Graft polymer compositions of terminated epoxy resin, processes for making and using same, and substrates coated therewith
US4308185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1979 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31529
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Epoxy resin is reacted with a terminating agent to eliminate at least part of the epoxide groups of the resin and form modified resin. The epoxy resin or such modified resin is also reacted with addition polymerizable monomer at elevated temperature in the presence of at least 3% of benzoyl peroxide based on the weight of such monomer. Generally the latter reaction is done at about 110.degree. C. to about 120.degree. C. These two reactions can be performed in any desired sequence, or simultaneously. The final reaction mixture produced contains: PA1 (a) graft polymer; PA1 (b) ungrafted, modified resin; and PA1 (c) ungrafted addition polymer, formed associatively with the graft polymer. The invention is useful for making coating compositions. The compositions have good weather resistance and are particularly useful for making sanitary coatings for cans for foods and beverages, especially for beer. The coatings compositions can be aqueous dispersions for spray application or concentrates or powders that can be made up readily into aqueous sprayable coating compositions. Organic solvent vehicles also can be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.