POLYOL COMPOSITION AND METHOD OF PRODUCING RIGID POLYURETHANE FOAM THEREFROM.

摘要

A polyol composition for use in the production of a rigid polyurethane foam by the spray process, and a method of producing said foam from said composition by said process. This composition is characterized by comprising a polyol based on an ethylene-diamine/alkylene oxide adduct, a blowing agent based on a halogenated hydrocarbon in an amount smaller than that used in the conventional production or a rigid polyurethane foam by the spray process, and a large amount of water. More specifically the polyol composition comprises a polyol containing at least 45 % by weight of a polyol based on an ethylenediamine/alkylene oxide adduct and having a mean hydroxyl value of 250 to 550, and a blowing agent comprising at most 45 % by weight of a blowing agent based on a low-boiling halogenated hydrocarbon and 1 to 6 parts by weight of water per 100 parts by weight of said polyol.