JP6404929B2 - Polypropylene resin for protective film and protective film - Google Patents

Polypropylene resin for protective film and protective film Download PDF

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JP6404929B2
JP6404929B2 JP2016538490A JP2016538490A JP6404929B2 JP 6404929 B2 JP6404929 B2 JP 6404929B2 JP 2016538490 A JP2016538490 A JP 2016538490A JP 2016538490 A JP2016538490 A JP 2016538490A JP 6404929 B2 JP6404929 B2 JP 6404929B2
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protective film
polypropylene resin
ethylene content
ethylene
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パク，ジ・ヨン
キム，チャン・ヒ
ジャン，ウォン・ジェ
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ハンファ トータル ペトロケミカル カンパニー リミテッド
ハンファ トータル ペトロケミカル カンパニー リミテッド
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/04—Monomers containing three or four carbon atoms
    • C08F10/06—Propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/04—Monomers containing three or four carbon atoms
    • C08F110/06—Propene
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/538—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/748—Releasability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
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  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

本発明に係る保護フィルム用ポリプロピレン樹脂はポリプロピレン樹脂内エチレンの含有量（ａ）は１０〜２０重量％であり、前記エチレンの含有量（ａ）と溶剤抽出物内エチレン含有量（ｂ）の比率（ｂ／ａ）が３〜４であることを特徴とし、粘着層との離型性に優れてフィッシュアイの発生を減らすのに優秀な効果を示す。 In the polypropylene resin for protective film according to the present invention, the content (a) of ethylene in the polypropylene resin is 10 to 20% by weight, and the ratio of the ethylene content (a) to the ethylene content (b) in the solvent extract. ( B / a ) is 3 to 4, and is excellent in releasability from the adhesive layer and excellent in reducing the generation of fish eyes.

液晶ディスプレイ（ＬＣＤ）のバックライトユニットは光源から出た光を反射、屈折、拡散させるための多様な光学シートで構成され、一般に使用される光学シートとしては反射シート、導光板、拡散シート、プリズムシート、保護シート（上拡散シート）、反射型偏光フィルムなどがある。   A backlight unit of a liquid crystal display (LCD) is composed of various optical sheets for reflecting, refracting, and diffusing light emitted from a light source, and commonly used optical sheets include a reflective sheet, a light guide plate, a diffusion sheet, and a prism. There are sheets, protective sheets (upper diffusion sheets), reflective polarizing films, and the like.

最近、ＬＣＤの開発方向はスリム化、画質向上、低電力化である。このために、バックライトユニットの光学シート厚さの低減、高輝度化および複合化により使用枚数の低減などの技術が展開されている。現在では、このような傾向に合わせて導光板の輝度向上のために表面にレンチキュラー形態の凹凸を形成したパターン導光板が商用化され、拡散と集光または集光と保護などの複数の機能を光学シート１枚により実現させるために両面に多様なパターンを形成した複合プリズムシートが増加している。   Recently, the development direction of LCD is slimming, improving image quality, and reducing power consumption. For this purpose, techniques such as reduction of the optical sheet thickness of the backlight unit, reduction of the number of sheets used by increasing the brightness and combination have been developed. Currently, in order to improve the brightness of the light guide plate according to this trend, pattern light guide plates with lenticular irregularities formed on the surface have been commercialized and have multiple functions such as diffusion and light collection or light collection and protection A composite prism sheet having various patterns formed on both sides is increasing in order to be realized by one optical sheet.

従来のバックライトユニットの光学シートは製造以降にバックライトユニット組み立て前まで保管、切断、印刷および移送過程で発生する表面汚染と損傷を防止するために保護フィルムを付着している。しかしながら、保護フィルム自体のフィッシュアイ（Ｆｉｓｈ ｅｙｅ）等による欠陥が存在する場合、光学シートの機能を損なう恐れがあるため、光学シート用保護フィルムの無欠点化が大変重要である。また、表面に微細な凹凸を有する光学シートは保護フィルムとの接触面積が小さいので、安定な粘着力を示すために平滑面の光学シート用保護フィルムよりはるかに高い粘着力を有する粘着層を保護フィルムの一面に導入するのが必要である。前記粘着層は保護フィルムの一面に粘着剤を直接コーティングしまたは基材層樹脂と粘着層樹脂とを共押出することにより得られるが、保護フィルムはロール状に巻き取られて保管されているので使用前まで粘着層と基材層の表面が接触することになっている。その結果、前記粘着層と基材層の表面とのブロッキング発生が大きいほど保護フィルムの使用時にフィルムロールの離型性が不良で作業性が顕著に低下する問題が発生し得る。   The optical sheet of the conventional backlight unit is attached with a protective film in order to prevent surface contamination and damage that occur in the process of storage, cutting, printing, and transporting after manufacture and before assembly of the backlight unit. However, when there is a defect due to fish eye or the like of the protective film itself, there is a risk of impairing the function of the optical sheet. Therefore, it is very important to eliminate the defect of the protective film for the optical sheet. In addition, since the optical sheet with fine irregularities on the surface has a small contact area with the protective film, it protects the adhesive layer that has a much higher adhesive force than the protective film for smooth optical sheets to show stable adhesive force. It must be introduced on one side of the film. The pressure-sensitive adhesive layer is obtained by directly coating a pressure-sensitive adhesive on one surface of the protective film or coextruding the base layer resin and the pressure-sensitive adhesive layer resin, but the protective film is stored in a roll shape. The adhesive layer and the surface of the base material layer are in contact with each other until use. As a result, the larger the occurrence of blocking between the adhesive layer and the surface of the base material layer, the more likely the problem is that the releasability of the film roll is poor when the protective film is used and the workability is significantly reduced.

