Metallic printing inks and metallized papers printed therewith
AssigneeReynolds Metals Company
InventorW. Ralph Mills
Life of this patent
Estimating the term…
Abstract
A thermoplastic resin, a leafing grade aluminum paste, and a solvent are mixed to form a metallic printing ink which is useful for metallizing a wide range of paper stocks by selected conventional printing processes, such as rotogravure printing. The metallic ink can be applied at four pounds per ream (6.5 g/m.sup.2) of dry coating to form a satisfactory moisture barrier, but the ink is similar to paint in that a glossy aluminum finish is produced by leafing of the aluminum particles when the coated paper is heated, as by passing the paper over a heated roll.
Claims17
A metallic printing ink comprising a thermoplastic resin selected from the group consisting of substituted styrene copolymer resins, chlorinated rubber, and styrene resins;
- a leafing grade aluminum paste;
- and a solvent selected from the group consisting of toluene, methyl ethyl ketone, methyl isobutyl ketone, and mixtures thereof, said printing ink being applicable to coated papers and to uncoated papers and to plastics by printing processes to provide a brilliant finish after heat treatment at about 300.degree. F.;
- and said ink being further characterized by being capable of drying to a non-tacky state when exposed to temperatures in the range of between about 150.degree. and 200.degree. F. for a period of from about 1 to about 3 seconds, and by said thermoplastic resin being sufficiently soft as to permit leafing of said leafing grade paste when said ink is applied as a printed coating on a paper base and said paper base is then passed over a roller heated to a temperature of between about 200.degree. and about 400.degree. F. for about 0.5 seconds of contact with said roller.
A process for metallizing papers and plastics comprising:
- A. preparing a metallic printing ink which consists essentially of:
- (1) a thermoplastic resin binder selected from the group consisting of substituted styrene copolymer resins, chlorinated rubber, and styrene resins,
- (2) a leafing grade aluminum paste, and
- (3) a solvent selected from the group consisting of toluene, methyl ethyl ketone, methyl isobutyl ketone, and mixtures thereof;
- B. applying said printing ink to a base selected from the group consisting of paper, paperboard, and plastic film by means of a printing process selected from the group consisting of relief and intaglio printing processes and drying said applied printing ink to form a metallized coating on said base;
- and
- C. heat treating said coating at about 300.degree. F. to cause said aluminum particles to come to the surface to form a highly reflecting coating.
Dependencies are inferred from the claim text.