Method for producing antireflection film, antireflection film, and coating composition
a technology of antireflection film and coating composition, which is applied in the direction of synthetic resin layered products, instruments, transportation and packaging, etc., can solve the problems of difficult control of drying step after drying, low production efficiency, and no degree of freedom in the choice of coating solvents, etc., to achieve low reflectance, improve production efficiency, and simplify production steps
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example 1
[0413](Fabrication of Undercoat Layer-Adhered Base Material)
[0414][Preparation of Coating Liquid (Sub-1) for Undercoat Layer]
[0415]The respective components were mixed in the composition shown in Table 3 below, the solid content concentration was adjusted to 40% by mass with a solvent of MEK (methyl ethyl ketone) / MIBK (methyl isobutyl ketone) / cyclohexanone=45 / 45 / 10 (mass ratio), and the mixture was filtered through a filter made from polypropylene having a pore size of 30 μm to prepare a coating liquid for an undercoat layer.
TABLE 3Coating Liquid Sub-1BinderDPCA - 20 / 40 parts by massPolymerizationIRGACURE 184 / 2 parts by massinitiatorSilica solMIBK - ST / 10 parts by mass (in terms of solid content)
[0416]The compounds used above are shown below:[0417]DPCA-20: Partially caprolactone-modified polyfunctional acrylate (manufactured by Nippon Kayaku Co., Ltd.)[0418]Silica sol: MIBK-ST, dispersion at a solid content concentration of 30% with an MIBK solvent, silica fine particles having an a...
example 2
[0484][Preparation of Hollow Silica Particle Dispersion S-5]
[0485]γ-Acryloyloxypropyl trimethoxysilane (a molecular weight as defined herein of 192) (20 parts by mass), 1.51 parts by mass of diisopropoxyaluminum ethyl acetate, and 500 parts by mass of methyl ethyl ketone were added to 500 parts by mass of a hollow silica fine particle sol A (isopropyl alcohol silica sol, average particle diameter 45 nm, silica concentration 20%, and silica particle refractive index 1.30), mixed, and then 3 parts by mass of ion exchange water was added thereto. This mixed liquid was reacted at 60° C. for 4 hours, and then cooled to room temperature, and 1.8 parts by mass of acetylacetone was added thereto to obtain a dispersion. Thereafter, while adding cyclohexanone thereto so as to maintain the content of silica to be substantially constant, solvent replacement was carried out by distillation under reduced pressure at a pressure of 30 Torr, and finally, the concentration was adjusted to obtain a ho...
example 3
[0497](Production of (Meth)Acrylic Resin Film)
[0498]A pellet [a mixture of 90 parts by mass of a (meth)acryl-based resin having a lactone ring structure in which R1 is a hydrogen atom and R2 and R3 are methyl groups in the following general formula (1A) {copolymerization monomer mass ratio=methyl methacrylate / 2-(hydroxymethyl)methyl acrylate=8 / 2, lactone ring formation rate: about 100%, content ratio of the lactone ring structure: 19.4%, weight average molecular weight: 133,000, melt flow rate: 6.5 g / 10 min (240° C., 10 kgf), Tg 131° C.} and 10 parts by mass of an acrylonitrile-styrene (AS) resin {Toyo-AS AS 20, manufactured by Toyo Styrene Co., Ltd. }; Tg 127° C.] was supplied to a biaxial extruder and melt-extruded in a sheet shape at about 280° C. to obtain a (meth)acryl-based resin sheet having a lactone ring structure with a thickness of 110 μm. The unstretched sheet was stretched longitudinally by 2.0 times and laterally by 2.4 times under a temperature condition of 160° C. to...
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