Acid catalyzed copolymerization of water and epoxy resin and uses thereof
AssigneeAir Products and Chemicals, Inc.
InventorsFrederick Herbert Walker, John Bartram Dickenson
Life of this patent
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Abstract
Non-gelled polymeric polyols are prepared by the acid catalyzed copolymerization of epoxy resins and water. When the starting resin is an epoxy resin derived from bisphenol-A, the resulting product has much lower levels of bisphenol-A and diglycidyl ether of bisphenol-A (DGEBA) compared to traditional epoxy resins of comparable molecular weight prepared by the advancement process. The product can be cured with OH reactive crosslinkers such as amino resins and polyisocyanates to yield thermosetting coatings with useful properties.
Claims33
A method for preparing a polymeric polyol which comprises copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, wherein the epoxide resin comprises at least one epoxide resin selected from the group consisting of diglycidyl ether of bisphenol-A, an advanced diglycidyl ether of bisphenol-A, diglycidyl ether of bisphenol-F, an epoxy novolac resin, and diglycidyl ether of resorcinol, the amount of water being sufficient to avoid gelation, the copolymerization being a non-dispersion process and performed in the presence of a solvent that substantially dissolves both the epoxide resin and the water.
A method for preparing a polymeric polyol which comprises copolymerizing at least one multifunctional epoxide resin which is a diglycidyl ether of bisphenol-A, an advanced diglycidyl ether of bisphenol-A, a diglycidyl ether of bisphenol-F, diglycidyl ether of resorcinol, or an epoxy novolac resin, and water in a water miscible ether and in the presence of an amount of a superacid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation.
A method for preparing a polymeric polyol which comprises copolymerizing a diglycidyl ether of bisphenol-A and water in the presence of a water miscible ether and in the presence of an amount of a superacid effective for polymerizing the epoxide resin and the water, the minimum amount of water being 5 to 8 g per 100 g diglycidyl ether of bisphenol-A.
A polymeric polyol comprising glycol end groups and a repeat unit structure which contains two glycidyl units and primary and/or secondary alcohols and having a Mn of at least about 750.
A polyol composition comprising a polymeric polyol having an Mn of at least about 750 prepared from a diglycidyl ether of a dihydric phenol or diol in which the level of residual dihydric phenol or diol in the polyol is less than 20 ppm and the level of residual diglycidyl ether of dihydric phenol or diol is less than 500 ppm.
Dependencies are inferred from the claim text.