Patent ID: 7175901
Filing Date: 2007-02-13
Classification: C03C,C09D,D06P,G02B,Y10T

Abstract:
1. A combination of ingredients forming a retroreflective ink, the combination comprising metallised retroreflective elements, microbeads additional to said retroreflective elements and/or constituting said retroreflective elements at least in part, a binder chemical for attaching the retroreflective elements and microbeads to a substrate to which the ink is to be applied, the binder chemical being a polyvinylidene chloride co-polymer, a coupling agent for coupling the microbeads and cross-linking the binder chemical, the coupling agent being a mixture of an aminoalkyl silanetriol and a blocked hexamethylene diisocyanate trimer, and a buffer, the coupling agent being unreactive and uncured until a curing step is carried out and reactive when the curing step is carried out during which a temperature of the substrate and ink applied to the substrate is elevated to between 60 and 200° C., the coupling agent having a storage life of not less than about 3 months and being unreactive except at elevated temperature of the curing step.