Low cost, blush-resistant silane/silica sol copolymer hardcoat for optical clear plastics
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United States of America Patent
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Sep 9, 1997
Grant Date -
N/A
app pub date -
May 4, 1995
filing date -
May 4, 1995
priority date (Note) -
Expired
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Abstract
An improved silane/silica sol copolymer hardcoating composition for protecting optical plastic substrates from scratching is able to be manufactured at lower costs and to provide much-improved ease of use in transportation, storage, dipbath 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 an monomethyl trialkoxy silane, preferably substantially monomethyltriethoxysilane, in ratios of 30:70 to 70:30, most preferably about 40:60. A tail solvent aids blush resistance and 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 monomethyl trialkoxy silane.
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