Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Kenji Tsuboi

Hiroshi Itoh

Toshihiko Takaki

Atsuhiko Nitta

Tsugio Matsubara

Kenichi Nakamura

Toshiki Oyanagi

Kenzo Seita

Atsushi Ito

Hirotoshi Doki

Shouichi Araseki

Susumu Oyama

Takashi Yodoya

Shinya Yamagami

A polymer (B) is prepared by polymerizing one or more vinyl monomers (c) in the presence of a polymer (A) prepared by polymerizing one or more vinyl monomers (a) selected from the group consisting of vinyl monomers represented by the general formula (1):

Polymer and applications thereof

A hydraulic cement composition comprising as an effective component a water-soluble amphoteric polymer obtained by Hofmann degradation reaction of an .alpha.,.beta.-unsaturated carbonamide polymer or a copolymer of .alpha.,.beta.-unsaturated carbonamide and an anionic monomer having a weight average molecular weight of 1,000-1,000,000. The primary amino group produced as a result of the Hofmann degradation reaction provides excellent cement dispersing capabilities.

Admixture for hydraulic cement

This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time. This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and, N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.

Catonic acrylamide polymers and the applications of these polymers

This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time. This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.

Cationic acrylamide polymers and the applications of these polymers

Method of manufacturing cationic acrylamide polymers, cationic

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Kanagawa, Japan

Kenji Tsuboi