WO2008018443A1

WO2008018443A1 - Binder resin for near-infrared absorbing film

Info

Publication number: WO2008018443A1
Application number: PCT/JP2007/065416
Authority: WO
Inventors: Syuji Okamoto; Kazuaki Kaga; Fumiaki Kobayashi
Original assignee: Soken Chemical & Engineering Co., Ltd.
Priority date: 2006-08-09
Filing date: 2007-08-07
Publication date: 2008-02-14
Also published as: JP2008038069A

Abstract

Disclosed is a binder resin for near-infrared absorbing films, which has high flexibility and good adhesion under wet heat conditions without suffering from separation or foaming. In addition, this binder resin is able to stably contain a near-infrared absorbing agent. Specifically disclosed is a binder resin for near-infrared absorbing films, which is obtained by copolymerizing the following monomers (A)-(D). (A) 10-30% by mass of lauryl methacrylate and/or 2-ethylhexyl methacrylate (B) 1-10% by mass of methacrylic acid (C) 50-88% by mass of methyl methacrylate (D) 1-30% by mass of a cycloolefin ring-containing monomer The binder resin fornear-infrared absorbing films has a Tg from -10˚C to 70˚C and a weight average molecular weight of 200,000-500,000.

Description

Specification

Binder resin for near infrared absorption film

Technical field

[0001] The present invention relates to a binder resin for a near-infrared absorbing film. More specifically, the present invention is applied to the surface of a device that emits near-infrared rays, such as a plasma display panel, or a near-infrared ray that is affixed to a building glass. The present invention relates to a binder resin for a near-infrared absorbing film used for an infrared absorbing film. Background art

In recent years, plasma display panels and thin televisions using liquid crystal panels are becoming popular. Of these, the plasma display panel is advantageously used for large flat-screen TVs, but this has the problem of emitting near-infrared rays (hereinafter referred to as “NIR”) as unwanted radiation, which is a remote control for TVs. There was a problem of causing malfunction of peripheral equipment.

[0003] In order to effectively shield this NIR and transmit only visible light, a near-infrared absorbing film

(NIR film) is used. This NIR film has the following problems, which can be obtained by uniformly dispersing a NIR absorbent such as a pigment in a matrix resin and coating it on a transparent plastic film.

[0004] That is, when a highly transparent and dye-stable one such as polyester or methacrylic is used as the matrix resin of the NIR film, this is a flexible resin having a high glass transition temperature (Tg). Due to inferiority, cracks have the drawback of causing problems of adhesion (floating, peeling) to the substrate. In addition, since the functional film needs to be multi-layered, there is a problem that an adhesive layer needs to be further laminated.

[0005] On the other hand, a low Tg binder resin that does not require lamination of a highly flexible pressure-sensitive adhesive layer was used, and NIR dye was added to the pressure-sensitive adhesive layer, but the dye stability deteriorated, There was a problem that the near infrared absorption ability was lowered and the resin was colored.

[0006] Recently, several binder resins having good dye durability have been reported. For example, NIR fibres that suppress foaming, cloudiness, and peeling during wet heat with less dye fading As a binder resin for rumu, a copolymer of a (meth) acrylic monomer and an alicyclic structure-containing monomer has been reported (Patent Document 1). However, because the dye concentration in the examples of this document is low and its evaluation temperature is as low as 60 ° C, it is considered that sufficient performance has not been obtained.

[0007] Further, in the examples of Patent Document 2, a (meth) acrylic monomer and an alicyclic structure-containing monomer are copolymerized as a binder resin for NIR film having high dye stability and good substrate adhesion. A blend of MMA homopolymer with the acrylic polymer is described. However, as confirmed by the present inventors, as in Patent Document 1, the stability of the dye and adhesion to the substrate were not sufficient! /.

[0008] Furthermore, a binder resin for an NIR film obtained by copolymerizing 2-ethylhexyl acrylate, methacrylic acid, methyl methacrylate and cyclohexyl methacrylate is also disclosed in Synthesis Example 1 of Patent Document 3. Yes. However, since this product has a small number average molecular weight of 5,800, it is judged that the action of increasing the color fading of the dye that is the NIR absorber contained is weak.

