Sumitomo Chemical Company, Limited

Shin-ichi Isaoka

Shigenao Kawakami

Tutomu Shintani

Tatsumi Shibata

Shiro Sakai

Takeo Satomi

Naoyoshi Jinno

Wataru Thoma

Eiichi Hirata

Mamoru Suzuki

Shigenori Tajiri

Wataru Tohma

Hiroshi Tashiro

Shigenori Taziri

A process for preparing hydrolyzed acrylamide and methacrylamide polymers which comprises hydrolyzing a powdery acrylamide or methacrylamide polymer dispersed in a solvent mixture comprising water and at least one water-miscible organic solvent selected from the group consisting of ketones, nitriles, ethers and furans.

Method of hydrolyzing acrylamide and methacrylamide polymers

The growth of plants is promoted using a water-soluble cationic polymer obtained by polymerization of a quarternary ammonium compound of the following formula (I) alone or together with other vinyl monomers, ##STR1## wherein R.sub.1 is hydrogen or methyl, R.sub.2 and R.sub.3 are each a lower alkyl, R.sub.4 is a lower alkyl, allyl, a hydroxy(lower)-alkyl, benzyl or --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 group (in which m is 0 or 1), X is a halogen or methylsulfate and Y is --O(CH.sub.2).sub.n --, --NH--(CH.sub.2).sub.n -- (in which n is 1 to 4) or ##STR2##

Method for promoting growth of plants with cationic polymers

In the production of a water-soluble, cationic high polymer of (A) at least one of acrylamide and methacrylamide and (B) at least one of ammonium type monomers of either one of the formulas: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, R.sub.2 and R.sub.3 are each a lower alkyl group, R.sub.4 is a hydrogen atom, a lower alkyl group, an aryl group, a hydroxy(lower)alkyl group, a benzyl group or a group of the formula: --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 (m being an integer of 0 or 1), R.sub.5 .crclbar. is a group of either one of the formulas: --(CH.sub.2).sub.2 COO.crclbar. and --(CH.sub.2).sub.3 SO.sub.3 .crclbar., X is a halogen atom or an acid residue, Y is --O-- or --NH-- and n is an integer of 1 to 4, a process which comprises initiating the polymerization of the monomeric component (A) with or without a portion of the monomeric component (B) in an aqueous medium containing an organic solvent selected from the group consisting of acetone, acetonitrile, t-butanol, tetrahydrofuran and dioxane at a concentration of about 15 to 70% by weight until the polymerization proceeds to a certain extent and then continuing polymerization while adding the remaining portion of the monomeric component (B) thereto under the occasional supplementation of a water-miscible organic solvent thereto so as to keep an appropriate viscosity of the reaction system to produce the high polymer in a high yield with ease.

Water-soluble high polymers and their preparation

In the production of a water-soluble, cationic high polymer of (A) at least one of acrylamide and methacrylamide and (B) at least one of ammonium type monomers of either one of the formulas: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, R.sub.2 and R.sub.3 are each a lower alkyl group, R.sub.4 is a hydrogen atom, a lower alkyl group, an aryl group, a hydroxy(lower)alkyl group, a benzyl group or a group of the formula: --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 (m being an integer of 0 or 1), R.sub.5.sup.- is a group of either one of the formulas: --(CH.sub.2).sub.2 COO.sup.- and -(CH.sub.2).sub.3 SO.sub.3.sup.-, X is a halogen atom or an acid residue, Y is -O- or --NH-- and n is an integer of 1 to 4, a process which comprises initiating the polymerization of the monomeric component (A) with or without a portion of the monomeric component (B) in an aqueous medium containing an organic solvent selected from the group consisting of acetone, acetonitrile, t-butanol, tetrahydrofuran and dioxane at a concentration of about 15 to 70 % by weight until the polymerization proceeds to a certain extent and then continuing the polymerization while adding the remaining portion of the monomeric component (B) thereto under the occasional supplementation of a water-miscible organic solvent thereto so as to keep an appropriate viscosity of the reaction system to produce the high polymer in a high yield with ease.

Preparation of water-soluble high polymers

Water-soluble high molecular weight polymers, useful as coagulating agents, are prepared by initiating the polymerization of acrylamide or a monovinyl monomer mixture containing a predominant amount of acrylamide in an acetone-water mixture at a temperature of not lower than 5.degree.C but of lower than 25.degree.C in the presence of polyvinyl alcohol and a catalyst, the concentration of the monomer in the polymerization reaction mixture being 15 to 30 % by weight and the concentration of acetone in the acetone-water mixture being 15 to 35 % by weight, and continuing the polymerization reaction while controlling the viscosity of the reaction system by adding a water-miscible organic solvent having a small chain transfer coefficient to the reaction system with the progress of the polymerization reaction.

Process for producing high molecular weight acrylamide water-soluble

A polymeric flocculant composition having an excellent flocculation effect, which comprises (a) an acrylamide polymer containing 50 or more molar % of an acrylamide unit and (b) at least one amino resin precondensate selected from the group consisting of urea-formaldehyde, melamine-formaldehyde, guanidine-formaldehyde and dicyandiamide-formaldehyde, wherein the acrylamide polymer and the amino resin precondensate are admixed in a ratio of 90 : 10 to 99 : 1 by weight. The polymeric flocculant composition disclosed herein is useful for cleaning waste water.

Polymeric flocculant composition

High molecular weight acrylamide polymers useful as flocculants are obtained by copolymerizing acrylamide with a monovinyl monomer in a mixture of water and acetone in the presence of a redox type catalyst comprising a persulfate, an aliphatic amine and at least one Lewis acid selected from the group consisting of chlorides and bromides of aluminum, antimony, lithium and zinc.

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Kyoto, Japan

Shin-ichi Isaoka