发明名称 |
METHOD OF MAKING RETROREFLECTIVE ELEMENTS |
摘要 |
A method of making a ceramic retroreflective element having enhanced strength and increased retained reflectivity. The method of the present invention comprises forming retroreflective elements by the following steps: a) providing glass flakes; b) coating said glass flakes with a first barrier layer yielding coated glass flakes; c) providing optical elements; d) optionally coating said optical elements with a second barrier layer; e) blending said optical elements and said coated glass flakes; f) heating said optical elements and said coated glass flakes to spheroidize said flakes while agitating said optical elements and said coated glass flakes; g) further heating said optical elements and said spheroidized glass flakes to partially embed said optical elements in said spheroidized flakes while agitating said optical elements and said spheriodized flakes; and h) cooling said spheroidized flakes having partially embedded optical elements. |
申请公布号 |
EP1015916(B1) |
申请公布日期 |
2003.09.03 |
申请号 |
EP19980901844 |
申请日期 |
1998.01.14 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
MATHERS, JAMES, P.;HUMPAL, KATHLEEN, M. |
分类号 |
E01F9/04;E01F9/08;G02B5/128 |
主分类号 |
E01F9/04 |
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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