JP5685796B2 - Molded laminated film - Google Patents
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- JP5685796B2 JP5685796B2 JP2011194532A JP2011194532A JP5685796B2 JP 5685796 B2 JP5685796 B2 JP 5685796B2 JP 2011194532 A JP2011194532 A JP 2011194532A JP 2011194532 A JP2011194532 A JP 2011194532A JP 5685796 B2 JP5685796 B2 JP 5685796B2
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- curable resin
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- laminated film
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- 229920005989 resin Polymers 0.000 claims description 95
- 239000011347 resin Substances 0.000 claims description 95
- 238000000465 moulding Methods 0.000 claims description 38
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 32
- 230000005540 biological transmission Effects 0.000 claims description 20
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 10
- 125000003545 alkoxy group Chemical group 0.000 claims description 10
- 125000004453 alkoxycarbonyl group Chemical group 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- 125000003710 aryl alkyl group Chemical group 0.000 claims description 9
- 125000003118 aryl group Chemical group 0.000 claims description 9
- 125000004104 aryloxy group Chemical group 0.000 claims description 9
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 9
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 6
- 125000005843 halogen group Chemical group 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims 1
- 238000001228 spectrum Methods 0.000 claims 1
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- 238000000411 transmission spectrum Methods 0.000 description 35
- -1 polyethylene terephthalate Polymers 0.000 description 22
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- 239000012298 atmosphere Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 3
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- 229920000298 Cellophane Polymers 0.000 description 3
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- TZKJUHADYYNZCG-UHFFFAOYSA-N 2,4-bis(2,4-dimethylphenyl)-6-phenyl-1,3,5-triazine Chemical compound C1(=CC=CC=C1)C1=NC(=NC(=N1)C1=C(C=C(C=C1)C)C)C1=C(C=C(C=C1)C)C TZKJUHADYYNZCG-UHFFFAOYSA-N 0.000 description 2
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- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
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- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 1
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- BTJPUDCSZVCXFQ-UHFFFAOYSA-N 2,4-diethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC(CC)=C3SC2=C1 BTJPUDCSZVCXFQ-UHFFFAOYSA-N 0.000 description 1
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical compound C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 description 1
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- PJGAWUSSHHLRRD-UHFFFAOYSA-N 2-[4-(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-octoxyphenol Chemical compound CCCCCCCCOc1ccc(c(O)c1)-c1ncnc(n1)-c1ccc(C)cc1C PJGAWUSSHHLRRD-UHFFFAOYSA-N 0.000 description 1
- HHIVRACNDKRDTF-UHFFFAOYSA-N 2-[4-(2,4-dimethylphenyl)-6-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazin-2-yl]-5-propoxyphenol Chemical compound OC1=CC(OCCC)=CC=C1C1=NC(C=2C(=CC(C)=CC=2)C)=NC(C=2C(=CC(OCCC)=CC=2)O)=N1 HHIVRACNDKRDTF-UHFFFAOYSA-N 0.000 description 1
- JLCTUGNTSLBAND-UHFFFAOYSA-N 2-[4-(2-hydroxy-4-octoxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazin-2-yl]-5-octoxyphenol Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C1=NC(C=2C=CC(OC)=CC=2)=NC(C=2C(=CC(OCCCCCCCC)=CC=2)O)=N1 JLCTUGNTSLBAND-UHFFFAOYSA-N 0.000 description 1
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 1
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- WVRHNZGZWMKMNE-UHFFFAOYSA-N 2-hydroxy-1-[2-(2-methylpropyl)phenyl]-2-phenylethanone Chemical compound CC(C)CC1=CC=CC=C1C(=O)C(O)C1=CC=CC=C1 WVRHNZGZWMKMNE-UHFFFAOYSA-N 0.000 description 1
- PCKZAVNWRLEHIP-UHFFFAOYSA-N 2-hydroxy-1-[4-[[4-(2-hydroxy-2-methylpropanoyl)phenyl]methyl]phenyl]-2-methylpropan-1-one Chemical compound C1=CC(C(=O)C(C)(O)C)=CC=C1CC1=CC=C(C(=O)C(C)(C)O)C=C1 PCKZAVNWRLEHIP-UHFFFAOYSA-N 0.000 description 1
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 1
- NACPTFCBIGBTSJ-UHFFFAOYSA-N 2-hydroxy-2-phenyl-1-(2-propan-2-ylphenyl)ethanone Chemical compound CC(C)C1=CC=CC=C1C(=O)C(O)C1=CC=CC=C1 NACPTFCBIGBTSJ-UHFFFAOYSA-N 0.000 description 1
- LWRBVKNFOYUCNP-UHFFFAOYSA-N 2-methyl-1-(4-methylsulfanylphenyl)-2-morpholin-4-ylpropan-1-one Chemical compound C1=CC(SC)=CC=C1C(=O)C(C)(C)N1CCOCC1 LWRBVKNFOYUCNP-UHFFFAOYSA-N 0.000 description 1
- KTALPKYXQZGAEG-UHFFFAOYSA-N 2-propan-2-ylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C(C)C)=CC=C3SC2=C1 KTALPKYXQZGAEG-UHFFFAOYSA-N 0.000 description 1
- YDIYEOMDOWUDTJ-UHFFFAOYSA-N 4-(dimethylamino)benzoic acid Chemical compound CN(C)C1=CC=C(C(O)=O)C=C1 YDIYEOMDOWUDTJ-UHFFFAOYSA-N 0.000 description 1
- JLUNJUVGBLZKPE-UHFFFAOYSA-N 4-[4-(2,4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazin-2-yl]benzene-1,3-diol Chemical compound C1=CC(OC)=CC=C1C1=NC(C=2C(=CC(O)=CC=2)O)=NC(C=2C(=CC(O)=CC=2)O)=N1 JLUNJUVGBLZKPE-UHFFFAOYSA-N 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- QKAWESMDPBUGLG-UHFFFAOYSA-N OC1=NC=NC(=N1)C1=C(C=CC=C1)OC(C(C(=O)OCC)(C(=O)OCC)C(=O)OCC)OC Chemical compound OC1=NC=NC(=N1)C1=C(C=CC=C1)OC(C(C(=O)OCC)(C(=O)OCC)C(=O)OCC)OC QKAWESMDPBUGLG-UHFFFAOYSA-N 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- YPCHGLDQZXOZFW-UHFFFAOYSA-N [2-[[4-methyl-3-[[3-prop-2-enoyloxy-2,2-bis(prop-2-enoyloxymethyl)propoxy]carbonylamino]phenyl]carbamoyloxymethyl]-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound CC1=CC=C(NC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C)C=C1NC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C YPCHGLDQZXOZFW-UHFFFAOYSA-N 0.000 description 1
- FGKPTVBGNVBIRE-UHFFFAOYSA-N [4-[4-(4-butanoyloxy-2-hydroxyphenyl)-6-[2,4-di(butanoyloxy)phenyl]-1,3,5-triazin-2-yl]-3-hydroxyphenyl] butanoate Chemical compound OC1=C(C=CC(=C1)OC(CCC)=O)C1=NC(=NC(=N1)C1=C(C=C(C=C1)OC(CCC)=O)O)C1=C(C=C(C=C1)OC(CCC)=O)OC(CCC)=O FGKPTVBGNVBIRE-UHFFFAOYSA-N 0.000 description 1
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
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- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
- 150000001718 carbodiimides Chemical class 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
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Images
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- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
本発明は、基材フィルム上にクラック伸度が10%以上の紫外線硬化性樹脂層を有する成型用積層フィルムに関する。詳しくはインモールド成型等の成型加工時における変形に追随可能な成型性を有する紫外線硬化性樹脂層が基材フィルム上に積層された成型用積層フィルムに関する。更に詳しくは、基材フィルムと紫外線硬化性樹脂層との初期密着力と紫外線暴露後の密着力が改良された成型用積層フィルムに関する。 The present invention relates to a laminated film for molding having an ultraviolet curable resin layer having a crack elongation of 10% or more on a base film. More specifically, the present invention relates to a laminated film for molding in which an ultraviolet curable resin layer having moldability capable of following deformation during molding processing such as in-mold molding is laminated on a base film. More specifically, the present invention relates to a laminated film for molding having improved initial adhesion between the base film and the ultraviolet curable resin layer and adhesion after exposure to ultraviolet rays.