[0009] Furthermore, Patent Document 4 describes lauryl methacrylate, 2-ethylhexyl methacrylate, methacrylic acid, methyl methacrylate, cyclohexyl methacrylate as constituent monomers of the binder resin for NIR film. The rate etc. are illustrated. However, it contains a fluorine-based polymer as an essential component, and if it does not contain a fluorine polymer, problems such as cracking and color change of the coating film may occur. It is shown in Table 2 on page.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-182793

Patent Document 2: JP 2005-239999

Patent Document 3: JP 2002-249721

Patent Document 4: JP-A-2004-115718

Disclosure of the invention

Problems to be solved by the invention

[0011] Therefore, the problem of the present invention is that the adhesiveness is good even in wet heat with high flexibility, and peeling and foaming force S are not generated, and the strength and strength of the NIR absorbent are prevented and stably contained. It is to provide a binder resin for NIR that can be used. Means for solving the problem

[0012] The present inventors have blended various polymers to solve the above-mentioned problems, and have been searching for adhesion and anti-fading action on various NIR absorbing dyes, particularly under wet heat conditions. The (meth) acrylic copolymer obtained by copolymerizing a specific monomer is excellent in adhesion and flexibility, and does not peel or bulge from the substrate even under hot and humid conditions. The present invention was completed by finding that it has excellent anti-fading properties.

That is, the present invention provides the following monomers (A) to (D):

(A) Lauryl and / or 2-ethylhexyl methacrylate

10-30% by mass

(B) Methacrylic acid;! ~ 10% by mass

(C) methyl methacrylate Tari rate 50-88 mass ^_0/0

(D) A binder resin for NIR film having a Tg—10 to 70 ° C. and a weight average molecular weight of 200,000 to 500,000, obtained by copolymerization of 1 to 30% by mass of a cycloolefin ring-containing monomer. The invention's effect

[0014] Since the binder resin for NIR film of the present invention has a low Tg with a specific monomer composition, it has good adhesion even in wet heat, and peels off and foams even though the Tg is relatively low. In addition, the color fading resistance of the dye is also good.

BEST MODE FOR CARRYING OUT THE INVENTION

The binder resin for NIR film of the present invention is obtained by copolymerizing the following monomers (A) to (D) according to a conventional method, Tg—10 to 70 ° C., weight average molecular weight 200,000 ~ 500,000 things

(A) Lauryl and / or 2-ethylhexyl methacrylate

10-30% by mass

(B) Methacrylic acid;! ~ 10% by mass

(C) methyl methacrylate Tari rate 50-88 mass ^_0/0

(D) Cycloolefin ring-containing monomer 1-30% by mass [0016] Among the above monomers, the monomer (A) has an action of lowering Tg of the copolymer and increasing flexibility. As this monomer (A), lauryl metatalylate or 2-ethylhexyl metatalylate may be used alone or in combination. By using these monomers (A), the flexibility of the resulting copolymer can be improved, the adhesion to the substrate can be improved, and the dye can be held stably. A similar effect cannot be obtained by replacing 2-ethyl hexyl methacrylate with 2-ethyl hexyl methacrylate.

[0017] The monomer (B) has a function of enhancing the flexibility of the copolymer and strengthening the adhesion to a film substrate such as PET, and the monomer (C) is a binder. It is the main component of one resin.

[0018] Further, the cycloolefin ring-containing monomer as the monomer (D) functions to increase the polarity of the copolymer and improve the adhesion. Examples of this monomer (D) include dicyclopentanyl methacrylate, cyclohexyl methacrylate, methylcyclohexyl methacrylate, cyclododecyl methacrylate, t-butylcyclohexyl methacrylate, isobutylcyclohexyl methacrylate. Etc.

[0019] Production of the copolymer obtained from the monomer (A) to (D) of the present invention (hereinafter referred to as "the polymer of the present invention") can be carried out by a known method. That is, it is obtained by carrying out polymerization by light or heat after taking the above-mentioned amount of monomers (A) to (D) and, if necessary, other polymerizable components in a reactor. As a polymerization method for obtaining the polymer of the present invention, known polymerization methods such as solution polymerization, suspension polymerization, emulsion polymerization, dispersion polymerization, bulk polymerization and the like are used, and among these, solution polymerization is preferable.

[0020] The reaction initiator used in the above method is a thermal polymerization initiator such as a peroxide-based initiator or an azo-based initiator, an acetophenone-based initiator, or a benzoin ether-based initiator. Photopolymerization initiators such as ketal initiators can be used.

