Mitsubishi Rayon Company, Limited

Masamitsu Tateyama

Yoshio Nakai

Kazumasa Kamata

Fumio Sato

Masaaki Kishimura

Katsusuke Yamauchi

Disclosed is an impact-resistant thermoplastic resin composition which comprises a graft copolymer [II]. The graft copolymer [II] is prepared by enlarging the particles in a latex of a rubbery copolymer [I] formed by emulsion polymerization of a monomer mixture of 51-91 wt. % of an alkyl acrylate and 49-1 wt. % of 1,3-butadiene to adjust the particle size to 0.12-0.4 .mu.m by addition of (A) an acid group-containing copolymer obtained by performing emulsion polymerization of a mixture of 3-40 wt. % of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, cinnamic acid, sorbic acid and/or p-styrene-sulfonic acid, and 97-35 wt. % of an alkyl acrylate, and (B) a salt of an oxyacid having a central element of Groups III to VI of the periodic table, the element belonging to the second or third period, with an alkali or alkaline earth metal or Zn, Ni or Al; and then, polymerizing in the presence of the enlarged rubber copolymer a monomer or monomer mixture comprising 50-100 wt. % of methyl methacrylate and/or styrene. A polymer or copolymer of methyl methacrylate and/or styrene may be incorporated in the thermoplastic resin composition.

Impact resistant thermoplastic resin composition

An impact resistant methacrylic resin composition having improved transparency, weatherability and impact resistance comprising a multi-layer graft copolymer and a methacrylic resin is disclosed. The multi-layer graft copolymer is prepared through 3 step polymerizations as follows: in the first step, a semi-soft copolymer is prepared by polymerizing specific amounts of an alkyl methacrylate having an alkyl group with 1 to 4 carbon atoms, styrene and/or its derivative, alkyl acrylate having an alkyl group with 1 to 8 carbon atoms and a specific polyfunctional monomer; in the second step, a soft copolymer containing alkyl acrylates having an alkyl group with 1 to 8 carbon atoms as the main unit is prepared so that the semi-soft copolymer is included in the inner layer of the soft copolymer; and in the third step, a methacrylic polymer or copolymer is prepared by polymerizing monomers main component of which is alkyl methacrylates having an alkyl group with 1 to 4 carbon atoms or a mixture thereof to form an outermost layer. The third step may be divided into two or more steps. The multi-layer methacrylic copolymer thus obtained is compounded with and dispersed in a methacrylic resin the unit of which is methyl methacrylate.

Impact resistant methacrylic resin composition

A methacrylic resin composition having excellent impact resistance and antistatic property is described. This composition comprises (I) 50-99.8 wt. % of a methacrylic resin comprised of 80-100 wt. % of methyl methacrylate units and 0-20 wt. % of other copolymerizable monomer units, (II) 0.1-40 wt. % of a rubbery component which is a polymer containing an elastomeric portion comprising at least 50 wt. % of 1,3-butadiene and/or acrylic acid ester units, and (III) 0.1-10 wt. % of a specified compound.

Methacrylic resin composition

Disclosed is an impact-resistant methacrylic resin composition which comprises a graft copolymer [II] obtained by polymerizing 10 to 900 wt. parts of a monomer or monomeric mixture (B) comprising 80 to 100 wt. % methyl methacrylate and 20 to 0 wt. % of at least one vinyl or vinylidene monomer copolymerizable therewith in the presence of 100 wt. parts of an acrylic elastomer [I] obtained by polymerizing monomeric mixture (A) comprising 9.9 to 29.9 wt. % of styrene and/or its derivative, 70 to 90 wt. % of at least one alkyl (C2-8) acrylate, 0.1 to 5 wt. % of at least one monomer represented by the formula: ##STR1## and 0 to 5 wt. % of a crosslinkable copolymerizable monomer having at least 2 carbon-to-carbon double bonds. This graft copolymer [II] may be used in combination with a methacrylic resin [III] obtained by polymerizing a monomer or monomeric mixture (C) comprising 80 to 100 wt. % methyl methacrylate and 20 to 0 wt. % of at least one copolymerizable vinyl or vinylidene monomer. The impact-resistant resin composition has excellent transparency and weatherability and a good surface gloss.

Impact-resistant methacrylic resin composition

An impact-resistant methacrylic resin composition comprising a multilayer structure methacrylic resin [II] is provided. The resin [II] is obtained by the following sequential four polymerization stages (i) through (iv):

This invention relates to a process for emulsion polymerization of a vinyl monomer in an aqueous dispersion medium in which a salt of an N-acylsarcosine and an alkali metal salt and/or ammonium salt of an oxyacid are made to coexist with each other.

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Yamaguchi, Japan

Masamitsu Tateyama