Patent ID: 6582771
Filing Date: 2003-06-24
Classification: C08J,D06M,E02B

Abstract:
A method for producing a polyurethane/geofabric composite comprising:(1) impregnating at least one geofabric with a liquid solidifiable polyurethane composition which is the reaction product of a mixture comprising: COMPONENT A: a liquid polyisocyanate; COMPONENT B: a first isocyanate reactive component which does not contain catalyst, optionally, further comprising: Bi) 0-10% by weight, based on the total weight of COMPONENT B, of one or more low molecular weight diols or triols having hydroxyl equivalent weights of from about 31 to 99; and Bii) 0-10% by weight, based on the total weight of COMPONENT B, of a compound containing at least two amine groups; and COMPONENT C: a second isocyanate reactive component which has the same equivalent weight as COMPONENT B comprising 0.01 to 1% by weight, based on the total weight of COMPONENT B and COMPONENT C, of an organo-metal catalyst, optionally, further comprising: Ci) 0-10% by weight, based on the total weight of COMPONENT C, of one or more low molecular weight diols or triols having hydroxyl equivalent weights of from about 31 to 99; and Cii) 0-10% by weight, based on the total weight of COMPONENT C, of a compound containing at least two amine groups; â€ƒwherein COMPONENT B and COMPONENT C are used in a mix ratio such that a geltime of from three to twenty minutes at a temperature between 4Â° C. and 50Â° C. is achieved; (2) conforming at least one polyurethane-impregnated geofabric to a surface; and (3) allowing the liquid solidfiable polyurethane composition to cure to form a polyurethane/geofabric composite.