Etherified phosphoric acid ester of epoxy resin
US4801628A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31529
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A non-water dispersible, oxirane-defunctionalized, etherified, phosphoric acid ester of an epoxy resin is useful in enhancing the adhesion of aqueous thermosetting coating compositions useful as a varnish or white coating for drawn and ironed aluminum containers. The epoxy resin ester is prepared by reacting PA1 (a) an epoxy resin having an epoxy equivalent weight of at least about 190; PA1 (b) orthophosphoric acid in an amount of 0.2 to 0.45 equivalents per equivalent of epoxy resin; PA1 (c) at least about 0.65 equivalents, per equivalent of epoxy resin, of a reactive hydroxyl-functional compound having at least one hydroxyl group reactive with an oxirane group of said epoxy resin, said hydroxyl-functional compound being a solvent for said epoxy resin and for the non water-dispersible, defunctionalized, etherified, phsophoric acid epoxy resin ester reaction product; and PA1 (d) water in an amount of 0-20% of the weight of the orthophosphoric acid. By "non water-dispersible" is meant that the resin additive, either with or without being salified with a base, is not dispersible by itself in water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.