POLYURETHANE COMPOSITION Russian patent published in 2000 - IPC

FIELD: chemistry of polymers, more particularly manufacture of large-size elastic products. SUBSTANCE: described is polyurethane composition comprising polyfurite polyurethane prepolymer and liquid hardener based on 3,3'-dichloro-4,4'- diaminodiphenyl methane and polyoxytetramethylene glycol with molecular weight of 1000. Composition comprises liquid hardener based on 3,3'-dichloro-4,4'- diaminodiphenyl methane and polyoxytetramethylene glycol at 0.67-0.33 molar ratio and urethane prepolymer prepared from 2.2 moles of 2.4-toluylene diisocyanate and 1.0 more of oligooxyethylene glycol with molecular weight of 400, ratios of reagents being as follows, wt %: polyfurite urethane prepolymer, 56.4-62.2; urethane prepolymer based on 2.2 moles of 2.4-toluylene diisocyanate and 1.0 mole of oligooxyethylene glycol with molecular weight of 400, 8.6-13.4; liquid hardener based on 3,3'-dichloro-4,4'- diaminodiphenyl methane and polyoxytetramethylene glycol at 0.67: 0.33 molar ratio thereof, the balance. EFFECT: high viability of reaction mixture and polyurethane materials with Shore hardness of more than 90 conventional units. 2 ex, 4 tbl