US 7,842,779 B2Granted

Process for producing granular carboxylated-polymer particle and granular carboxylated-polymer particle

AssigneeSumitomo Seika Chemicals Co., Ltd.

InventorsYuichiro Morimitsu, Masatoyo Yoshinaka, Shinji Kobayashi

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Abstract

An object of the invention is to provide a method for easily producing granular carboxyl group-containing polymer particles, which have a high bulk density and readily swell in water. The invention provides a method for producing a granular carboxyl group-containing polymer particle by producing a carboxyl group-containing polymer particle, preparing an aggregate of the carboxyl group-containing polymer particles by providing the carboxyl group-containing particles with moisture so that the carboxyl group-containing polymer particles absorb the moisture in an amount of 5 to 25% by weight and form the aggregate, drying the aggregate of the carboxyl group-containing polymer particles, and then grinding the dried aggregate.

Claims6

Dependent claims

A method for producing a granular carboxyl group-containing polymer particle, which comprises:

producing carboxyl group-containing polymer particles by carrying out a reaction for producing a carboxyl group-containing polymer in a reaction mixture and then heating the reaction mixture to a temperature in a range of 80° C. to 130° C. so as to produce the carboxyl group-containing polymer particles,
preparing an aggregate of the carboxyl group-containing polymer particles by providing the carboxyl group-containing polymer particles with moisture so that the carboxyl group-containing polymer particles absorb the moisture in an amount of 5 to 25% by weight and form the aggregate,
drying the aggregate of the carboxyl group-containing polymer particles, and
then grinding the dried aggregate.

1 more element

Dependencies are inferred from the claim text.