C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
402/252, 400/514
C08L 63/10 (2006.01) C08F 299/02 (2006.01) C08G 59/22 (2006.01) C08G 59/42 (2006.01) H01B 3/40 (2006.01)
Patent
CA 1089583
ABSTRACT OF THE DISCLOSURE 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 mix- ture, 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°C, and with (4) between 0.0005 part to 0.005 part of a metal acetylacetonate, selected from the group con- sisting of chromium (III) acetylacetonate, manganese (III) acetylacetonate, ferric (iron III) acetylacetonate, zinc (II) acetylacetonate, aluminum (III) acetylacetonate, sodium (I) acetylacetonate, uranyl (VI) acetylacetonate, and mixtures thereof, acting as latent accelerator.
299471
Kauffman Robert N.
Smith James D. B.
Mcconnell And Fox
Westinghouse Electric Corporation
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