Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1984-01-23
1985-01-08
Robinson, Ellis P.
Stock material or miscellaneous articles
Composite
Of polycarbonate
427 39, 427 40, 427 41, 427387, 428447, 428450, 4284744, 428480, 428522, B32B 2712, B32B 2730
Patent
active
044927339
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved scratch or abrasion resistant coating for a solid substrate and more particularly to such coatings for transparent plastic substrates. The invention also includes a method for providing an improved abrasion resistant coating which comprises coating the substrate with an organosilanol coating liquid, curing the coating, and then subjecting the coated substrate to a glow discharge by placing it preferably in the positive column region thereof.
This invention also relates to a mirrored solid substrate comprising a layer of a glow discharge treated organosiloxane coating and a mirror layer vapor-deposited on said organosiloxane coating layer.
BACKGROUND ART
There are a large number of references relating to the preparation of an abrasion-resistant coating on a solid substrate such as a plastic material. In light of the various advantages of plastic materials such as light weight, low material cost and ease of shaping, the development of abrasion-resistant coatings for plastic materials is highly significant from a commercial standpoint. Included among those methods commonly used for such a purpose are a group of methods where a liquid coating composition is applied to a solid substrate and another group of methods where a coating layer is prepared by use of a plasma polymerization of a monomer onto the surface of a solid substrate. Various liquid coating compositions suitable for the first group of methods and various monomers suitable for plasma polymerization have been disclosed in the past. There also exist references relating to the post-treatment of a coated layer which improves or modifies the surface properties thereof.
Burzynski et al, U.S. Pat. No. 3,451,838 describes a process of coating plastics with an organosiloxane. It discloses that abrasion resistant organpolysiloxane compounds can be prepared by the hydrolysis and condensation of at least one compound embraced by the general formula T.sub.n Si Z.sub.4-n where each T is independently a hydrocarbon radical such as alkyl, alkenyl and aryl and each Z is independently a hydrolyzable group such as halogen, acyloxy and aryloxy.
Krekeler, U.S. Pat. No. 3,713,880 describes a process for coating the surface of transparent thermoplastic resins with a solution of a mixture of alkyl silicate, or organosilane and an antistatic additive and thereafter subjecting the coated material to a heat treatment, said organosilane being a compound of the formula R Si X.sub.3, R.sub.2 Si X.sub.2 or a mixture thereof, where R is a hydrocarbon radical and X is a hydrolyzable group, namely, a halogen or a lower alkoxy group.
Gagnon, U.S. Pat. No. 3,650,808 describes a process for providing an abrasion resistant coating on a polycarbonate surface which comprises priming the polycarbonate surface with a compound of the formula H.sub.2 NR.sub.1 Si(OR).sub.3 where R.sub.1 is an alkylene group, and OR is an alkoxy group of 1-4 carbon atoms, and thereafter applying to the surface a coating liquid which is produced by heating methyltrialkoxysilane or a mixture of methyltrialkoxysilane and phenyltrialkoxysilane followed by a partial condensation thereof.
Clark, U.S. Pat. No. 3,986,997 discloses a pigment-free aqueous coating composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH).sub.3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH.sub.3 Si(OH).sub.3.
French, U.S. Pat. No. 3,953,115 describes a process for applying an adherent, optically clear, abrasion resistant coating to plastic ophthalmic substrates which comprises (a) forming a partially hydrolyzed solution of a vinyltri(loweralkoxy)silane in a water-miscible volatile organic solvent, the silane concentration being 25-75% by weight, (b) applying a thi
REFERENCES:
patent: 2778793 (1957-01-01), Thomas et al.
patent: 3451838 (1969-06-01), Burzynski et al.
patent: 3632386 (1972-01-01), Hurst
patent: 3650808 (1972-03-01), Gagnon
patent: 3669720 (1972-06-01), Remer
patent: 3686018 (1972-08-01), Lindblom et al.
patent: 3713880 (1973-01-01), Krekeler et al.
patent: 3843399 (1974-10-01), Kaplan et al.
patent: 3901994 (1975-08-01), Mehalso et al.
patent: 3953115 (1976-04-01), French et al.
patent: 3986997 (1976-10-01), Clark
patent: 4018945 (1977-04-01), Mehalso
patent: 4072985 (1978-02-01), Kaganowicz et al.
patent: 4096315 (1978-06-01), Kubacki
patent: 4123308 (1978-10-01), Nowlin et al.
patent: 4137365 (1979-01-01), Wydeven et al.
patent: 4225631 (1980-09-01), Berger et al.
patent: 4277287 (1981-07-01), Frye
patent: 4298655 (1981-11-01), Kray
"Thin Film Processes", Vossen and Kern, Editors, Academic Press, New York, (1978), Chapter IV, pp. 378 and 379.
Haddad Theodore A.
Phillips Richard A.
Crall Hugh C.
Foster Grant Corporation
Ikeda Tatsuya
Robinson Ellis P.
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