Coated transparencies and transparent laminates incorporating a transparent polyurethane composition
First Claim
1. A coated transparency comprising:
- a transparent substrate having an outer surface;
a thin, transparent conductive coating overlaying the substrate'"'"'s outer surface; and
a transparent polyurethane coating overlaying the transparent conductive coating, the polyurethane coating formed from a composition incorporating 0.5 to 5.0 weight percent of an ionizable salt of a perfluoroalkylsulfonimide.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention is embodied in a polyurethane composition suitable for coating, casting or laminating, which incorporates a prescribed additive selected to increase the composition'"'"'s electrical conductivity without adversely affecting the composition'"'"'s transparency and percent haze and without adversely affecting its adhesion to an underlying substrate or its environmental durability, especially with regard to humidity resistance. The prescribed additive is an ionizable metal salt of a perfluoroalkylsulfonimide, in a weight percent of 0.5 to 5.0, with the metal being an alkali metal and the preferred perfluoroalkylsulfonimide being trifluoromethanesulfonimide. The most preferred salt is lithium trifluoromethanesulfonimide. The preferred polyurethanes include both aliphatic polyetherurethanes and aliphatic polyesterurethanes. Use of the additive enhances the composition'"'"'s electrical conductivity by at least about two orders of magnitude, thereby minimizing the risk of a static charge building to a point where a shock hazard is created or the polyurethane coating or laminate is damaged by a rapid discharge of electrical current. The composition is particularly useful in an aircraft window or transparency, where it can be used as a coating or laminated film overlaying a transparent conductive coating.
16 Citations
21 Claims
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1. A coated transparency comprising:
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a transparent substrate having an outer surface; a thin, transparent conductive coating overlaying the substrate'"'"'s outer surface; and a transparent polyurethane coating overlaying the transparent conductive coating, the polyurethane coating formed from a composition incorporating 0.5 to 5.0 weight percent of an ionizable salt of a perfluoroalkylsulfonimide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A coated transparency comprising:
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a transparent substrate having an outer surface; a thin, transparent conductive coating overlaying the substrate'"'"'s outer surface; and a transparent aliphatic polyetherurethane coating overlaying the transparent conductive coating, wherein the polyetherurethane coating is formed from a composition incorporating 1.0 to 3.0 weight percent of lithium trifluoromethanesulfonimide, and wherein the polyetherurethane coating, after curing, has a volume resistivity of less than about 1×
1011 ohm-cm.
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12. A transparent laminate comprising:
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a transparent substrate having an outer surface; a thin, transparent conductive coating overlaying the substrate'"'"'s outer surface; and a transparent polyurethane layer laminated to the transparent conductive coating, the polyurethane layer formed from a composition incorporating 0.5 to 5.0 weight percent of an ionizable salt of a perfluoroalkylsulfonimide. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification