Self-emulsifying epoxy curing agent
US5489630A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Nov 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G59/184
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.