Coating processes – Optical element produced – Transparent base
Patent
1990-01-11
1991-12-24
Bell, Janyce
Coating processes
Optical element produced
Transparent base
427162, 427384, 4273881, 4273897, 427404, 4274072, 4274198, B05D 506
Patent
active
050751344
ABSTRACT:
A composition capable of being applied as a film and hardening to form a protective layer on the back of a mirror comprises a fluid organic resin and a corrosion inhibitor selected from the group consisting of dicyandiamide and metal or acid salt thereof. The organic resin may be any thermoplastic or thermosetting resin suitable for coating the reflective and other metallic layers of the mirror. Exemplary resins include alkyd resins, acrylic resins, modified alkyd resins, polyesters, urethane oils, vinyl halide polymers or copolymers, oleoresinous varnishes, nitrocellulose compositions, phenol-formaldehyde resin varnishes, and epoxy resins. Preferably, the resin is an alkyd or modified alkyd resin. The dicyandiamide or metal or acid salt of dicyandiamide may be present in an amount from about 0.1 to 20 weight percent, preferably 0.5 to 10 weight percent, of the organic resin coating system. The resin system should be essentially free of lead and lead salts. To inhibit the corrosion of metallic film layers on mirrors, a mirror having a glass substrate layer and a metallic film layer thereover should be obtained, after which the fluid organic resin coating system containing the dicyandiamide or metal or acid salt of dicyandiamide corrosion inhibitor is applied over the metallic film layer. The organic resin coating system is then hardened to produce the protective coating layer over the metallic layer. Other articles having metallic surfaces may also be protected by the dicyandiamide-containing resin system of the present invention.
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In Preparation, published by SKW Trostberg AG.
Bell Janyce
Lilly Industrial Coatings, Inc.
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