Method to apply a protective layer to the surface of optical ref

Details Method to apply a protective layer to the surface of optical ref Method to apply a protective layer to the surface of optical ref

1976-08-20

1978-04-18

Newsome, John H.

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Web or sheet containing structurally defined element or...

Physical dimension specified

427 35, 427296, 427 38, 427404, 427407C, 428448, 428450, 428462, B05D 306

Patent

active

040852482

ABSTRACT:
The reflectors, for example for automotive vehicle head lamps are reflectorized by evaporating aluminum thereon in a vacuum vessel at a vacuum of about 10.sup.-7 bar; thereafter, and without removing the reflectors, a gaseous monomer is introduced raising the pressure to about 5 .times. 10.sup.-6 bar to deposit a protective layer by polymerization from the gaseous phase. The monomer gases, preferably, are low molecular weight siloxanes having methyl-, vinyl- or phenyl groups, preferably hexamethyldisiloxane (HMDS), or methyl-, vinyl- or alkoxy silanes, preferably vinyltrimethylsilane (VTMS), polymerization being accelerated and ensured by an electrical discharge generated within the vessel by a heated electron emitter placed at a negative voltage with respect to the reflector blanks. After polymerization, the layer is rendered hydrophilic by treatment with oxygen at a pressure of about 10.sup.-2 to 10.sup.-3 m bar to form an organosilicon polymeric protective layer which is inherently hydrophobic and has a hydrophilic surface.

REFERENCES:
patent: 3057792 (1962-10-01), Frohlich
patent: 3068510 (1962-12-01), Coleman
patent: 3201271 (1965-08-01), Simmons et al.
patent: 3968270 (1976-07-01), Hasegawa
Tkachuk, I, Chem. Abstr., 66,29209 (1967).
Tkachuk, II, Chem. Abstr., 68,70238 (1968).
Smolinsky, Chem. Abstr., 71, 129827 (1969).

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