Coating processes – Optical element produced – Polarizer – windshield – optical fiber – projection screen – or...
Patent
1990-01-02
1991-01-29
Beck, Shrive
Coating processes
Optical element produced
Polarizer, windshield, optical fiber, projection screen, or...
427198, 427204, 427284, 427428, B05D 506
Patent
active
049885413
ABSTRACT:
Process for making retroreflector sheet having protrusions which are retroreflective on selected side surfaces of the protrusions. Continuous web of polymeric base sheet having a front surface with a plurality, of protrusions, each protrusion having a top surface and at least one side surface, is provided. The web is conveyed through a nip in contact with a liquid film of bonding polymer at sufficient pressure to displace the film from the protrusion top surfaces and onto selected side surfaces, depending upon the relative speeds of the web and bonding polymer film. Retroreflective beads are applied to the liquid film which is then solidified (e.g., by temperature change) to hold the beads in place.
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Beck Shrive
Kirn Walter N.
Little Douglas B.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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