Microsphere-based retroreflective articles with enhanced retrore

Details Microsphere-based retroreflective articles with enhanced retrore Microsphere-based retroreflective articles with enhanced retrore

1989-05-26

1990-09-18

Arnold, Bruce Y.

350109, G02B 5128, G02B 5136

Patent

active

049573357

ABSTRACT:
Microsphere-based retroreflective articles having exceptionally high retroreflective brightness, particularly at divergence angles of up to 0.5.degree. may be made by selection of microspheres having defined combinations of average diameter and average refractive index.

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McCrone, Walter et al., Polarized Light Microscopy, McCrone Research Institute, Chicago, Ill., Jan. 1988.

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