Method for production of hydrophilic resin
AssigneeNippon Shokubai Co., Ltd.
InventorsYoshio Irie, Katsuhiro Kajikawa, Kunihiko Ishizaki, Takumi Hatsuda
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Abstract
In the production of an acrylate polymer by the steps of preparing a water-soluble unsaturated monomer having a ratio of neutralization in the range of 30 to 100 mol % and containing 50 to 100 mol % of an acrylate and then polymerizing the monomer, a method for the production of a hydrophilic resin which comprises using a water-soluble unsaturated monomer having a β-hydroxy propionic acid (salt) content of not more than 1,000 ppm. The hydrophilic resin obtained by this method exhibits excellent physical properties and has only a small residual monomer content. Further, a residual monomer content neither occurs nor increases in any using conditions.
Claims25
A method for the production of a hydrophilic resin which comprises polymerizing a water-soluble unsaturated monomer containing 50 to 100 mol % of an acrylate having a ratio of neutralization in the range of 30 to 100 mol % and not more. than 1,000 ppm of β-hydroxy propionic acid (salt).
A method for the production of a hydrophilic resin which comprises polymerizing a water-soluble unsaturated monomer containing 50 to 100 mol % of an acrylate having a ratio of neutralization in the range of 30 to 100 mol % and not more than 1,000 ppm of β-hydroxy propionic acid (salt) and then cross-linking the surface region of the resultant acrylate polymer by treating said polymer with a second cross-linking agent having at least two groups capable of reacting with the functional group within the molecular unit of said polymer.
An acrylic acid salt polymer composition which contains 1 to 1000 ppm of β-hydroxy propionic acid (salt) and not more than 100 ppm of a residual monomer.
Dependencies are inferred from the claim text.