Nippon Zeon Company, Ltd.

Hiromitsu Kadono

Tadao Natsuume

Yoshiaki Miki

A hydraulic cement composition comprising hydraulic cement and a copolymer of 60 to 85 mol % of an alpha,beta-unsaturated dicarboxylic acid and 40 to 15 mol % of an olefin or a water-soluble salt thereof, said copolymer having a number average molecular weight of 300 to 10,000 and containing not more than 10% by weight of a high-molecular-weight polymer having a molecular weight of at least 20,000.

Hydraulic cement composition

A process for producing a water-soluble acid amide compound which comprises heating (a) a carboxylic acid compound having at least one carboxyl group in the molecule and being incapable of forming a 5-membered cyclic acid imide linkage and (b) a primary or secondary amine compound in an aqueous medium to introduce an acid amide linkage into the molecule.

Process for producing water-soluble acid amide compounds

A novel water-soluble copolymer which is characterized by being an addition copolymer comprising 5-70 mole % of (a) an N-substituted .alpha.,.beta.-unsaturated dicarboxylic acid 5-membered ring imide having a sulfo or sulfoxy group-containing residue attached to the nitrogen atom, 30-95 mole % of (b) an .alpha.,.beta.-unsaturated aliphatic monocarboxylic acid and 0-50 mole % of (c) and .alpha.,.beta.-unsaturated aliphatic dicarboxylic acid and having a number average molecular weight of 500-5,000,000, and a salt thereof.

Novel water-soluble copolymer

A process for producing a water-soluble dicarboxylic acid imide compound which comprises adding a primary amine compound to an aqueous solution of a water-soluble salt of a dicarboxylic acid compound containing at least one dicarboxylic acid unit capable of forming a 5-membered cyclic acid imide linkage and heating the mixture to introduce an acid imide linkage into the molecule.

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Yokohama, Japan

Hiromitsu Kadono