Apparatus for applying a composite insulative coating to a subst

Details Apparatus for applying a composite insulative coating to a subst Apparatus for applying a composite insulative coating to a subst

1990-09-21

1992-06-16

Bueker, Richard

Coating apparatus

Gas or vapor deposition

Multizone chamber

118723, C23C 1650

Patent

active

051217066

ABSTRACT:
A process for applying an adherent electrically insulative moisture-resistant composite coating to a substrate. A thin, adherent, highly cross-linked, substantially liquid moisture-impervious primer coating is provided on the substrate by glow discharge polymerization of a low molecular weight hydrocarbon monomer in a low pressure chamber containing the substrate, the monomer being selected from among methane, ethane, propane, ethylene, and propylene. A second polymeric coating layer is provided over the primer coating by glow discharge polymerization of a second precursor comprising a hydrocarbon or substituted hydrocarbon. The precurser exhibits a hydrogen yield of not greater than about 0.75 hydrogen atoms per molecule under the glow discharge polymerization conditions under which the second layer is deposited, whereby the second polymeric coating layer is substantially resilient and strongly bonded to the primer coating and the second layer comprises a high concentration of surface and bulk free radicals. An article produced by the process and an apparatus for carrying out the process are also disclosed.

REFERENCES:
patent: 4072769 (1978-02-01), Lidel
patent: 4366184 (1982-12-01), Auerbach
patent: 4618507 (1986-10-01), Sadhir
patent: 4673589 (1987-06-01), Standley
patent: 4683143 (1987-07-01), Riley
patent: 4692347 (1987-09-01), Yasuda
patent: 4810524 (1989-03-01), Nakayama
Yasuda, Distribution of Polymer Deposition in Plasma Polymerization, II. Effect of Reactor Design. Journal of Polymer Science: Polymer Chemistry Edition, vol. 16, (1978) pp. 313-326.

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