| 摘要 |
PURPOSE: A rubber-containing styrene resin and process for producing the same are provided which can control the morphology and particle size of a dispersed rubber simply in accordance with its use. CONSTITUTION: The resin comprises a styrene resin matrix and a rubber component dispersed in particles. In the resin, the graft ratio of a styrene monomer relative to the rubber component is not less than 1, the particle size of the dispersed rubber component is 0.1 to 3 micrometer, and the equation; Mn = a T + b is satisfied in which Mn is the number average molecular weight of the matrix resin; T is the conversion of the styrene monomer; a is a constant greater than 0; and b is a constant of 0 or greater. The rubber component may be a butadiene-series rubber. The particle-size distribution of the dispersed rubber component may have, for example, two peaks. Such styrene resin can be produced by, in the presence of a rubber component, polymerizing at least a styrene monomer at a graft ratio of not less than 1 under such conditions that the relationship between the conversion T of the styrene monomer and the number average molecular weight Mn of the polymer can be approximated by a linear equation.
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