Patent ID: 7531204

Claim:
A process for making a light-activatable polymer composite, consisting essentially of the steps of: A. dispersing a spinel crystal filler in an organic solvent, wherein the average particle size of the spinel crystal filler is from 50 to 10000 nanometers to form a dispersion, B. combining the dispersion with a polymer binder selected from the group consisting of epoxy resins, silica filled epoxy, bismaleimide resins, bismaleimide triazines, fluoropolymers, liquid crystal polymers, cyanate esters, or combinations thereof, to form a composition, C. applying the composition onto a portion of a flat surface to form a layer, and D. applying thermal energy to the layer to form a polymer composite, the polymer composite consisting of above 15 weight percent up to 50 weight percent spinel crystal filler, 45 to 85 weight percent polymer binder and up to 10 weight percent of an optional ingredient, wherein the spinel crystal filler is represented by a chemical formula AB 2 O 4 or BABO 4 , where A is a metal cation having a valence of 2 selected from a group consisting of manganese, copper, and combinations of two or more of these, and where B is a metal cation having a valence of 3 selected from a group consisting of manganese, iron, chromium, and combinations of two or more of these.