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US 5,212,282 AGranted
Process for preparing random copolycarbonate from dianion of ortho-substituted dihydric phenol
AssigneeThe Dow Chemical Company
InventorsMaurice J. Marks, Thoi H. Ho
Life of this patent
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Abstract
A process for preparation of a random copolycarbonate from an ortho-substituted dihydric phenol and a non-ortho-substituted dihydric phenol.
Claims16
An interfacial process for the preparation of a random copolycarbonate comprising
- (a) contacting the dianion of an ortho-substituted dihydric phenol with a carbonate precursor to form the bis(carbonate precursor)ester of the ortho-substituted dihydric phenol,
- (b) contacting the bis(carbonate precursor)ester with the dianion of a non-ortho-substituted dihydric phenol to form a random carbonate oligomer,
- (c) contacting the random carbonate oligomer with a carbonate precursor to form a random copolycarbonate, and
- (d) recovering the random copolycarbonate.
1 more element
Dependencies are inferred from the claim text.