Water blown polyurethane integral skin foam having improved abrasion resistance

摘要

This invention relates to a process for preparing integral skin foams from a specific reaction mixture. The isocyanate of this reaction mixture comprises a stable. liquid MDI based prepolymer containing an allophanate-modified MDI, and having an NCO content of 5 to 30%. This isocyanate comprises the reaction product of an allophanate-modified MDI and a polyether polyol. Integral skin foams prepared from these allophanate-modified isocyanate prepolymers exhibit improved properties and improved resistance to Taber abrasion in comparison to conventional isocyanate prepolymers.