Title:
SHRINKABLE IRIDESCENT FILM
Document Type and Number:
WIPO Patent Application WO2003026879
Kind Code:
A3
Abstract:
A shrinkable iridescent film constitutes an oriented multilayer coextruded iridescent film having at least 10 generally parallel, very thin layers of substantially iniform thickness in which the contiguous adjacent layers are of heat shrinkable thermoplastic resinous material, each of which is heat shrinkable in at least one dimension in the plane of the film, the continuous adjacent layers being substantially uniformly shrinkable so as to have refractive indexes which differ by at least 0.03. The shrinkable film is made by selecting appropriate thermoplastic resinous materials, coextruding them into a thick film and then subjecting the film to orientation below the heat set temperature of the resinous materials.
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Inventors:
GRANEY DANIEL J
Application Number:
PCT/US2002/027446
Publication Date:
June 05, 2003
Filing Date:
August 28, 2002
Export Citation:
Assignee:
ENGELHARD CORP (US)
International Classes:
B29C55/02; B32B7/023; B32B27/00; B32B27/06; B44F1/04; B44F1/14; B32B37/15; (IPC1-7): B32B27/08; B32B7/02; B44F1/14; G02B5/28
Foreign References:
| US5149578A | 1992-09-22 | |||
| US5089318A | 1992-02-18 | |||
| US3759647A | 1973-09-18 | |||
| US3647612A | 1972-03-07 |
Other References:
"Encyclopedia of Polymer Science and Engineering Vol. 7", JOHN WILEY & SONS, NEW YORK, XP002225686
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