Armstrong, Westerman, Hattori, McLeland & Naughton
Process for preparing rubber-modified styrene resins
 A feed containing 100 parts by weight of reactants consisting of 88 to 98% by weight of a styrene-based monomer or its mixture with other comonomers and 2 to 12% by weight of high-viscosity rubber with a viscosity of 400 to 2,000 centipoises in a 5% by weight styrene solution at 25.degree. C., 0.01 to 0.2 part by weight of an organic peroxide, and 0 to 30 parts by weight of an inert organic solvent is supplied continuously to the first complete mixing type reactor where it is polymerized under the condition prevailing before the rubber phase inversion, the initial reaction mixture is withdrawn continuously and supplied to the second complete mixing type reactor where the rubber is transformed into particles with the conversion of the monomers in the reactants held at 40% by weight or less, and the conversion is raised in the following reactor to yield impact-resistant rubber-modified styrene resins containing rubber particles with a weight average particle diameter of 1.5 to 4 .mu.m. 
Nippon Steel Chemical Co., Ltd.
C C
C08F C08F
inventional inventional
Masanari Akifumi Yoshitaka Hiroyuki
Fujita Hayakawa Sakamaki Shibata