METHOD OF MANUFACTURING ELASTIC POLYURETHANE-FOAM PRODUCTS AND ELASTIC POLYURETHANE-FOAM PRODUCTS Russian patent published in 1997 - IPC

FIELD: polymer materials. SUBSTANCE: invention relates to manufacturing, in closed mold, polyurethane-foam products usable in furniture industry, in vehicles, etc., and, in particular, enables manufacturing, not recurring to ozone-destroying Freon, products with by 5-15% reduced apparent density and simultaneously improved other physico-mechanical properties due to using mixture composed of (i) 97-99 weight parts of polyoxypropylenepolyoxyethylenetriol having 10-18% terminal ethylenoxide groups and hydroxyl number 26-36 mg KOH/g and (ii) 1-3 weight parts of oxypropylated ethylendiamine and/or diethylenetriamine with hydroxyl number 450-800 mg KOH/g, and also 3-5 weight parts per 100 weight parts of mixture of water and aromatic di- and polyisocyanate containing 31-45% isocyanate groups, which provides ratio of isocyanate groups to active hydrogen atoms (0.8-1.2):1. Characteristics of products: apparent density 36-41 kg/cu.m, destroying stress on stretching 105-120 kPa, rupture elongation 152- 165%, and 50% compression set for 72 h - 2.8-3.5%. EFFECT: improved performance characteristics of products. 6 cl, 1 tbl