Optical: systems and elements – Signal reflector – Including a curved refracting surface
Patent
1997-12-23
1999-09-28
Phan, James
Optical: systems and elements
Signal reflector
Including a curved refracting surface
359536, 359539, 359540, 359541, G02B 5128
Patent
active
059597755
ABSTRACT:
A retroreflective article utilizing a solventless bead bond composition wherein the bead bond composition includes a urethane/acrylate interpenetrating polymer network in which the urethane polymer is a thermoplastic and the acrylate component is a thermoset. The solventless bead bond is applied as a mixture of diisocyanates, diols, multifunctional acrylates and additives and thermally cured to a rubbery, thermoplastic solid. At this point the bead bond can be softened or molded with the application of heat or stored for a period of time without loss of thermoplasticity. Final retroreflective sheeting constructions which possess superior adhesion to acrylics, toughness and high retroreflectance are achieved by curing the multifunctional acrylates with radiation.
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Joseph William D.
Pavelka Lee A.
3M Innovative Properties Company
Cleveland David R.
Phan James
LandOfFree
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