Relation to security printing
AssigneeInovink Limited
InventorsDieter Guhl, Angus Robert Ward, David Andrew Bedford
Life of this patent
Estimating the term…
Abstract
An article comprising a substrate which carries a material of formula (I) M1aM2bWcOd(P(O)nRm)e (I) wherein each of M1 and M2 is independently ammonium or a metal cation; a is 0.01 to 0.5; b is 0 to 0.5; c is 1; d is 2.5 to 3; e is 0.01 to 0.75; n is 1, 2 or 3; m is 1, 2 or 3; and R is an optionally substituted hydrocarbyl group.
Claims10
An article comprising a substrate which carries a material of formula (I)
- M1aM2bWcOd(P(O)nRm)e (I)
- wherein each of M1 and M2 is independently ammonium or a metal cation;
- a is 0.01 to 0.5;
- b is 0 to 0.5;
- c is 1;
- d is 2.5 to 3;
- e is 0.01 to 0.75;
- n is 1, 2 or 3;
- m is 1, 2 or 3;
- and R is an optionally substituted hydrocarbyl group.
An ink composition comprising a material of formula (I)
- M1aM2bWcOd(P(O)nRm)e (I)
- wherein each of M1 and M2 is independently ammonium or a metal cation;
- a is 0.01 to 0.5;
- b is 0 to 0.5;
- c is 1;
- d is 2.5 to 3;
- e is 0.01 to 0.75;
- n is 1, 2 or 3;
- m is 1, 2 or 3;
- and R is an optionally substituted hydrocarbyl group.
A method of providing a covert security image or a hidden coating on a banknote, comprising applying to the banknote an ink composition comprising a material of formula (I)
- M1aM2bWcOd(P(O)nRm)e (I)
- wherein each of M1 and M2 is independently ammonium or a metal cation;
- a is 0.01 to 0.5;
- b is 0 to 0.5;
- c is 1;
- d is 2.5 to 3;
- e is 0.01 to 0.75;
- n is 1, 2 or 3;
- m is 1, 2 or 3;
- and R is an optionally substituted hydrocarbyl group.
Dependencies are inferred from the claim text.