Mobay Chemical Corporation

Bayer Corporation

Mobay Corporation

Ethyl Corporation

James Y Chung

Dieter Neuray

Mark W Witman

Jesse D Jones

Hsueh M Li

Nelson R Lazear

Peter H Markusch

James W Rosthauser

James P Mason

Gerard E Reinert

Russell P Carter, Jr

John J Charles

George R Kriek

A thermoplastic polycarbonate molding composition resistant to ionizing radiation is disclosed. Accordingly, a composition containing a polycarbonate resin and an effective amount of an ester based on an aromatic carboxylic acid and at least one member selected from the group consisting of secondary alcohol, benzyl alcohol and tertiary alcohol was found to be resistant to the yellowing which characterizes polycarbonate compositions exposed to ionizing radiation.

Polycarbonate compositions resistant to ionizing radiation

The invention is based on the surprising and unexpected finding that the impact performance of a thermoplastic composition containing aromatic polycarbonate resin and glass fibers is improved upon incorporation therewith of a particular silicone rubber powder. The silicone rubber powder, added at a level of about 0.5 to 4 percent, relative to the weight of the composition, is characterized in that it contains a mixture of (a) a polydiorganosiloxane and (b) silica, said glass fibers being of the type which do not, per se, adhere to the polycarbonate matrix in which they are incorporated.

Glass fiber-reinforced polycarbonate molding compositions having

The impact strength of a thermoplastic molding composition containing aromatic polycarbonate resin is improved upon the incorporation therewith of a particular silicone rubber powder. The silicone rubber powder, added at a level of greater than 1 and less than 5 percent, contains a mixture of (a) a polydiorganosiloxane and (b) finely divided silica filler.

Toughened thermoplastic molding composition

It was surprisingly found that a thermoplastic molding composition which contains polycarbonate and polyalkylene terephthalate resins at a particular weight ratio therebetween is rendered improved impact strength and hydrolysis resistance upon the incorporation of an additive amount of high melt flow high density polyethylene therewith. The molding composition of the invention comprise about 20-90 percent of polycarbonate resin, 80-10 percent of polyalkylene terephthalate (preferably PET) and about 3 to 5 percent of a high density polyethylene resin having a specific gravity of 0.94-0.97 and melt flow of 1 to 80 gm/10 min. as determined in accordance with ASTM D 1238.

Toughened, hydrolysis resistant polycarbonate/polyester blends

A thermoplastic molding composition comprising a blend of a thermoplastic polyester, a rubber-elastic impact modifying compound and a certain blocked (capped) polyisocyanate prepolymer is disclosed characterized in that it has an improved level of impact strength.

Thermoplastic polyester molding composition having an improved impact

Thermoplastic molding compositions comprising a polycarbonate resin, a thermoplastic polyester and an impact modifier were found to maintain their impact performance, especially at low temperatures, while exhibiting a reduced melt viscosity upon the blending therewith a relatively small amount of a certain ester plasticizer.

Thermoplastic compositions having improved mechanical properties

The present invention is directed to thermoplastic molding compositions comprising a blend of poly(alkylene terephthalate) and polycarbonate resins characterized in that the weight ratio between said resins is about 1:1 to 4:1 and in that a graft modified polybutadiene rubber is added thereto, said compositions exhibiting an improved level of impact strength.

Thermoplastic molding compositions

A thermoplastic blend comprising a C.sub.1 -C.sub.4 (alkylene terephthalate), a polycarbonate resin and a butadiene or an acrylate based graft copolymer was found to be amenable without pre-extrusion drying, to thermoplastic processing upon the admixing therewith an additive amount of a polymeric modifier.

Thermoplastic resinous blend and a method for its preparation

The invention relates to a thermoplastic molding composition comprising a blend of a thermoplastic polyester and a reinforcing amount of a reinforcing agent. An improvement in the impact performance of the composition is disclosed to result upon the incorporation therewith of a blocked (end-capped) polyisocyanate prepolymer.

Improved injection moldability of polyethylene terephthalates is achieved by the addition of an epoxidized plasticizer and a nucleating agent cooperative with the epoxidized plasticizer to achieve the improved moldability even when the composition is injection molded using mold temperatures of at least as low as 93.degree. C.

Injection-moldable thermoplastic polyester composition

The present invention is directed to thermoplastic molding compositions which comprise a blend containing a thermoplastic polyester, a polycarbonate resin and an impact modifier and an amount of a blocked polyisocyanate prepolymer sufficient to improve the impact resistance and gasoline resistance of said blend.

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Wexford, PA, United States of America

James Y Chung