Light-screening film paint for lamps, and light-screening film f

Details Light-screening film paint for lamps, and light-screening film f Light-screening film paint for lamps, and light-screening film f

1998-09-10

2000-01-18

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Heating or drying

427162, 427165, 427350, 4273977, B05D 302, B05D 300

Patent

active

060155922

ABSTRACT:
When in use a highly luminous automobile discharge lamp will experience a temperature rise to about 700.degree. C. at the lamp glass surface. As such, the light-screening film formed on the lamp will also be exposed to a temperature of 700.degree. C.; the temperature of the glass surface of a lamp rises and, accordingly, that of the light-screening film formed thereon also rises. Especially with a highly luminous automobile discharge lamp, the temperature of the lamp glass surface rises to about 700.degree. C. during the lighting. Necessarily, the light-screening film on the glass surface is also exposed to a temperature of 700.degree. C. As such, a light-screening film material free of discoloration or peeling even after exposure to a temperature of 700.degree. C. has been desired. There is disclosed a light-screening film paint for lamps containing (1) at least one compound of either manganese oxide or an iron oxide compound doped with a metallic manganese and having the formula (Fe.sub.x Mn.sub.1-x).sub.2 O.sub.3 where 0.95>x>0.70; and (2) powder glass containing at least one of silica, zinc oxide, boron oxide and aluminum oxide. A light-screening film is produced by applying the paint to the surface of a lamp, followed by the firing at a temperature of not higher than 1,200.degree. C.

REFERENCES:
patent: 3023338 (1962-02-01), Cerulli
patent: 4076489 (1978-02-01), Schroeter et al.
patent: 4099080 (1978-07-01), Dawson et al.
patent: 4391847 (1983-07-01), Brown
patent: 4576922 (1986-03-01), O'Brien et al.
patent: 5168126 (1992-12-01), Matsumoto et al.
patent: 5410212 (1995-04-01), Reisman
patent: 5619102 (1997-04-01), Scholler

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