Process for preparing rigid polyurethane foams
AssigneeThe Dow Chemical Company
InventorsMichael A. P. Gansow, Omar B. Shadid, Johannes E. G. Spork
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Abstract
This invention is directed to a process by preparing a rigid polyurethane foam which comprise reacting a polyisocyanate with a polyol in the presence of a blowing agent, a polymerization catalyst and a surfactant. The polyol has the formula ##STR1##
Claims10
A process for preparing a rigid polyurethane foam which comprises reacting a polyisocyanate with a polyol in the presence of a blowing agent, a polymerization catalyst and a surfactant, the polyol having the formula:
- ##STR4## wherein R.sup.1, R.sup.2, and R.sup.3 are, each independently, hydrogen, a C.sub.1 -C.sub.6 alkyl group, optionally bearing one or more halogen, hydroxyl, optionally substituted phenyl, optionally substituted cycloalkyl, or optionally substituted phenyl ether substituents, n is 1 or 2, and x+y+z is from about 3.5 to about 5.7.
A precursor composition for use in the preparation of a rigid polyurethane foam, which composition comprises a polyol of the formula:
- ##STR5## wherein R.sup.1, R.sup.2, and R.sup.3 are, each independently, hydrogen, a C.sub.1 -C.sub.6 alkyl group, bearing one or more halogen, hydroxyl, optionally substituted phenyl, optionally substituted cycloalkyl, or optionally substituted phenyl ether substituents, n is 1 or 2, and x+y+z is from about 3.5 to about 5.7, together with at least one rigid polyurethane foam ingredient, selected from the group consisting of:
- (i) an additional polyol component,
- (ii) a blowing agent,
- (iii) a surfactant,
- (iv) a fire retardant, and
- (v) a polyisocyanate.
Dependencies are inferred from the claim text.