Mobay Chemical Corporation

Mobay Corporation

Parameswar Sivaramakrishnan

Arthur L Baron

The present invention relates to the novel monomers generically identified as bis(4-hydroxyphenyl thio)benzenes, to a process for their production and to their use in the preparation of polycarbonates, polyurethanes, polyesters, polysulfones and polyethers.

Preparation of bis(4-hydroxyphenyl thio)benzenes

Polycarbonates are provided having improved critical thickness values based on an aromatic diphenol preferably bisphenol A and an aromatic diphenol thioether. By incorporating 2 up to 20 mole percent of the aromatic diphenol thioether based on the total diphenol content into the polymer, the critical thickness of the article molded from the polycarbonate is substantially improved.

Polycarbonate having improved critical thickness

Polycarbonates are provided with hydrolytic stability by combining the polycarbonate polymer with a carboxylic acid salt of cadmium. The cadmium salt provides improved hydrolytic stability to both polycarbonates based on diphenols and halogenated diphenols over conventional stabilizers, and does not detrimentally affect other properties such as color stability, haze, initial tensile strength and elongation.

Polycarbonate having improved hydrolytic stability

The present invention relates to the novel monomers generically identified as bis(4-hydroxyphenyl sulfonylphenyl) biphenyl disulfones, to a process for their production and to their use in the preparation of polycarbonates, polyurethanes, polyesters, polysulfones and polyethers.

Bis(4-hydroxyphenyl sulfonylphenyl) bisphenyl disulfones and useful

The present invention pertains to a halogen-containing, copolycarbonate blend having improved critical thickness and flammability properties comprising an aromatic copolycarbonate comprising the reaction product of an aromatic diphenol, an aromatic thiodiphenol and a carbonic acid derivative, such as phosgene or carbonyl bromide, blended with an effective amount of a halogen-containing compound. In a preferred embodiment, the copolycarbonate blend also contains small amounts of a perfluoro sulfonic or carboxylic acid salt.

Flame retardant polycarbonate polyblends

Polycarbonates suitable for forming molded articles are comprised of a polycarbonate resin and 0.25 to 0.75 parts by weight per 100 parts of polycarbonate of an ethylene-vinylacetate copolymer. The articles molded from the polycarbonate resin with the ethylene-vinylacetate copolymer therein exhibit improved stress crack resistance.

Stress crack resistant polycarbonates

Aromatic polycarbonate resin mixtures consisting essentially of an aromatic carbonate having the repetitive carbonate group ##STR1## and in addition always the ##STR2## RADICAL ATTACHED TO A CARBONATE GROUP AND A MODIFYING MINOR AMOUNT OF A POLYCAPROLACTONE POLYMER HAVING THE FORMULA ##STR3## WHERE N IS GREATER THAN 100 AND LESS THAN 3000, EXHIBIT, AS COMPARED TO THOSE OF AROMATIC POLYCARBONATES ALONE, E.G. IMPROVED MELT STABILITY. The modified polycarbonates are produced by intimately premixing the polycarbonate with minor selected amounts of polycaprolactone.

Modified aromatic polycarbonates

Polycarbonates are provided having improved critical thickness values based on an aromatic diphenol, a halogenated dihydric phenol and an aromatic diphenol thioether. By incorporating an effective amount of the aromatic thiodiphenol based on the total diphenol content into the polymer the critical thickness and flame retardant characteristics of the polycarbonate is substantially improved.

Flame retardant polycarbonate having improved critical thickness

Polycarbonate articles are provided with enhanced flame retardant characteristics by the addition of ferrocene and derivatives thereof to polycarbonate resins.

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New Martinsville, WV, United States of America

Parameswar Sivaramakrishnan