携帯型パーソナルコンピュータ、モバイル機器、携帯電話、電子手帳等の電子機器筐体の保護や加飾のために、成型用積層フィルムの使用によるインモールド成型法が広く用いられるようになってきている。成型用積層フィルムには、成形加工時における変形に追随できるようにクラックが発生せずにある程度伸びる特性が要求されている(特許文献1、2)。 An in-mold molding method using a laminated film for molding has been widely used for protecting and decorating electronic device casings such as portable personal computers, mobile devices, mobile phones, and electronic notebooks. The laminated film for molding is required to have a property of extending to some extent without generating cracks so that it can follow deformation during molding (Patent Documents 1 and 2).
上述したような電子機器等の筐体等に適用される成型用積層フィルムは、屋外や強い蛍光灯の光の環境下において使用されるため、紫外線に曝されることが多くなる。そのため長期間紫外線に曝されると、成型用積層フィルムを構成する基材フィルムと樹脂層との密着力が低下して、樹脂層が剥がれ易くなると言う問題点があった。 Since the laminated film for molding applied to a housing or the like of an electronic device as described above is used outdoors or in a strong fluorescent light environment, it is often exposed to ultraviolet rays. For this reason, when exposed to ultraviolet rays for a long period of time, there is a problem that the adhesion between the base film and the resin layer constituting the laminated film for molding is reduced, and the resin layer is easily peeled off.
一方、長期間の紫外線暴露による成型用積層フィルムの耐候性を向上させるために、成型用積層フィルムを構成する基材フィルムや樹脂層に紫外線吸収剤を含有させることが知られている(特許文献3、4)。 On the other hand, in order to improve the weather resistance of the laminated film for molding due to long-term exposure to ultraviolet rays, it is known to contain an ultraviolet absorber in the base film or resin layer constituting the laminated film for molding (Patent Document) 3, 4).
しかしながら、紫外線暴露後の基材フィルムと樹脂層との密着力を向上させるために、あるいは特許文献4に開示されているように積層フィルムの耐候性を改良するために、樹脂層に紫外線吸収剤を含有させると、初期密着力が低下してしまう。特に、この問題は、樹脂層が成型加工性を有する場合(樹脂層がクラックを発生せずに10%以上伸びる機能(クラック伸度が10%以上)を有する場合)に起こりやすく、成型用積層フィルムにおいて重大な問題となる。 However, in order to improve the adhesion between the base film and the resin layer after exposure to ultraviolet rays, or to improve the weather resistance of the laminated film as disclosed in Patent Document 4, the ultraviolet absorber is added to the resin layer. If it is contained, the initial adhesion is reduced. In particular, this problem is likely to occur when the resin layer has moldability (when the resin layer has a function of extending 10% or more without generating cracks (crack elongation is 10% or more)), and the laminate for molding. It becomes a serious problem in film.
従って、本発明の目的は、上記従来技術の問題に鑑み、成型加工適性を有し、かつ初期密着力と紫外線暴露後の密着力が共に改良された成型用積層フィルムを提供することにある。 Accordingly, an object of the present invention is to provide a laminated film for molding that is suitable for molding and has improved initial adhesion and adhesion after exposure to ultraviolet rays, in view of the above-mentioned problems of the prior art.
本発明の上記目的は、以下の発明によって基本的に達成された。
1)基材フィルム上にクラック伸度が10%以上の紫外線硬化性樹脂層を有する成型用積層フィルムであって、前記紫外線硬化性樹脂層が紫外線吸収剤を含有し、かつ紫外線硬化性樹脂層の透過スペクトルにおいて320〜350nmの波長域に透過率が5%以上の透過ピークを有することを特徴とする、成型用積層フィルム。
2)前記透過ピークの透過率が5%以上40%以下である、前記1)の成型用積層フィルム。
3)前記透過ピークを320〜340nmの波長域に有する、前記1)または2)の成型用積層フィルム。
4)前記紫外線吸収剤がトリアジン系紫外線吸収剤である、前記1)〜3)のいずれかの成型用積層フィルム。
5)前記トリアジン系紫外線吸収剤が一般式1で表される化合物である、前記4)のいずれかの成型用積層フィルム。
The above object of the present invention has been basically achieved by the following invention.
1) A laminated film for molding having an ultraviolet curable resin layer having a crack elongation of 10% or more on a base film, wherein the ultraviolet curable resin layer contains an ultraviolet absorber, and the ultraviolet curable resin layer A laminated film for molding having a transmission peak of 5% or more in a wavelength region of 320 to 350 nm in the transmission spectrum of.
2) The laminated film for molding according to 1), wherein the transmittance of the transmission peak is 5% or more and 40% or less.
3) The laminated film for molding according to 1) or 2) having the transmission peak in a wavelength region of 320 to 340 nm.
4) The laminated film for molding according to any one of 1) to 3), wherein the ultraviolet absorber is a triazine-based ultraviolet absorber.
5) The laminated film for molding according to any one of 4), wherein the triazine-based ultraviolet absorber is a compound represented by Formula 1.
式中、R1〜R7はそれぞれ独立的に、水素原子、ハロゲン原子、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表す。
6)前記トリアジン系紫外線吸収剤が一般式2で表される化合物である、前記4)または5)の成型用積層フィルム。
In the formula, R 1 to R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group, or an aralkyl group.
6) The laminated film for molding according to 4) or 5), wherein the triazine-based ultraviolet absorber is a compound represented by the general formula 2.
式中、R1、R4、R6はそれぞれ独立的に、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表し、R2、R3、R5、R7はそれぞれ独立的に、水素原子、ハロゲン原子、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表す。 In the formula, each of R 1 , R 4 and R 6 independently represents a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group, or an aralkyl group, and R 2 , R 3 , R 5 and R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group or an aralkyl group.
本発明によれば、成型加工適性を有し、かつ、初期密着力と紫外線暴露後の密着力が共に改良された成型用積層フィルムを提供することができる。 According to the present invention, it is possible to provide a laminated film for molding that is suitable for molding and has improved both initial adhesion and adhesion after exposure to ultraviolet rays.
本発明の成型用積層フィルム(以下、積層フィルムと略記する)は、基材フィルム上にクラック伸度が10%以上の紫外線硬化性樹脂層を有する。ここで、クラック伸度とは、積層フィルムの片側を固定して引張速度50mm/minで積層フィルムを引っ張ったときに、紫外線硬化性樹脂層にクラックが発生するときの伸び率である。 The laminated film for molding of the present invention (hereinafter abbreviated as a laminated film) has an ultraviolet curable resin layer having a crack elongation of 10% or more on a base film. Here, the crack elongation is the elongation when a crack is generated in the ultraviolet curable resin layer when one side of the laminated film is fixed and the laminated film is pulled at a tensile speed of 50 mm / min.
