JP3928983B2 - Anti-glare film - Google Patents

Description

◎：強い溌き効果
○：溌き発生
△：判別できず
×：濡れる
【００３５】
また上記の各実施例、および比較例１でそれぞれ得られたアンチグレアフィルムについて、１週間塗膜面を上にして室内に放置した後、ＩＰＡ拭き取り後にＩＰＡを乾燥させ、そのときの拭いた部分と拭いていない部分の境目における、ホコリの付着による汚れの状態を観察し、下記のような結果を得た。
【００３６】
【表２】

【００３７】
また実施例１〜２のアンチグレアフィルムについて、セロハンテープ剥離試験により密着性テストをくり返し行ったところ、保護層の剥離は観察されなかった。
【００３８】
【発明の効果】
以上に説明したように本発明のアンチグレアフィルムは、従来のものと同等のアンチグレア効果を有し、その表面をクリーニングするために布等で拭いても損傷を受けない程度の実用上十分な強度を示すとともに、とくに水やアルコール等を含ませたタオル等で拭いた後でも、ホコリの付着による筋状のシミが残らないという特有の効果を有し、しかもこの効果は多数回の払拭後にも低下しない。[0001]
[Industrial application fields]
The present invention relates to an antiglare film provided on a surface such as a screen of a display device such as a CRT or a liquid crystal display device for the purpose of preventing reflection on the surface, and a composition for forming the antiglare film.
[0002]
[Prior art]
Display devices such as CRTs or liquid crystal display devices are widely used as display devices such as television receivers, personal computers, and word processors. Such a display device is often subjected to anti-glare processing in order to prevent external light from being reflected on the display screen and making the display difficult to see.
[0003]
Conventionally applied anti-glare treatment is generally performed by bringing a thin film or coating having fine irregularities into close contact with the surface. For example, Japanese Patent Application Laid-Open No. 63-172101 discloses that a hard coat layer containing 3 to 30% by weight of silica particles having an average particle diameter of 1 to 50 μm is provided on the surface of a CRT filter. JP-A-4-338901 describes a CRT filter in which a terminal silanol organopolysiloxane is coated on the surface of a silica antireflection film.
[0004]
[Problems to be solved by the invention]
As is clear from the description of the above-mentioned document, in the conventional technique, the main component of the antiglare action is formed by projecting a part of the solid particles held by the resin composition as the binder from the surface of the coating. Depends on surface irregularities. For this reason, there exists a fault that an anti-glare process surface tends to attach dust.
[0005]
In order to eliminate this defect, it is conceivable to contain a fluorosurfactant or a fluororesin in the antiglare film. However, those using a fluorosurfactant have a problem in sustaining effects because they are gradually washed away when wiping with a solvent to clean the surface. Further, when a fluorine-based resin is contained, it is difficult to select a high-hardness resin, and a satisfactory one in terms of hardness cannot be obtained.
[0006]
In either case, when wiping with a cloth moistened with water or alcohol to wipe off dust or hand grease on the surface, dust adheres in the process of water or alcohol remaining on the surface drying. This remains as black dirt or spots.
[0007]
An object of the present invention is to provide an antiglare film having a sufficient hardness and stain resistance, and a composition for the antiglare film, which eliminates the drawbacks of conventional antiglare films.
[0008]
[Means for Solving the Problems]
According to the present invention, an antiglare comprising a resin base material, an extender pigment dispersed in the resin base material, and both a block polymer containing a fluorine atom and a block polymer containing a silicon atom A film is provided.
[0009]
When a block polymer containing fluorine atoms is contained, an antiglare film exhibiting excellent water repellency and particularly strong oil repellency is obtained. When a block polymer containing silicon atoms is contained, excellent oil repellency is obtained. And an antiglare film exhibiting particularly strong water repellency. Furthermore, when both a block polymer containing a fluorine atom and a block polymer containing a silicon atom are contained, an antiglare film having particularly excellent water repellency and oil repellency can be obtained.
[0010]
Further, the anti-glare film of the present invention has a practically sufficient strength not to be damaged even if it is wiped with a cloth or the like for cleaning the surface, and is particularly wiped with a towel or the like containing water or alcohol. Even after this, there is a unique effect that no streak stain remains, and this effect does not decrease even after many wipings.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The antiglare film of the present invention is obtained by dissolving and dispersing a composition containing the above-described components in a suitable organic solvent to form a coating material, such as a surface of a display device such as a CRT or a liquid crystal display device. It is formed by applying and drying for the purpose of preventing reflection on a smooth surface. Or it can also be set as a single-piece | unit film by pouring on the surface which has sufficient peelability with respect to said coating material, and peeling after drying.
[0012]
In a preferred embodiment of the present invention, the block polymer is represented by the following general formula [1].
[0013]
(A)-(B)
(Here, A is a segment containing at least one fluorine atom or silicon atom, and B is a segment showing compatibility with other resins)
[0014]
In the block polymer represented by the general formula [1], a segment containing a fluorine atom or a silicon atom represented by A exhibits surface migration properties, and a segment represented by B exhibits compatibility with other resins. The anti-glare film of the present invention exhibits excellent water repellency and oil repellency, and the effect lasts even after wiping with a towel containing water, alcohol, etc. There will be no streak spots afterwards.
[0015]
The general formula [1] A a strong indication block polymer was segment containing a fluorine atom, and also A a water repellency and oil repellency both With both block polymers with segments containing silicon atoms together the In addition, the residue of streak-like spots after wiping with a towel or the like containing water, alcohol, or the like is significantly reduced.
