Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1989-04-17
1990-06-26
McCamish, Marion C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428212, 428215, 4284233, 4284235, 4284237, 4284744, 4284752, 428480, 350163, 350164, G02B 2700, B32B 2736, B32B 2740
Patent
active
049371347
ABSTRACT:
The present invention provides improved elastomeric interference films which are readily coextruded, have improved transparency, and have greater mismatches of refractive indices than those of the prior art. An improved elastomeric optical interference film comprising at least 100 alternating layers of at least first and second divergent substantially transparent elastomeric polymeric materials is provided. Adjacent layers of the first and second polymeric materials differ from each other in refractive index by at least about 0.05, and the thickness of the layers is from about 0.05 to about 0.5 micrometers. Stretching the films results in different wavelengths of light being reflected.
REFERENCES:
patent: 3711176 (1973-01-01), Alfrey, Jr. et al.
patent: 4310584 (1982-01-01), Cooper et al.
Radford et al., "Reflectivity of Iridescent Coextruded Multilayered Plastic Films", Polymer Engineering and Science, May, 1973.
Kimura et al, "Tunable Multilayer-Film Distributed Bragg Reflector Filter", J. Appl. Phys., vol. 50, No. 3, Mar. 1979.
B. Miller, "Technology Watch", Plastics World, Oct., 1988.
Schrenk Walter J.
Shrum William E.
Wheatley John A.
Cole Elizabeth M.
McCamish Marion C.
The Dow Chemical Company
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