[0021] More specifically, as the thermal polymerization initiator, persulfates such as potassium persulfate and ammonium persulfate, di (2-ethylhexyl) peroxydicarbonate, di (4-tert-butylhexoxyre) per Oxydicarbonate, G s ec Butinoleperoxycarbonate T-butinoleno one-year-old xibenzoate, t-butinoleno one-year-old xine-year-old decanoate, t-one chinoleno-oxypinorate, t-butinolenoxy pineolate, dilauro-renoperoxide, gen otatanyl peroxide, 1,1, 3,3-tetramethylbutylperoxy-2-ethylhexanoate, di (4-methylbenzoyl) peroxide, 1,1-di (t-hexyloxy) cyclohexane, dibenzoylperoxide (BPO), 1,1 bis ( t-butylperoxide) 3,3,5-trimethylcyclohexane, 1,1 bis (t-butyloxy) cyclododecane, t-butylperoxyisobutyrate, t-butylhydroperoxide, di-t-butylhydride peroxide, dicumylper Peroxide initiators such as oxides and hydrogen peroxide; 2,2 'azobisiso Butyronitrile, 2,2 'azobis (4-methoxy 2,4-dimethylvaleronitrile), 2,2' azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-methylbutyronitrile) 1,1-azobis (cyclohexane 1-canoleponitrolinole), 2,2'-azobis (2,4,4 trimethylpentane), dimethyl 2,2'-azobis (2-methylpropionate) 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'azobis [2- (5 methyl-2 imidazoline 2-inole) propane] dihydrochloride, 2,2'-azobis (2-methylpropion) Amidine) disulfate, 2,2'-azobis (N, N 'dimethyleneisobutylamidine), 2,2'-azobis [N- (2-carboxyethyl) 2-methylpropionamidine] hydrate, etc. Zo-based initiators It is.

[0022] Photopolymerization initiators include 4- (2-hydroxyethoxy) phenyl mono (2-hydroxy-2-propyl) ketone, α-hydroxy mono α, -dimethylacetophenone, methoxyacetophenone, 2 1,2-dimethoxy-2-acetophenone initiators such as 2-phenenoreacetophenone; benzoin ether initiators such as benzoin ether and benzoin isopropyl ether; ketal initiators such as benzyldimethyl ketal; bis (2, 6 Dimethybenzoyl) 2,4,4 Trimethylpentylphosphine oxide, halogenated keton, acylphosphenoxide, acylphosphenate, etc.

[0023] In the present invention, it is preferable to use an oil-soluble thermal polymerization initiator, particularly a azo initiator, among the above.

[0024] Furthermore, the polymer of the present invention can be crosslinked as long as the effects of the invention are not impaired.

As the crosslinking method, polyfunctional monomers having two or more unsaturated bonds in one molecule are co-polymerized. And a method in which a monomer having reactivity with a crosslinking agent is copolymerized in a binder resin and a crosslinking agent such as an isocyanate crosslinking agent or an epoxy crosslinking agent is added. Use of a crosslinking agent is not preferable because the flexibility of the resin may be lost or the viscosity of the resin may become too high. Further, since a functional group having reactivity with the crosslinking agent or a reactive group of the crosslinking agent may cause the near-infrared absorbing dye to fade, it is not preferable to use a large amount.

[0025] Further, in the production of the polymer of the present invention, the polymerizable components that can be incorporated into the monomers (A) to (D) as necessary include methyl acrylate, ethyl (meth) acrylate (meth) acrylate. , N-Butyl (meth) acrylate (meth) acrylate, Isobutyl (meth) acrylate, t-Butyl (meth) acrylate, 2-ethyl hexyl acrylate, cyclohexyl (meth) acrylate, heptyl (meth ) Atarylate, Octyl (meth) acrylate, Isooctanol (Meth) acrylate, Nonyl (meth) acrylate, Isononyl (meth) acrylate, Decinole (meth) acrylate, Dodecino rare acrylate, Amino (meth) Alkyl (meta) such as attalylate, n-lauryl acrylate, stearyl (meth) acrylate Atalylate; Alkoxy (meth) acrylate such as methoxyethyl (meth) acrylate, ethoxy ethyl (meth) acrylate, butoxetyl (meth) acrylate, butoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) ate Alkoxyethylene glycol (meth) acrylate, such as acrylate; Monomers containing carboxyl groups such as acrylic acid, β carboxyethyl (meth) acrylate, crotonic acid, itaconic acid, fumaric acid, maleic acid; dimethylaminoethyl (meta ) Monomers containing amino groups such as acrylate and jetylaminoethyl (meth) acrylate; Monomers containing amide groups such as (meth) acrylamide and dimethyl (meth) acrylamide; 2 Hydroxyethyl ( Data) Atari rate, 3-hydroxypropyl (meth) Atari rate, monomers having a 4-hydroxybutyl (meth) hydroxyl Atari rate and the like; acetic vinyl-acrylonitrile, and the like. Of these, alkyl (meth) acrylate and alkoxy (meth) acrylate are used because they have good copolymerizability and compatibility with the monomers (A) to (D) and the stability of the near-infrared absorbing dye. It is preferable.

