High heat distortion resistant segment ester polycarbonates
AssigneeGeneral Electric Company
InventorsVictor Mark, Frederick F. Holub, Charles V. Hedges
Life of this patent
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Abstract
Segment-ester polycarbonates have improved resistance to high heat distortion when portions of the polymer contain units derived from 4,4'-cyclohexylidenediphenol and derivatives thereof. Preferred high heat distortion segment-ester polycarbonates include the copolyestercarbonate with segments derived from isophthalic acid and 4,4'-cyclohexylidenediphenol and/or terephthalic acid and 4,4'-cyclohexylidenediphenol. Films made of the segment-ester copolycarbonates have improved resistance to high heat distortion.
Claims16
A high molecular weight segment-ester polycarbonate composition comprising aromatic carbonate units and aromatic diester units, said units derived from cyclic bisphenols and said units having the general formulae I and II respectively, the molar ratio of said aromatic carbonate units to aromatic diester units being from about 1:9 to about 9:1, and mixtures thereof:
- ##STR4## wherein X is independently selected from the group consisting of hydrogen, halogen and alkyl radical;
- Y, Y.sub.2, Y.sub.3 and Y.sub.4 are the same or different and is an alkyl radical;
- m, o, p and q are the same or different and is 0, 1 or 2;
- n is an integer from 1 to 4;
- r is an integer from 2 to about 20.
Dependencies are inferred from the claim text.