alkaline compound aqueous solution to prepare an alkaline compound aqueous solution of the dihydric phenol-based compound to be used in each of both the step (a-1) and the step (a-2), the step (a-2) including, before mixing a polycarbonate oligomer and the dihydric phenol-based compound, mixing the alkaline compound aqueous solution and the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank: step (a-1): a step of mixing the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank and the polycarbonate precursor, followed by a reaction of the mixture in the presence of the water-insoluble organic solvent to produce the polycarbonate oligomer; and step (a-2): a step of continuously or intermittently taking the polymerization reaction liquid, which is obtained by mixing the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank, the polycarbonate oligomer obtained in the step (a-1), and the polyorganosiloxane, and polymerizing the mixture in the presence of the water-insoluble organic solvent, out of the reactor.