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. 23, 2015
Filed:
Nov. 05, 2012
Wanhua Chemical Group Co., Ltd., Yantai, Shandong, CN;
Wanhua Chemical (Ningbo) Co., Ltd., Ningbo, Zhejiang, CN;
Lei Zhang, Shandong, CN;
Hongke Zhang, Shandong, CN;
Weiqi Hua, Shandong, CN;
Linrong Song, Shandong, CN;
Yifeng Hu, Shandong, CN;
Xiwang Zang, Shandong, CN;
Kai Feng, Shandong, CN;
WANHUA CHEMICAL GROUP CO., LTD., Yantai, Shandong, CN;
Abstract
Provided is a polycarbonate preparation method, comprising the following steps: a) mixing a phenoxide water aqueous solution of a bisphenol and/or a polyphenol with a phosgene and an inert organic solvent, reacting, and generating a polycarbonate oligomer; b) highly emulsifying the oligomer by reinforced micromixing to form a stable emulsion; and c) introducing the emulsion into a polycondensation reactor for a chain extending reaction, separating and finally obtaining the polycarbonate. Through the reinforced micromixing, the present method can prepare the high-molecular-weight polycarbonate without any catalysts, thus simplifying the post-treatment process of the product and improving product quality.