Process for preparing branched polycarbonates by solid state polymerization
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United States of America Patent
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Jan 20, 1998
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N/A
app pub date -
May 24, 1996
filing date -
Dec 29, 1995
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Expired
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Abstract
This invention involves a novel process for preparing branched polycarbonates employing a solid state polycondensation process; specifically, subjecting a linear crystallized oligomer derived from dihydroxydiaryl compound and a diaryl carbonate to solid state polycondensation process by heating the said oligomer at a temperature which is higher than the glass transition temperature but below its melting point in the presence of a multifunctional phenol and an alkali or alkaline metal salt or bisphenol or tetraalkylammonium hydroxide, carboxylate or bicarboxylate catalyst, the reaction being effected under inert atmosphere.
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