Abstract The invention relates to a thermoplastic molding material of an elastomeric polymer A, a shell B grafted to the polymer A, and a copolymer C as rigid matrix. The amount of polymer A is 1 to 25 percent by weight based on the weight of A+B+C. It has a glass transition temperature, Tg, of less than 0° C. and an average particle size of 200 to 750 nanometers (d 50 value of the integral mass distribution) and is composed of: 50 to 99.9 percent by weight of at least one alkylacrylate with 1 to 8 carbon atoms in the alkyl radical and 0.1 to 5 percent by weight of a polyfunctional monomer which has a crosslinking action. Grafting shell B represents 5 to 40 percent by weight based on A+B+C and is composed of at least one of the monomers of the group of (b 1 ) vinylaromatic monomers, and (b 2 ) the ethylenically unsaturated monomers. Grafting shell B is prepared in two stages with 30 to 70 percent by weight of the monomers b 1 being used in the first stage, and 30 to 70 percent by weight of a mixture of monomers b 1 and b 2 in a weight ratio of 90:10 to 60:40 being used in the second stage. Copolymer C is added in an amount of 35 to 94 percent by weight based on A+B+C and consists of a vinylaromatic monomer and an ethylenically unsaturated monomer. The molding material may contain commonly used additives in effective amounts and is used for the preparation of molded parts.
A thermoplastic molding material consisting of (A) 1 to 25 percent by weight based on the weight of A+B+C of at least one elastomeric polymer which has a glass temperature, Tg, of less than 0° C. and consists of: (1) 50 to 99.9 percent by weight of at least one alkyl acrylate having 1 to 8 carbon atoms in the alkyl radical (2) 0.1 to 5 percent by weight of a polyfunctional monomer having a cross-linking effect and (B) 5 to 40 percent by weight based on the weight of A+B+C of a shell grafted to the elastomeric polymer A the graft polymer having an average particle size of 200 to 750 nm (d 50 - value of the integral mass distribution) wherein the polymerization of the grafted shell consisting of (B) takes place in two stages with 30 to 70 percent by weight of a monomer (B1) selected from the group consisting of styrene, α-methylstyrene and para-methylstyrene in the first stage and 30 to 70 percent by weight of a mixture of the monomer (B1) and a monomer (B2) of acrylonitrile in a weight ratio of 90:10 to 60:40 in the second stage and (C) 35 to 94 percent by weight based on the weight of A+B+C of a copolymer consisting of a styrene/acrylonitrile copolymer.
Claim 2
Dependent Claim
216 words
A thermoplastic molding material consisting of (A) 1 to 25 percent by weight based on the weight of A+B+C of at least one elastomeric polymer which has a glass temperature, Tg, of less than 0° C. and consists of: (1) 50 to 99.9 percent by weight of at least one alkyl acrylate having 1 to 8 carbon atoms in the alkyl radical (2) 0.1 to 5 percent by weight of a polyfunctional monomer having a cross-linking effect and (B) 5 to 40 percent by weight based on the weight of A+B+C of a shell grafted to the elastomeric polymer A the graft polymer having an average particle size of 200 to 750 nm (d 50 - value of the integral mass distribution) wherein the polymerization of the grafted shell consisting of (B) takes place in two stages with 30 to 70 percent by weight of a monomer (B1) selected from the group consisting of styrene, α-methylstyrene and para-methylstyrene in the first stage and 30 to 70 percent by weight of a mixture of the monomer (B1) and a monomer (B2) of acrylonitrile in a weight ratio of 90:10 to 60:40 in the second stage and (C) 35 to 94 percent by weight based on the weight of A+B+C of a copolymer consisting of a styrene/acrylonitrile copolymer.
Claim 3
Dependent Claim
28 words
The thermoplastic molding material of claim 1 wherein (A)(1) is selected from the group consisting of the n-butylester of acrylic acid and the ethylhexyl ester of acrylic acid.
Claim 4
Dependent Claim
26 words
The thermoplastic molding material of claim 1 wherein (A)(2) is selected from the group consisting of divinylbenzene, diallylmaleate, diallylfumarate, diallylphthalate and the acrylate ester of tricyclodecenylalcohol.