ISOCYANATE-CONTAINING MIXTURE FOR PREPARING OF ELASTIC POLYURETHANE FOAM COLD HARDENING Russian patent published in 1994 - IPC

FIELD: polymeric materials. SUBSTANCE: mixture containing polymethylenepolyphenylenepolyisocyanate and toluylenediisocyanate has additionally prepolymer with isocyanate groups number 19 ± 1,5 wt.-% on the basis of diphenylmethanediisocyanate and complex polyesterphenol with mol. mass 1800-3000. Elastic polyurethane foam and articles made of their show enhanced strength properties and decreased density (by 10-12%). Mixture is mixed with polyolic component and poured into metallic unheating shape. EFFECT: enhanced quality of material. 2 tbl