Coating processes – Optical element produced
Patent
1990-12-18
1992-03-10
Bell, Janyce
Coating processes
Optical element produced
427165, 4273881, 4273897, 427404, 4274072, B05D 506
Patent
active
050948814
ABSTRACT:
A lead-free 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, metal or acid salts of dicyandiamide, hydrogen cyanamide, and 2-cyanoacetamide. 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 resin, 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 aforementioned corrosion inhibitor 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 aforementioned 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 resin system containing the novel corrosion inhibitor of the present invention.
REFERENCES:
patent: 2103538 (1937-12-01), Kolb
patent: 2523626 (1950-09-01), Jones
patent: 2856818 (1958-10-01), Woodberry
patent: 3909200 (1975-09-01), Redmore
patent: 3932296 (1976-01-01), Byth
patent: 4253866 (1981-03-01), Aonuma et al.
patent: 4581422 (1986-04-01), Speranza et al.
patent: 4645714 (1987-02-01), Roche et al.
patent: 4666264 (1987-05-01), Yamabe
patent: 4670021 (1987-06-01), Nelson et al.
patent: 4707405 (1987-11-01), Evans et al.
patent: 4745003 (1988-05-01), Sirkoch et al.
patent: 4758638 (1988-07-01), Hickner et al.
patent: 4780372 (1988-10-01), Tracy et al.
patent: 4873139 (1989-10-01), Kinoski
patent: 4880668 (1989-11-01), Hayes et al.
Aero Dicyandiamide, published by Cyanamid Canada, Inc.
In Preparation, published by SKW Trostberg AG.
Cesnik Charles L.
Sanford Timothy J.
Soltys Joseph
Bell Janyce
Lilly Industrial Coatings, Inc.
LandOfFree
Mirrorback coating does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mirrorback coating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mirrorback coating will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2283713