Electrostatic deposition of fine vitreous enamel

Details Electrostatic deposition of fine vitreous enamel Electrostatic deposition of fine vitreous enamel

1975-03-14

1978-04-04

Pianalto, Bernard D.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427193, 427337, 427375, B05B 502

Patent

active

040828603

ABSTRACT:
The invention provides a powder of fine semiconducting vitreous enamelling particles, such as alkali-boro silicate glass frit, especially applicable to an electrostatic powder coating process, for providing improved electrostatic adhesion to a base metallic surface. The preferred powder treatment is to expose the dried powder to tri-chloro-silane vapor which reacts with the hydroxyl surface groups on the particles to form a surface layer which is then exposed to water vapor producing a hydrophobic cross-linked silicone structure. In the final firing stage of the enamelling process excess organic groups are driven off, and the enamel is not contaminated.

REFERENCES:
patent: 3632434 (1972-01-01), Hutson
patent: 3669693 (1972-06-01), Dalton et al.
patent: 3819367 (1974-06-01), Chatterji et al.
patent: 3833366 (1974-09-01), Madrid
patent: 3840464 (1974-10-01), Van Engeland et al.

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