Rubber modified styrenic resin composition having high gloss and impact strength

A rubber modified styrenic resin composition obtained by dispersing rubbery polymer particles in a homopolymer or a copolymer of a styrenic monomer wherein said rubber modified styrenic resin composition has:

• (a) a volume-average particle size of the rubbery polymer particles in the range of from 0.2 to 0.8 .mu.m,
• (b) a particle size distribution curve on the basis of the volume of the rubbery polymer particles having one peak,
• (c) a ratio of a 5% value to a 95% value of the cumulative distribution of the particle size on the basis of the volume of the rubbery polymer particles in the range of from 3 to 45,
• said rubbery polymer particles comprising particles having a cell or coil particle morphology and particles having a capsule particle morphology wherein a volume-average particle size of the particles having the cell or coil particle morphology is from 0.3 to 2.0 .mu.m, a volume-average particle size of the particles having the capsule particle morphology is from 0.1 to 1.0 .mu.m, a ratio of the number of the particles having the capsule particle morphology to the number of the total particles is from 30 to 99%, and a ratio of the number of the particles having the cell or coil particle morphology to the number of the total particles is from 70 to 1%, and wherein the rubbery polymer of the rubbery polymer particles comprises:
• (i) a styrene-butadiene block copolymer (I) having a 5% by weight styrene solution viscosity of 20-50 centipoise and a styrene content of 25-50% by weight, and
• (ii)
• (1) a styrene-butadiene block copolymer (II) having a 5% by weight styrene solution viscosity of 20-50 centipoise and a styrene content of 5-20% by weight wherein the weight ratio of the styrene-butadiene block copolymer (I) to the styrene-butadiene block copolymer (II) is from 95/5 to 40/60, or
• (2) a polybutadiene (III) having a 5% by weight styrene solution viscosity of 20-100 centipoise wherein the weight ratio of the styrene-butadiene block copolymer (I) to the polybutadiene (III) is from 95/5 to 40/60, or
• (3) a styrene-butadiene block copolymer (IV) having a 5% by weight styrene solution viscosity of 20-50 centipoise and a styrene content of 5-20% by weight, and a polybutadiene (V) having a 5% by weight styrene solution viscosity of 30-90 centipoise wherein the weight ratio (I)/(IV) of (I) to (IV) is 95/5 to 40/60, and the weight ratio [(I)+(IV)]/(V) of the sum of (I) and (IV) to (V) is from 99/1 to 70/30.