Back to results
US 2001/0024719 A1Published application
Low-cost, user-friendly hardcoating solution, process and coating
OwnerWilliam Lewisinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerWilliam Lewisinventor
Estimating the term…
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.
A method for imparting improved abrasion resistance to a solid substrate, comprising the steps of:
An improved coated article comprising a substrate coated with a liquid thermosettable hardcoating composition comprising a condensation-reaction copolymerization product of a colloidal silica sol, or at least functionally equivalent solvent-based sol, metal oxide particle suspension or metal ester or mixture therewith, with [a silane ester mix consisting primarily or exclusively of monomethyltrialkoxysilane] one or more monomethyltrialkoxysilanes consisting of less than 50 mole percent monomethyltrimethoxysilane, and said reaction product being with an additive means of promoting cure, and at least one tail solvent;
An improved article with PSW test resistance to at least #000 steel wool, comprising a substrate coated with a dried and cured hardcoating composition comprising a reaction product of a colloidal silica sol, or at least functionally equivalent solvent-based sol, metal oxide particle suspension or metal ester or mixture therewith, with [a silane ester mix consisting primarily or exclusively of monomethyltrialkoxysilane] one or more monomethyltrialkoxysilanes consisting of less than 50 mole percent monomethyltrimethoxysilane, and said reaction product being with an additive means of promoting cure, and at least one tail solvent, said substrate optionally base coated and/or primed for smoothness, visual depth, adhesion, or other functional or cosmetic enhancement, wherein the improvement is enhanced abrasion resistance and/or reduced cost or manufacturing environmental impact versus the unimproved article.
Dependencies are inferred from the claim text.