Techno Polymer Company Limited

Junichirou Nitta

Takashi Kurata

Shinobu Fukumura

Yoshio Nakanishi

The present invention relates to a transparent butadiene-based rubber-reinforced resin produced by graft-polymerizing monomer components (b) comprising as main components an aromatic vinyl compound, a vinyl cyanide compound and an acrylic or methacrylic acid ester in the presence of particles of a butadiene-based rubber (a), said butadiene-based rubber-reinforced resin comprising, when observed by an electron microscope, a rubber phase having an average particle size of 150 to 350 nm and containing particles having a particle size of less than 150 nm in an amount of not more than 30% by weight and particles having a particle size of more than 350 nm in an amount of not more than 30% by weight; and containing acetone solubles having an intrinsic viscosity &lsqb;&eegr;&rsqb; of 0.2 to 0.4 dl/g when measured at 30&deg; C. in methyl ethyl ketone.

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Tokyo, Japan

Junichirou Nitta