Amine catalysts for polyurethane foams
AssigneeHoneywell International Inc.
InventorsMichael Van Der Puy, David J. Williams, Haridasan K. Nair, David Nalewajek
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Abstract
The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to open-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 sterically hindered amine catalyst.
Claims20
A polyol premix composition which comprises a combination of a blowing agent, a polyol, a silicone surfactant, and a sterically hindered amine catalyst;
- wherein the blowing agent comprises a hydrohaloolefin, and optionally a hydrocarbon, fluorocarbon, chlorocarbon, fluorochlorocarbon, halogenated hydrocarbon, CO2 generating material, or combinations thereof wherein the sterically hindered amine catalyst has the formula R1R2N-[A-NR3]nR4 wherein each of R1, R2, R3, and R4 is independently H, a C1 to C8 alkyl group, a C1 to C8 alkenyl group, a C1 to C8 alcohol group, or a C1 to C8 ether group, or R1 and R2 together form a C5 to C7 cyclic alkyl group, a C5 to C7 cyclic alkenyl group, a C5 to C7 heterocyclic alkyl group, or a C5 to C7 heterocyclic alkenyl group;
- A is a C1 to C5 alkyl group, a C1 to C5 alkenyl group, or an ether;
- n is 0, 1, 2, or 3;
- with the proviso that the sterically hindered amine catalyst has a sum of Charton's steric parameters of about 1.65 or greater.
Dependencies are inferred from the claim text.