C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 279/02 (2006.01) C08F 291/02 (2006.01) C08L 25/06 (2006.01) C08L 9/00 (2006.01)
Patent
CA 2220353
A rubber-modified impact-resistant polystyrene resin composition is disclosed, which contains dispersed particles comprising a rubber-like polymer in amount of from 1 to 25% by weight, the rubber-like polymer being a high-cis high- vinyl polybutadiene which comprises from 65 to 95% cis-1,4- structures and from 30 to 4% 1,2-structures, and in which when the relationship between the 1,4-structures and 1,2- structures of the rubber-like polymer is represented by the expression .beta.=P1,2-1,4/(2×P1,2×P1,4) (wherein P1,2 represents the content of 1,2-structures, P1,4 represents the content of 1,4- structures, and P1,2-1,4 represents the content of 1,2-struc- ture/1,4-structure diads in all diads), then 1.0<.beta.<=1.43. The relationship between the viscosity of a 5% styrene solution of the rubber-like polymer as measurement at 25°C (5% SV) and the Mooney viscosity (ML1+4) of the polymer preferably satisfies the expression 2.0<=(5% SV)/ML1+4<=7Ø Another rubber-modified impact-resistant polystyrene resin composition is disclosed, which contains dispersed particles comprising a rubber-like polymer in an amount of from 3 to 15% by weight, the rubber-like polymer being a high-cis high-vinyl polybutadiene which comprises from 65 to 95% cis-1,4-structures and from 30 to 4% 1,2-structures, and in which when the relationship between the tensile elongation (E) of the rubber-modified impact-resistant polystyrene resin composition and the dispersed-particle diameter (X1) and amount (X2) of the rubber-like polymer is represented by the expression E=-17.8X1+5.6X2+38.5, then 20%<E<90%. The compositions have a well balanced combination of improved properties such as reactivity with styrene monomer, impact resistance, low-temperature properties, gloss, tensile strength, and tensile elongation.
Akahori Keiichi
Asakura Yoshio
Suzuki Michinori
Tsujimoto Nobuhiro
Wada Takashi
Riches Mckenzie & Herbert Llp
Ube Industries Ltd.
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