Process of crosslinking polycyclic oligomer from tetraphenal
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United States of America Patent
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Nov 20, 1990
Issued Date -
N/A
app pub date -
Sep 11, 1989
filing date -
Nov 25, 1985
priority date (Note) -
Expired
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Abstract
Polycyclic polycarbonate (or thiol analog) oligomers are prepared from a mixture of at least one bishaloformate with at least one tetraphenol, or thio analogs thereof. Such mixture may also contain at least one dihydroxy or dimercapto compound. The oligomers are formed by the reaction of such mixtures with alkali metal hydroxides and various amines. The polycyclic oligomer mixtures may be converted to crosslinked polycarbonates or their thiol analogs.
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