[0016]
As the resin base material, ultraviolet rays or electron beam curable resins can be used.
[0017]
In particular, as the resin base material, it is desirable to have a sufficient hardness while having a sufficient hardness so that cracks do not occur even when subjected to a certain degree of bending. Has three or more hydroxyl groups in the molecule in a urethane polymer of one molecule of trimethylolpropane or one molecule of pentaerythritol and three molecules of alkylene diisocyanate, or a urethane polymer of one molecule of dipentaerythritol and six molecules of alkylene diisocyanate. Examples thereof include a polymer obtained by polymerizing an ester of a polyhydric alcohol and acrylic acid or methacrylic acid having a molecular number one less than the number of hydroxyl groups of the polyhydric alcohol. Specific examples of the ester polymerized with the urethane polymer include pentaerythritol triacrylate, dipentaerythritol pentaacrylate, and 2-hydroxy-1-acryloxy-3-methacrylate. When such a polymer is used, since there are many polymerizable double bonds and three-dimensional crosslinking occurs, sufficient hardness is obtained when UV-cured, and a certain degree of flexibility due to the chain structure in the molecule. Is obtained.
[0018]
Although there is no restriction | limiting in particular in content of the said block polymer, The range of 0.05-5 weight% with respect to the resin base material is especially preferable at solid content.
[0019]
As the extender pigment, those commonly used in the antiglare layer can be applied, but the optimum extender pigment is silica gel, for example, “Sycilia 256”, “Sycilia 430”, “ What is marketed as "Cycilia 436" etc. can be used advantageously. Porous diatomaceous earth powder is also suitable.
[0020]
【Example】
Examples of the present invention and comparative examples are shown below. In Examples and Comparative Examples, “parts” represents parts by weight, and resin and the like are parts by weight as a solid content. In the following, a block polymer in which A in the general formula [1] is a segment containing one or more fluorine atoms is referred to as a fluorine-containing block polymer, and A is a block polymer in which A is a segment containing one or more silicon atoms. Is represented as a silicon-containing block polymer.
[0021]
(Example 1 )
A urethane polymer of 1 molecule of hexamethylene diisocyanate and 1 molecule of trimethylolpropane and a polymer of dipentaerythritol pentaacrylate (15 functions, refractive index 1.51) were prepared. This polymer (referred to as “polymer F15”) was blended with the following components.
[0022]
Polymer F15 100 parts Photopolymerization initiator Darocur 1173 (manufactured by Ciba Geigy) 5 parts Silica gel (average particle size 2.5 μm) 5 parts (Fuji Silysia Chemical Co., Ltd., trade name “Cycilia 436”)
Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts Fluorine atom-containing block polymer 1 part (Nippon Yushi Co., Ltd., trade name "Modiva F820")
Silicon atom-containing block polymer 1 part (Nippon Yushi Co., Ltd., trade name "Modiva FS720")
[0023]
This composition was applied on a substrate of about 80 μm thickness made of triacetyl cellulose with a thickness of about 3 μm using a normal applicator, then dried, and then subjected to ultraviolet rays under the conditions of 160 W / cm and 30 cm / min. Was applied to cure the polymer F15 to form an antiglare film.
[0024]
(Example 2 )
An antiglare film was formed in the same manner as in Example 1 except that the composition was changed as follows.
[0025]
Polymer F15 100 parts Photopolymerization initiator Darocur 1173 (manufactured by Ciba Geigy) 5 parts Silica gel (average particle size 2.5 μm) 5 parts (Fuji Silysia Chemical Co., Ltd., trade name “Cycilia 436”)
Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts Fluorine atom-containing block polymer 0.25 parts (Nippon Yushi Co., Ltd., trade name "Modiva F820" )
0.25 part of silicon atom-containing block polymer (Nippon Yushi Co., Ltd., trade name “Modiva FS720”)
[0026]
(Comparative Example 1)
An antiglare film was formed in the same manner as in Example 1 except that the composition was changed as follows.
[0027]
Polymer F15 100 parts Photopolymerization initiator Darocur 1173 (manufactured by Ciba Geigy) 5 parts Silica gel (average particle size 2.5 μm) 5 parts (Fuji Silysia Chemical Co., Ltd., trade name “Cycilia 436”)
Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts
(Comparative Example 2)
One molecule of urethane polymer of three molecules of hexamethylene diisocyanate and one molecule of trimethylolpropane and a polymer of three molecules of pentaerythritol triacrylate (9 functional, refractive index 1.51) were prepared. This polymer (referred to as “polymer F9”) was blended with the following components.
[0029]
Polymer F9 100 parts Photopolymerization initiator Darocur 1173 (manufactured by Ciba Geigy) 5 parts Silica gel (average particle size 2.5 μm) 5 parts (Fuji Silysia Chemical Co., Ltd., trade name “Cycilia 436”)
Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts
Using this composition, an antiglare film was formed in the same manner as in Example 1.
[0031]
(Comparative Example 3)
In Comparative Example 2, an antiglare film was formed in the same manner except that the composition was changed as follows.
[0032]
Polymer F9 100 parts Photopolymerization initiator Darocur 1173 (manufactured by Ciba Geigy) 5 parts Silica gel (average particle size 2.5 μm) 5 parts (Fuji Silysia Chemical Co., Ltd., trade name “Cycilia 436”)
Isopropyl alcohol 50 parts Methyl ethyl ketone 50 parts Fluorosurfactant 3 parts (manufactured by Sumitomo 3M Co., Ltd., trade name "Floral F430")
[0033]
About the anti-glare film obtained in each of the above Examples and Comparative Examples, the state as it was after film formation, and the evaluation of water repellency and oil repellency after wiping with isopropyl alcohol (IPA) were performed. Is shown in Table 1 below.
[0034]
[ Table 1 ]

