C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 25/04 (2006.01) C08L 25/10 (2006.01) C08L 53/02 (2006.01)
Patent
CA 2092104
A rubber modified styrenic resin composition is here disclosed which can be obtained by dispersing rubber-like polymer particles in a homopolymer or a copolymer of a styrenic monomer, said rubber modified styrenic resin composition being characterized in that: (a) a volume-average particle size of the rubber-like polymer particles is in the range of from 0.2 to 0.8 (b) a particle size distribution curve on the basis of the volume of the rubber-like polymer particles has 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 rubber-like polymer particles is in the range of from 8 to 45, (d) the rubber-like polymer which is a formation material of the rubber-like 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 (a weight ratio of the styrene-butadiene block copolymer (I) to the styrene-butadiene block copolymer (II) is from 95/5 to 40/60), (2) a polybutadiene (III) having a 5% weight styrene solution viscosity of 20-100 centipoise (a 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 50 weight styrene solution viscosity of 30-90 centipoise (a weight ratio (I)/(IV) of (I) to (IV) is 95/5 to 40/60, and a weight ratio [(I) + (IV)]/(V) of the sum of (I) and (IV) to (V) is from 99/1 to 70/30.
Ando Toshihiko
Ichikawa Kouzou
Iwamoto Mune
Kaneko Masahiro
Nakajima Akihiko
Mitsui Chemicals Incorporated
Sim & Mcburney
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