Patent ID: 6528577
Filing Date: 2003-03-04
Classification: C08G,C09K

Abstract:
A water retention material for use as a material selected from the group consisting of an indoor humidity control material, gardening soil additive, agriculture moisture control material and desert afforestation material,the water retention material comprising a polyurethane hydrogel prepared by crosslinking and curing a terminal isocyanate-containing polyurethane resin (C) in the presence of water at a water: resin (C) weight ratio of more than 9:1, the resin (C) being a reaction product of a polyisocyanate (A) and a liquid polyol (B), and the polyol (B) containing 70 wt. % or more of a random copolymer prepared by copolymerization of ethylene oxide (a) and propylene oxide (b) at an ethylene oxide (a): propylene oxide (b) weight ratio of 50:50 to 90:10.