Method for producing electrical circuitry on filled organic polymers
Electrical circuitry is produced on the surface of an organic polymer. The electrical circuitry is produced on a support, and a polymerizable composition is brought into contact with the support and the circuitry. The polymerizable composition is polymerized while in contact with support and the circuitry to produce a solid, organic polymer. The electrical circuitry becomes adhered to and partially embedded in a surface of the solid organic polymer. The support may be removed subsequent to the polymerization step to expose the circuitry at the surface of the solid organic polymer.
1 . A method for continuous production of an electrical circuit on a filled polymeric material, comprising the steps of:
a) continuously introducing onto a traveling support a support comprising an electrical circuit and a polymerizable composition,
wherein the polymerizable composition on the traveling support has a first surface in contact with the traveling support, and a second exposed surface; and
wherein the electrical circuit is in contact with either the first or second surface of the polymerizable composition, and
wherein the polymerizable composition comprises
(i) one or more polymerizable materials including methyl methacrylate and
(ii) at least one particulate filler comprising alumina trihydrate; and then
b) continuously polymerizing the polymerizable materials of the polymerizable composition while the polymerizable composition is in contact with the electrical circuit to continuously produce the electrical circuit on the filled polymeric material comprising a polymer of methyl methacrylate,
wherein the electrical circuit is adhered onto and at least partially embedded into the filled polymeric material.
2 . The method of claim 1 , further comprising, after step b), a step of
c) removing the support from the electrical circuit to expose the electrical circuit.
3 . The method of claim 1 wherein the at least one particulate filler constitutes 55 to 95 percent by weight of the polymerizable composition.
4 . The method of claim 1
wherein the filled polymeric material has a Vicat softening temperature (ISO 306, test condition B/50N) of at least 75° C., a volume resistivity of at least 1×10 10 Ohm/cm, and a Rockwell M scale hardness of at least 80.
5 . The method of claim 1 wherein the at least one particulate filler further includes polymeric decorative particles and the polymeric decorative particles constitute 1 to 25 percent of the total weight of the filled polymeric material.
6 . The method of claim 1 wherein the support of the support comprising the electrical circuit is an organic polymer transfer sheet.
7 . The method of claim 1 wherein the filled polymeric material has a volume resistivity of at least 1×10 12 Ohm/cm when measured according to ATSM D257.
8 . The method of claim 1 , further comprising producing the support comprising the electrical circuit prior to step a).
9 . The method of claim 8 wherein the electrical circuit of the support comprising the electrical circuit is produced by printing.
10 . The method of claim 1 wherein the traveling support is a traveling mold, trough, form, belt, or other supporting apparatus.
11 . The method of claim 1 wherein the support comprising the electrical circuit is continuously fed onto the traveling support and the polymerizable composition is continuously poured or sprayed the onto the traveling support, with the electrical circuit in contact with the first surface of the polymerizable composition.
12 . The method of claim 1 wherein the support comprising the electrical circuit is continuously fed onto the polymerizable composition on the traveling support, with the electrical circuit in contact with the second exposed surface of the polymerizable composition.