従来から一般的に知られているハードコートフィルムは、ハードコート層の硬度が高く設定されているためクラック伸度は小さく(通常5%以下)、成型用には通常用いられない。
本発明の紫外線硬化性樹脂層はクラック伸度が10%以上であるので、成型加工適性を有する。本発明の紫外線硬化性樹脂層のクラック伸度は、15%以上が好ましく、20%以上がより好ましく、特に25%以上が好ましい。上限は250%以下が好ましく、200%以下がより好ましく、特に150%以下が好ましい。
Conventionally known hard coat films are generally not used for molding because the hardness of the hard coat layer is set high so that the crack elongation is small (usually 5% or less).
Since the ultraviolet curable resin layer of the present invention has a crack elongation of 10% or more, it has moldability. The crack elongation of the ultraviolet curable resin layer of the present invention is preferably 15% or more, more preferably 20% or more, and particularly preferably 25% or more. The upper limit is preferably 250% or less, more preferably 200% or less, and particularly preferably 150% or less.
紫外線硬化性樹脂層のクラック伸度が10%未満であると成型加工性が劣り、一方、クラック伸度が250%以上となると紫外線硬化性樹脂層の硬度が不足して傷が入りやすくなる。 When the crack elongation of the ultraviolet curable resin layer is less than 10%, the molding processability is inferior. On the other hand, when the crack elongation is 250% or more, the ultraviolet curable resin layer has insufficient hardness and is easily damaged.
[紫外線硬化性樹脂層]
本発明における紫外線硬化性樹脂層は、紫外線吸収剤を含有し、かつ紫外線硬化性樹脂層の透過スペクトルにおいて320〜350nmの波長域に透過率が5%以上の透過ピークを有する。
[UV curable resin layer]
The ultraviolet curable resin layer in the present invention contains an ultraviolet absorber and has a transmission peak with a transmittance of 5% or more in the wavelength region of 320 to 350 nm in the transmission spectrum of the ultraviolet curable resin layer.
本発明における紫外線硬化性樹脂層の透過スペクトルは、ポリエチレンテレフタレートフィルム上に紫外線硬化性樹脂層が積層された状態で測定された透過スペクトルである。 The transmission spectrum of the ultraviolet curable resin layer in the present invention is a transmission spectrum measured in a state where the ultraviolet curable resin layer is laminated on the polyethylene terephthalate film.
一般的なポリエチレンテレフタレートフィルムは、400〜320nmの紫外線領域には、紫外線硬化性樹脂層の透過スペクトルに実質的に影響与えるような吸収を有しないので、本発明では上記の測定法で得られた透過スペクトルを紫外線硬化性樹脂層の透過スペクトルとする。 Since a general polyethylene terephthalate film does not have an absorption that substantially affects the transmission spectrum of the ultraviolet curable resin layer in the ultraviolet region of 400 to 320 nm, it was obtained by the above measurement method in the present invention. The transmission spectrum is the transmission spectrum of the ultraviolet curable resin layer.
本発明における紫外線硬化性樹脂層の特徴的な透過スペクトルについて、図1を参照して説明する。図1は、本発明の積層フィルムにおける紫外線硬化性樹脂層の透過スペクトルの一例を示す。 A characteristic transmission spectrum of the ultraviolet curable resin layer in the present invention will be described with reference to FIG. FIG. 1 shows an example of a transmission spectrum of an ultraviolet curable resin layer in the laminated film of the present invention.
紫外線硬化性樹脂層に紫外線吸収剤を含有させることによって、400nm以下の紫外線領域の透過率が急激に大きく低下する。そして、本発明の透過スペクトルの特徴は、320〜350nmの波長域に透過率が5%以上の透過ピーク(符号1)を有する。 By including an ultraviolet absorber in the ultraviolet curable resin layer, the transmittance in the ultraviolet region of 400 nm or less is drastically reduced. And the characteristic of the transmission spectrum of this invention has the transmission peak (code | symbol 1) whose transmittance | permeability is 5% or more in the wavelength range of 320-350 nm.
本発明において、320〜350nmの波長域に透過率が5%以上の透過ピークを有するとは、透過ピークの波長から370nmの波長域に、透過ピークの透過率より1%以上小さい透過率の領域(ボトム;符号2)を有することを意味する。 In the present invention, having a transmission peak with a transmittance of 5% or more in the wavelength region of 320 to 350 nm means that the transmittance is 1% or more smaller than the transmittance of the transmission peak in the wavelength region of 370 nm from the wavelength of the transmission peak. (Bottom; code 2).
紫外線硬化性樹脂層に紫外線吸収剤を含有させることによって紫外線暴露後の密着力が向上し、更に紫外線硬化性樹脂層に上記したような本発明の特徴的な透過スペクトルを付与することによって初期密着力が向上する。
一般的には、紫外線硬化性樹脂層の紫外線照射による硬化反応は、紫外線硬化性樹脂層に紫外線吸収剤を含有させることにより低下する。しかしながら、上記した本発明の特徴的な透過スペクトルを付与することにより硬化反応の低下が抑制され、その結果、十分な初期密着力が確保できると推測される。
Inclusion of an ultraviolet absorber in the ultraviolet curable resin layer improves adhesion after exposure to ultraviolet rays, and initial adhesion by imparting the characteristic transmission spectrum of the present invention to the ultraviolet curable resin layer as described above. Power is improved.
In general, the curing reaction of an ultraviolet curable resin layer by irradiation with ultraviolet rays is reduced by containing an ultraviolet absorber in the ultraviolet curable resin layer. However, it is presumed that a sufficient initial adhesion can be secured as a result of imparting the above-described characteristic transmission spectrum of the present invention to suppress a decrease in the curing reaction.
本発明の紫外線硬化性樹脂層における透過スペクトルにおいて、透過ピークは320〜340nmの波長域に存在することが好ましく、特に325〜335nmの波長域に存在することが好ましい。 In the transmission spectrum of the ultraviolet curable resin layer of the present invention, the transmission peak is preferably in the wavelength region of 320 to 340 nm, and particularly preferably in the wavelength region of 325 to 335 nm.
透過ピークの透過率は、7%以上がより好ましく、8%以上がより好ましく、更に9%以上が好ましく、特に10%以上が好ましい。透過ピークの上限の透過率は40%以下が好ましく、30%以下がより好ましい。透過ピークの透過率が40%を越えると、紫外線暴露後の密着力が低下する場合がある。 The transmittance of the transmission peak is more preferably 7% or more, more preferably 8% or more, further preferably 9% or more, and particularly preferably 10% or more. The transmittance at the upper limit of the transmission peak is preferably 40% or less, and more preferably 30% or less. When the transmittance of the transmission peak exceeds 40%, the adhesion after exposure to ultraviolet rays may be reduced.
本発明の紫外線硬化性樹脂層における透過スペクトルにおいて、透過ピークとボトムの透過率差は2%以上が好ましく、3%以上がより好ましく、特に4%以上が好ましい。上記差の上限は15%以下が好ましく、10%以下が好ましい。 In the transmission spectrum in the ultraviolet curable resin layer of the present invention, the transmittance difference between the transmission peak and the bottom is preferably 2% or more, more preferably 3% or more, and particularly preferably 4% or more. The upper limit of the difference is preferably 15% or less, and more preferably 10% or less.
