Title:
DIELECTRIC MIRROR RETROREFLECTIVE APPLIQUES HAVING EXCELLENT REPETITIVE LAUNDERING PERFORMANCE
Document Type and Number:
WIPO Patent Application WO2001077722
Kind Code:
A3
Abstract:
Exposed lens retroreflective appliques incorporate a monolayer of beads and a dielectric mirror proximate the beads. A pigmented or otherwise colored bead bond layer in which the beads are partially embedded is visible through the dielectric mirror, giving the article a highly colored daytimeappearance. The appliques exhibit an initial reflectivity. By appropriate materials selection, the appliques can be made to retain at least 75%, and in most instances at least 90%, of the initial reflectivity if subjected to fifty home laundering cycles. In one case the dielectric mirror includes zinc sulfide as a relatively high refractive index material and calcium fluoride as a relatively low refractive index material. In another case the dielectric mirror includes zinc sulfide as the relatively high refractive index material and silicon dioxide as the relatively low refractive index material.
Inventors:
SHUSTA JEANINE M
LIGTENBERG NORMAN D
ROBBINS WILLIAM B
LIGTENBERG NORMAN D
ROBBINS WILLIAM B
Application Number:
PCT/US2001/007592
Publication Date:
May 30, 2002
Filing Date:
March 09, 2001
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
G02B5/128; (IPC1-7): G02B5/128
Foreign References:
| US5837347A | 1998-11-17 | |||
| US4763985A | 1988-08-16 | |||
| US5645938A | 1997-07-08 | |||
| US3700305A | 1972-10-24 |
Download PDF: