Polycarbonates having improved hydrolytic stability
AssigneeUnion Carbide Corporation
InventorsJames H. Kawakami, James E. Harris, Louis M. Maresca, Lloyd M. Robeson, Robert J. Cotter
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Abstract
This invention relates to moldable polycarbonate compositions and in particular to moldable polycarbonates which have ordered alternating repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl)sulfone (TMBS) and 2,2-bis-(4-hydroxyphenyl)propane (Bisphenol A) dihaloformate, or ordered, alternating repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl) sulfone (TMBS) dihaloformate and a bisphenol compound such as 2,2-bis-(4-hydroxyphenyl)propane (Bisphenol A). Such polycarbonates exhibit improved hydrolytic stability and also excellent processability in molding applications.
Claims16
A composition comprising a polycarbonate containing ordered, alternating repeating units having the formula ##STR22## in an amount sufficient to enhance hydrolytic stability of the polycarbonate, wherein Y is selected from alkyl groups of 1 to 4 carbon atoms, chlorine or bromine, each z, independently, has a value of from 0 to 4 inclusive, n has a value of 0 or 1, R.sub.1 is a divalent saturated or unsaturated hydrocarbon radical, O, CO, SO.sub.2, S or a direct bonds, with the proviso that when R.sub.1 is SO.sub.2 then the subunit having the formula ##STR23## is not the same as the subunit having the formula ##STR24## and wherein the polycarbonate has a reduced viscosity of at least about 0.3 dl/g as measured in chloroform at a concentration of 0.5 g/100 ml at 25.degree. C.
A process for preparing a polycarbonate comprising ordered, alternating repeating units having the formula ##STR27## in an amount sufficient to enhance hydrolytic stability of the polycarbonate, wherein Y is selected from alkyl groups of 1 to 4 carbon atoms, chlorine or bromine, each z, independently, has a value of from 0 to 4 inclusive, n has a value of 0 or 1, R.sub.1 is a divalent saturated or unsaturated hydrocarbon radical, O, CO, SO.sub.2, S or a direct bond, with the proviso that when R.sub.1 is SO.sub.2 then the subunit having the formula ##STR28## is not the same as the subunit having the formula ##STR29## and wherein the polycarbonate has a reduced viscosity of at least about 0.3 dl/g as measured in chloroform at a concentration of 0.5 g/100 ml at 25.degree. C., which process comprises reacting a compound having the formula ##STR30## wherein Y, z, n and R.sub.1 are as defined above and X is halogen, and a bisphenol compound having the formula ##STR31## in amounts sufficient to form the polycarbonate.
A process for preparing a polycarbonate comprising ordered, alternating repeating units having the formula ##STR32## in an amount sufficient to enhance hydrolytic stability of the polycarbonate, wherein Y is selected from alkyl groups of 1 to 4 carbon atoms, chlorine or bromine, each z, independently, has a value of from 0 to 4 inclusive, n has a value of 0 or 1, R.sub.1 is a divalent saturated or unsaturated hydrocarbon radical, O, CO, SO.sub.2, S or a direct bond, with the proviso that when R.sub.1 is SO.sub.2 then the subunit having the formula ##STR33## is not the same as the subunit having the formula ##STR34## and wherein the polycarbonate has a reduced viscosity of at least about 0.3 dl/g as measured in chloroform at a concentration of 0.5 g/100 ml at 25.degree. C. which process comprises reacting a compound having the formula ##STR35## wherein X is halogen, and a bisphenol compound having the formula ##STR36## wherein Y, z, n and R.sub.1 are as defined above, in amounts sufficient to form the polycarbonate.
Dependencies are inferred from the claim text.