紫外線硬化性樹脂層に前述した本発明の特徴的な透過スペクトルを付与するには、紫外線吸収剤の種類と添加量を選択する必要がある。紫外線吸収剤として従来から一般的に知られているベンゾトリアゾール系紫外線吸収剤やベンゾフェノン系紫外線吸収剤では、本発明の特徴的な透過スペクトルは得られにくい。一方、トリアジン系紫外線吸収剤の中に本発明の特徴的な透過スペクトルを付与するものがあることが分かった。 In order to impart the above-described characteristic transmission spectrum of the present invention to the ultraviolet curable resin layer, it is necessary to select the type and addition amount of the ultraviolet absorber. With the benzotriazole-based UV absorbers and benzophenone-based UV absorbers that are conventionally known as UV absorbers, it is difficult to obtain the characteristic transmission spectrum of the present invention. On the other hand, it has been found that some triazine-based ultraviolet absorbers impart the characteristic transmission spectrum of the present invention.
従って、紫外線硬化性樹脂層に含有させる紫外線吸収剤は、トリアジン系紫外線吸収剤の中から選択することが好ましい。特に、下記一般式1で表されるトリアジン系紫外線吸収剤の中から選択することが好ましい。 Therefore, it is preferable to select the ultraviolet absorber contained in the ultraviolet curable resin layer from among triazine-based ultraviolet absorbers. In particular, it is preferable to select from triazine-based ultraviolet absorbers represented by the following general formula 1.
式中、R1〜R7はそれぞれ独立的に、水素原子、ハロゲン原子、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表す。 In the formula, R 1 to R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group, or an aralkyl group.
上記一般式1の中でも、特に下記の一般式2の化合物が好ましい。 Among the above general formula 1, a compound of the following general formula 2 is particularly preferable.
式中、R1、R4、R6はそれぞれ独立的に、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表し、R2、R3、R5、R7はそれぞれ独立的に、水素原子、ハロゲン原子、ヒドロキシ基、アルキル基、アルコキシ基、アリールオキシ基、アルコキシカルボニル基、シクロアルキル基、アリール基、またはアラルキル基を表す。 In the formula, each of R 1 , R 4 and R 6 independently represents a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group, or an aralkyl group, and R 2 , R 3 , R 5 and R 7 each independently represents a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, a cycloalkyl group, an aryl group or an aralkyl group.
一般式2の中でも、R1、R4、R6はそれぞれ、炭素数が1〜12のアルコキシ基であることが好ましい。 Among the general formula 2, R 1 , R 4 and R 6 are each preferably an alkoxy group having 1 to 12 carbon atoms.
上記一般式1もしくは一般式2で表されるトリアジン系紫外線吸収剤を以下に例示する。
2,4−ビス(2−ヒドロキシ−4−ブチロキシフェニル)−6−(2,4−ビス−ブチロキシフェニル)−1,3,5−トリアジン、
2,4−ビス((4−(2−エチル−ヘキシルオキシ)−2−ヒドロキシ)−フェニル))−6−(4−メトキシフェニル)−1,3,5−トリアジン、
2,4−ビス(2,4−ジヒドロキシフェニル)−6−(4−メトキシフェニル)−1,3,5−トリアジン、
2,4−ビス((4−(3−(2−プロピルオキシ)−2−ヒドロキシ−プロピルオキシ)−2−ヒドロキシ)−フェニル)−6−(4−メトキシフェニル)−1,3,5−トリアジン、
2,4−ビス(2−ヒドロキシ−4−オクトキシフェニル−6−(2,4−ジメチルフェニル)−1,3,5−トリアジン、
2,4−ビス(2−ヒドロキシ−4−プロピルオキシフェニル)−6−(2,4−ジメチルフェニル)−1,3,5−トリアジン、
2−フェニル−4,6−ビス(2−ヒドロキシ−4−(3’−(メトキシヘプタエトキシ)−2’−ヒドロキシプロポキシ)−フェニル)−1,3,5−トリアジン、
2−フェニル−4,6−ビス(2−ヒドロキシ−4−((メトキシトリエトキシカルボニル)−2−エトキシ)−フェニル)−1,3,5−トリアジン、
2−(4’−メトキシフェニル)−4,6−ビス(2’−ヒドロキシ−4’−n−オクチルオキシフェニル)−1,3,5−トリアジン。
Examples of triazine-based ultraviolet absorbers represented by the above general formula 1 or general formula 2 are shown below.
2,4-bis (2-hydroxy-4-butyroxyphenyl) -6- (2,4-bis-butyroxyphenyl) -1,3,5-triazine,
2,4-bis ((4- (2-ethyl-hexyloxy) -2-hydroxy) -phenyl))-6- (4-methoxyphenyl) -1,3,5-triazine,
2,4-bis (2,4-dihydroxyphenyl) -6- (4-methoxyphenyl) -1,3,5-triazine,
2,4-bis ((4- (3- (2-propyloxy) -2-hydroxy-propyloxy) -2-hydroxy) -phenyl) -6- (4-methoxyphenyl) -1,3,5- Triazine,
2,4-bis (2-hydroxy-4-octoxyphenyl-6- (2,4-dimethylphenyl) -1,3,5-triazine,
2,4-bis (2-hydroxy-4-propyloxyphenyl) -6- (2,4-dimethylphenyl) -1,3,5-triazine,
2-phenyl-4,6-bis (2-hydroxy-4- (3 ′-(methoxyheptaethoxy) -2′-hydroxypropoxy) -phenyl) -1,3,5-triazine,
2-phenyl-4,6-bis (2-hydroxy-4-((methoxytriethoxycarbonyl) -2-ethoxy) -phenyl) -1,3,5-triazine,
2- (4′-methoxyphenyl) -4,6-bis (2′-hydroxy-4′-n-octyloxyphenyl) -1,3,5-triazine.
紫外線吸収剤の添加量は、紫外線硬化性樹脂層の固形分総量100質量%に対して8質量%以下の範囲で選択することが好ましく、7質量%以下の範囲で選択することが好ましく、特に5質量%以下の範囲で選択することが好ましい。下限の添加量は、0.5質量%以上が好ましく、1質量%以上がより好ましく、特に1.5質量%以上が好ましい。 The addition amount of the ultraviolet absorber is preferably selected in the range of 8% by mass or less, more preferably in the range of 7% by mass or less, particularly with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer. It is preferable to select in the range of 5 mass% or less. The lower limit addition amount is preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 1.5% by mass or more.
紫外線吸収剤の添加量が8質量%を越えると、本発明の特徴的な透過スペクトルを付与できず、初期密着力が低下することがある。また、紫外線吸収剤の添加量が8質量%を越えると、紫外線吸収剤がブリードアウトするという不都合や耐擦傷性が低下するという不都合が生じることがある。 When the addition amount of the ultraviolet absorber exceeds 8% by mass, the characteristic transmission spectrum of the present invention cannot be provided, and the initial adhesion may be lowered. On the other hand, when the added amount of the UV absorber exceeds 8% by mass, there may be a disadvantage that the UV absorber bleeds out and a scratch resistance is lowered.
紫外線吸収剤の添加量が0.5質量%未満であると、本発明の特徴的な透過スペクトルを付与できず、紫外線暴露後の密着力が低下することがある。 When the addition amount of the ultraviolet absorber is less than 0.5% by mass, the characteristic transmission spectrum of the present invention cannot be provided, and the adhesion after exposure to ultraviolet rays may be reduced.
本発明の紫外線硬化性樹脂層は、紫外線硬化性樹脂組成物に紫外線を照射することによって硬化せしめた層である。 The ultraviolet curable resin layer of the present invention is a layer cured by irradiating the ultraviolet curable resin composition with ultraviolet rays.
