Polycarbonate preparation method
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United States of America Patent
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Jun 23, 2015
Grant Date -
Nov 27, 2014
app pub date -
Nov 5, 2012
filing date -
Nov 18, 2011
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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.
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