发明名称 |
RETROREFLECTIVE SHEET COATED WITH SILICA LAYER |
摘要 |
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. |
申请公布号 |
EP0286225(B1) |
申请公布日期 |
1993.05.26 |
申请号 |
EP19880301834 |
申请日期 |
1988.03.02 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
HUANG, TZULI J. C/O MINNESOTA MINING AND |
分类号 |
B32B15/08;B32B3/18;B32B7/02;B32B17/10;B32B27/18;B32B27/20;B32B27/30;B32B27/40;C08G18/08;C08G18/75;C08G18/83;C08J3/215;C08K3/36;C09D175/04;E01F9/04;E01F9/06;G02B1/10;G02B5/12 |
主分类号 |
B32B15/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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