Production of hydrogels

Details Production of hydrogels Production of hydrogels

C - Chemistry, Metallurgy

08

K

402/125, 400/133

C08K 5/09 (2006.01) A61L 15/60 (2006.01) C08F 20/06 (2006.01) C09K 17/22 (2006.01)

Patent

CA 1211897

ABSTRACT OF THE DISCLOSURE Process are provided herein for producing highly water-absor- bable and water-retainable hydrogels having a large particle diameter together with a sufficient gel strength. The process involves the use of a specific dispersing agent in the water-in-oil type inverse phase suspension polymerization in an organic solvent polymerization medium of an .alpha. , .beta. -unsaturated carboxylic acid and/or its alkali metal salt in the presence or absence of a cross-linking agent. The improvement involves using a carboxyl-containing polymer having an affinity to the organic solvent which is used as the dispersing agent. Due to the high water- absorbability and water-retainability, along with the superior gel strength and the stable gel structure, the hydrogels provided herein enlarge the conventional range of usages. Thus, they may be used for various sanitary materials, for example, disposable diapers, tampons, sanitary cottons, bandages, napkin and other usages where they contact the human body, without any obstacle. They may also be used in various commercial uses, for instance, separating agent for water in oil, other dehydrating or drying agent, water-retaining agent for plant and soil, liquid chromatography carrier and other usages where its water-absorbing and water-retaining abilities are utilized. The hydrogel may be added with coloring agents perfumery or other additives or various inorganic and inorganic fillers. Furthermore, the hydrogel may be used compositely with paper, fiber, textile and other different materials.

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