Flat transparent top coat for retroreflective sheeting
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
The novel retroreflective sheeting has a flat transparent top coat which is as tough and as resistant to solvents and abrasion as are alkyd resins, and as weather resistant as are acrylic polyesters. That top coat is made from a mixture of hydroxy-functional acrylic polyol and a curing agent which is an aliphatic polyfunctional isocyanate such as the biuret of 1,6-hexamethylene diisocyanate. The retroreflective sheeting may have a dual-layer top coat, the outer layer being relatively hard to provide good resistance to solvents, abrasion and weathering, and the inner layer being softer to make the sheeting more conformable.
-
Citations
14 Claims
- 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.
Specification