Method for producing polyester resin
AssigneeKao Corporation
InventorsYuichi Kono, Kazuma Yoshida, Hidekazu Yawata, Seiki Yoshioka, Shinpei Oota
Life of this patent
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Abstract
A method for producing polyester resin includes: esterifying an alcoholic component, and an acid component containing polyvalent carboxylic acid and/or an ester-forming derivative thereof in a reaction solution. A condition of reaction pressure is changed from a pressurized state to a normal pressure state, or to a depressurized state under a condition (I) that an acid-based extent of reaction of the esterification is 76-94%, and a condition (II) that an undissolved acid component is present in the reaction solution.
Claims11
A method for producing polyester resin, comprising:
- esterifying an alcoholic component with an acid component containing at least one of a polyvalent carboxylic acid, and an ester-forming derivative thereof in a reaction solution, and
- changing a reaction pressure from a pressurized state to a normal pressure state, or from a pressurized state to a depressurized state during the esterification,
- wherein
- the change is effected (I) when an extent of the esterification is 76-94%, and (II) an undissolved acid component is present in the reaction solution.
A method for producing polyester resin, comprising:
- esterifying an alcoholic component with an acid component containing at least one of a polyvalent carboxylic acid, and an ester-forming derivative thereof in a reaction solution, and
- changing a reaction pressure from a pressurized state to a normal pressure state, or from a pressurized state to a depressurized state during the esterification,
- wherein
- the change is effected (I) when an extent of the esterification is 76-94%, and (II) an undissolved acid component is present in the reaction solution,
- wherein the alcoholic component comprises an alkylene oxide adduct of bisphenol A, and
- wherein the alkylene oxide adduct of bisphenol A is an ethylene oxide adduct or a propylene oxide adduct of bisphenol A.
The method of claim l, wherein the alcoholic component comprises an alcohol having a pair of adjacent bonded secondary carbon atoms which are each bonded to a hydroxy group.
Dependencies are inferred from the claim text.