Resin rich polybutadiene-mica flexible high voltage insulation
AssigneeWestinghouse Electric Corp.
InventorJames D. B. Smith
Life of this patent
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Abstract
A resinous composition useful for impregnating flexible electrical winding tape is made by mixing: (a) 100 parts of polybutadiene, (b) about 0.25 part to about 25 parts of a solid, organic, aromatic, vinyl monomer coreactive with polybutadiene, (c) a solvent for the polybutadiene and (d) an effective amount of organic reaction catalyst.
Claims7
A void free high voltage capability electrical pre-preg winding insulation tape, comprising mica, and a contacting polymerizable resinous composition consisting essentially of a homogeneous, substantially unreacted mixture of polybutadiene consisting of from about 20 weight percent to about 98 weight percent of 1,2-polybutadiene and from about 2 weight percent to about 80 weight percent of 1,4-polybutadiene;
- about 0.25 part to about 25 parts per 100 parts of total polybutadiene of a solid vinyl monomer coreactive with polybutadiene selected from the group consisting of vinyl carbazole, 1-vinyl naphthalene, 2-vinyl naphthalene, vinyl anthracene, N-vinyl phthalimide and mixtures thereof;
- up to about 5 weight percent of solvent for the polybutadiene and an amount of an organic reaction catalyst effective to cure the resinous mixture, at resin composition temperatures of at least about 130.degree. C., said pre-preg being dry and highly flexible, having a shelf life of at least 6 months.
Dependencies are inferred from the claim text.