Production of hydrogels
First Claim
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1. A method for producing hydrogels which comprises that, in producing the hydrogel by water-in-oil type inverse phase suspension polymerization of an α
- ,β
-unsaturated carboxylic acid monomer and/or its alkali metal salt in the presence or absence of a cross-linking agent, a carboxyl-containing polymer having affinity to the organic solvent is used as the dispersing agent.
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Abstract
The invention is to provide the methods for producing highly water-absorbable and water-retainable hydrogels having a large particle diameter together with a sufficient gel strength. The method is characterized by use of a specific dispersing agent in the water-in-oil type inverse phase suspension polymerization of an α,β-unsaturated carboxylic acid and/or its alkali metal salt. Due to the high water-absorbability and water-retainability, along with the superior gel strength and the stable gel structure, the hydrogels of the invention enlarge the conventional range of usages.
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4 Claims
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1. A method for producing hydrogels which comprises that, in producing the hydrogel by water-in-oil type inverse phase suspension polymerization of an α
- ,β
-unsaturated carboxylic acid monomer and/or its alkali metal salt in the presence or absence of a cross-linking agent, a carboxyl-containing polymer having affinity to the organic solvent is used as the dispersing agent. - View Dependent Claims (2, 3, 4)
- ,β
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