The Dow Chemical Company

Ludo M Aerts

Martin J Guest

Antonios Gkogkidis

P F V/d Berghen

Abraham F De Bert

Claude T Van Nuffel

Narasaiah Alle

The present invention pertains to thermoplastic polymer blends which comprise a monovinylidene aromatic copolymer, an acetal polymer and a thermoplastic polycarbonate resin or a polyester resin derived from the reaction of a dicarboxylic acid and a glycol, and which may also optionally contain an elastomeric material such as a thermoplastic polyurethane or an elastomeric copolyester. The resulting polymer blends have good processability and a beneficial combination of physical and chemical properties including thermal/dimensional stability, impact resistance, chemical resistance and environmental stress crack resistance. Said polymer blends are suitable for use in the preparation of a variety of molded utilitarian articles having good appearance and paintability.

Polymer blend compositions containing a styrenic copolymer, an acetal

Thermoplastic polymer blends comprising a monovinylidene aromatic copolymer, an acetal polymer and an elastomeric material such as a thermoplastic polyurethane or an elastomeric copolyester have good processability and a beneficial combination of physical and chemical properties including thermal/dimensional stability, impact resistance, chemical resistance and creep resistance. Said polymer blends are suitable for use in the preparation of a variety of molded utilitarian articles having good appearance and paintability.

Styrenic copolymer/polyacetal/thermoplastic polyurethane or elastomeric

Disclosed is a process for the production of a rubber-reinforced polymer composition having a bimodal particle size distribution using parallel, substantially plug flow reactors to separately polymerize the same or different solutions of a rubber in a monovinylidene aromatic monomer and optionally at least one other monomer. After separate partial polymerizations, first and second prepolymer compositions are produced containing rubber particles having average particle sizes of from 0.05 to 1.5 micrometer and from 0.7 to 10 micrometer, respectively, with the average rubber particle size of the second prepolymer composition being at least 1.3 times the average rubber particle size of the first prepolymer composition.

Process for the preparation of rubber-reinforced monovinylidene aromatic

Thermoplastic polymer blends comprising a major proportion by weight of certain monovinylidene aromatic copolymers and a minor proportion by weight of an acetal polymer have good processability and a beneficial combination of physical and chemical properties including thermal/dimensional stability, chemical resistance and creep resistance. Said polymer blends are suitable for use in the preparation of a variety of molded utilitarian articles having good appearance and paintability.

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Lokeren, Belgium

Ludo M Aerts