Union Carbide Corporation

Amoco Corporation

Union Carbide Industrial Gases Technology Corporation

James H Kawakami

Louis M Maresca

Lloyd Mahlon Robeson

James E Harris

George L Brode

Robert J Cotter

Robert J Ward

Neil J McCarthy

George T Kwiatkowski

Benito See

Natarajan Muruganandam

Thomas R Jones

Benjamin Bikson

Eddie Hedaya

Ulrich A Steiner

Lee P McMaster

Yurdagul F Ozcayir

Gertrud Gotz

Wong F Ark

Bernard Cooker

Described herein are novel polyarylates derived from mixtures of terephthalic and isophthalic acids, hydroquinone and 4,4'-dihydroxydiphenyl sulfone. The instant polyarylates exhibit excellent stress-crack resistance in a wide variety of solvents. Moreover, the materials display very good mechanical and thermal properties.

Copoly arylate from hydroquinone and dihydroxy diphenyl sulfone

Permeable membranes comprised predominantly of specifically defined tetrabromobisphenols and aromatic dicarboxylic acids. The invention also pertains to the novel permeation processes for recovery of an oxygen/nitrogen or carbon dioxide/methane component form a mixture of said component with other components.

Semipermeable membranes based on specified tetrabromobisphenol type

Injection-moldable copolyesters of terephthalate units, ethylene units and a high proportion (e.g. 82-87) mole %) of oxybenzoate units, and cookware made of such copolyesters. Process for making such copolyesters by reacting polyethylene terephthalate with p-acetoxybenzoic acid in a solvent, first at a temperature below 240.degree. C. to product a fragmented polyester, raising the temperature to split off acetic acid, then adding more acetoxybenzoic acid to raise the oxybenzoate content to more than 80 mole %.

Copolyesters

This invention relates to moldable polyarylates and in particular to moldable polyarylate compositions which have repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl) sulfone (TMBS), optionally a dihydric phenol such as 2,2-bis-(4-hydroxyphenyl)-propane (Bisphenol A) and a mixture of isophthalic acid and terephthalic acid or derivatives thereof. Such polyarylates exhibit improved hydrolytic stability.

Polyarylates having improved hydrolytic stability

Permeable membranes comprised predominantly of specifically defined polyester of 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol] and aromatic dicarboxylic acids. The invention also pertains to the novel permeation processes for recovery of an oxygen/nitrogen or carbon dioxide/methane or helium/methane component from a mixture of said component with other components in the mixture.

Semipermeable membranes based on specific

Sulfonated hexafluoro bis-A-polysulfone membranes of polymers and copolymers having the repeat unit of the structure; ##STR1## in the polymer molecule that exhibit improved permeation and separation characteristics and processes for the use thereof for separation of a component from a fluid mixture of said component in admixture with other components.

Sulfonated hexafluoro bis-a polysulfone membranes and process for fluid

Described is a process for improving the color of thermoplastic polymers by contacting the polymer with a peracid, hydrogen peroxide or other peroxygen compound.

Process for treating thermoplastic polymers

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 polycarbonate exhibit improved hydrolytic stability and also excellent processability in molding applications.

Ordered, alternating sulfone polycarbonate composition

A molding composition containing a compatible blend of (i) a polycarbonate having repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl)sulfone (TMBS), optionally a dihydric phenol such as 2,2-bis(4-hydroxyphenyl)propane (Bisphenol A) and a carbonate precursor, and (ii) a vinyl chloride derived polymer.

Miscible blends of polycarbonate with vinyl chloride derived polymers

A moldable and compatible blend of 5 to 95 weight percent polycarbonate comprising from about 20 weight percent to 100 weight percent of repeating units (I) having the formula ##STR1## and from 0 weight percent to about 80 weight percent of repeating units (II) having the formula ##STR2## in which the repeating units (I) and the repeating units (II) are connected by interbonding units (III) having the formula ##STR3## 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, and R.sub.1 is a divalent saturated or unsaturated aliphatic 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 repeating unit (II) is not the same as repeating unit (I), and 95 to 5 weight percent of a styrenic polymer.

Polycarbonate blends

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.

Polycarbonates having improved hydrolytic stability

Described is a process for improving the color of thermoplastic polymers by contacting the monomer(s) before or during polymerization with an alkali or alkaline earth metal formate.

Polymerization process using metal formate to reduce the color of

Color improved polyarylates having a reduced viscosity of from about 0.1 to greater than 1.0 dl/gm produced by a process comprising the following steps:

Color improved polyarylate

An improved process for preparing a polyarylate having a reduced viscosity of from about 0.1 to greater than 1.0 dl/gm comprising the following steps:

Process for preparing polyarylates

Oligomers of hydroxy terminated polysulfones are extended to high molecular weight polysulfones by carbonate, ester, ether or silyl ether linkages.

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Piscataway, NJ, United States of America

James H Kawakami