New flexible polyurethane foams

摘要

Provided are two processes for a rigid polyurethane foam, which may be crushed to form a flexible foam, and which desirably has a free rise core density of 3-27kg/m3. The first process consists of reacting 2-20 parts by weight of a polyisocyanate, 5 to 35 parts by weight of an isocyanate-reactive compound having an average equivalent weight of at most 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 8, 1-17 parts by weight of a second isocyanate-reactive compound having an average equivalent weight of at most 374 and an average number of isocyanate-reactive hydrogen atoms of from2 to 6, and the balance water. The second process consists of reacting reacting 2-20 parts by weight of a polyisocyanate, 5 to 35 parts by weight of a polyol compound having a hydroxy number of at least 150mg KOH/g and an average nominal hydroxy functionality of from 2 to 8, 1-17 parts by weight of a second polyol compound having a hydroxy number of from 10 to less than 150mg KOH/g and an average nominal hydroxy functionality of from2 to 6, and the balance water.