(Meth) acrylic acid type polymer and unsaturated polyalkylene glycol type copolymer, and methods for production thereof
AssigneeNippon Shokubai Co., Ltd.
InventorsAtsuro Yoneda, Takahiro Tsumori, Yoshikazu Fujii, Shigeru Yamaguchi
Life of this patent
Estimating the term…
Abstract
This invention concerns a (meth)acrylic acid type polymer, wherein the value S representing the quantity of an sulfur element introduced which is defined by the formula, S=(quantity of S contained in polymer)/(total quantity of S)×100, is not less than 35. This (meth)acrylic acid type polymer is a water-soluble polymer of a low molecular weight which has only a small impurity content, entails no precipitation of an impurity during the preservation at a low temperature, and excels in dispersibility, chelating ability, and an anti-gelling property.
Claims18
A (meth)acrylic acid type polymer, wherein the value S representing the quantity of an sulfur element introduced which is defined by the formula, S=(quantity of S contained in polymer)/(total quantity of S)×100, is not less than 35.
A method for the production of a (meth)acrylic acid type polymer, characterized by using as an initiator the combination of one or more species respectively of a persulfate and a bisulfite, wherein the bisulfite is used in a proportion in the range of 0.5-5 by mass ratio relative to the mass of the persulfate taken as 1, the total quantity of the persulfate and the bisulfite to be added to the reaction system of polymerization is in the range of 2-20 g per mol of the monomer to be polymerized, and the polymerization temperature is in the range of 25-99° C.
An unsaturated polyalkylene glycol type copolymer, wherein the copolymer is produced by copolymerizing a (meth)acrylic acid type monomer A and an unsaturated polyalkylene glycol type monomer B, the copolymer possesses sulfur oxygen acid at the terminal thereof, and the value S representing the quantity of the sulfur element introduced which is defined by the formula, S=(quantity of S contained in the polymer)/(total quantity of S)×100, is not less than 3.
A method for the production of an unsaturated polyalkylene glycol type copolymer by the copolymerization of a (meth)acrylic acid type monomer A and an unsaturated polyalkylene glycol type monomer B, wherein the combination of one or more species respectively of a persulfate and a bisulfite is used as an initiator.
Dependencies are inferred from the claim text.