Showa Highpolymer Co., Ltd.

Isamu Niikura

Eiichiro Takiyama

Takao Hokari

Yositaka Hatano

An unsaturated alkyd having a number-average molecular weight of at least 5000 and having terminal carboxyl groups is provided by esterification and then deglycolization reaction of an .alpha.,.beta.-unsaturated polybasic acid or an polyhydroxy alcohol followed by reaction with polybasic acid anhydride to substitute more than 10 mole % of terminal hydroxyl groups with carboxyl groups. High molecular weight unsaturated polyester resin is also provided by formulating the unsaturated alkyd with a copolymerizable monomer such as styrene. The polyester resin can be widely used in a various applications by employing the excellent physical properties thereof.

High-molecular unsaturated polyester resin

A method for producing a high molecular weight saturated polyester comprising adding to a saturated polyester with the terminal group being substantially hydroxyl group, having a number average molecular weight of 5,000 or more and being in the molten state, diisocyanate containing isocyanate group the amount of which corresponds to 1/10 to 2 equivalents of the amount of the hydroxyl group.

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Takasakishi, Japan

Isamu Niikura