紫外線硬化性樹脂層を構成する樹脂としては、(メタ)アクリロイル基等の重合性二重結合基を有するポリエステル樹脂、アクリル樹脂、ウレタン樹脂、エポキシ樹脂、シリコーン樹脂等のオリゴマー、プレポリマー、モノマー等のラジカル重合性化合物が挙げられる。 Examples of the resin constituting the ultraviolet curable resin layer include polyester resins having polymerizable double bond groups such as (meth) acryloyl groups, oligomers such as acrylic resins, urethane resins, epoxy resins, and silicone resins, prepolymers, monomers, and the like. These radically polymerizable compounds are mentioned.
これらの中でも、ウレタン(メタ)アクリレートオリゴマーもしくはモノマーが好ましく用いられる。ウレタン(メタ)アクリレートオリゴマーもしくはモノマーとしては、具体的には、共栄社化学社製のAT−600、UA−101l、UA−306H、UA−306T、UA−306l、UF−8001、UF−8003等、日本合成化学社製のUV7550B、UV−7600B、UV−1700B、UV−6300B、UV−7605B、UV−7640B、UV−7650B等、新中村化学社製のU−4HA、U−6HA、UA−100H、U−6LPA、U−15HA、UA−32P、U−324A、U−2PPA、UA−NDP等、ダイセルユーシービー社製のEbecryl−270、Ebecryl−284、Ebecryl−264、Ebecryl−9260、Ebecryl−1290、Ebecryl−1290K、Ebecryl−5129等、根上工業社製のUN−3220HA、UN−3220HB、UN−3220HC、UN−3220HS等、三菱レイヨン製のRQシリーズ、荒川化学工業製のビームセットシリーズ等が挙げられる。 Among these, urethane (meth) acrylate oligomers or monomers are preferably used. Specific examples of the urethane (meth) acrylate oligomer or monomer include AT-600, UA-101l, UA-306H, UA-306T, UA-306l, UF-8001, UF-8003, and the like manufactured by Kyoeisha Chemical Co., Ltd. Nippon Synthetic Chemical's UV7550B, UV-7600B, UV-1700B, UV-6300B, UV-7605B, UV-7640B, UV-7650B, etc., Shin-Nakamura Chemical U-4HA, U-6HA, UA-100H , U-6LPA, U-15HA, UA-32P, U-324A, U-2PPA, UA-NDP, etc., Ebecryl-270, Ebecryl-284, Ebecryl-264, Ebecryl-9260, Ebecryl- manufactured by Daicel UCB 1290, Ebecryl-1290K Etc. Ebecryl-5129, Negami Chemical Industrial Co., Ltd. of UN-3220HA, UN-3220HB, UN-3220HC, UN-3220HS, etc., manufactured by Mitsubishi Rayon Co., Ltd. of the RQ series, Arakawa Chemical Industry Co., Ltd. of beam set series, and the like.
紫外線硬化性樹脂層は、光重合開始剤を含有することが好ましい。光重合開始剤としては、例えば、イソプロピルベンゾインエーテル、イソブチルベンゾインエーテル、ベンゾフェノン、ミヒラーケトン、o−ベンゾイルメチルベンゾエート、アセトフェノン、2,4−ジエチルチオキサントン、2−クロロチオキサントン、エチルアントラキノン、p−ジメチルアミノ安息香酸イソアミルエステル、p−ジメチルアミノ安息香酸エチルエステル、1−ヒドロキシシクロヘキシルフェニルケトン、2−ヒドロキシ−2−メチル−1−フェニル−プロパン−1−オン、2,2−ジメトキシ−1,2−ジフェニルエタン−1−オン、2−ベンジル−2−ジメチルアミノ−1(4−モルフォリノフェニル)−ブタノン−1,ビス(2,4,6−トリメチルベンゾイル)−フェニルフォスフィンオキサイド、メチルベンジルホルメートなどが挙げられる。 The ultraviolet curable resin layer preferably contains a photopolymerization initiator. Examples of the photopolymerization initiator include isopropyl benzoin ether, isobutyl benzoin ether, benzophenone, Michler ketone, o-benzoylmethyl benzoate, acetophenone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, ethyl anthraquinone, p-dimethylaminobenzoic acid. Isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2,2-dimethoxy-1,2-diphenylethane 1-one, 2-benzyl-2-dimethylamino-1 (4-morpholinophenyl) -butanone-1, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, Jiruhorumeto and the like.
また、光重合開始剤は一般に市販されており、それらを使用することができる。例えば、
チバ・スペシャリティー・ケミカルズ(株)製のイルガキュア907、イルガキュア379、イルガキュア819、イルガキュア127、イルガキュア500、イルガキュア754、イルガキュア250、イルガキュア1800、イルガキュア1870、イルガキュアOXE01、DAROCUR TPO、DAROCUR1173等、日本シイベルヘグナー(株)製のSpeedcureMBB、SpeedcurePBZ、SpeedcureITX、SpeedcureCTX、SpeedcureEDB、Esacure ONE、Esacure KIP150、Esacure KTO46等、日本化薬(株)製のKAYACURE DETX−S、KAYACURE CTX、KAYACURE BMS、KAYACURE DMBI等が挙げられる。
Moreover, generally the photoinitiator is marketed and they can be used. For example,
Irgacure 907, Irgacure 379, Irgacure 819, Irgacure 127,
光重合開始剤の含有量は、紫外線硬化性樹脂層の固形分総量100質量%に対して0.1〜10質量%の範囲が適当であり、0.5〜8質量%の範囲が好ましい。 The content of the photopolymerization initiator is suitably in the range of 0.1 to 10% by mass and preferably in the range of 0.5 to 8% by mass with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer.
紫外線硬化性樹脂層には、更に、酸化防止剤、光安定剤、無機粒子、有機粒子、滑剤、帯電防止剤等を含有させることができる。 The ultraviolet curable resin layer may further contain an antioxidant, a light stabilizer, inorganic particles, organic particles, a lubricant, an antistatic agent, and the like.
本発明における紫外線硬化性樹脂層の厚みは、1〜30μmの範囲が好ましく、2〜15μmの範囲がより好ましく、特に3〜10μmの範囲が好ましい。 The thickness of the ultraviolet curable resin layer in the present invention is preferably in the range of 1 to 30 μm, more preferably in the range of 2 to 15 μm, and particularly preferably in the range of 3 to 10 μm.
[基材フィルム]
本発明における基材フィルムの材料は、特に限定される物ではないが、ポリエステル(例、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレートなど)、ポリメチルメタクリレート、アクリル樹脂、ポリカーボネート、ポリスチレン、トリアセチルセルロース、ポリビニルアルコール、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリエチレン、エチレン−酢酸ビニル共重合体、ポリビニルブチラール、金属イオン架橋エチレン−メタクリル酸共重合体、ポリウレタン、セロファン等が挙げられる。好ましくは、熱、溶剤、折り曲げ等の加工時の負荷に対する耐性が高く、透明性が特に高い点で、ポリエチレンテレフタレート、ポリカーボネート、ポリメチルメタクリレート等が挙げられ、より好ましくは、加工性に優れている点でポリエチレンテレフタレートが使用される。
[Base film]
The material of the base film in the present invention is not particularly limited, but polyester (eg, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polymethyl methacrylate, acrylic resin, polycarbonate, polystyrene, triacetyl cellulose , Polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane and the like. Preferably, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, and the like are mentioned in terms of high resistance to loads during processing such as heat, solvent, and bending, and particularly high transparency, and more preferably excellent workability. Polyethylene terephthalate is used in that respect.
