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Optical interference pigment and method for producing same

A manufacturing method and light interference technology, applied in organic dyes, dyeing physical treatment, etc., can solve problems that have not been studied before, and achieve good light reflection performance

Inactive Publication Date: 2015-11-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the light interference particles obtained by crushing the light reflection film immobilized by curing the cholesteric liquid crystal phase and cleaning it have not been studied in the prior art including Patent Documents 1 and 2.

Method used

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  • Optical interference pigment and method for producing same
  • Optical interference pigment and method for producing same
  • Optical interference pigment and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8 and comparative example 1～6

[0366] (Preparation of Coating Solution)

[0367] Coating solutions (A) and (B) shown in the table below were prepared, respectively.

[0368] [Table 1]

[0369] Coating solution (A): for producing a layer that reflects right circularly polarized light having a maximum value of reflectance at 380 nm

[0370]

[0371] [Table 2]

[0372] Coating solution (B): for producing a layer that reflects left circularly polarized light having a maximum value of reflectance at 380 nm

[0373]

[0374] [chem 35]

[0375] Rod-shaped liquid crystal compound: compound 1

[0376]

[0377] [chem 36]

[0378] Alignment control agent (1): JP-A-2012-211306, compound (2) of paragraph [0022]

[0379]

[0380] [chem 37]

[0381] Orientation Control Agent(2)

[0382]

[0383] [chem 38]

[0384] Chiral agent: Compound (5) of Japanese Patent No. 4287599

[0385]

[0386] (Ultraviolet light with a wavelength of 380nm is irradiated to form a film with a cholesteric liquid crystal ...

Embodiment 9

[0412] As the base film, instead of the PET film, a film formed as follows: a strip-shaped film made of triacetyl cellulose (manufactured by FUJITAC, Fuji Film Co., Ltd., thickness: 100 μm, width: 500 mm, glass transition temperature: 145° C.) was used. One side of the film was coated with a 5% by weight solution of long-chain alkyl-modified polyvinyl alcohol (MP-203, manufactured by KURARAY Co., Ltd.), dried at 90° C. for 4 minutes, and then rubbed to form a 2.0-μm-thick film. As the resin layer for forming an alignment film, a film in which the resin layer for forming an alignment film having a film thickness of 2.0 μm was formed was used as a base film.

[0413] Except for this, the optical interference pigment was produced by the same method as in Example 3, and the evaluation of the optical interference pigment was performed, and the evaluation was also A.

Embodiment 10

[0415] As the substrate, instead of the PET film, a film formed as follows was used: one side of a glass plate with a thickness of 2 mm was coated with long-chain alkyl-modified polyvinyl alcohol (MP-203, manufactured by KURARAY Co., Ltd.) in the same manner as in Example 8. ) 5% by weight solution, dried at 90° C. for 4 minutes, and rubbed to form a resin layer for forming an alignment film with a film thickness of 2.0 μm. The film formed with the resin layer for forming an alignment film with a film thickness of 2.0 μm was used as a substrate film. Except for this, the optical interference pigment was produced by the same method as in Example 3, and the evaluation of the optical interference pigment was performed, and the evaluation was also A.

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Abstract

The present invention provides a method for producing an optical interference pigment, said method being characterized by comprising a step of hardening the alignment state of a polymerizable liquid crystal compound to produce a film having a fixed cholesteric liquid crystal structure, a step of crushing the film having a cholesteric liquid crystal structure to produce optical interference particles, and a step of washing the optical interference particles at a temperature of 35˚C or higher using at least an organic solvent having an SP value of 8.5 to 12 (cal / cm3)1 / 2, wherein the SP value represents a solubility parameter (δ) as measured by a Hoy method and is represented by formula (1): δ = (ΔE / V)1 / 2 (wherein V represents the molar molecular volume of the solvent; and ΔE represents a cohesive energy). The production method enables the provision of an optical interference pigment that has good light reflection performance at a selective reflection wavelength when being dispersed in a dispersion medium.

Description

technical field [0001] The present invention relates to optical interference pigments and methods for their manufacture. Background technique [0002] It is well known that a light reflective film immobilized by curing a cholesteric liquid crystal phase reflects a part of circularly polarized light and transmits the other part of light in principle under the condition of selective reflection wavelength. As an application of such a light reflective film that is solidified and fixed by cholesteric liquid crystal phase, it is known that the light reflective film that is solidified and fixed by cholesteric liquid crystal phase is crushed, and the obtained particles are used as light reflection film. interfering particles. For example, Patent Document 1 describes a method in which a cholesteric liquid crystal phase is cured by ultraviolet irradiation, the immobilized light reflection film is peeled off from a carrier, pulverized, and classified by sieving to produce Pigments th...

Claims

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Application Information

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IPC IPC(8): C09C3/04C08J3/12C09B67/20C09B67/54
CPCC08J3/12C08J2367/00C09B67/00C09B67/0098C09B69/101C09B69/105C09B69/106C09B69/107C09B69/109
Inventor 冲和宏
Owner FUJIFILM CORP
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