Translucent high-temperature powder coatings
AssigneeRohm and Haas Company
InventorsOwen H. Decker, Charles P. Tarnoski, Lee F. Spencer, Roy M. Berstler, James G. Fotiou
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Abstract
Coating powders are provided which provide high-temperature, translucent coatings useful for light-emitting devices such as incandescent bulbs. The coating powders comprise a binder, at least 90 wt % up to 100 wt % of which is a silicone resin. The coating powders are filled with between about 10 and about 50 phr of fillers selected from the group consisting of needle-like calcium metasilicate, mica, rod-like glass particles, and mixtures thereof, the fillers having aspect ratios between about 8 and about 40.
Claims14
A coating powder composition for providing a translucent coating to a substrate, said coating powder composition comprising,
- a binder resin system, between about 90 and 100 wt % of said binder resin system comprising silicone resin, the balance being silicone cross-linking agents and/or silicone-compatible additives,
- between about 10 and about 50 parts per hundred resin by weight of filler selected from the group consisting of mica, needle-like calcium metasilicate, rod-like glass particles, and mixtures thereof, said filler having aspect ratios between about 8 and about 40, and up to about 3 wt % of a silicone cure catalyst.
A coating powder composition comprising,
- a binder resin system, between about 90 and 100 wt % of said binder resin system comprising silicone resin, the balance being silicone cross-linking agents and/or silicone-compatible additives, and
- between about 0.05 and about 3 wt % of a silicone cure catalyst which is a zinc dialkylcarboxylate.
A light emitting device having a coating formed from a coating powder of a composition comprising
- a binder resin system, between about 90 and 100 wt % of said binder resin system comprising silicone resin, the balance being silicone cross-linking agents and/or silicone-compatible additives,
- between about 10 and about 50 parts per hundred resin by weight of filler selected from the group consisting of mica, needle-like calcium metasilicate, rod-like glass particles, and mixtures thereof, said filler having aspect ratios between about 8 and about 40, and
- up to about 3 wt % of a silicone cure catalyst.
Dependencies are inferred from the claim text.