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US 4,518,720 AGranted
Flexible polyurethane foams made from polyether polyols modified with epoxy resin-diamine adducts
AssigneeTexaco Inc.
InventorsMichael Cuscurida, Harold G. Waddill, Bruce W. Peterson
Life of this patent
Estimating the term…
Abstract
Flexible polyurethane foams having improved properties and made from modified polyether polyols are described. The polyether polyols are modified with adducts of epoxy resins, such as the diglycidyl ether of Bisphenol A, and diamines, such a polyoxypropylenediamine. The resulting modified polyether polyols have a molecular weight of from about 2,000 to 7,000. The mole ratio of epoxy equivalents to amine equivalents in the adduct ranges from about 2/1 to 10/1.
Claims13
Flexible polyurethane foam being produced by the process comprising
- reacting a modified polyether polyol together with an organic polyisocyanate in the presence of a polyurethane catalyst and a blowing agent, wherein the modified polyether polyol is produced by the process comprising adding an epoxy resin-diamine adduct to a polyether polyol during the reaction of an alkylene oxide with a polyol initiator where the mole ratio of epoxy equivalents to amine equivalents in the epoxy resin-diamine adduct is in the range of about 2/1 to about 10/1.
A method for producing a flexible polyurethane foam comprising
- a. reacting an epoxy resin with a diamine such that the mole ratio of epoxy equivalents to amine equivalents is in the range of about 2/1 to about 10/1, to form an epoxy resin-diamine adduct,
- b. reacting the epoxy resin-diamine adduct from step a. with a reaction mixture of a polyol initiator with an alkylene oxide to form a modified polyether polyol, and
- c. reacting the modified polyether polyol from step b. with an organic polyisocyanate in the presence of a polyurethane catalyst and a blowing agent.
Dependencies are inferred from the claim text.