B - Operations – Transporting – 42 – D
Patent
B - Operations, Transporting
42
D
B42D 15/10 (2006.01) B41M 3/14 (2006.01) B41M 7/00 (2006.01) B41M 5/00 (2006.01)
Patent
CA 2419190
A method of preparing a security document which comprises printing on at least one side of a security paper and thereafter applying tout least one side of the printed security paper over the printing a substantially transparent coating composition comprising an unpigmented polyurethane and/or polyacrylate, said coating composition being such as to provide a film, when cast on a glass surface, that has a Konig hardness of from 15 to 130 seconds, and also passes the water resistance test as defined by the following steps: (a) the total formulation to be used in the coating is cast on a glass plate so as to produce a film with a dry weight of 80 g/m2; (b) the film is initially dried at 23 °C and once tack free dried for an additional hour at 80 °C; (c) the film is weighed before being wetted and tested for tensile strength and Young's Modulus and is visually checked for any change in transparency; (d) a sample of the film is boiled in water containing 10 g/litre Na2CO3 for 30 minutes; (e) the film is then rinsed in cold water and the steps (b) to (c) are then repeated; wherein when the film is dried and re-weighed the film meets the following criteria: (i) the wet tensile strength and Young's Modulus of the boiled film are not less that 90% of the initial film wet tensile strength and Young's Modulus; (ii) the film shows no perceptible loss of transparency; and (iii) the dried weight of the film is not less than 98% of the original weight.
Dean Julia Ruth
Howland Paul
Stone David
de La Rue International Limited
Ridout & Maybee Llp
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