| 摘要 |
PURPOSE: To obtain a rubber-modified styrene resin composaition excellent in gloss, mechanical strengths and colorability. CONSTITUTION: This rubber-modified styrene resin composition is prepared by dissolving a rubbery polymer in a styrene monomer and subjecting the solution to a graft polymerization reaction, wherein (1) the rubbery polymer is dispersed in the styrene polymer matrix in the form of particles of a mean particle diameter of 0.5-1.6μm, (2) the dispersed rubbery polymer particles have a salami structure in which part of the styrene polymer is disperesed and trapped in the form of particles having a number-average mean particle diameter of 3-0.20μm and a particle diameter distribution of 1.15-1.35 and (3) the degree of swelling of the dispersed rubbery particles in toluene is in the range of 7-12. This composition is excellent in mechanical strengths, gloss and colorability and has a good balance among these properties.
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