Styrene/acrylic-type polymers for use as surface sizing agents

Paper making and fiber liberation – Processes and products – With coating after drying

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1621681, 427391, D21H 1920

Patent

active

051396149

ABSTRACT:
A process is disclosed for the preparation of styrene/acrylic type polymers which are useful in the sizing of paper. The process comprises polymerizing the monomers in an alcohol/water mixture at reflux temperature in the presence of a free-radical generating catalyst. The catalyst is added portion-wise over the course of the reaction and the resultant polymer is neutralized while substantially simultaneously separating the alcohol/water mixture and adding water to recover a product of less than 25% polymer solids.

REFERENCES:
patent: 2851448 (1958-09-01), Slocombe et al.
patent: 4481244 (1984-11-01), Haruta et al.

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