Bayer Corporation

Moh Ching Chang

Richard M Auclair

A thermoplastic molding composition which features improved impact and flow properties as well as reduced opacity is disclosed. The composition contains

Weatherable resinous composition

A thermoplastic composition comprising (a) a polyalkyl acrylate rubber characterized that it contains no grafted phase, and (b) a poly (vinyl aromatic-co-nitrile)-grafted polyalkyl acrylate rubber, and (c) ungrafted poly (vinyl aromatic-co-nitrile) having a number average molecular weight of about 20,000 to 100,000 g/mole is disclosed. The composition which contains about 15 to 35% by weight of polyalkyl acrylate rubber having a weight average particle size of about 0.02 to 1 microns and wherein weight ratio between (a) to the total (a)+(b) is 0.1 to 0.5, is characterized in having improved physical and mechanical properties.

Weatherable ASA composition

A thermoplastic molding composition which features improved impact and reduced opacity is disclosed. The composition which contains (A) 2 to 59 percent of a first grafted rubber having a weight average particle size of 0.05 to 0.30 microns, and (B) 6 to 56 percent of a second grafted rubber having a weight average particle size of 0.31 to 1.00 microns, and (C) 35 to 75 percent of a copolymeric matrix. The total rubber content of the composition is 10 to 40 percent relative to the total weight of (A), (B) and (C). The grafted rubber, both occurrences, contains a grafted phase and a core-shell phase. The grafted phase contains a styrenic copolymer and the core-shell phase, both occurrences, contains a core containing at least one crosslinked vinylaromatic polymer, and an elastomeric shell. The copolymeric matrix (C) contains a styrenic copolymer.

Weatherable resinous composition having improved opacity and impact

A thermoplastic molding composition which contains (i) a grafted copolymer rubber having a grafted phase of styrene-acrylonitrile phase and a crosslinked (meth)acrylate-acrylonitrile substrate, and (ii) an ungrafted, uncrosslinked SAN having a number average molecular weight of about 20,000 to 100,000 is disclosed. The composition which is further characterized in that it contains no additional grafted copolymer rubber based on crosslinked (meth)acrylate-acrylonitrile substrate and in that the grafted copolymer rubber is present in particulate form where the particles have a monomodal size distribution and a weight average particle size of 0.05 to 0.5 microns exhibits improved mechanical properties.

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Leverkusen, Germany

Moh Ching Chang