Method for forming a protective coating film on electronic parts

Coating processes – Electrical product produced

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427379, 427387, 428 1, B05D 302

Patent

active

056629613

ABSTRACT:
Proposed is a novel method for the formation of a protective coating film having a pencil hardness of up to 9 H on the surface of various substrates or, in particular, electronic parts such as color filters and liquid crystal display panels. The method comprises: coating the surface with a liquid coating composition of which the principal ingredient is a partial cohydrolysis-condensation product of a tetraalkoxy silane, e.g., tetraethoxy silane, and a functional alkoxy silane, e.g., 3-methacryloxypropyl trimethoxy silane, and drying and heating the coating layer to effect complete curing. The hardness of the cured protective film can be increased by admixing the liquid coating composition with a finely divided inorganic filler such as a colloidal silica. It is optional that the functional alkoxy silane is subjected to the cohydrolysis reaction after it is polymerized alone or after it is copolymerized with a polyfunctional acrylic monomer.

REFERENCES:
patent: 4211823 (1980-07-01), Suzuki et al.
patent: 4250240 (1981-02-01), Shimada et al.
patent: 4343857 (1982-08-01), Uram, Jr.
patent: 4405679 (1983-09-01), Fujioka et al.
R. Reisfeld et al., SPIE Proceeding, vol. 1727, pp. 299-305 (May 1992).

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