Curable composition, varnish and laminate
AssigneeZeon Corporation
InventorsYasuhiro Wakizaka, Toshiyasu Matsui, Daisuke Uchida, Koichi Ikeda
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Abstract
A curable composition comprises an insulating resin and a halogen-free flame retardant. The halogen-free flame retardant has a particulate form, and whose primary particles have an average major axis from 0.01 to 5 μm, an aspect ratio of 5 or less, and the proportion of a major axis of more than 10 μm being at most 10% by number. A varnish comprises an insulating resin, a curing agent, a flame retardant and an organic solvent. The flame retardant is a flame retardant in particulate form surface-treated with a coupling agent, and the flame retardant particles present in the varnish have a secondary particle diameter of 30 μm or less.
Claims9
A varnish comprising:
- an insulating resin, a curing agent, a halogen-free flame retardant, and an organic solvent;
- wherein:
- (a) the halogen-free flame retardant is a particulate material, present as both primary particles and secondary aggregation particles, surface-treated with a metal chelate coupling agent;
- (b) the primary particles feature an average major axis length of from 0.01 to 5 μm;
- (c) the secondary aggregation particles feature a diameter of 30 μm or less;
- and (d) the curing agent comprises a nitrogen-containing compound and a peroxide curing aid.
Dependencies are inferred from the claim text.