Multi-layered magnetic pigments and foils

a magnetic pigment and multi-layer technology, applied in the field of multi-layer magnetic pigments and foils, can solve the problems of not discussing the use of optical thin film stacks or platelets employing magnetic layers, not using poorly reflecting metals, and not teaching the use of thin film optical stacks. , to achieve the effect of high chroma durability paint, wide range of color shifting properties

Inactive Publication Date: 2002-10-31
FLEX PRODUCTS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0126] The magnetic color shifting flakes of the present invention are particularly suited for use in applications where colorants of high chroma and durability are desired. By using the magnetic color shifting flakes in a colorant composition, high chroma durable paint or ink can be produced in which variable color effects are noticeable to the human eye. The color shifting flakes of the invention have a wide range of color shifting properties, including large shifts in chroma (degree of color purity) and also large shifts in hue (relative color) with a varying angle of view. Thus, an object colored with a paint containing the color shifting flake...

Problems solved by technology

However, Batzar does not discuss the use of optical thin film stacks or platelets employing a magnetic layer.
In addition, although the stainless steel flakes used in Batzar are suitable for decorating cookware, they are poorly reflecting.
Like Batzar, however, Pratt uses poorly reflecting metals and does not teach the use of thin film optical stacks.
However, the overlying magnetic material downgrades the reflective properties of the pigment because aluminum is the second brightest metal (after silver), meaning any magnetic material is less reflective.
Further, Schmid starts with aluminum platelets generated from ballmilling, a meth...

Method used

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  • Multi-layered magnetic pigments and foils
  • Multi-layered magnetic pigments and foils
  • Multi-layered magnetic pigments and foils

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0148] A magnetic ink sample was prepared by mixing a 0.5 g sample of the magnetic pigment of Example 1 (Al / Fe / Al) with 3.575 g of standard Intaglio ink vehicle (high viscosity ink vehicle) and 0.175 g of an ink dryer. The ink sample was drawn down onto paper using a flat putty knife. A magnetic strip with the word "FLEX" cut out from it was placed beneath the paper during the drawing down step. The pattern of the magnetic lines in the dried magnetic ink was readily visible as black and white (silver color) strips with the word "FLEX" readily apparent. The optical image of the word "FLEX" in the ink sample was visible at normal incidence and at approximately a 45 degree angle of viewing.

example 3

[0149] A magnetic ink sample was prepared as in Example 2 using an Intaglio ink vehicle and coated over paper having a sheet magnet placed behind it. The magnet had a cut out of a stylized letter "F." In addition to the magnetic pigment (Al / Fe / Al) orienting along the magnetic field lines, the cut out "F" was embossed upward away from the paper and was bright silver in appearance. The "F" stood out over the surrounding area by about 6 microns. This was caused by the paper pushed slightly into the "F" recess of the magnet by the force of the putty knife drawing down the highly viscous Intaglio ink. Alter the paper relaxed, the "F" area remained bright with the Al / Fe / Al flakes oriented parallel to the surface of the paper but in a stepped-up height above the surrounding coating.

example 4

[0150] A stylized letter "F" was cut out of a flexible sheet magnet using an exacto knife. A draw-down card was placed on top of and in contact with the sheet magnet. A magnetic color shifting pigment according to the invention was mixed with an acrylic resin based vehicle and applied to the card with a #22 wire metering rod. The resultant draw-down had striped superimposed black lines that replicated the field pattern outside of the stylized "F" in the sheet magnet below the card. The entire surface of the drawn-down card exhibited color shifting effects. Where the pattern of the stylized "F" was observed, the stylized "F" only had color shifting effects, while the background had both color shifting effects and the superimposed black lines.

[0151] The cut out stylized letter "F" pieces from the sheet magnet were used in another draw-down with the same magnetic pigment and vehicle described previously in this example. The resultant draw-down had striped superimposed black lines that ...

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Abstract

Multilayered magnetic pigment flakes and foils are provided. The pigment flakes can have a symmetrical coating structure on opposing sides of a magnetic core, or can be formed with encapsulating coatings around the magnetic core. The magnetic core can be a magnetic layer between reflector or dielectric layers, a dielectric layer between magnetic layers, or only a magnetic layer. Some embodiments of the pigment flakes and foils exhibit a discrete color shift so as to have distinct colors at differing angles of incident light or viewing. The pigment flakes can be interspersed into liquid media such as paints or inks to produce colorant compositions for subsequent application to objects or papers. The foils can be laminated to various objects or can be formed on a carrier substrate.

Description

[0001] 1. The Field of the Invention[0002] The present invention relates generally to pigments and foils. In particular, the present invention relates to multilayered pigment flakes and foils which have magnetic layers, and pigment compositions that incorporate multilayer pigment flakes having magnetic layers.[0003] 2. The Relevant Technology[0004] Various pigments, colorants, and foils have been developed for a wide variety of applications. For example, magnetic pigments have been developed for use in applications such as decorative cookware, creating patterned surfaces, and security devices. Similarly, color shifting pigments have been developed for such uses as cosmetics, inks, coating materials, ornaments, ceramics, automobile paints, anti-counterfeiting hot stamps, and anti-counterfeiting inks for security documents and currency.[0005] Color shifting pigments, colorants, and foils exhibit the property of changing color upon variation of the angle of incident light, or as the vi...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09J7/02C09C1/62C09C1/64C09D5/23C09D5/29C09D7/12C09D11/00C09D201/00
CPCB41M3/14Y10T428/257B42D2035/24C01P2004/52C01P2004/54C01P2004/61C01P2004/86C01P2006/42C01P2006/60C01P2006/65C01P2006/66C01P2006/90C09C1/0015C09C1/0078C09C1/62C09C2200/1008C09C2200/1025C09C2200/1054C09C2200/1058C09C2200/1091C09C2200/24C09C2200/301C09C2220/20Y10S428/90B42D25/29Y10T428/25Y10T428/2982Y10T428/254Y10T428/2993Y10T428/256Y10T428/2991B42D2033/16B32B5/16B42D25/369
Inventor PHILLIPS, ROGER W.LEGALLEE, CHARLOTTE R.MARKANTES, CHARLES T.COOMBS, PAUL G.
Owner FLEX PRODUCTS INC
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