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US 4,900,803 AGranted
Branched polycarbonate from tri- or tetra-hydroxy biphenyl compounds
AssigneeEnichem Tecnoresine S.p.A.
InventorAlberto Petri
Life of this patent
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Abstract
Branched, thermoplastic polycarbonates, suitable for being processed according to the blow-molding technique, are prepared by copolymerization with tri- or tetra-hydroxy biphenyl compounds.
Claims3
A blow moldable branched polycarbonate derived from (1) an aromatic dihydroxy-compound and a carbonate precursor and (2) at least one tri- or tetra-hydroxy biphenyl compound having the formula:
- ##STR3## wherein:
- Z represents O, --CH.sub.2 --;
- R, R.sub.1, R.sub.2, are either the same or are different from, one another, and represent H, OH or CH.sub.3, and at least one thereof is OH;
- and
- R.sub.3 represents H, CH.sub.3.
2 more elements
Dependencies are inferred from the claim text.