[0026] Other monomers can be used within a range that does not impair the effects of the present invention, but with respect to 100 parts by weight of monomers (A) to (D), 0 to 10 parts by weight should be used. Is preferred. Na Of the above-mentioned other monomers, the functional group-containing monomer may cause discoloration of the near-infrared absorbing dye, and has poor compatibility with (A) to (D) monomers such as butyl acetate and acrylonitrile. Since the monomer may cause whitening when wet heat, it is preferably used in a proportion of 5 parts by weight or less, more preferably 1 part by weight or less.

[0027] Among the polymers of the present invention obtained by force, the Tg is 1 to 70 ° C, preferably 20 to 70 ° C, and the weight average molecular weight is 200,000 to 500,000, preferably 200,000 to 40. Many can be used as the binder resin for NIR film of the present invention.

[0028] If the Tg of the polymer is less than -10 ° C, the fading of the dye may not be sufficiently suppressed. If it exceeds 70 ° C, flexibility may be lost and cracks may occur. Yes, it is not preferred as a binder resin for NIR film. If the weight average molecular weight is less than 200,000, the adhesion to the substrate may be deteriorated or the workability may be reduced. On the other hand, if the weight average molecular weight exceeds 500,000, the viscosity becomes high and the coating lines are not good. Both are unfavorable as a binder resin for NIR film.

[0029] In order to make Tg within the above range, monomers (B) to (D) having relatively high homopolymer Tg and relatively low Tg of homopolymer! / The binder resin of the present invention, which only needs to be copolymerized so that Tg is −10 to 70 ° C. within the above range of use amount, can be converted into the monomer (A) lauryl metatalylate and / or 2-ethyl. By copolymerizing xyl methacrylate, the dye can be stably held while imparting flexibility and substrate adhesion to the binder resin. In order to make the weight average molecular weight within the above range, the polymerization temperature, the initiator amount, the monomer concentration, etc. may be controlled.

[0030] One of the preferred constitutional examples of the binder resin for NIR film of the present invention obtained as described above is as follows.

[0031] A polymer having the following monomers (a) to (d) copolymerized and having a Tg of about 69 ° C and an Mw of about 220,000.

(a) lauryl methacrylate Tari rate 13 mass ^_0/0

(b) methacrylic acid 1 mass ^_0/0

(c) methyl methacrylate Tari rate 76 mass ^_0/0

(d) Dicyclopentanyl metatalylate 5% by mass

Cyclohexylmetatalylate 5% by mass [0032] The binder resin for an NIR film of the present invention obtained by force is, for example, dissolved or suspended in a suitable organic solvent, mixed with an NIR absorbent, etc., and then applied to a support film. The NIR film can be prepared by coating and drying to remove the organic solvent.

[0033] Examples of the NIR absorber used by mixing with the binder resin of the present invention include NIR absorbing dyes having an absorption maximum wavelength at 800 to 1200 nm, and specifically include phthalocyanine dyes and diimonium dyes. Dithiol metal complex dyes, naphthalocyanine dyes, anthraquinone dyes, and the like. Among them, it is preferable to use a diimonium dye having high near infrared absorption performance and high transmittance in the visible light region. Diinmodium dyes are very easy to cause dye fading, but disperse in the binder of the present invention to suppress fading.

[0034] As the above diimonium dye, it is preferable to use a compound represented by the following formula (I) having a maximum absorption wavelength at 850 to 12001111.

