Flexible polyurethane foams

Flexible polyurethane foam having a E′−100° C./E′+25° C. ratio of 1.3-15.

Process for preparing a flexible polyurethane foam by reacting a polyisocyanate (1), an isocyanate-reactive compound (2), having an average equivalent weight of at most 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 8, an isocyanate-reactive compound (3), having an average equivalent weight of more than 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 6 and water to prepare a rigid polyurethane foam and by crushing this rigid polyurethane foam.

Process for preparing a flexible polyurethane foam by reacting a polyisocyanate (1), a polyol (2) having a hydroxyl number of at least 150 mg KOH/g and an average nominal hydroxyl functionality of from 2 to 8, a polyol (3) having a hydroxyl number of from 10 to less than 150 and an average nominal hydroxyl functionality of from 2 to 6 and water to prepare a rigid polyurethane foam and by crushing this rigid polyurethane foam.

Reaction system comprising a polyisocyanate (1), an isocyanate-reactive compound (2) having an average equivalent weight of at most 374 and an average number of isocyanate-reactive hydrogen atoms;

• of from 2 to 8, an isocyanate-reactive compound (3) having an average equivalent weight of more than 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 6 and water wherein the amount of compound (2), compound (3) and water (per 100 parts by weight of polyisocyanate, compound (2), compound (3) and water) ranges from 2-20 parts by weight, 5-35 parts by weight and 1-17 parts by weight respectively.

Reaction system comprising a polyisocyanate (1), a polyol (2) having a hydroxyl number of at least 150 mg KOH/g and an average nominal hydroxyl functionality of from 2 to 8, a polyol (3) having a hydroxyl number of from 10 to less than 150 and an average nominal hydroxyl functionality of from 2 to 6 and water wherein the amount of polyol (2), polyol (3) and water (per 100 parts by weight of polyisocyanate, polyol (2), polyol (3) and water) ranges from 2-20 parts by weight, 5-35 parts by weight and 1-17 parts by weight respectively.

Process for preparing a rigid polyurethane foam by reacting a polyisocyanate (1), an isocyanate-reactive compound (2) having an average equivalent weight of at most 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 8, an isocyanate-reactive compound (3) having an average equivalent weight of more than 374 and an average number of isocyanate-reactive hydrogen atoms of from 2 to 6 and water, wherein the amount of compound (2), compound (3) and water (per 100 parts by weight of polyisocyanate, compound (2), compound (3) and water) ranges from 2-20 parts by weight, 5-35 parts by weight and 1-17 parts by weight respectively.

Process for preparing a rigid polyurethane foam by reacting a polyisocyanate (1), a. polyol (2) having a hydroxyl number of at least 150 mg KOH/g and an average nominal hydroxyl functionality of from 2 to 8, a polyol (3) having a hydroxyl number of from 10 to less than 150 and an average nominal hydroxyl functionality of from 2 to 6 and water wherein the amount of polyol (2), polyol (3) and water (per 100 parts by weight of polyisocyanate, polyol (2), polyol (3) and water) ranges from 2-20 parts by weight, 5-35 parts by weight and 1-17 parts by weight respectively.