POLYURETHANE FOAM PREMIXES CONTAINING HALOGENATED OLEFIN BLOWING AGENTS AND FOAMS MADE FROM SAME

摘要

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.

主权项

1. A storage-stable, foamable composition that has been stored for a period of at least three months, said composition comprising:
a. a hydrohaloolefin blowing agent, b. one or more polyols, c. one or more surfactants, and d. a catalyst system comprising at least a first metal and at least a second metal, and at least one amine catalyst selected from the group of amine catalysts having a pKa of not less than about 10, wherein said composition has been stored for at least three months.