[Chemical 1]

(In the formula, R is the same or different from each other, and represents hydrogen, an alkyl group, an aryl group, an alkoxy group, a hydroxyl group, a phenyl group, or a halogenated alkyl group, X represents an anion, n is a number of 1 or 2) Is)

[0035] In the above formula (I), the alkyl group of R includes a methyl group, an ethyl group, an n propyl group, an iso propyl group, an n butyl group, an iso butyl group, a sec butyl group, a t butyl group, and an n pentyl group. , Iso pentyl group, neo pentyl group, cyclopentyl group, 1,2-dimethylpropyl group, n-hexyl group, cyclohexyl group, 1,3-dimethylbutyl group, 1-i so propylpropyl group, 1,2-dimethylbutyl group, n-heptyl group, 1,4 dimethylenopentyl group, 2 methyl-1 isopropylpropyl group, 1-ethyl-3-methylbutyl group, n-octyl group, 2-ethylhexyl group, 3 methyl 1 iso propyl butynole group, 2-methyl-1-isopropyl group, l-tert-butyl-2-methylpropyl group, n-noel group, 3,5,5-trimethylhexyl group, etc. Chain, branched or cyclic alkyl groups,

[0036] Further, examples of the aryl group of the group R include a phenyl group, a naphthyl group, a tolyl group, a furyl group, a pyridyl group, and the like, and examples of the halogenated alkyl group include a fluorinated alkyl group, an alkyl chloride group, Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, and a butoxy group. Examples of the alkoxyalkyl group include a methoxymethyl group, a methoxyethyl group, an ethoxyethyl group, and a propoxycetyl group. , Butoxychetyl group, 3-methoxypropyl group, 3-ethoxypropyl group, methoxyethoxymethyl group, ethoxyethoxyethyl group, dimethoxymethinole group, diethoxymethylinole group, dimethoxyethynole group, diethoxyethyl group and the like.

[0037] Further, the anion of the group X includes fluorine ion, chlorine ion, bromine ion, iodine ion, perchlorate ion, nitrate ion, benzenesulfonate ion, p-toluenesulfonate ion, methylsulfate ion, Ethyl sulfate ion, propyl sulfate ion, tetrafluoroborate ion, tetraphenylborate ion, hexafluorophosphate ion, benzenesulfate ion, acetate ion, trifluoroacetate ion, propionate acetate ion, benzoate ion, oxalate ion Succinate ion, malonate ion, oleate ion, stearate ion, citrate ion, pentachlorostannate ion, chlorosulfonate ion, fluorosulfonate ion, trifluoromethanesulfonate ion, hexafluoroarsenate ion Hexaful Examples include fluoroantimonate ion, molybdate ion, tungstate ion, titanate ion, zirconate ion, etc. Among them, it is preferable to use halogen-containing anions such as trifluoromethanesulfonate ion! /.

[0038] The support film is not particularly limited, but is polyester, acrylic, cellulose, polyethylene, polypropylene, polyolefin, polychlorinated butyl, polycarbonate, phenol, urethane. Such as plastic film, or these A combination of any two or more types. A polyester film having a good balance between heat resistance and flexibility is preferable, and a polyethylene terephthalate film is more preferable.

[0039] The thickness of the binder resin for NIR film containing the NIR absorbent after coating and drying is preferably about 1 to 100 m in order to maintain high transparency, particularly 10 to 50. 〃M is preferred.

[0040] By selecting a specific monomer composition, the binder resin for NIR film of the present invention has good adhesion even in wet heat, and does not peel off or foam even though Tg is relatively low! /.

[0041] Since this binder resin imparts good fading resistance to the dye, the use of this binder resin prevents the fading of the dye acting as an NIR absorbent, and from the base material particularly in wet heat. It is possible to prepare NIR films with excellent adhesion without peeling or foaming.

Example

[0042] Hereinafter, the present invention will be described in more detail with reference to production examples and examples, but the present invention is not limited thereto.

[0043] Example 1

Preparation of Ninder resin

A reactor equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen inlet pipe was charged with 17 parts by weight of lauryl methacrylate (LMA), 2 parts by weight of methacrylic acid (MAA), 61 parts by weight of methyl methacrylate (MMA), 20 parts by weight of pentanyl methacrylate (HDCPMA) and 60 parts by weight of toluene were charged, and the contents in the flask were heated to 79 ° C. while introducing nitrogen gas into the flask. Next, 0.6 parts by weight of the polymerization initiator dimethyl 2,2′-azobis (2-methylpropionate) was added, and the reaction was carried out for 6.5 hours while maintaining the reaction temperature at 79 to 85 to obtain a polymer having a weight average molecular weight of 210,000 ( Binder resin) was obtained.

