Hitachi Chemical Company, Ltd.

Hirobumi Izumi

Tsutomu Toyoda

Iwao Maekawa

Kazuyuki Tanaka

Tadashi Fujii

Tadashi Fuzii

A method for the manufacture of a polybutadiene-modified unsaturated polyester, comprising the steps of: (I) reacting (A) an .alpha.,.beta.-unsaturated dicarboxylic acid or anhydride with (B) at least one compound selected from the group consisting of (i) air-drying allyl compounds, (ii) animal and vegetable oils or derivatives thereof and (iii) dicyclopentadiene or derivatives thereof at a (B)/(A) molar ratio within the range of from 0.8 to 1.2, and (II) reacting the resultant reaction product with (C) at least one compound selected from the group consisting of .alpha.,.omega.-polybutadiene glycol and .alpha.,.omega.-hydrogenated polybutadiene glycol. A polybutadiene-modified unsaturated polyester comprising said polybutadiene-modified unsaturated polyester and a polymerizable monomer possessing at least one double bond.

Method for manufacture of polybutadiene-modified unsaturated polyester

An unsaturated polyester resin composition for coating metal substrates, comprising an unsaturated alkyd component and a polymerizable vinyl monomer, said unsaturated alkyd component selected from the group consisting of:

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Hitachi, Japan

Hirobumi Izumi