◎: Strong whispering effect ○: Whisper occurrence △: Indistinguishable ×: Wet [0035]
In addition, the anti-glare films obtained in each of the above Examples and Comparative Example 1, respectively, were left in the room with the coating surface facing up for one week, and after wiping off the IPA, the IPA was dried. The state of dirt due to the adhesion of dust at the boundary of the unwiped part was observed, and the following results were obtained.
[0036]
[ Table 2 ]

[0037]
Moreover, about the anti-glare film of Examples 1-2, when the adhesiveness test was repeated by the cellophane tape peeling test, peeling of the protective layer was not observed.
[0038]
【The invention's effect】
As described above, the anti-glare film of the present invention has an anti-glare effect equivalent to that of the conventional film, and has a practically sufficient strength that is not damaged even if wiped with a cloth or the like for cleaning the surface. In addition, it has a unique effect that streaks due to dust adherence do not remain even after wiping with a towel soaked with water or alcohol, etc., and this effect also decreases after many wipings do not do.

Claims (4)

Anti-glare film of the resin matrix, the extender pigment dispersed in the resin base material, characterized in that it contains both a block polymer containing a block polymer and a silicon atom containing a fluorine atom. The block polymer has the following general formula [1]
(A) --- (B)
(Here, A is a segment containing at least one fluorine atom or silicon atom, and B is a segment showing compatibility with other resins)
The antiglare film according to claim 1, which is represented by:   The antiglare film according to claim 1 or 2, wherein the resin base material is an ultraviolet ray or an electron beam curable resin.   The antiglare film according to any one of claims 1 to 3, wherein a solid content of the block polymer is 0.05 to 5% by weight with respect to the resin base material.