Optically anisotropic particles and method for producing same, and complex and display device using same
A technology of optical anisotropy and particle swarms, applied in chemical instruments and methods, optics, optical components, etc., can solve the problems of image tone distortion, complicated structure, impracticality, etc., and achieve the goal of preventing display from darkening, simple and good manufacturing , the effect of suppressing the decrease of brightness
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Embodiment 1
[0090] Into 100 parts by weight of an acrylic polymerizable liquid crystal material obtained as Polymer 1 ("PaliocolorLC-242" manufactured by BASF Corporation, liquid crystal transition temperature 65°C, isotropic phase transition temperature 118°C), a polymerization initiator (Cabastin Chemical production, "Irgacure907") 5 parts by weight. After adding this mixture to a 10 wt% aqueous solution of polyvinyl alcohol, it was heated to 80° C. and stirred well. After stirring, it was confirmed that the mixed liquid was in an emulsified state. While stirring the emulsion, irradiate light (3W / cm2) from a high-pressure mercury lamp at 60 to 70°C 2 ) for 10 minutes, polymerized and fixed in the state of liquid crystal droplets. Then, the polymerized-fixed liquid crystal droplets were separated from the dispersion medium, washed sufficiently with water, and dried, whereby optically anisotropic particles (average particle diameter: 4.1 μm) were obtained.
[0091] 10 wt% of the optica...
Embodiment 2
[0094] 2 wt% of the optically anisotropic particles obtained in the same manner as in Example 1 were mixed with an acrylic adhesive (solvent: ethyl acetate, toluene, mixed solvent, 20 wt% solid content) and stirred to prepare an adhesive solution. This adhesive solution was applied on the TAC film and dried to form an adhesive layer with a thickness of 25 μm on the TAC film.
[0095] The TAC film produced in this way was attached to the front of the liquid crystal display device through the adhesive agent, and the image from the polarizing plate of the liquid crystal display device was observed. As a result, even if the transmission axis of the polarizing plate was rotated, the image could be recognized and displayed. The screen is not dimmed.
Embodiment 3
[0097] 5 wt% of the optically anisotropic particles obtained in the same manner as in Example 1 were mixed with an ultraviolet curable adhesive and stirred to prepare a composite material (or a translucent filler) containing the optically anisotropic particle group. This filling material was filled in the gap between two facing glass sheets using a spacer of 80 μm, and then irradiated with light from an ultraviolet irradiation device using a high-pressure mercury lamp as a light source for 100 seconds.
[0098] The light-transmitting filler was cured by the irradiation, and the fluidity was lost, and it adhered closely to the two opposing glass sheets without generating an air interface. When observed with a polarizing microscope and crossed Nicols, liquid crystal droplets of the liquid crystal material were dispersed substantially uniformly over the entire area of the translucent filler, and it was confirmed that polymer particle groups having optical anisotropy had been for...
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