本発明における基材フィルムは、透明であることが好ましい。ここでいう透明とは、JISK7136(2000年版)に定める全光線透過率が70%以上であり、ヘイズが3.0%以下のものをいう。 The base film in the present invention is preferably transparent. The term “transparent” as used herein means that the total light transmittance as defined in JISK7136 (2000 version) is 70% or more and the haze is 3.0% or less.
本発明における基材フィルムの厚みは、50〜250μmの範囲が好ましく、75〜200μmの範囲がより好ましい。 The thickness of the base film in the present invention is preferably in the range of 50 to 250 μm, and more preferably in the range of 75 to 200 μm.
基材フィルムとしてポリエチレンテレフタレートフィルムを用いる場合は、紫外線硬化性樹脂層を積層する面に易接着層を有するポリエチレンテレフタレートフィルムが好ましい。易接着層を有するポリエチレンテレフタレートフィルムを用いることにより、基材フィルムと紫外線硬化性樹脂層との密着力を更に強化することができる。 When a polyethylene terephthalate film is used as the base film, a polyethylene terephthalate film having an easy adhesion layer on the surface on which the ultraviolet curable resin layer is laminated is preferable. By using a polyethylene terephthalate film having an easy-adhesion layer, the adhesion between the base film and the ultraviolet curable resin layer can be further strengthened.
易接着層は、樹脂成分と架橋剤とを主成分とすることが好ましい。樹脂成分としてはポリエステル樹脂、アクリル樹脂、ウレタン樹脂が挙げられ、架橋剤としては、メラミン系架橋剤、オキサゾリン系架橋剤、カルボジイミド系架橋剤、イソシアネート系架橋剤、アジリジン系架橋剤、エポキシ系架橋剤が挙げられる。 It is preferable that an easily bonding layer has a resin component and a crosslinking agent as a main component. Examples of the resin component include polyester resin, acrylic resin, and urethane resin, and examples of the crosslinking agent include melamine crosslinking agent, oxazoline crosslinking agent, carbodiimide crosslinking agent, isocyanate crosslinking agent, aziridine crosslinking agent, and epoxy crosslinking agent. Is mentioned.
易接着層は、更に易滑性向上のために、無機微粒子を含有することが好ましい。無機微粒子としては、コロイダルシリカが好ましく用いられる。 The easy adhesion layer preferably contains inorganic fine particles in order to further improve the slipperiness. As the inorganic fine particles, colloidal silica is preferably used.
易接着層の厚みは、5〜300nmの範囲が好ましく、10〜250nmの範囲がより好ましく、特に15〜200nmの範囲が好ましい。 The thickness of the easy adhesion layer is preferably in the range of 5 to 300 nm, more preferably in the range of 10 to 250 nm, and particularly preferably in the range of 15 to 200 nm.
[積層フィルム]
本発明の積層フィルムには、基材フィルムと紫外線硬化性樹脂層易接着層との間、紫外線硬化性樹脂層の上、あるいは基材フィルムの紫外線硬化性樹脂層が積層された面とは反対面に、帯電防止層、耐摩耗性層、反射防止層、色補正層、印刷層、透明導電層、ガスバリア層、ホログラム層、剥離層、粘着層、接着層などの機能性層を積層してもよい。
[Laminated film]
The laminated film of the present invention is opposite to the surface on which the ultraviolet curable resin layer of the base film is laminated, between the base film and the UV curable resin layer easy adhesion layer, or on the ultraviolet curable resin layer. Functional layers such as antistatic layer, abrasion-resistant layer, antireflection layer, color correction layer, printing layer, transparent conductive layer, gas barrier layer, hologram layer, release layer, adhesive layer, adhesive layer are laminated on the surface. Also good.
また、本発明の積層フィルムは加飾成型やインモールド成型に好適であり、携帯電話、ノートパソコンの筐体の外装用フィルムとして、あるいは携帯電話のアイコンシートとして好適である。 The laminated film of the present invention is suitable for decorative molding and in-mold molding, and is suitable as an exterior film for a casing of a mobile phone or a notebook computer, or as an icon sheet for a mobile phone.
以下、本発明を実施例に基づきより具体的に説明するが、本発明は下記実施例に限定されるものではない。尚、実施例で用いた各物性値の評価法を以下に記載する。 EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example, this invention is not limited to the following Example. In addition, the evaluation method of each physical-property value used in the Example is described below.
(1)透過スペクトル
ポリエチレンテレフタレートフィルムの片面に紫外線硬化性樹脂層が積層された積層フィルムを作製し、常温で1日保管してから、島津製作所製の分光光度計(U−3410)にて波長300〜800nmの範囲で透過スペクトルを測定した。
実施例および比較例の積層フィルムは、いずれも基材フィルムがポリエチレンテレフタレートフィルムなので、作製した積層フィルムを常温で1日保管したものを、そのまま透過スペクトル測定用のサンプルとした。
(1) Transmission spectrum A laminated film in which an ultraviolet curable resin layer is laminated on one side of a polyethylene terephthalate film is prepared and stored at room temperature for 1 day, and then wavelength is measured with a spectrophotometer (U-3410) manufactured by Shimadzu Corporation. The transmission spectrum was measured in the range of 300 to 800 nm.
Since the base film was a polyethylene terephthalate film in each of the laminated films of Examples and Comparative Examples, a sample for storing the produced laminated film at room temperature for 1 day was directly used as a sample for transmission spectrum measurement.
(2)密着力
実施例および比較例で作製した積層フィルムを5cm×5cmに切り出して試験サンプルとした。23℃、45%RHの雰囲気下で、この試験サンプルの紫外線硬化性樹脂層上に、縦方向と横方向にそれぞれ1mm間隔の直線状カットを11本入れて1mm2のクロスカットマス目を100個作製した。このクロスカットマス目上にニチバン(株)製セロハンテープを貼り付けた後、セロハンテープを180度方向に剥離し、紫外線硬化性樹脂層の残存した個数により以下の基準で評価した。
1級:100個残存
2級:90〜99個残存
3級:0〜89個残存
1級と2級は実用上問題なく、3級は実用上問題となるレベルである。
(2) Adhesive strength The laminated films produced in the examples and comparative examples were cut into 5 cm × 5 cm and used as test samples. In an atmosphere of 23 ° C. and 45% RH, 11 linear cuts with an interval of 1 mm in each of the longitudinal direction and the lateral direction were put on the ultraviolet curable resin layer of this test sample, and a 1 mm 2 cross-cut grid was 100. Individually produced. A cellophane tape manufactured by Nichiban Co., Ltd. was affixed on the crosscut grid, and the cellophane tape was peeled off in the 180-degree direction, and evaluated according to the following criteria based on the number of remaining UV curable resin layers.
1st class: 100 remaining 2nd class: 90 to 99 remaining 3rd class: 0 to 89 remaining
Grades 1 and 2 have no practical problems, and grade 3 is a level that causes practical problems.
<初期密着力>
実施例および比較例で作製した積層フィルムを常温で1日保管後に上記方法で密着力を評価した。
<Initial adhesion>
After the laminated films prepared in Examples and Comparative Examples were stored at room temperature for 1 day, the adhesion was evaluated by the above method.
