Thermoplastic resin composition having high impact and weather resistance

Claim 2

A THERMOPLASTIC RESIN COMPOSITION HAVING EXCELLENT RESISTANCE TO WEATHER AND IMPACT, WHICH COMPRISES A BINARY OR TERNARY GRAFT-COPOLYMER OF 5 TO 20 PERCENT BY WEIGHT OF A RUBBER COMPONENT CONSISTING ESSENTIALLY OF AN ETHYLENE-PROPYLENE RUBBER AND 95 TO 80 PERCENT BY WEIGHT OF AN AROMATIC VINYL COMPOUND OR AN AROMATIC VINYL COMPOUND AND A VINYL CYANIDE COMPOUND, THE RATIO OF THE AROMATIC VINYL COMPOUND TO THE VINYL CYANIDE COMPOUND BEING 4:3 TO 5:1, 0.5 TO 10 PERCENT BY WEIGHT OF LIQUID PARAFFIN HAVING A SPECIFIC GRAVITY OF 0.860 TO 0.905, 0.005 TO 3 PERCENT BY WEIGHT OF ANTIOXIDANT, AN ULTRAVIOLET ABSORBER OR BOTH THEREOF, BASED ON THE WEIGHT OF THE RESIN COMPOSITION, SAID ETHYLENE-PROPYLENE RUBBER COMPRISING ETHYLENE AND PROPYLENE IN A MOLAR RATIO OF 5:1 TO 1:3 AND SELECTED FROM THE GROUP CNSISTING OF ETHYLENE-PROPYLENE COPOLYMER AND ETHYLENE-PROPYLENE TERPOLYMER CONTAINING AS A THIRD COMPONENT DICYCLOPENTADIENE, ETHYLIDENENORBORNENE, 1,4-HEXADIENE, 1,5-HEXADIENE, 2-METHYL-1,5HEXADIENE, 1,4-CYCLOHEPTADIENE, 1,5-CYCLOOCTADIENE OR MIXTURES OF THESE COMPOUNDS AND HAVING AN IODINE NUMBER OF 4 TO 50.

Claim 3

A thermoplastic resin composition according to claim 1, wherein the amount of the liquid paraffin is 1 to 5 percent by weight.

Claim 4

A thermoplastic resin composition according to claim 1, wherein the aromatic vinyl compound is selected from the group consisting of styrene, Alpha -methylstyrene, Alpha -chlorostyrene, and dimethylstyrene.

Claim 5

A thermoplastic resin composition according to claim 1, wherein the vinyl cyanide compound is selecteD from the group consisting of acrylonitrile and methacrylonitrile.

Claim 6

A thermoplastic resin composition according to claim 1, wherein the ternary graft-copolymer consists of the ethylene-propylene rubber, styrene and acrylonitrile, the weight ratio of the styrene to the acrylonitrile being 65 : 35 to 80 : 20.

Claim 7

A thermoplastic resin composition according to claim 1, wherein the antioxidant is selected from the group consisting of phenolic type, thioether type, amine type, phosphite type and dithio acid salt type.

Claim 8

A thermoplastic resin composition according to claim 1, wherein the ultraviolet absorber is selected from the group consisting of salicylic acid type, benzophenone type and benzotriazole type.

Claim 9

A thermoplastic resin composition according to claim 1, wherein the rubber component consists of an ethylene-propylene-ethylidenenorbornene terpolymer, the aromatic vinyl compound is styrene and the vinyl cyanide compound is acrylonitrile.

Claim 10

A thermoplastic resin composition having excellent resistance to weather and impact, which comprises a binary or ternary graft-polymer of 5 to 20% by weight of a rubber component consisting of a major amount of ethylene-propylene rubber and a minor amount of at least one member selected from the group consisting of polybutadiene, polyisoprene and styrene-butadiene rubber and 95 to 80% by weight of an aromatic vinyl compound or an aromatic vinyl compound and a vinyl cyanide compound, the ratio of the aromatic vinyl compound to the vinyl cyanide compound being 4:3 to 5:1; 0.5 to 10 percent by weight of liquid paraffin having a specific gravity of 0.860 to 0.905; 0.05 to 3 percent by weight of an antioxidant, an ultraviolet absorber or both thereof, based on the weight of the resin composition, said ethylene-propylene rubber comprising ethylene and propylene in a molar ratio of 5:1 to 1:3 and selected from the group consisting of ethylene-propylene copolymer and ethylene-propylene terpolymer containing as a third component dicyclopentadiene, ethylidenenorbornene, 1,4-hexadiene, 1,5-hexadiene, 2-methyl-1,5-hexadiene, 1,4-cycloheptadiene, 1,5-cyclooctudiene or mixtures of these compounds and having an iodine number of 4 to 50.

Claim 11

A thermoplastic resin composition having excellent resistance to weather and impact, which comprises a binary or ternary graft-polymer of 5 to 20% by weight of a rubber component consisting of a major amount of ethylene-propylene rubber and a minor amount of at least one member selected from the group consisting of polybutadiene, polyisoprene and styrene-butadiene rubber and 95 to 80% by weight of an aromatic vinyl compound or an aromatic vinyl compound and a vinyl cyanide compound, the ratio of the aromatic vinyl compound to the vinyl cyanide compound being 4:3 to 5:1; 0.5 to 10 percent by weight of liquid paraffin having a specific gravity of 0.860 to 0.905; 0.05 to 3 percent by weight of an antioxidant, an ultraviolet absorber or both thereof, based on the weight of the resin composition, said ethylene-propylene rubber comprising ethylene and propylene in a molar ratio of 5:1 to 1:3 and selected from the group consisting of ethylene-propylene copolymer and ethylene-propylene terpolymer containing as a third component dicyclopentadiene, ethylidenenorbornene, 1,4-hexadiene, 1,5-hexadiene, 2-methyl-1,5-hexadiene, 1,4-cycloheptadiene, 1,5-cyclooctudiene or mixtures of these compounds and having an iodine number of 4 to 50.