| 摘要 |
PURPOSE:To obtain a contact medium having strength and a restoring property and excellent in water retentivity, by neutralizing acrylic acid alone or a mixture of acrylic acid and methacrylic acid and using a water-soluble polyfunctional vinyl monomer as a crosslinking agent to form a water retentive water-containing molded body. CONSTITUTION:A salt obtained by neutralizing acrylic acid alone or a mixture of acrylic acid and methacrylic acid to pH 5-8 and a water-soluble polyfunctional vinyl monomer as a crosslinking agent are used to obtain a crosslinked substance which is, in turn, used to constitute a water retentive water-containing molded body containing no air bubbles. As the acrylate monomer component to be used, the salt obtained by neutralizing acrylic acid alone and the mixture of acrylic acid and methacrylic acid to pH 5-8 is used. As the cation forming this salt, sodium, potassium or one or more compound selected from amines represented by general formula [wherein R<1>, R<2> and R<3> are hydrogen, a methyl group, an ethyl group, an isopropyl group or a group represented by A (wherein R<4> is hydrogen or a methyl group and X is an integer of 1-10)] is used. As the water-soluble polyfunctional vinyl monomer used as the crosslinking agent, bisacrylamides such as N,N'-methylenebisacylamide and polyhydric alcohol such as trimethylolpropane methacrylate are designated.
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