Optical: systems and elements – Signal reflector – Including a curved refracting surface
Patent
1996-04-19
1998-07-21
Phan, James
Optical: systems and elements
Signal reflector
Including a curved refracting surface
359536, 359540, 428355N, G02B 5128
Patent
active
057841985
ABSTRACT:
An encapsulated lens retroreflective sheeting that has a bonding layer that consists essentially of a thermoplastic polyurethane resin that has a softening point of 70.degree. C. to 200.degree. C. The bonding layer is sealed to a light transmissible surface protective layer by a multitude of bonds that form spaces between the protective layer and the bonding layer. Retroreflective elements are partially embedded in the bonding layer and interface with air in the spaces. An encapsulated lens retroreflective sheeting of this construction can be adhered to a highly plasticized plastic surface and maintain high adhesion force for an extended duration while at the same time maintaining good retroreflective performance.
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patent: 5066098 (1991-11-01), Kult et al.
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Cleveland Dsvid R.
Hanson Karl G.
Minnesota Mining and Manufacturing Company
Phan James
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