| 摘要 |
PURPOSE:The titled composition excellent in impact resistance and excellent also in gloss and appearance, prepared by dissolving a specified rubber in a monovinyl aromatic monomer and polymerizing the mixture so as to form flexible component particles having a surface mean diameter, a degree of grafting and a degree of crosslinking each in a specified range. CONSTITUTION:High-cis-polybutadiene rubber (e.g., one having a 1,4-cis bond content >=78mol%, a 1,2-vinyl bond content <=20mol%, and a solution viscosity, as measured in a 5% styrene solution at 25 deg.C, of 20-200cSt) is dissolved in 88-98wt% monovinyl aromatic monomer (e.g., styrene), and the mixture is polymerized to form a resin composition in which flexible component particles are dispersed. The polymerization is conducted so that the flexible component particles may have a surface mean diameter of 0.5-1.5mum, a degree of grafting of 24-35%, and a degree of crosslinking of 40-55%. It is possible to obtain the titled composition excellent in impact resistance, gloss and appearance, and free of an iridescent appearance. |
