Process for producing powdered carboxyl-containing polymer

Details Process for producing powdered carboxyl-containing polymer Process for producing powdered carboxyl-containing polymer

1995-01-26

1996-08-06

Weber, Thomas R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523332, 523523, 523526, 5253297, 5253299, 5253302, C08F 2006

Patent

active

055434401

ABSTRACT:
A process for producing a powdered carboxyl-containing polymer comprising mixing a solution of a water-insoluble polymer containing a carboxyl group per molecule in a hydrophilic organic solvent (e.g., ethanol) and an aqueous solution of a dispersant comprising a neutralized copolymer of a carboxyl-containing unsaturated monomer and a (meth)acrylic ester to precipitate the water-insoluble polymer. Fine polymer particles free from adhesion or agglomeration are obtained efficiently. Since any residual unreacted carboxyl-containing monomers are dissolved out in water as a precipitating solvent, the resulting powdered polymer has a reduced residual content of the unreacted monomers which may be poisonous and is therefore useful as a base resin of cosmetics or a coating resin for applications involving contact with the skin.

REFERENCES:
patent: 3296172 (1967-01-01), Funck et al.
patent: 3389109 (1968-06-01), Harmon et al.
patent: 4049744 (1977-09-01), Masters

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