[0044] After adding 2 parts by weight of a diimonium dye (CIR-1085, manufactured by Nippon Carlit Co., Ltd.) to 100 parts by weight of the solid content of the obtained polymer to obtain a solid content of 25%, δΟ ^ πιΡ ΕΤ Coat the film to a dry thickness of 10 m, dry at 100 ° C for 5 minutes, NIR An absorption film was obtained.

[0045] Example 2

A binder resin for NIR (hereinafter sometimes referred to as “NIR resin”) was prepared with the composition shown in Table 1 below by the production method according to Example 1. About each obtained resin, the NIR absorption film was produced like Example 1, and the transmittance | permeability, adhesiveness, and coating property were investigated with the following method. The results are shown in Table 2. In the table, Example 1 is also shown.

[0046] NIR resin composition:

[table 1]

Polymer component Chemical properties

Dyeing

(A) component (B) component (c) component (D) component Others, τ

Resin for NIR 1 LMAAAMADCPMA 2 16 8. CCI R-1085 ⁺ force C check (1) (2) (6 1) (2 0) (2)

N 1 R Resin Motto I 2 LMAAAMADCPMA 2 116 8. CCI -1085 ^f

ΠΑR 卜 (1) (2) (6 1) (2 0) ()

Resin for N! R 3 L M A A A M M A D C P M A 2 16 8 ° C C I R-1085 +

(1) (2) (6 1) (2 0) C 2)

NIR Resin 4 Ingredients 1 L M A M A A A D C P M A 2 C C 1 R-1085 + Number A αο (2 3) (2) (6 5) (1 0) (2)

N I R resin 5 To L-shaped M 2

A 8 AMAAMMADCPMACHA 36,69. c CI R-1085 ⁺

(14) (1) (76) C5) (5) (2)

Resin for N 1 R 6 L M is key 5 M A A M M A D C P M A C H M A 2 27 0 ° c C I R- 1085+

(1 1), M (2) (85) (1) C1) (2)

Resin for NIR 7 L A Bisulfate M Di M A A M M A D C P M A 227,000 c C I R-1085 +

(2 4) C 5) (6 1) (1 0) (2)

Resin for N I R 8 E H M A Amount, Ime A

MAAMMADCPMACHMA 25 4 49. c C 1 R-1085 ⁺

(2 5) C part, methane 1) (6 4) (1 0) C 5) (2)

Comparative resin 1 L M A M A A

H MMAD 12 1 ° c CI R-1085 ⁺

(3 7) C 1) (5 2) (1 0) (2) Comparative resin 2 E H M A M A A 0 0 A A. M M A D C P A 2 c C I R-1085 +

(4 3) C 1) (4 6) (10) (2) Comparative resin 3 E H M A M A A series E 卜 D C P M A C H A 3556 9 c C I R-1085 +

(2 9) C 1) (3 0) (4 0) (2) Near, H

Comparative resin 4 L M A M A A M M A D C P M A 2 47 0 c

(1 7) (2 0) (6 1) Red M gilet (2)

Comparative resin 5 M M A One outside A D C P M A C H M A 1 4 1 0 7. c C I R-1085 '

(70) wire, copper (15) (5) (2) Comparative resin 6 M M A M A 2 16 c C I R-1085 +

(70) Absorption, C □ (30) (2) Comparative resin 7 LMAAAMMADC collection H2 PMA 76,68. c CI R-1085 ⁺

(1 7) C 2) (6 1) (2 0) Color M 1 (2) Comparative resin 8 L M A M A A M M A D C P M A 20

Elementary HA data. c CI R-1085 ⁺

(17) (0.5) (6 2.5) (20) (2) Comparative resin 9 E H A M A A A D C P M A, Chini, C H A 2 36 68. c C I R-1085 +

(1 4) C 1) (7 5) (5) C Lulu D day 5 J

Heme C

Kikata P

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Ahalle

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Pirito

Stock M

A

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Herale

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o Mameme Tata Taku Each of the resins in Table 1 was coated on a PET film (thickness 50 m) to a dry thickness of 10 m to prepare an NIR film. First, the transmittance at 100 nm and 430 nm of this NIR film was measured with an UV-visible spectrophotometer UVmini-1240 (Shimadzu Corporation) to obtain the initial transmittance.

