Mitsui Toatsu Chemicals, Incorporated

Wakabayashi Patent Agency

Takatoshi Mitsuishi

Hiroshi Itoh

Tadatoshi Honda

Jun Saitoh

Shuhei Ikado

Toshimi Nakagawa

Kenji Ema

Kenzo Fujii

Jun Saito

A copolymer consisting of 30 to 65 mole % of structural units of the formula ##STR1## 1 to 55 mole % of structural units of the formula ##STR2## and 10 to 60 mole % of structural units of the formula ##STR3## and having a number average molecular weight of 500 to 200,000.

Copolymers of acrylonitrile, styrene, and para-isopropenylphenol

A process for purifying an aqueous acrylamide solution which has been obtained through catalytic hydration of acrylonitrile in the presence of a copper-containing catalyst, by the steps of passing said solution through a OH-form strongly basic anion exchange resin layer and then, through a H-form cation exchange resin layer, is disclosed.

Process for purifying aqueous acrylamide solutions

A process for purifying an aqueous acrylamide solution which has been obtained by catalytic hydration of acrylonitrile with water in the presence of a copper-containing catalyst is disclosed, said process comprising passing said solution through a weakly basic anion exchange resin having primary and/or secondary amino groups, said resin being replaced with a new one after the use without regeneration.

Process for the purification of an aqueous acrylamide solution

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Isehara, Japan

Takatoshi Mitsuishi