Catalysts for polyurethane foam polyol premixes containing halogenated olefin blowing agents
AssigneeHoneywell International Inc.
InventorsMichael A. Ross, Ronald Grossman, David J. Williams, Clifford P. Gittere
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Abstract
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.
Claims10
A storage stable foamable composition that has been stored for a period of at least two months comprising:
- a. a hydrohaloolefin blowing agent consisting essentially of transHCFO-1233zd, or transHFO-1234ze, or combinations of these,
- b. one or more polyols,
- c. one or more surfactants, and
- d. a catalyst system comprising at least a zinc metal and/or at least a bismuth metal, and at least one amine catalyst selected from n-metheyldicyclohexyl-amine, methyl(n-methylamino b-sodium acetate nonylphenol) 2-and combinations of these, wherein said foamable composition after said two month storage period has no substantial increase in gel time.
Dependencies are inferred from the claim text.