Ink incorporating optically variable thin film flakes

Details Ink incorporating optically variable thin film flakes Ink incorporating optically variable thin film flakes

1988-09-26

1991-10-22

Ball, Michael W.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106415, 356 71, C09D 1100, G06K 974

Patent

active

050592459

ABSTRACT:
Optically variable ink for obtaining a color shaft between two distinct two colors at first and second angles of incident light comprised of an ink vehicle and optically variable flakes disposed in the ink vehicle. The optically variable flakes are comprised of a multilayer thin film interference structure having first and second parallel planar surfaces. The optically variable flakes have physical dimensions such that when the flakes are measured in directions parallel and perpendicular respectively to the planar surfaces an aspect ratio of at least 2 to 1 is provided. The multilayer thin film structure is of symmetrical design and includes a metal reflector having first and second surfaces parallel to the first and second parallel planar surfaces and at least one period disposed on each of said first and second surfaces of the metal reflector. Each period is comprised of a dielectric layer with an index of refraction of 1.65 or less and a semi-opaque layer.

REFERENCES:
patent: 3858977 (1975-01-01), Baird et al.
patent: 4010293 (1977-03-01), Davis
patent: 4116710 (1978-09-01), Heikel
patent: 4168986 (1979-09-01), Venis, Jr.
patent: 4180407 (1979-12-01), Gibson et al.
patent: 4221593 (1980-09-01), Kubo
Polymers, Paint and Colour Journal, vol. 169, 1979, pp. 38-44.
Ch. Abstracts, vol. 100, No. 20, May 14, 1984, p. 92.

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