PRODUCTION OF WATER ABSORBABLE COMPOSITE

摘要

PURPOSE: To produce an excellent water-absorbing complex having high strength by fusing together a water-soluble resin powder on the outer surface of a low-melting layer of a tape-like laminate or the like comprising high-melting and low-melting synthetic resin layers and then by subjecting the water-soluble resin powder to crosslinking treatment with a foaming crosslinking agent. CONSTITUTION: This water-absorbing complex is produced by the following steps: (1) the formation of a tape-like laminate (or its split fiber or conjugated fiber) where the laminate comprises a high-melting synthetic resin layer 1 and a low-melting synthetic resin layer 2 and the low-melting layer is disclosed from the surface; (2) heating the laminate up to the vicinity of the melting point of the low-melting resin and fusing together a water-soluble resin (e.g. polyacrylic acid or its copolymer or the like) on the outer surface of the low-melting layer discolored from the surface; (3) making the water-soluble resin contact with a foaming aqueous solution comprising a crosslinking agent (e.g. sorbitol polyglycidyl ether or the like) and a foaming agent such as a surfactant and applying crosslinking treatment. The high-melting synthetic resin is e.g. a crystalline polypropylene or the like. The low-melting synthetic resin is e.g. an unsaturated carboxylic acid-grafted modified polyolefin or the like. The laminate may have three layers e.g. consisting of the layer 2, the layer 1 and the layer 2 as the tape-like laminate.