Low cost, blush-resistant silane/silica sol copolymer hardcoat f

Details Low cost, blush-resistant silane/silica sol copolymer hardcoat f Low cost, blush-resistant silane/silica sol copolymer hardcoat f

1995-05-04

1997-09-09

Nakarani, D. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524316, 524319, 524356, 524364, 524790, 524859, 528 28, C08L 8306

Patent

active

056658141

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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