Polyols useful for preparing water blown rigid polyurethane foam
AssigneeThe Dow Chemical Company
InventorsNelson F. Molina, Stanley E. Moore
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Abstract
Mannich polyols having a viscosity of from 300 to 3,500 cps (0.3 to 3.5 Pa*s) at 25° C. are prepared by admixing a phenol, an alkanolamines, and formaldehyde mixed in molar ratios of from 1:1:1 to 1:2.2:2.2 resulting in an initiator which can be alkoxylated using a mixture of ethylene oxide and propylene oxide to prepare polyols that have a nominal functionality of from 3 to 5.4.
Claims14
A process for preparing a Mannich polyol having a viscosity of from 300 to 3,500 cps (0.3 to 3.5 Pa*s) at 25° comprising the steps of admixing a phenol, an alkanolamine, and formaldehyde at a molar ratio of 1:1:1 to 1:2.2:2.2 to prepare a Mannich base and then alkoxylating the Mannich base with an admixture of ethylene oxide and propylene oxide under reaction conditions sufficient to prepare a Mannich polyol wherein the minimum amount of alkylene oxide used is 0.3 moles per hydroxyl group in the Mannich base, about 5 to 55 percent of the weight of the ethylene oxide and propylene oxide is ethylene oxide and the Mannich polyol has an OH number of from 250 to 350.
A Mannich polyol having a viscosity of from 300 to 3,500 cps (o.3 to 3.5 Pa*s) at 25° C. and an OH number of about 250 to 500.
Dependencies are inferred from the claim text.