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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkira Miyamoto, Senzo Shimizu, Fumitaka Satoh, Yasumitsu Higuchi, Toshiyuki Abe, Kohji Yamamoto
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Processes for producing an oligoester and producing unsaturated polyester resin by use of the oligoester using unsaturated dibasic acid or its anhydride and isophthalic acid as dibasic acid components, and propylene oxide as a polyol component, characterized by (a) the step of reacting isophthalic acid with propylene oxide in the presence of an amine compound catalyst to form an oligoester, (b) the step of removing volatile components from the oligoester by heating it at a temperature range of 180.degree.-300.degree. C., (c) the step of treating the resulting oligoester with silica-alumina compound having adsorbing property, and (d) the step of reacting the oligoester so treated with the unsaturated dibasic acid or its anhydride.
A process for producing an oligoester having 0.02-0.5 ether bond for one residue of isophthalic acid which comprises (a) the step of reacting 1 mol of isophthalic acid with 1.1-3.3 mols of propylene oxide in a reaction medium in the presence of an amine compound catalyst, (b) the step of removing volatile components from the oligoester obtained in step (a) by heating the oligoester at a temperature range of 180.degree.-300.degree. C. and (c) the step of treating the resulting oligoester with a silica-alumina compound having adsorbing property.
A process for producing unsaturated polyester resin from an oligoester and unsaturated dibasic acid or its anhydride which comprises:
Dependencies are inferred from the claim text.