Pigment-free coatings with improved resistance to weathering

Details Pigment-free coatings with improved resistance to weathering Pigment-free coatings with improved resistance to weathering

1979-05-02

1981-06-23

Smith, Ronald H.

Stock material or miscellaneous articles

Composite

Of polycarbonate

10628716, 10628719, 252313S, 252317, 427163, 427165, 427387, 427389, 4273899, 427393, 4273935, 4273936, 428 35, 428429, 428447, 428457, 428500, B32B 2736

Patent

active

042751187

ABSTRACT:
A pigment-free coating composition comprising an acidic dispersion of colloidal titania, colloidal silica and hydroxylated silsesquioxane in an alcohol-water medium. A coating of the composition cured on a plastic substrate such as polycarbonate results in a hard, abrasion-resistant protective coating. Such coatings transmit visible light, but absorb wavelengths of ultraviolet light which cause degradation of the substrate surface and resultant adhesion-loss of the protective coating upon weathering. A cured coating of these compositions deposited on metal substrates such as aluminum results in a hard, abrasion resistant coating which offers slightly more corrosion protection than such a composition without colloidal titania.

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