Polyurethane foam composition

摘要

Single component compositions for making a moisture-cured polyurethane foam are disclosed. Foam produced from the compositions of the present invention produce very low foaming pressure due to their 60-95 percent open-cell content. After these compositions are applied and cure, they form a permanent seal around the perimeter of installed fenestration products.

主权项

1. A polyurethane foam forming composition delivery system comprising:
a container; a pressurized single component polyurethane foam forming composition comprising a mixture of (a) prepolymers containing free isocyanate groups in the range of 12 to 17 percent by weight, based on the prepolymer, which is produced by reacting a polyisocyanate with a polyol blend comprising a first polyol that is a triol having a molecular weight of in the range of from 600 to 2500 and a second polyol that is a diol, triol, or mixtures thereof having a molecular weight in the range of from 6000 to 10,000, wherein the first polyol and the second polyol are present in a parts by weight ratio in the of from 1:6 to 1:2; (b) a blowing agent; and (c) from 0.5 to 4 percent by weight a surfactant comprising the reaction product of a poly(alkyl siloxane) and a poly(alkylene oxide) copolymer, where the alkylene oxide are ethylene oxide, propylene oxide or butylene oxide, based on the total weight of the single component polyurethane foam forming composition, and
means for dispensing said pressurized single component polyurethane foam forming composition, wherein said polyurethane foam forming composition forms an open-cell structure foam having open cells in the range of from 60% to 95%.