Process for producing alkyd resin
AssigneeKansai Paint Co., Ltd.
InventorsChicara Kawamura, Kei Ito, Ichiro Yoshihara, Nobushige Numa
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Abstract
Processes for producing within a short time transparent alkyd resins which are substantially free of occurrence of foreign matters or filtration residues are disclosed, which comprise depolymerizing polyester resins whose chief starting material is terephthalic acid and which have been recovered from waste materials and regenerated, with use of a polyhydric alcohol component having tetra- or higher hydric alcohol, and thereafter adding thereto a polybasic acid component (and if necessary a fatty acid component) to effect an esterification reaction.
Claims30
A process for producing an alkyd resin having an oil length of 30-70%, which is characterized by comprising dissolving polyester resin whose chief starting material is terephthalic acid and which has been recovered from waste materials and regenerated, in an alcohol mixture of tetra- or higher hydric alcohol with tri- or lower polyhydric alcohol, the weight ratio of the former/latter being within a range of 0.2-50, depolymerizing the same in the presence of a depolymerization catalyst, and then adding thereto a polybasic acid component and a fatty acid component to effect an esterification reaction, the used amount of said polyester resin being 5-40% by weight, based on the sum of the polyester resin, the alcohol mixture, the polybasic acid component and the fatty acid component.
A process for producing an alkyd resin having an oil length of 30-70%, which is characterized by comprising dissolving polyester resin whose chief starting material is terephthalic acid and which has been recovered from waste materials and regenerated, in a mixture of an alcohol component, in which the weight ratio of tri- or lower polyhydric alcohol to tetra- or higher hydric alcohol as the former/latter is within a range of 0-20, with oil and fat and/or fatty acid, or in their reaction mixture;
- depolymerizing the same in the presence of a depolymerization catalyst;
- and then adding thereto a polybasic acid component to effect an esterification reaction, the used amount of said polyester resin being 5-40% by weight, based on the sum of the polyester resin, the alcohol component, the oil and fat and/or the fatty acid and the polybasic acid component.
Dependencies are inferred from the claim text.