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Fine inorganic oxide dispersion, coating composition, optical film, antireflection film, polarizing plate, and image display device

a technology of inorganic oxide and dispersion, applied in the direction of pigment treatment with organosilicon compounds, pigment treatment, etc., can solve the problems of insufficient stability of the resultant dispersion, insufficient scratch resistance or strength of the cured product, and insufficient storage stability. , to achieve the effect of high scratch resistance, no haze, and high dispersion stability

Inactive Publication Date: 2005-07-14
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] An object of the present invention is to provide a stable, fine dispersion of inorganic oxide particles and a coating composition containing the same.
[0011] Another object of the invention is to provide an optical film, particularly an antireflection film, having improved scratch resistance while maintaining sufficient antireflection performance.
[0030] The inorganic oxide dispersion according to the present invention has high dispersion stability. A coating composition containing the inorganic oxide dispersion and a film forming composition provides an optical film with no haze and high scratch resistance. The optical film of the present invention, especially a display using the antireflective film exhibit excellent visibility with little reflection of ambient light or objects on the viewer's side.

Problems solved by technology

The technique is insufficient in terms of stability of a resultant dispersion, nevertheless.
However, the reaction between the polyalkoxypolysiloxane and the polymerizable silane coupling agent hardly proceeds sufficiently for achieving a high ratio of introducing the polymerizable group so that the resulting cured product is not satisfactory in scratch resistance or strength.
JP-A-940909 proposes use of a partial co-hydrolysis-condensation product of an alkoxysilane having an organic functional group and a tetraalkoxysilane, but the coating composition containing the same has insufficient storage stability, still leaving room for further improvement.
It has therefore been a difficult problem to satisfy both the requirements for low refractive index and high scratch resistance.
The technique is effective to some extent in improving scratch resistance but is still insufficient for improving scratch resistance of a coating film that essentially lacks film strength and interfacial adhesion.
However, because a silane coupling agent having a low boiling point vaporizes while being applied and dried, it must be added in an excess corresponding to the evaporation loss, which makes it difficult to obtain stable performance.

Method used

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  • Fine inorganic oxide dispersion, coating composition, optical film, antireflection film, polarizing plate, and image display device
  • Fine inorganic oxide dispersion, coating composition, optical film, antireflection film, polarizing plate, and image display device
  • Fine inorganic oxide dispersion, coating composition, optical film, antireflection film, polarizing plate, and image display device

Examples

Experimental program
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Effect test

example 1

Stabilization of Inorganic Oxide Particles

1) Preparation of Dispersion A-1

[0197] Thirty parts of acryloyloxypropyltrimethoxysilane (M-1) and 1.5 parts of di(isopropoxy)(ethyl acetoacetato)aluminum were mixed into 333 parts of silica sol IPA-ST-L (silica sol in isopropyl alcohol, available from Nissan Chemical Industries, Ltd.; average particle size: 45 nm; silica concentration: 30%), and 9 parts of ion exchanged water was added thereto. The mixture was allowed to react at 60° C. for 8 hours, followed by cooling to room temperature. To the mixture was added 1.8 parts of acetylacetone to give dispersion A-1.

2) Preparation of Dispersion B-1

[0198] The same procedure as in (1) above was repeated, except for replacing IPA-ST-L with Methanol Silica Sol (silica sol in methanol, available from Nissan Chemical; average particle size: 12 nm; silica concentration: 30%) to obtain dispersion B-1.

3) Preparation of Dispersion C-1

[0199] The same procedure as in (1) above was repeated, excep...

example 2

1) Preparation of Dispersion A2-1 by solvent replacement

[0211] Five hundred grams of dispersion A-1 of Example 1 was subjected to solvent replacement by distillation under a reduced pressure of 150 Torr while adding methyl isobutyl ketone to the dispersion at such a feed rate as to maintain the silica content of the dispersion constant. The residual isopropyl alcohol in the resulting dispersion (designated dispersion A2-1) was found to be 1.0% or less by gas chromatography. No foreign matter was observed. When diluted with methyl isobutyl ketone to a solid content of 30%, the dispersion had a viscosity of 3 mPa·s at 25° C.

2) Preparation of Dispersion B2-2 by Solvent Replacement

[0212] Five hundred grams of dispersion B-2 of Example 1 was subjected to solvent replacement by distillation under a reduced pressure of 150 Torr while adding methyl ethyl ketone to the dispersion at such a feed rate as to maintain the silica content of the dispersion constant. The residual methanol in t...

example 3

[0214] 1) Preparation of Coating Composition for Hard Coat Layer

Trimethylolpropane triacetate (Viscoat750.0parts#295, from Nippon Kayaku Co., Ltd.)Polyglycidyl methacrylate (weight270.0partsaverage molecular weight: 15000)Methyl ethyl ketone730.0partsCyclohexanone500.0partsPhoto polymerization initiator50.0parts(Irgacure 184, from Ciba-Geigy Japan Ltd.)

[0215] The above components were agitated in a mixing tank and filtered through a polypropylene filter having an opening size of 0.4 μm to give a coating composition for hard coat layer.

2) Preparation of Fine Titanium Dioxide Dispersion

[0216] MPT-129C, fine particles of cobalt-containing titanium dioxide particles having been surface treated with aluminum hydroxide and zirconium hydroxide, available from Ishihara Sangyo Kaisha, Ltd., was used. The particles had a TiO2:Co3O4:Al2O3:ZrO2 ratio of 90.5:3.0:4.0:0.5 by weight.

[0217] The titanium dioxide particles (257.1 parts) were dispersed in 701.8 parts of cyclohexanone using 41.1 ...

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Abstract

An inorganic oxide dispersion containing an organic solvent, and inorganic oxide particles surface-treated with at least one of a hydrolyzate and a partial condensate of an organosilane compound represented by formula (I), the inorganic oxide particles being dispersed in the organic solvent: (R10)m—Si(X)4−m (I) as defined herein, the surface treatment of the inorganic oxide particles being carried out in a presence of at least one of: (a) an acid catalyst; and (b) a metal chelate compound having Zr, Ti or Al as a center metal and at least one of an alcohol represented by formula: R3OH in which R3 represents an allyl group having 1 to 10 carbon atoms, and a compound represented by formula: R4COCH2COR5 as defined herein, as a ligand.

Description

FIELD OF THE INVENTION [0001] This invention relates to a fine inorganic oxide dispersion having fine inorganic oxide particles dispersed stably and a coating composition containing the same. The invention further relates to an optical film, particularly an antireflection film, formed of the coating composition. The invention still further relates to an optical film, particularly a polarizing plate and an image display device having an antireflection film. BACKGROUND OF THE INVENTION [0002] Compounding organic or inorganic materials into adhesives, exterior coatings, hard coats, antireflection coatings, and the like has been studied to improve scratch resistance and strength after cure, adhesion to substrates, and the like. [0003] In mixing an organic material and an inorganic material, it is necessary to prevent undesired agglomeration of the inorganic material. One of the methods generally followed is to disperse an inorganic material in a solvent compatible with an organic materi...

Claims

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Application Information

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IPC IPC(8): C08K9/06C09C1/30C09C1/36C09C3/12
CPCC08K9/06C09C1/3054C09C1/3081C09C3/12C09C1/3661C09C1/3684C09C1/3692C09C1/309C01P2004/84
Inventor YONEYAMA, HIROYUKI
Owner FUJIFILM CORP
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