[0048] Next, after each NIR film was allowed to stand at 80 ° CX 90% RH for 300 hours, the transmittance of 1100 ηm and 430 nm was again measured using an UV-visible spectrophotometer UV mini-1240 (Shimadzu Corporation). Measured and determined as the transmittance after wet heat.

[0049] <Adhesion>

The adhesion of the resin to the base film was evaluated by the base tape method. First, the resin obtained in Table 1 was applied to an equipment film (03PEEW, manufactured by Teijin Film Co., Ltd.) to a dry thickness of 25 m, and dried at 23 ° C for 24 hours. Next, scratches having a width of 1 mm were made on the resin coating film side in a grid pattern (100 squares), and then the base film side was fixed to the glass plate with double-sided tape. Furthermore, when a commercially available tape (made by Scotch 3M) is adhered to the coating film with a base-like scratch, and the tape is peeled off by 90 ° peeling (pulling in a direction perpendicular to the bonding surface to peel it off) The adhesion was evaluated by peeling off the coating film. The evaluation was performed in four stages: peeling was 0-; less than 15%, 15-35%, 35-65%, and 65% or more.

[0050] Results:

[Table 2] Initial transmittance Permeability after wet heat

1 1 00 nm 430 r im 1 l OO nm 430 nm Removed%

N I R resin 1 2 0 5 8 7. 1 4. 9 9 F 7.4 5 〜 1 5

NIR resin 2 0 9 8 8 4. 3 3. 4 3 7 6. 6 5 to 1 5

N IR resin 3 4 1 6 9 1. 2 5. 1 3 8 7 5 〜 1 5

N IR resin 4 2 6 5 8 8. 9 5. 1 7 7 5. 1 5 to 1 5

NIR resin 5 4 2 7 9 O. 5 7. 2 7 9. 5 5 to 1 5

N IR resin 6 2 8 8 8 7 .5 5. 1 1 7 8. 9 5 〜 1 5

N IR resin 7 3 4 5 8 9. 7 6. 9 2 7 3. 2 5 to 1 5

NIR resin 8 2 2 5 8 6 .6 4 .6 6 7 4. 6 5 to 15 Comparative resin 1 6 1 5 9 2 .3 1 7 .5 7 2 .1 1 5 to 3 5 Comparative resin 2 6 1 6 9 1. 1 1 5. 8 7 1. 1 1 5 〜: 3 5 Comparative resin 3 5 1 7 8 2.5. 5 9. 3 7 1. 3 6 5 or more Comparative resin 4 4 5 7 8 8. 7 1 3. 8 7 7. 3 5 to 1 5 Comparative resin 5 2 0 4 8 5 .6 3. 2 2 7 F 3 1 5 to 3 5 Comparative resin 6 2 7 6 8 7. 4 6. 5 2 7 4 7 1 5 to 3 5 Comparative resin 0 3 0 5 8 8. 4 5. 7 8 7 8 1 5 to 3 5 Comparative resin 8 3 2 2 8 6. 4 5. 9 4 7 5. 6 1 5 to 3 5 Comparative resin 9 1 4 2 8 7.3 3 9 4 1 6 2.5 5 1 5 to 3 5 Industrial applicability [0051] The binder resin for NIR film of the present invention has good flexibility and good adhesion even under wet heat, and does not peel off or foam. Also, the NIR absorbent has a fading resistance to the dye. Is also good.

[0052] Therefore, the NIR film or the like prepared using the binder resin of the present invention has a high utility value as a film for the purpose of shielding NIR including PDP display.

Claims

The scope of the claims

[1] Next monomer (A) to (D)

(A) Lauryl and / or 2-ethylhexyl methacrylate

10-30% by mass

(B) Methacrylic acid;! ~ 10% by mass

(C) methyl methacrylate Tari rate 50-88 mass ^_0/0

(D) A binder resin for a near-infrared absorbing film having a Tg—10 to 70 ° C. and a weight average molecular weight of 200,000 to 500,000 obtained by copolymerizing 1 to 30% by mass of a cycloolefin ring-containing monomer.

[2] Monomer (D) force Dicyclopentanyl metatalylate, cyclohexyl metatalylate, methyl cyclohexyl metatalylate, cyclododecyl metatalylate, t-butyl cyclohexyl metatalylate and isobutyl cyclohexyl 2. The binder resin for a near-infrared absorbing film according to claim 1, wherein the binder resin is one or more monomers selected from metatarylates.