| 摘要 |
PCT No. PCT/US96/01583 Sec. 371 Date Feb. 5, 1996 Sec. 102(e) Date Feb. 5, 1996 PCT Filed Feb. 5, 1996 PCT Pub. No. WO97/28470 PCT Pub. Date Aug. 7, 1997A retroreflective element which may be used in pavement markings comprising a core having (a) a central layer having first and second major surfaces and at least one vertical surface, (b) a barrier layer applied to the first major surface, and (c) a barrier layer applied to the second major surface; and a plurality of optical elements embedded in the vertical surface(s) of the central layer. |
