Fillers for improved epoxy laminates
AssigneeIsola Laminate Systems Corp.
InventorsAroon Vishwanath Tungare, Scott Harold Richgels, Jeffrey Robert Kamla, Peggy Mae Conn
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Abstract
Epoxy laminates incorporate up to 20 wt. % talc particles, particularly pure Montana platy talc particles having a maximum particle size of about 40 μm providing improved drilling performance, reduced dust formation, and improved Z-direction CTE, particularly when the epoxy resin has a Tg of about 150° C. or higher. The talc is selected from those which do not significantly reduce the electrical strength of the laminate relative to those which contain no talc particles. Characteristically, the talcs will have less than 5 wt. % impurities and less than 0.01 wt. % (100 wt.ppm) water extractable anions.
Claims8
A method of reducing dusting in epoxy resin based laminates during processing of said laminates comprising incorporating in said epoxy resin more than 0 and up to about 20 wt % of talc particles wherein the talc particles have less than about 0.01 wt % water extractable anions and wherein the talc particles are not burnt talc particles.
Dependencies are inferred from the claim text.