Resinous particles for coating composition and its production
AssigneeNippon Paint Co., Ltd.
InventorsSakuichi Konishi, Yukio Omori, Hiroyoshi Kataoka
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Abstract
A process for preparing resinous particles for a coating composition, which comprises the steps of (1) subjecting an aqueous resin composition having an ionic group and no material solubility or dispersibility in water is dissolved or dispersed in an aqueous medium by at least partly neutralizing the ionic group to treatment with a powdering agent while applying thereto an operation for pulverization to deposit the resin in a particulate form and (2) recovering the deposited resinous particles from the aqueous medium.
Claims12
A process for preparing resinous particles for a coating composition which comprises the steps of
- (1) treating
- (A) an aqueous resin dispersion or solution, which comprises
- (a) a resin having carboxyl groups or primary, secondary or tertiary amino groups and no material dispersibility or solubility in water, which resin has been rendered dispersible or soluble in water by at least partly neutralizing the carboxyl groups or the amino groups with a base or an acid, respectively, and
- (b) a water-insoluble crosslinking agent which is crosslinkable with functional groups in the resin,
- with
- (B) an acidic substance or a basic substance as a powdering agent, said acidic substance being used when the resin is one having carboxyl groups, said basic substance being used when the resin is one having primary, secondary or tertiary amino groups,
- under conditions which will deposit the resin in particulate form together with the crosslinking agent uniformly dispersed therein, and
- (2) recovering the deposited resinous particles containing the crosslinking agent from the aqueous medium.
A resinous particle prepared by the process according to claim 13.
Dependencies are inferred from the claim text.