Abstract:
Novel keto-diphenol compounds are disclosed. These compounds are intermediates in the production of novel tetraphenolic compounds which have utility as branching agents in the production of novel, randomly branched polycarbonates.
Abstract:
Improved flame retardance and improved water vapor transmission are imparted to high molecular weight aromatic polycarbonate resins by selecting appropriate diphenols and controlling the degree to which these particular diphenols are halogenated.
Abstract:
Novel heat resistant polycarbonates are provided which are the polymerized reaction products of:(i) a carbonate precursor; and(ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae ##STR1## wherein: each R.sup.1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;each R.sup.2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals;R.sup.4 and R.sup.5 are independently selected from monovalent hydrocarbon radicals;R.sup.3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R.sup.3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R.sup.4 and R.sup.5 contains at least two carbon atoms;R.sup.7 is selected from hydrogen and monovalent hydrocarbon radicals;R.sup.6 is a divalent hydrocarbon radicals; andn and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.
Abstract:
Linear thermoplastic polycarbonates derived from:(i) a carbonate precursor; and(ii) at least one dihydric phenol represented by the general formula ##STR1## wherein R is independently selected from hydrogen and lower alkyl radicals,X is selected from monocyclic cycloalkylidene radicals containing from 8 to about 16 ring carbon atoms, andn and n' are independently selected from whole numbers having a value of from 0 to 2 inclusive, with the proviso that the sum of n plus n' is at least one.
Abstract:
Thermoplastic polymer exhibiting improved heat resistance comprised of the polymerized reaction products of (i) a carbonate precursor, and (ii) at least one dihydric phenol represented by the general formula ##STR1## wherein: R is independently selected from alkyl radicals;R.sup.1 is independently selected from monovalent hydrocarbon radicals;X is selected from cycloalkylidene radicals containing from 8 to about 16 ring carbon atoms;each n is two; andm represents a whole number having a value of from 0 up to the number of replaceable hydrogen atoms present on X.
Abstract:
Polyarylate resin compositions exhibiting flame retardancy comprised of at least one polyarylate resin derived from:(i) at least one aromatic dicarboxylic acid or a reactive derivative thereof; and(ii) from about 1 to 100 weight percent of at least one thiodiphenol and from 0 to about 99 weight percent of at least one dihydric phenol, based on the total amount of thiodiphenol and dihydric phenol.
Abstract:
Polyarylate resins derived from (i) an aromatic dicarboxylic acid; and (ii) a branched alkylidene dihydric phenol, wherein branching occurs on a carbon atom of the alkylidene radical which is at least one carbon atom removed from the benzylic carbon atom bridging the two phenolic residues.
Abstract:
Fluorinated bisphenols having a fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are prepared at atmospheric pressure or at low pressures from a phenol reactant and a fluorinated aldehyde compound in the presence of gaseous hydrogen chloride or gaseous hydrogen bromide catalyst. The fluroinated bisphenols having the fluorinated alkyl group and a hydrogen atom upon the methylene carbon atom are produced in excellent yields and are used for making flame-retardant polycarbonates and polyester-carbonate copolymers.
Abstract:
Polycarbonate compositions having improved barrier properties; i.e., low water vapor transmission and low gas permeability, are obtained by employing selected mono- and di-alkyl substituted monomers.