Polyisocyanurates from diols modified with epoxy resins
AssigneeTexaco Inc.
InventorsGeorge P. Speranza, Robert L. Zimmerman
Life of this patent
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Abstract
A method of preparing polyether polyols in the 200-1000 molecular weight range by modifying a polyol initiator with an epoxy resin and one or more alkylene oxides is described. The modified polyols may be used in preparing rigid isocyanurate foams with improved compressability and flammability properties.
Claims22
A modified polyether polyol being produced by a method comprising the following steps
- (a) mixing a low molecular weight polyol initiator having a hydroxyl functionality of less than three with an epoxy resin,
- (b) heating the mixture in (a) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (c) adding to the heated mixture one or more alkylene oxides.
A modified polyether polyol having a molecular weight in the range of about 200 to 1,000 and being produced by a method comprising the following steps
- (a) mixing a low molecular weight polyol initiator having a hydroxyl functionality of two with an epoxy resin selected from the group of epoxy resins consisting of the diglycidyl ether of Bisphenol A, epoxy novolak resins and aliphatic epoxy resins,
- (b) heating the mixture in (a) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (c) adding to the heated mixture one or more alkylene oxides.
A method of preparing a modified polyether polyol comprising the following steps
- (a) mixing a low molecular weight polyol initiator having a hydroxyl functionality of less than three with an epoxy resin,
- (b) heating the mixture in (a) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (c) adding to the heated mixture one or more alkylene oxides.
A method of preparing a modified polyether polyol comprising the following steps
- (a) mixing a low molecular weight polyol initiator having a hydroxyl functionality of two with an epoxy resin selected from the group of epoxy resins consisting of the diglycidyl ether of Bisphenol A, epoxy novolak resins, and aliphatic epoxy resins,
- (b) heating the mixture in (a) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (c) adding to the heated mixture one or more alkylene oxides.
An improved rigid polyisocyanurate foam produced by the reaction of a modified polyol, an organic polyisocyanate and a foam catalyst wherein the improvement comprises making the modified polyol by a method comprising the following steps
- (a) mixing a low molecular weight polyol initiator having a hydroxyl functionality of less than three with an epoxy resin,
- (b) heating the mixture in (a) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (c) adding to the heated mixture one or more alkylene oxides.
A method for producing an improved rigid polyisocyanurate foam which comprises
- (a) making a modified polyol by a method comprising the following steps
- (1) mixing a low molecular weight polyol initiator having a hydroxyl functionality of less than three with an epoxy resin,
- (2) heating the mixture in (1) to a temperature between about 70.degree. C. to 115.degree. C. for a period of time and
- (3) adding to the heated mixture one or more alkylene oxides, and
- (b) reacting said modified polyol with an organic polyisocyanate and one or more suitable foam catalysts.
Dependencies are inferred from the claim text.