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US 5,489,630 AGranted
Self-emulsifying epoxy curing agent
AssigneeAir Products and Chemicals, Inc.
InventorFrederick H. Walker
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AssigneeAir Products and Chemicals, Inc.
InventorFrederick H. Walker
Estimating the term…
A new epoxy hardener composition is the product of the reaction of (A) a poly(alkylene oxide) monoamine or diamine with a molecular weight (Mn) of about 500 to 3000 and (B) a di- or polyepoxide, in a ratio of epoxide to active amine hydrogens of about 1.1:1 to 6:1 to yield an intermediate (C), which in a second step is reacted with (D) a di- or polyamine, in a ratio of active amine hydrogens to epoxide of greater than about 25 to 1, preferably greater than about 30 to 1. The compositions of the invention are excellent emulsifiers of liquid epoxy resins in aqueous medium without the addition of added surfactants or acidic compounds, and can be used to prepare water resistant water-borne coatings and related products from both liquid and solid epoxy resins, that possess long pot lives and contain relatively small amounts of volatile organic compounds.
An epoxy hardener composition comprising the reaction product of (A) a poly(alkylene oxide) mono- or diamine having a number average molecular weight (Mn) of 500 to 3000 and (B) a polyepoxide in a ratio of epoxide groups to active amine hydrogen atoms of about 1.1:1 to 6:1 to yield an intermediate (C) which is reacted with (D) a polyamine in a ratio of active amine hydrogen atoms to epoxide groups of >25:1, the amount of the poly(alkylene oxide) monoamine or diamine used to produce intermediate (C) being sufficient to provide a stable solution or emulsion of the epoxy hardener composition in an aqueous medium.
An epoxy hardener composition comprising the reaction product of (A) a poly(alkylene oxide) mono- or diamine having a number average molecular weight (Mn) of 500 to 3000 and (B) a polyepoxide in a ratio of epoxide groups to active amine hydrogen atoms of about 1.3:1 to 6:1 to yield an intermediate (C) which is reacted with (D) a polyamine in a ratio of active amine hydrogen atoms to epoxide groups of >30:1, the amount of the poly(alkylene oxide) monoamine or diamine used to produce intermediate (C) being 15 to 40 wt. % of the epoxy hardener composition.
An epoxy hardener composition comprising the reaction product of (A) a poly(alkylene oxide) monoamine having a number average molecular weight (Mn) of 800 to 1500 and (B) a polyepoxide in a ratio of epoxide groups to active amine hydrogen atoms of about 1.5:1 to 2.5:1 to yield an intermediate (C) which is reacted with (D) a polyamine in a ratio of active amine hydrogen atoms to epoxide groups of >30:1, the amount of the poly(alkylene oxide) monoamine used to produce intermediate (C) being 8 to 30 wt. % of the epoxy hardener composition.
Dependencies are inferred from the claim text.