flexible polyurethane foams formed by crushing a rigid foam in a direction perpendicular to the rise direction of the foam

摘要

The 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 in a direction perpendicular to the direction of rise of the foam is disclosed Flexible foams are obtained which do not show a major glass transition temperature between -100 °C and +25 °C and which have an anisotropy of 1.80 to 4.00.