Patent ID: 8029824
Filing Date: 2011-10-04
Classification: A61L,C08F,C08L

Abstract:
1. A hydrogel of an interpenetrating network structure wherein a first network structure is uniformly entwined with a second network structure throughout the gel, obtained by polymerizing and crosslinking a first monomer component to form the first network structure; introducing a second monomer component into the first network structure; and polymerizing and crosslinking the second monomer component to form the second network structure entwined with the first network structure, characterized in that 10 mol % or more of the first monomer component is an unsaturated monomer having an electric charge selected from the group consisting of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid, methacrylic acid, and a salt thereof, 60 mol % or more of the second monomer component is an electrically neutral unsaturated monomer selected from the group consisting of acrylamide, N-isopropyl acrylamide, vinylpyridine, styrene, methyl methacrylate, a fluorine-containing unsaturated monomer, hydroxyethyl acrylate and vinyl acetate, the molar ratio of the first monomer component to the second monomer component is from 1:2 to 1:100, and after the second monomer component is polymerized and crosslinked, the degree of crosslinking is set to be lower than the degree of crosslinking of the first monomer component being polymerized and crosslinked.