<紫外線暴露後の密着力>
実施例および比較例で作製した積層フィルムを常温で1日保管後、紫外線蛍光ランプ式耐光性試験機(Q−Panel社製の「QUV」;紫外線蛍光ランプUVA340nmを搭載)を使用して、下記条件での紫外線照射と紫外線未照射とを8サイクル繰り返し行って、積層フィルムに紫外線を照射した。その後積層フィルムを試験機から取り出し、23℃−45%RHの雰囲気下で60分間放置した後、上記方法で密着力を評価した。
・紫外線照射時の条件;63℃−50%RHの雰囲気下で8時間紫外線を照射。
・紫外線未照射時の条件;50℃−100%RHの雰囲気下で紫外線を照射せず4時間放置。
<Adhesion after UV exposure>
After the laminated films prepared in Examples and Comparative Examples were stored at room temperature for 1 day, the following was used using an ultraviolet fluorescent lamp type light resistance tester ("QUV" manufactured by Q-Panel; equipped with an ultraviolet fluorescent lamp UVA 340 nm). Ultraviolet irradiation under conditions and non-ultraviolet irradiation were repeated for 8 cycles, and the laminated film was irradiated with ultraviolet rays. Thereafter, the laminated film was taken out from the testing machine and allowed to stand for 60 minutes in an atmosphere of 23 ° C.-45% RH, and then the adhesion was evaluated by the above method.
-UV irradiation conditions: UV irradiation for 8 hours in an atmosphere of 63 ° C.-50% RH.
-Conditions when not irradiated with ultraviolet rays: left for 4 hours without irradiating ultraviolet rays in an atmosphere of 50 ° C to 100% RH.
(3)クラック伸度
実施例および比較例で作製した積層フィルムを常温で1日保管後、長さ110mm×幅20mmの短形に切り出して試験サンプルを作製した。引張試験機(島津製作所製の「オートグラフAGS−500NX」)を用いて、チャック間距離50mm、引張速度50mm/minで、目視にて紫外線硬化性樹脂層のクラック発生状態を確認しながら引張試験を行った。クラックが発生したときの伸度をクラック伸度とした。それぞれ5回測定し、平均した。
(3) Crack elongation The laminated films prepared in Examples and Comparative Examples were stored at room temperature for 1 day, and then cut into short shapes having a length of 110 mm and a width of 20 mm to prepare test samples. Using a tensile tester (“Autograph AGS-500NX” manufactured by Shimadzu Corporation), a tensile test while visually confirming the occurrence of cracks in the UV curable resin layer at a chuck distance of 50 mm and a tensile speed of 50 mm / min. Went. The elongation when the crack occurred was defined as the crack elongation. Each was measured 5 times and averaged.
(実施例1)
易接着層を有する厚み100μmポリエチレンテレフタレートフィルムの易接着層を有する面に、下記の紫外線硬化性樹脂層形成用組成物をグラビアコーターで塗工し、90℃で熱風乾燥した後、紫外線(積算光量400mJ/cm2)を照射して厚みが5μmの紫外線硬化性樹脂層を形成し、積層フィルムを得た。
<紫外線硬化性樹脂層形成用組成物>
荒川化学工業(株)製のUV硬化性ハードコーティング剤「ビームセット1200」に、紫外線吸収剤として2,4−ビス(2−ヒドロキシ−4−ブチロキシフェニル)−6−(2,4−ビス−ブチロキシフェニル)−1,3,5−トリアジンを、紫外線硬化性樹脂層の固形分総量100質量%に対して2.4質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
(Example 1)
The surface of the 100 μm polyethylene terephthalate film having the easy adhesion layer having the easy adhesion layer was coated with the following composition for forming an ultraviolet curable resin layer with a gravure coater and dried with hot air at 90 ° C. 400 mJ / cm 2 ) to form an ultraviolet curable resin layer having a thickness of 5 μm to obtain a laminated film.
<Composition for forming ultraviolet curable resin layer>
The UV curable hard coating agent “Beamset 1200” manufactured by Arakawa Chemical Industries, Ltd., and 2,4-bis (2-hydroxy-4-butoxyphenyl) -6- (2,4-bis) as an ultraviolet absorber. -Butyloxyphenyl) -1,3,5-triazine is added so as to be 2.4% by mass with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer to form an ultraviolet curable resin layer. A composition was prepared.
(実施例2)
紫外線吸収剤の添加量を5質量%に変更する以外は、実施例1と同様にして紫外線硬化性樹脂層形成用組成物を調製し、実施例1と同様にして積層フィルムを作製した。
(Example 2)
Except changing the addition amount of a ultraviolet absorber to 5 mass%, the composition for ultraviolet curable resin layer formation was prepared like Example 1, and the laminated film was produced like Example 1. FIG.
(実施例3)
下記の紫外線硬化性樹脂層形成用組成物に変更する以外は、実施例1と同様にして積層フィルムを作製した。
<紫外線硬化性樹脂層形成用組成物>
大日精化工業(株)製の紫外線硬化型樹脂「セイカビーム IL−PC2」に、紫外線吸収剤として2,4−ビス(2−ヒドロキシ−4−ブチロキシフェニル)−6−(2,4−ビス−ブチロキシフェニル)−1,3,5−トリアジンを、紫外線硬化性樹脂層の固形分総量100質量%に対して2.4質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
Example 3
A laminated film was produced in the same manner as in Example 1 except that the composition was changed to the following ultraviolet curable resin layer forming composition.
<Composition for forming ultraviolet curable resin layer>
The ultraviolet curable resin “SEICA BEAM IL-PC2” manufactured by Dainichi Seika Kogyo Co., Ltd. was added to 2,4-bis (2-hydroxy-4-butoxyphenyl) -6- (2,4-bis) as an ultraviolet absorber. -Butyloxyphenyl) -1,3,5-triazine is added so as to be 2.4% by mass with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer to form an ultraviolet curable resin layer. A composition was prepared.
(比較例1)
紫外線吸収剤の添加量を9質量%に変更する以外は、実施例1と同様にして紫外線硬化性樹脂層形成用組成物を調製し、実施例1と同様にして積層フィルムを作製した。
(Comparative Example 1)
Except changing the addition amount of a ultraviolet absorber to 9 mass%, the composition for ultraviolet curable resin layer formation was prepared like Example 1, and the laminated film was produced like Example 1. FIG.
(比較例2)
下記の紫外線硬化性樹脂層形成用組成物に変更する以外は、実施例1と同様にして積層フィルムを作製した。
<紫外線硬化性樹脂層形成用組成物>
荒川化学工業(株)製のUV硬化性ハードコーティング剤「ビームセット1200」に、紫外線吸収剤として2−[4−{2−ヒドロキシ−3−(2’−エチル)へキシルオキシ}−2−ヒドロキシフェニル]−4,6−ビス(2,4−ジメチルフェニル)−1,3,5−トリアジンを、紫外線硬化性樹脂層の固形分総量100質量%に対して4.8質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
(Comparative Example 2)
A laminated film was produced in the same manner as in Example 1 except that the composition was changed to the following ultraviolet curable resin layer forming composition.
<Composition for forming ultraviolet curable resin layer>
A UV curable hard coating agent “BEAMSET 1200” manufactured by Arakawa Chemical Industries, Ltd., and 2- [4- {2-hydroxy-3- (2′-ethyl) hexyloxy} -2-hydroxy as an ultraviolet absorber. [Phenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine is 4.8% by mass with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer. By addition, a composition for forming an ultraviolet curable resin layer was prepared.
