Organic materials having meta, para-isopropylidene diphenoxy units and method
AssigneeGeneral Electric Company
InventorDonald E. Keeley
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Abstract
Meta,para-isopropylidene bisphenol is homopolymerized and copolymerized to produce a variety of high performance thermoplastics having improved processing characteristics. In addition to polycarbonates, there are provided polyesters, polyestercarbonates, polyepoxides, polysulfones, polyetherimides, polyformals, epoxy resins and polycarbonate-polydiorganosiloxane block polymers.
Claims6
Thermoplastic polycarbonates having improved flow characteristics and chemically combined units of the formula, ##STR26##
A thermoplastic organic polycarbonate, consisting essentially of chemically combined meta,para-isopropylidene bisphenoxy units and para,para-isopropylidene bisphenoxy units.
An organic polycarbonate having at least 3 mole percent of chemically combined meta,para-isopropylidene bisphenoxy units.
A thermoplastic organic polycarbonate, having substantially equal molar amounts of meta,para-isopropylidene bisphenoxy units and para,para-isopropylidene bisphenoxy units.
In a method for making thermoplastic organic polycarbonates by phosgenating a p,p-bisphenol of the formula, ##STR27## resulting in the production of polycarbonates consisting essentially of chemically combined units of the formula, ##STR28## having molding temperatures exceeding 250.degree. C., the improvement which comprises phosgenating a mixture comprising p,p-bisphenol and from 3-100 mole percent of a m,p-bisphenol of the formula, ##STR29## whereby a polycarbonate is obtained having improved flow characteristics, where R is selected from the class consisting of C.sub.(1-8) alkyl radicals, C.sub.(1-6) alkoxy radicals, X is a halogen radical, a is a whole number equal to 0 to 4 inclusive, b is a whole number equal to 0 to 3 inclusive and the sum of a and b is equal to 0 to 4 inclusive.
Dependencies are inferred from the claim text.