Low-cost, user-friendly hardcoating solution, process and coating

a hardcoating solution and low-cost technology, applied in the field of low-cost, user-friendly hardcoating solutions, process and coating, can solve the problems of poor film formation, poor abrasion resistance of coatings, and high water-content clark coatings applied, dried and cured in ordinary conditions, and achieves improved abrasion resistance of many types of articles, improved abrasion resistance, and reduced volatility
US20010024719A1Inactive Publication Date: 2001-09-27LEWIS WILLIAM
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
LEWIS WILLIAM
Publication Date
2001-09-27
Estimated Expiration
Not applicable · inactive patent
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Abstract

An improved, user-friendly silane / silica sol copolymer hardcoating composition for protecting optical plastic and other substrates (including wood, metals, glass, plastics and most coated articles) from scratching is able to be manufactured at lower costs and to provide much-improved ease of use in transportation, storage, dipbath (or other coating tank) stability, and blush resistance in ordinary cleanroom atmospheres. The silane / silica sol copolymer is formed as a direct reaction product of an acidic silica sol and monomethyltrialkoxysilane, preferably substantially monomethyltriethoxysilane, in ratios of 30:70 to 70:30, most preferably about 40:60. A tail solvent aids blush resistance, reduces internal stress and permits adhesion to unprimed polycarbonate. Optionally, colloidal silica sol dissolved in water-miscible solvent may be reacted in a second stage with acidic aqueous colloidal silica sol earlier silanized with monomethyltrialkoxysilane.
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Description

[0001] This is a divisional of Ser. No. 09 / 328,725, a continuation-in-part application of Ser. No. 08 / 771,866, filed Dec. 12, 1996, now abandoned, which is a divisional of Ser. No. 08 / 430,251, filed May 4, 1995, now U.S. Pat. No. 5,665,814.

[0002] The chemical family of silane / silica sol copolymer compositions finds commercial use in heat-curing scratch-resistant hardcoats applied mainly to clear plastic sheets and molded parts. The present invention makes improvements in lowering costs and improving ease of use and performance of specific chemical compositions of monomethyltrialkoxysilan-e copolymerized with acidic aqueous silica sol. These compositions are to be coated onto molded or cast optical lenses (including auto headlamp lenses and spectacle lenses and sports eyewear), plastic extruded or cast sheet (used for windows, protective covers, etc.), and other substrates needing a scratch-and scuff-protective surface finish.II. BACKGROUND OF THE INVENTION

[0003] Clark (U.S. Ser. No....

Claims

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