Metal acetylacetonate latent accelerators for an epoxy-styrene resin system
US4254351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | May 10, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31529
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An epoxy-styrene, solventless resin impregnating varnish, having an atmospheric catalyzed pot life at room temperature of at least 45 days, is made by mixing: (1) the product of the reaction of (a) 1 part of an epoxy resin mixture, comprising solid epoxy resin and liquid epoxy resin wherein the weight ratio of solid epoxy: liquid epoxy is between 1:1 to 1:10; with (b) between about 0.01 part to 0.06 part of maleic anhydride and (c) a catalyst; under such conditions that the epoxy diester formed has an acid number of between about 0.5 to 3.0; with (2) a coreactive vinyl monomer; and between about 0.0003 part to 0.004 part of a room temperature stabilizer (3) between about 0.3 part to 1.2 part of a polycarboxylic anhydride, which is soluble in the mixture of (1) and (2) and an amount of free radical catalyst that is effective to provide a catalytic effect on the impregnating varnish and to cure it at temperatures of over about 85.degree. C., and with (4) between 0.0005 part to 0.005 part of a metal acetylacetonate, selected from the group consisting of chromium (III) acetylacetonate, manganese (III) acetylacetonate, ferric (iron III) acetylacetonate, zinc (II) acetylacetonate, alumin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.