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US 4,287,333 AGranted
Process of preparing finely divided thermoplastic resins
AssigneeNational Distillers and Chemical Corporation
InventorDorothee M. McClain
Life of this patent
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Abstract
Powders of thermoplastic resins such as polyethylene homopolymer and ethylene-vinyl acetate copolymer are obtained by agitating molten resin in admixture with water and in the presence of a dispersing amount of an alkali metal salt of an organophosphate ester. The particle size distribution of the dispersed resin can, if desired, be regulated by the addition of base thereto.
Claims11
a process for preparing in finely divided form a solid organic polymeric thermoplastic resin consisting of:
- (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersion-forming amount of an alkali metal salt of an organo-phosphate ester dispersing agent, to provide a hot aqueous dispersion of the resin;
- and,
- (b) cooling the dispersion to below about 100.degree. C. to provide solid particles of resin.
A process for preparing in finely divided form a solid organic polymeric thermoplastic resin consisting of:
- (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersion-forming amount of an alkali metal salt of an organophosphate ester dispersing agent in the presence of a base to regulate the particle size distribution of the dispersed resin;
- and,
- (b) cooling the dispersion to below about 100.degree. C. to provide solid particles of resin of controlled particle size distribution.
Dependencies are inferred from the claim text.