Refflective film and method for making reflective film

Details Refflective film and method for making reflective film Refflective film and method for making reflective film

2006-03-14

2006-03-14

Seidleck, James J. (Department: 1711)

Radiation imagery chemistry: process, composition, or product th

Liquid crystal process, composition, or product

C299S015000, C299S015000, C299S015000, C522S001000, C428S001100, C428S001200, C428S001310, C427S496000, C427S508000, C427S163300, C427S163400, C427S162000

Reexamination Certificate

active

07011913

ABSTRACT:
A method of making a reflective film includes the steps of: (a) preparing a cholesteric mixture that includes a cholesteric liquid crystal material and at least one type of polymerizable compound; (b) forming a cholesteric mixture layer in which the cholesteric liquid crystal material forms a helical structure, having continuously changing helical pitches, approximately along a normal to the layer; and (c) exposing the cholesteric mixture layer to an actinic ray at a temperature, at which the cholesteric mixture exhibits a cholesteric phase, thereby polymerizing the at least one type of polymerizable compound. In this method, a Tni point of the cholesteric mixture increases by performing the step (c).

REFERENCES:
patent: 6099758 (2000-08-01), Verrall et al.
patent: 6217948 (2001-04-01), Verrall et al.
patent: 6319963 (2001-11-01), Coates et al.
patent: 6344885 (2002-02-01), Mori et al.
Kozachenko and Kutulya, “Multicolor Texture Formation in Reflective Cholesteric Displays”, SID, pp. 272-275 (2000).
Broer et al, “Wide-band reflective polarizers from cholesteric polymer networks with a pitch gradient”, Nature 378:467-469 (1995).

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