(比較例3)
下記の紫外線硬化性樹脂層形成用組成物に変更する以外は、実施例1と同様にして積層フィルムを作製した。
<紫外線硬化性樹脂層形成用組成物>
荒川化学工業(株)製のUV硬化性ハードコーティング剤「ビームセット1200」に、紫外線吸収剤として2−(2−ヒドロキシ−5−tブチルフェニル)−2H−ベンゾトリアゾールを、紫外線硬化性樹脂層の固形分総量100質量%に対して4.8質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
(Comparative Example 3)
A laminated film was produced in the same manner as in Example 1 except that the composition was changed to the following ultraviolet curable resin layer forming composition.
<Composition for forming ultraviolet curable resin layer>
A UV-curable hard coating agent “BEAMSET 1200” manufactured by Arakawa Chemical Industries, Ltd. and 2- (2-hydroxy-5-tbutylphenyl) -2H-benzotriazole as an ultraviolet absorber, an ultraviolet-curable resin layer Was added so as to be 4.8% by mass relative to the total solid content of 100% by mass to prepare an ultraviolet curable resin layer forming composition.
(比較例4)
下記の紫外線硬化性樹脂層形成用組成物に変更する以外は、実施例1と同様にして積層フィルムを作製した。
<紫外線硬化性樹脂層形成用組成物>
荒川化学工業(株)製のUV硬化性ハードコーティング剤「ビームセット1200」に、紫外線吸収剤として2−(2−ヒドロキシ−5−メチルフェニル)−2H−ベンゾトリアゾールを、紫外線硬化性樹脂層の固形分総量100質量%に対して9質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
(Comparative Example 4)
A laminated film was produced in the same manner as in Example 1 except that the composition was changed to the following ultraviolet curable resin layer forming composition.
<Composition for forming ultraviolet curable resin layer>
A UV-curable hard coating agent “BEAMSET 1200” manufactured by Arakawa Chemical Industries, Ltd. was coated with 2- (2-hydroxy-5-methylphenyl) -2H-benzotriazole as an ultraviolet absorber, It added so that it might become 9 mass% with respect to 100 mass% of solid content, and the composition for ultraviolet curable resin layer formation was prepared.
(比較例5)
下記の紫外線硬化性樹脂層形成用組成物に変更する以外は、実施例1と同様にして積層フィルムを作製した。
<紫外線硬化性樹脂層形成用組成物>
日本化薬(株)製のアクリル系ハードコート剤「KAYANOVA FOP−1700」に、紫外線吸収剤として2−[4−{2−ヒドロキシ−3−(2’−エチル)へキシルオキシ}−2−ヒドロキシフェニル]−4,6−ビス(2,4−ジメチルフェニル)−1,3,5−トリアジンを、紫外線硬化性樹脂層の固形分総量100質量%に対して4.8質量%となるように添加して、紫外線硬化性樹脂層形成用組成物を調製した。
(Comparative Example 5)
A laminated film was produced in the same manner as in Example 1 except that the composition was changed to the following ultraviolet curable resin layer forming composition.
<Composition for forming ultraviolet curable resin layer>
Acrylic hard coat agent “KAYANOVA FOP-1700” manufactured by Nippon Kayaku Co., Ltd. and 2- [4- {2-hydroxy-3- (2′-ethyl) hexyloxy} -2-hydroxy as an ultraviolet absorber [Phenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine is 4.8% by mass with respect to 100% by mass of the total solid content of the ultraviolet curable resin layer. By addition, a composition for forming an ultraviolet curable resin layer was prepared.
<評価>
実施例および比較例で作製した積層フィルムについて、クラック伸度、密着力、透過スペクトルを測定し評価した。その結果を表1に示す。
<Evaluation>
About the laminated film produced by the Example and the comparative example, the crack elongation, the adhesive force, and the transmission spectrum were measured and evaluated. The results are shown in Table 1.
また、実施例1〜3、および比較例1〜5の透過スペクトルを図2、3に示す。本発明の実施例1〜3の透過スペクトルには、波長域320〜350nmに透過率が5%以上の透過ピークが存在する。 The transmission spectra of Examples 1 to 3 and Comparative Examples 1 to 5 are shown in FIGS. In the transmission spectra of Examples 1 to 3 of the present invention, a transmission peak having a transmittance of 5% or more exists in the wavelength region of 320 to 350 nm.
具体的には実施例1、3の透過スペクトルは、329nmに透過率が25%の透過ピークを有し、波長347nmに透過率が20%のボトムを有する。実施例2の透過スペクトルは、327nmに透過率が10%の透過ピークを有し、波長349nmに透過率が5%のボトムを有する。 Specifically, the transmission spectra of Examples 1 and 3 have a transmission peak with a transmittance of 25% at 329 nm and a bottom with a transmittance of 20% at a wavelength of 347 nm. The transmission spectrum of Example 2 has a transmission peak with a transmittance of 10% at 327 nm and a bottom with a transmittance of 5% at a wavelength of 349 nm.
このような透過スペクトルを有する実施例1〜3は、初期密着力と紫外線暴露後の密着力がともに良好であった。 In Examples 1 to 3 having such a transmission spectrum, both initial adhesion and adhesion after exposure to ultraviolet rays were good.
一方、比較例1の透過スペクトルは324nm透過ピークが存在するが、透過率が2%であり、本発明の特徴的な透過スペクトルは付与されなかった。その結果、初期密着力が低下した。 On the other hand, the transmission spectrum of Comparative Example 1 had a transmission peak of 324 nm, but the transmittance was 2%, and the characteristic transmission spectrum of the present invention was not imparted. As a result, the initial adhesion was reduced.
比較例2〜4には、本発明の特徴的な透過スペクトルは付与されなかった。その結果、比較例2〜4はいずれも初期密着力が低下した。比較例4は、ベンゾトリアゾール系紫外線吸収剤の添加量が9質量%と比較的多く、紫外線暴露後の密着力も低下した。 Comparative Examples 2 to 4 did not have the characteristic transmission spectrum of the present invention. As a result, in Comparative Examples 2 to 4, the initial adhesion was reduced. In Comparative Example 4, the amount of the benzotriazole ultraviolet absorber added was relatively large at 9% by mass, and the adhesion after exposure to ultraviolet rays also decreased.
比較例5の紫外線硬化性樹脂層は硬度の高い一般的なハードコート層であり、クラック伸度が10%未満であった。比較例5の紫外線硬化性樹脂層(ハードコート層)には本発明の特徴的な透過スペクトルは付与されていなかったが、初期密着力は問題なかった。このことから、紫外線硬化性樹脂層が紫外線吸収剤を含有するときの初期密着力の低下は、通常の高硬度でクラック伸度が小さいハードコート層の場合はあまり問題とはならず、紫外線硬化性樹脂層のクラック伸度が10%以上と大きい場合に問題となり易いことが分かる。 The ultraviolet curable resin layer of Comparative Example 5 was a general hard coat layer with high hardness, and the crack elongation was less than 10%. The ultraviolet curable resin layer (hard coat layer) of Comparative Example 5 was not given the characteristic transmission spectrum of the present invention, but the initial adhesion was not a problem. From this, the decrease in the initial adhesion when the ultraviolet curable resin layer contains an ultraviolet absorber is not so much a problem in the case of a hard coat layer having a normal high hardness and a small crack elongation. It can be seen that a problem easily occurs when the crack elongation of the conductive resin layer is as large as 10% or more.
1 透過ピーク
2 ボトム
1 Transmission peak 2 Bottom
Claims (6)
The laminated film for molding according to claim 4 or 5, wherein the triazine-based ultraviolet absorber is a compound represented by the general formula 2.
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