Liquid crystal composition for polymer-dispersed liquid crystal device, and liquid crystal device using the same

Abstract

The present invention provides a polymer-dispersed liquid crystal device which has excellent binding performance with a film substrate, can sustain white turbidance in being bended and can be driven with a low voltage, and a liquid crystal composition used for the polymer-dispersed liquid crystal device. The liquid crystal composition for polymer-dispersed liquid crystal device according to the invention contains the following components: at least one compound represented by a general formula (I-1) as a first component; at least one polymer compound selected from a compound represented by a general formula (II-1), multifunctional(methyl) acrylate compound and (methyl)methacrylate low polymer as a second component; and at least one non-polymeric liquid crystal compound as a third component, and at least one photopolymerization initiator as a fourth component. The invention also provides a light adjusting film which uses the liquid crystal composition for the polymer-dispersed liquid crystal device, and light adjusting glass with the light adjusting film which is clamped by two glass substrates.

Description

technical field [0001] The present invention relates to a composition for a polymer dispersed liquid crystal element and a polymer dispersed liquid crystal element using the composition. Background technique [0002] Since the polymer dispersed liquid crystal element does not require a polarizing plate, it has the advantage of being able to realize a brighter display compared with the existing TN, STN, IPS, or VA mode liquid crystal display elements that use a polarizing plate, and the structure of the element is also simple. , so it is used in optical shutter applications such as dimming glass and segment display applications such as clocks. [0003] There are several types of polymer dispersed liquid crystal elements, for example, a type called NCAP (Patent Document 1), a type called PDLC (polymer dispersed LC) (Patent Document 2, Patent Document 3), A type called PNLC (Polymer Network LC) (Patent Document 4) and the like. [0004] Here, types called PDLC and PNLC among ...

AI Technical Summary

Problems solved by technology

[0009] However, if the conventional polymer-dispersed liquid crystal composition is used, there is a problem of poor adhesion to the film substrate and rapid peeling

These problems are existing problems in the past, although improvement methods have been developed by adding phosphorus-based additives and using acrylate monomers or oligomers having carboxyl groups (Patent Document 5 and Patent Document 6), but these alone are not enough

[0010] In addition, the so-called film substrate can be made, which means that it can be set in a bent state, unlike the glass substrate. However, if the light-adjusting film made of existing materials is bent, there is still stress to align the liquid crystal material and change the scattering properties. weak question

In response to this problem, although Patent Document 7 describes a method of peeling off the light-adjusting layer forming material from the substrate side, the problem cannot be fundamentally solved because the adhesion with the substrate is almost lost.

[0011] In addition, although a method of using urethane-based diacrylate flexible oligomers and the like was also tried (Patent Document 7), the problem was still not completely solved, and there was no mention of the white turbidity maintenance when it was bent.

[0012] Although Patent Document 9 describes an example containing the second component and the third component described in claim 1 of the present application as a comparative example, the driving voltage is as high as 130v or more. Sustainability is not mentioned at all

[0013] Furthermore, there has been no polymer-dispersed liquid crystal composition and a device using the same, which can combine the above-mentioned characteristics of adhesiveness and white turbidity when bent, and can be driven at a low voltage.

Images