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Flat transparent top coat for retroreflective sheeting

  • US 4,808,471 A
  • Filed: 01/04/1988
  • Issued: 02/28/1989
  • Est. Priority Date: 03/01/1985
  • Status: Expired due to Term
First Claim
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1. Retroreflective sheeting have a flat, transparent, tough, solvent-resistant, abrasion-resistant and weather-resistant top coat made form a mixture of hydroxy-functional acrylic polyol and aliphatic polyfunctional isocyanate which serves as curing agent for the polyol, said top coat having a toughness index, defined as the multiplication product of the elongation and tensile strength of the top coat in, respectively, percent and kilograms per square centimeter, of at least 6175.

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