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IMPROVED MASS POLYMERIZED RUBBER-MODIFIED MONOVINYLIDENE AROMATIC COPOLYMER COMPOSITIONS

IP.com Disclosure Number: IPCOM000010713D
Publication Date: 2003-Jan-13
Document File: 2 page(s) / 29K

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The IP.com Prior Art Database

Related People

G. Bouquet: AUTHOR [+3]

Abstract

A high heat, high impact rubber modified polymer has been developed having a continuous matrix phase comprising a monovinylidene aromatic monomer, an ethylenically unsaturated nitrile monomer and a N-substituted maleimide monomer; with a rubber formed as discrete rubber particles as described in U.S. 6,380,304. The mass polymerized polymer compositions are an improvement over the high heat resins described in U.S. 5,412,036 and are especially useful in the preparation of molded objects where a balance of high surface gloss, high heat and good impact resistance is desired.

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IMPROVED MASS POLYMERIZED RUBBER-MODIFIED MONOVINYLIDENE AROMATIC COPOLYMER COMPOSITIONS

Authors : G.Bouquet, R.Vanspeybroeck

A high heat, high impact rubber modified polymer has been developed having a continuous matrix phase comprising a monovinylidene aromatic monomer, an ethylenically unsaturated nitrile monomer and a N-substituted maleimide monomer; with a rubber formed as discrete rubber particles as described in U.S. 6,380,304. The mass polymerized polymer compositions are an improvement over the high heat resins described in U.S. 5,412,036 and are especially useful in the preparation of molded objects where a balance of high surface gloss, high heat and good impact resistance is desired.�

The matrix comprises the polymerization product of a monovinylidene aromatic monomer, an ethylenically unsaturated nitrile monomer and an N-substituted maleimide monomer.� Monovinylidene aromatic monomers include but are not limited to those described in U.S. 4,666,987; 4,572,819 and 4,585,825,� with the preferred being styrene, typically constituting from an amount equal to or greater than about 50 weight percent, based on the total weight of the matrix polymer.� Unsaturated nitriles include, but are not limited to, acrylonitrile, methacrylonitrile, ethacrylonitrile, fumaronitrile and mixtures thereof, and is optionally employed in the matrix polymer in an amount equal to or greater than about 5 weight percent based on the total weight of the matrix polymer. N-substituted maleimide monomers include N-alkyl maleimides, N-cycloalkyl-maleimides and N-aryl-maleimides such as N-phenylmaleimide (N-PMI), and the like.� Typically, the maleimide will constitute form about 1 to about 35 weight percent of the matrix polymer and grafted/occluded polymer constituents.� The maleimide can be added at the beginning of the polymerization process, or can be added in portions throughout the polymerization.

The matrix polymer is present in an amount equal to or greater than about 40 weight percent, based on the weight of the rubber-modified monovinylidene aromatic polymer. � Various techniques suitable for producing rubber-modified monovinylidene aromatic copolymer are well known in the art and exemplified in USP 3,660,535; 3,243,481 and 4,239,863.

        � � � � � � � � � � � The rubber is a blend of a linear block copolymer rubber and a conjugated diene rubber (linear or branched).

Linear block copolymers can be represented by one of the following general formulas: S-B; S1-B-S2; B1-S1-B2-S2; in which S, S1, and S2 are polymer blocks of a monovinylidene aromatic monomer, with equal or di...