C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
117/195, 400/551
C09D 5/33 (2006.01) C08G 18/08 (2006.01) C08G 18/75 (2006.01) C08G 18/83 (2006.01) C08J 3/215 (2006.01) C08K 3/36 (2006.01) C09D 175/04 (2006.01) E01F 9/04 (2006.01) E01F 9/06 (2006.01) G02B 1/10 (2006.01) G02B 5/12 (2006.01) G02B 5/13 (2006.01)
Patent
CA 1336303
Retroreflective sheeting has been improved by a coating comprising silica and a transparent polymer selected from aliphatic polyurethanes, polyvinyl chloride copolymers having a minor amount of a comonomer containing at least one carboxylic acid or hydroxyl moiety, and acrylic polymers. Silica comprises 10-80 weight percent (10-70% in the case of polyacrylates) 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.
560809
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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