| 摘要 |
PURPOSE:To produce the titled resin having excellent thermal aging resistance and weather resistance, by the radical polymerization of a styrene monomer and a polybutadiene rubber having specific molecular weight distribution, 1,2-bond fraction, Mooney viscosity, and styrene solution viscosity. CONSTITUTION:The objective resin is produced by the radical polymerization of (A) 98-80(wt%) styrene monomer or a mixture of styrene monomer and an unsaturated compound copolymerizable therewith (e.g. acrylonitrile) and (B) 2-20% impact modifier comprising a polybutadiene rubber having (i) a weight-average molecular weight (Mw) of 50,000-700,000 measured by gel-permeation chromatography, and molecular weight distribution of 1.5-5.0 defined by the ratio of Mw to Mn (number-average molecular weight) (Mw/Mn), (ii) 1,2-bond fraction of <=1.0 measured by <1>H-NMR, (iii) Mooney viscosity of 10-70 measured at 100 deg.C using the L-rotor, and (iv) 5% styrene solution viscosity of 15-400cps at 25 deg.C. |
