초록 ▼

A highly water-absorbing but less water-soluble hydrogel is produced by polymerizing at least one hydrophilic ethylenically unsaturated monomer, e.g., ethylenically unsaturated carboxylic acid, ethylenically unsaturated sulfonic acid, or derivatives thereof, in the presence of a specific difunctiona

A highly water-absorbing but less water-soluble hydrogel is produced by polymerizing at least one hydrophilic ethylenically unsaturated monomer, e.g., ethylenically unsaturated carboxylic acid, ethylenically unsaturated sulfonic acid, or derivatives thereof, in the presence of a specific difunctional compound, e.g., polyethyleneglycol diglycidyl ether, polyethyleneglycol diacrylate, etc.

대표청구항 ▼

A process for producing a highly water-absorbing but less water-soluble hydrogel comprising polymerizing at least one hydrophilic ethylenically unsaturated monomer selected from the group consisting of a carboxylic acid containing an ethylenically unsaturated group, a sulfonic acid containing an eth

A process for producing a highly water-absorbing but less water-soluble hydrogel comprising polymerizing at least one hydrophilic ethylenically unsaturated monomer selected from the group consisting of a carboxylic acid containing an ethylenically unsaturated group, a sulfonic acid containing an ethylenically unsaturated group, and derivatives thereof to form a homopolymer or copolymer of said hydrophilic ethylenically unsaturated monomer, or a mixture of at least 50% of said hydrophilic ethylenically unsaturated monomer and less than 50% of an ethylenically unsaturated monomer copolymerizable therewith other than said hydrophilic ethylenically unsaturated monomer, in the presence of 0.005% to 20% by weight based on the total weight of the ethylenically unsaturated monomers of at least one difunctional compound selected from the group consisting of compounds represented by the formula (1): [Figure] (1) wherein l is an integer of from 5 to 100.