US Patent No: 4,755,425
Number of patents in Portfolio can not be more than 2000
Retroreflective sheet coated with silica layer
Stats
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Jul 5, 1988
Issued date -
Mar 9, 1987
filing date -
07/023,375
serial no -
Expired
status
Importance
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Abstract
Retroreflective sheeting has been improved by a coating comprising silica and a transparent polymer selected from aliphatic polyurethanes and polyvinyl chloride copolymers having a minor amount of a comonomer containing at least one carboxylic acid or hydroxyl moiety. Silica comprises 10-80 weight percent of the transparent protective coating. For example, a solution or dispersion of polyurethane is mixed with a silica sol and possibly other ingredients (e.g. wetting agent, UV light absorber and adhesion promoter), and the composition is coated onto the retroreflective sheet and dried. The coated retroreflective sheeting has superior soil and dew repellancy, retaining a higher percentage of original brightness after exposure to dirt and/or dew conditions.
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First Claim
Related Publications
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International Classification(s)
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,311,763 Silicone resin coating composition | 19 | 1980 | |
| 4,476,281 Silicone resin coating composition | 28 | 1982 | |
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| 4,367,920 Retroflective sheeting | 68 | 1981 | |
| 4,505,967 High-angularity retroreflective sheeting and method for manufacture | 59 | 1983 | |
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| 4,442,177 Alkyl ether methylolmelamine coating composition, coating process and transparent product | 8 | 1981 | |
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| 4,596,745 Non-glare coating | 24 | 1984 | |
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| 4,600,735 Soil-repellent coating composition | 8 | 1985 | |
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| 8,202,403 Core de-entrainment device for vessels with tangential inlets | 6 | 2008 | |
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| 4,528,319 Sag control of high solid polyurethane clearcoats by urea thixotrope/silica systems | 17 | 1984 | |
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| 4,409,285 Surface-modifying coating compositions | 44 | 1981 | |
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| 4,513,112 High build, ambient cure coating compositions | 8 | 1984 | |
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| 4,522,958 High-solids coating composition for improved rheology control containing chemically modified inorganic microparticles | 109 | 1983 | |
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| 4,576,864 Water spreading plastic material, method for its manufacture and its use as a glazing and roofing material | 37 | 1985 | |
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| 4,554,214 Casting coating | 10 | 1982 | |
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| 4,211,823 Tintable coatings and articles having such coatings | 86 | 1979 | |