Stock material or miscellaneous articles – Composite – Of epoxy ether
Patent
1986-07-08
1988-04-19
Lieberman, Allan M.
Stock material or miscellaneous articles
Composite
Of epoxy ether
427 541, 428417, 428418, 522 25, 522169, 522170, 528116, 528354, B05D 302, B05D 306, B32B 2716, B32B 2738
Patent
active
047388994
ABSTRACT:
A process for preparing an adhesive, transparent, corrosion and abrasion resistant polymeric coating on a substrate, such as a glass, plastic or metal such as aluminum or steel. The substrate is coated with a mixture of up to about 15% by weight of an expanding polycyclic monomer such as a spiroorthocarbonate or spiroorthoester, a diepoxy oligomer such as a diglycidyl ether, and a lactone in a concentration of from about 1:2.5 to 1:4.5 by weight of the oligomer. To this mixture is added a catalytic quantity of a boron trihalide-amine complex and a catalytic quantity of an aromatic photocatalyst which releases a carbonium ion upon ultraviolet irradiation. The coated substrate is exposed to broad wavelength UV light for from about 2 to 20 seconds to initiate polymerization. Polymerization of the coating is completed by heating the coated substrate at a temperature of from about 50.degree. to 120.degree. C. for a sufficient period to complete polymerization to a flexible, tough, abrasive and corrosion resistant transparent coating. If the substrate is very thin, the heating may be omitted, as determined by the artisan. Instead of heating to complete polymerization, a di- or tri- functional acrylate may be added to the initial mixture. Preferably, the expanding monomer is a spiroorthoester formed in situ by the reaction of a lactone such as .gamma.-butyrolactone with an epoxide, as known in the art.
REFERENCES:
patent: 4250203 (1981-02-01), Schlesinger et al.
patent: 4368314 (1983-01-01), Endo et al.
patent: 4378279 (1983-03-01), Smith
patent: 4387215 (1983-06-01), Bailey
patent: 4593051 (1986-06-01), Koleske
patent: 4599155 (1986-07-01), Suzuki et al.
Bluestein Claire
Cohen Murray S.
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