Patent ID: 7070646
Filing Date: 2006-07-04
Classification: C09D,G03G

Abstract:
1. In a security method comprising application of an ink composition, the improvement wherein the composition comprises a charge generating material and a medium wherein the charge generating material has an absorption maximum in each of the near infra-red region from 700 to 1500 nm and visible region from 400 to 700 nm of the electromagnetic spectrum and is a compound selected from the polymorph type X form of metal free phthalocyanine, the polymorph type Y form and Phase I & II forms of titanyloxy phthalocyanine, the polymorph Phase II form of vanadyloxy phthalocyanine, and the polymorph Phase V forms of hydroxygallium phthalocyanine and methoxygallium phthalocyanine and wherein the charge generating material acts as a colorant of the composition.