Broad band-cholesteric liquid crystal film and process for producing the same, circularly polarizing plate, linearly polarizing element, illuminator, and liquid-crystal display
First Claim
Patent Images
1. A manufacturing method for a broad band cholesteric liquid crystal film comprising:
- polymerizing a liquid crystal mixture that is free of an ultraviolet absorbent, containing a polymerizable mesogen compound (a), a polymerizable chiral agent (b) and a photopolymerization initiator (c) between two substrates, by irradiation of one side with ultraviolet light having an intensity of 1 to 20mW/cm2, wherein the two substrates are made of the same material, the broad band cholesteric liquid crystal film has a reflection bandwidth of 300 nm or more, a pitch length in the cholesteric liquid crystal film changes so as to narrow continuously from a side irradiated with ultraviolet light, and the pitch length is changed such that the difference in pitch length between the side of ultraviolet light irradiation and the opposite side is made at least 100 nm.
1 Assignment
0 Petitions
Accused Products
Abstract
A broad band cholesteric liquid crystal film of the present invention comprises a cholesteric liquid crystal film obtained by polymerizing a liquid crystal mixture containing a polymerizable mesogen compound (a), a polymerizable chiral agent (b) and a photopolymerization initiator (c) between two substrates with ultraviolet light, and has a reflection bandwidth of 200 nm or more. The broad band cholesteric liquid crystal film of the present invention has a broad reflection band and is excellent in durability.
-
Citations
10 Claims
-
1. A manufacturing method for a broad band cholesteric liquid crystal film comprising:
- polymerizing a liquid crystal mixture that is free of an ultraviolet absorbent, containing a polymerizable mesogen compound (a), a polymerizable chiral agent (b) and a photopolymerization initiator (c) between two substrates, by irradiation of one side with ultraviolet light having an intensity of 1 to 20mW/cm2, wherein the two substrates are made of the same material, the broad band cholesteric liquid crystal film has a reflection bandwidth of 300 nm or more, a pitch length in the cholesteric liquid crystal film changes so as to narrow continuously from a side irradiated with ultraviolet light, and the pitch length is changed such that the difference in pitch length between the side of ultraviolet light irradiation and the opposite side is made at least 100 nm.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification