SOLVENT-FREE POLYURETHANE-UREA FOAM SHEET, METHOD FOR PRODUCTION THEREOF, AND SYNTHETIC LEATHER

摘要

Disclosed is a solvent-free polyurethane-urea foam sheet which is produced by foaming a solvent-free urethane resin composition with air or an inert gas, shaping the foamed material into a sheet-like material, and hardening the sheet-like material by heating. The solvent-free urethane resin composition comprises (A) a prepolymer produced by the reaction between a diisocyanate compound with a polyol having a molecular weight of 500 to 3000, (B) a cross-linking agent comprising a polyol having 2 to 4 hydroxy groups on average, and (C) water, wherein the content of an isocyanate group in the component (A) is 7.0 to 12.0% by mass, the residual amount of an isocyanate group in a mixture of the components (A) and (B) is 2.0 to 5.0% by mass, the residual amount of an isocyanate group in a mixture of the components (A), (B) and (C) is 0.01 to 0.5% by mass, and the number average molecular weight of all of the polyol used as a raw material for the component (A) and the polyol of the component (B) is 600 or more. Also disclosed is a method for producing the sheet. Further disclosed is a synthetic leather comprising the sheet.