Process and compositions for lithographic printing in multiple layers

• US 4,536,218 A
• Filed: 02/08/1984
• Issued: 08/20/1985
• Est. Priority Date: 02/09/1983
• Status: Expired due to Fees

• Current Assignee: Eli A. Ganho
• Original Assignee: Eli A. Ganho
• Inventors: Ganho, Eli A.
• Primary Examiner(s): Cockeram, Herbert S.
• Application Number:
  US06/578,556
• Time in Patent Office: 559 Days
• Field of Search: 106/290, 106/300, 106/307, 106/310, 106/316, 427/258, 428/499, 524/270-274, 524/284, 524/313, 524/441, 524/477-478, 524/764, 524/798, 527/600
• US Class Current: 524/270
• CPC Class Codes: B41M 3/005 Colour cards; Painting supports; Latent or hidden images, e.g. for games; Time delayed images
• CPC Class Codes: B41M 3/14 Security printing securities B42D25/29
• CPC Class Codes: Y10S 283/901 Concealed data
• CPC Class Codes: Y10S 283/903 Lottery ticket
• CPC Class Codes: Y10T 428/31851 Natural oil

Abstract

Printed materials such as tickets, lottery forms, cards and contest forms, bearing a hidden message which is revealable by scratching off a covering opaque layer, are prepared by printing the message on the substrate, lithographing a protective layer such as a clear varnish or a pigmented varnish-ink over the hidden message, and then lithographing a hiding coat over the applied protective layer. The protective layer formulation and the hiding coat layer are both based upon compatible, preferably the same, film forming resin systems, and are deposited from a common solvent. The protective layer may provide a clear, colorless transparent film through which the message may be viewed, or a colored see-through layer, so that it constitutes one color layer also for the printing of other areas of the substrate.

Claims

1. A varnish composition suitable for lithographic application to a substrate to cover indicia printed thereon preparatory to hiding said indicia with an abrasively removable hiding coat, said composition including the following ingredients in the following approximate weight range:

space="preserve" listing-type="tabular">______________________________________ Components % Range ______________________________________ Magie oil (solvent) 30-35 Phenolic modified rosin ester 16-20 Hydrocarbon resin 13-17 Linseed-[isophtholic] isophthalic alkyd 10-13 Hydrocarbon plasticizer 7-10 Montan wax 3-6 Calcium perborate 1.5-3 Maganese octoate 1.5-2 Cobalt octoate 0.5-1 Gelling agent 0.5-0.7 Chinawood oil 0.3-0.5 ______________________________________

3. A hiding coat composition suitable for lithographic application over a cured varnish coating as claimed in claim 1, and including the following ingredients in the following approximate weight ranges:

space="preserve" listing-type="tabular">______________________________________ Components % Range ______________________________________ Titanium dioxide 28-35 Aluminum powder 15-20 Phenolic modified rosin ester 15-18 Linseed oil refined 9-11 Black pigment (carbon black) 7-8 Linseed-isophthalic alkyd 5-8 Magie solvent 5-7 Cobalt octoate 0.5-1 Chinawood oil 0.5-1 Hydrocarbon resin 0.5-1 Polyethylene wax 0.3-0.5 Fischer-Tropsch wax 0.2-0.5 Gelling agent 0.5-1 ______________________________________

2. A pigmented varnish-ink composition suitable for lithographic application to a substrate to cover indicia printed thereon preparatory to hiding said indicia with an abrasively removable hiding coat, said composition including the following ingredients in the following approximate weight range:

space="preserve" listing-type="tabular">______________________________________ Components % Range ______________________________________ Magie oil (paraffin based solvent) 20-28 Phenolic modified rosin ester 14-18 Hydrocarbon resin 8-12 Linseed-isophthalic alkyd 6-10 Hydrocarbon plasticizer 6-8 Montan wax 2-5 Calcium perborate 1-3 Manganese octoate 1-2 Cobalt octoate 0.5-1 Gelling agent 0.3-0.5 Chinawood oil 0.3-0.5 Pigment 16-25 ______________________________________

4. A hiding coat suitable for lithographic application over a cured pigmented varnish-ink composition according to claim 2, and including the following ingredients in the following approximate weight range:

space="preserve" listing-type="tabular">______________________________________ Components % Range ______________________________________ Titanium dioxide 28-35 Aluminum powder 15-20 Phenolic modified rosin ester 15-18 Linseed oil refined 9-11 Black pigment (carbon black) 7-8 Linseed-isophthalic alkyd 5-8 Magie solvent 5-7 Cobalt octoate 0.5-1 Chinawood oil 0.5-1 Hydrocarbon resin 0.5-1 Polyethylene wax 0.3-0.5 Fischer-Tropsch wax 0.2-0.5 Gelling agent 0.5-1 ______________________________________