초록 ▼

Process for preparing a flexible polyurethane foam by reacting a polyisocyanate and two different polyols under foam forming conditions so as to prepare a rigid foam and by crushing the rigid foam so obtained. Flexible foams are obtained which do not show a major glass transition temperature between

Process for preparing a flexible polyurethane foam by reacting a polyisocyanate and two different polyols under foam forming conditions so as to prepare a rigid foam and by crushing the rigid foam so obtained. Flexible foams are obtained which do not show a major glass transition temperature between -100.degree. C. and +25.degree. C.

대표청구항 ▼

[ We claim:] [1.] Process for preparing a flexible polyurethane foam comprising preparing a rigid polyurethane foam comprising 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 at

[ We claim:] [1.] Process for preparing a flexible polyurethane foam comprising preparing a rigid polyurethane foam comprising 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 of the combined weight of polyisocyanate, compound (2), compound (3) and water) is from 2-20 parts by weight, 5-35 parts by weight and 1-17 parts by weight respectively, and crushing the rigid foam obtained.