Method for manufacturing polycarbonate for optical use
First Claim
1. A method for manufacturing an optical polycarbonate, by the melt polycondensation of a bisphenol and a carbonic diester, whereina molten mixture of a bisphenol and a carbonic diester is first filtered through a membrane filter made of a fluororesin, and melt polycondensation is subsequently conducted.
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Accused Products
Abstract
The specification provides a method for the manufacture of a high-quality optical polycarbonate that contains few inorganic or organic impurities or other microparticles, and that has a superior hue. Specifically, the specification provides a method for the manufacture of a polycarbonate by the melt polycondensation of a bisphenol and a carbonic diester, wherein the molten mixture of a bisphenol and a carbonic diester is filtered with a membrane filter made of a fluororesin, after which melt polycondensation is conducted.
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Citations
7 Claims
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1. A method for manufacturing an optical polycarbonate, by the melt polycondensation of a bisphenol and a carbonic diester, wherein
a molten mixture of a bisphenol and a carbonic diester is first filtered through a membrane filter made of a fluororesin, and melt polycondensation is subsequently conducted.
Specification