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AssigneeBayer Aktiengesellschaft
InventorsDieter Freitag, Uwe Westeppe, Claus H. Wulff, Karl-Herbert Fritsch, Carl Casser, Gunther Weymans, Lutz Schrader, Werner Waldenrath
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Dihydroxydiphenyl cycloalkanes corresponding to the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl and C.sub.7 -C.sub.12 aralkyl, m is an integer of from 4 to 7, R.sup.3 and R.sup.4, individually selectable for each X, independently of one another represent hydrogen or C.sub.1 -C.sub.6 alkyl and X represents carbon with the proviso that, at least one atom X, both R.sup.3 and R.sup.4 are alkyl, a process for their production, their use for the production of high molecular weight polycarbonates, the polycarbonates made from dihydroxydiphenyl cycloalkane of formula (I) and films made from these polycarbonates.
A process for the production of high molecular weight aromatic polycarbonates comprising reacting phosgene or diphenyl carbonate with at least one diphenol having the formula ##STR16## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.5 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
A process for the production of high molecular weight aromatic polycarbonates comprising reacting phosgene with at least one diphenol having the formula ##STR17## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen,
Dependencies are inferred from the claim text.