上記問題を解決するために、本発明の目的は、フィッシュアイの発生が少なく粘着層との離型性に優れた保護フィルム用ポリプロピレン樹脂、およびこれによって製造された保護フィルムを提供することにある。   In order to solve the above-described problems, an object of the present invention is to provide a polypropylene resin for a protective film that is less likely to generate fish eyes and excellent in releasability from an adhesive layer, and a protective film produced thereby. .

上記目的を達成するための本願発明の一態様は、プロピレン単独重合体およびエチレンプロピレンブロック共重合体を含むポリプロピレン樹脂において、前記ポリプロピレン樹脂内エチレンの含有量（ａ）は１０〜２０重量％であり、前記エチレンの含有量（ａ）と１３５℃においてキシレンに抽出される成分内のエチレン含有量（ｂ）との比率（ｂ／ａ）が３〜４であることを特徴とする保護フィルム用ポリプロピレン樹脂を提供することにある。 One aspect of the present invention for achieving the above object is a polypropylene resin comprising a propylene homopolymer and an ethylene propylene block copolymer, wherein the content (a) of ethylene in the polypropylene resin is 10 to 20% by weight. The ratio (b / a) between the ethylene content (a) and the ethylene content (b) in the component extracted into xylene at 135 ° C. is 3 to 4, and is a polypropylene for a protective film It is to provide a resin.

本発明の好適な特徴によれば、前記ポリプロピレン樹脂はプロピレン単独重合体およびエチレンプロピレンブロック共重合体を含む。   According to a preferred feature of the invention, the polypropylene resin comprises a propylene homopolymer and an ethylene propylene block copolymer.

本発明のより好適な特徴によれば、前記ポリプロピレン樹脂は溶融指数が１〜１５ｇ／１０分である。   According to a more preferred feature of the invention, the polypropylene resin has a melt index of 1-15 g / 10 min.

本発明のさらに好適な特徴によれば、前記ポリプロピレン樹脂は、溶剤抽出物の固有粘度（ｃ）と、前記プロピレン単独重合体固有粘度（ｄ）との比率（ｃ／ｄ）が１．３〜１．９である。   According to a further preferred feature of the present invention, the polypropylene resin has a ratio (c / d) between the intrinsic viscosity (c) of the solvent extract and the intrinsic viscosity (d) of the propylene homopolymer of 1.3 to 1.9.

本発明の他の態様は、前記ポリプロピレン樹脂で製造されることを特徴とする保護フィルムを提供することにある。   Another aspect of the present invention is to provide a protective film produced from the polypropylene resin.

本発明の好適な特徴によれば、前記保護フィルムは平均表面粗さ（Ｒａ）が０．５μｍ〜１．５μｍであり、曇り度（Ｈａｚｅ）が６０％以上である。   According to a preferred feature of the present invention, the protective film has an average surface roughness (Ra) of 0.5 μm to 1.5 μm and a haze of 60% or more.

本発明のより好適な特徴によれば、前記保護フィルムは液晶ディスプレイ（ＬＣＤ）バックライトユニットの光学シート用である。   According to a more preferred feature of the present invention, the protective film is for an optical sheet of a liquid crystal display (LCD) backlight unit.

本発明に係る保護フィルム用ポリプロピレン樹脂は、粘着層との離型性に優れてフィッシュアイの発生を減らすのに優秀な効果を有する。   The polypropylene resin for protective film according to the present invention is excellent in releasability from the adhesive layer and has an excellent effect in reducing the generation of fish eyes.

また、前記ポリプロピレン樹脂を利用して製造された保護フィルムは、粘着層との離型性に優れフィッシュアイの発生率を低下させる効果を有することによってプリズムシート、マイクロレンズフィルム、パターン導光板および拡散板などの微細な表面凹凸を有するバックライトユニット光学シートの保護フィルムとして適用可能である。   In addition, the protective film manufactured using the polypropylene resin is excellent in releasability from the adhesive layer and has an effect of reducing the occurrence rate of fish eyes, whereby a prism sheet, a microlens film, a pattern light guide plate, and a diffusion plate. It can be applied as a protective film for a backlight unit optical sheet having fine surface irregularities such as a plate.

以下、本発明の望ましい実施例および各成分の物性について詳細に説明するが、これは本発明の属する技術分野で通常の知識を有する者が本発明を容易に実施できる程度に詳細に説明するためのものであり、これにより本発明の技術的思想および範疇が限定されることを意味するのではない。   Hereinafter, preferred embodiments of the present invention and physical properties of each component will be described in detail. However, this is intended to explain in detail to the extent that a person having ordinary knowledge in the technical field to which the present invention belongs can easily carry out the present invention. This does not mean that the technical idea and category of the present invention are limited thereby.

本発明に係るポリプロピレン樹脂は、プロピレン単独重合体およびエチレンプロピレンブロック共重合体を含み、前述したポリプロピレン樹脂内エチレンの含有量（ａ）は１０〜２０重量％であり、前述したエチレンの含有量（ａ）と溶剤抽出物内エチレン含有量（ｂ）との比率（ｂ／ａ）が３〜４であることを特徴とする。 The polypropylene resin according to the present invention includes a propylene homopolymer and an ethylene propylene block copolymer, and the ethylene content (a) in the polypropylene resin described above is 10 to 20% by weight, and the ethylene content ( The ratio ( b / a ) between a) and the ethylene content (b) in the solvent extract is 3-4.

前述したポリプロピレン樹脂はプロピレン単独重合体とエチレンプロピレンブロック共重合体が反応器内で段階的に重合されるのが望ましい。   As for the polypropylene resin mentioned above, it is desirable that a propylene homopolymer and an ethylene propylene block copolymer are polymerized stepwise in a reactor.

前述したポリプロピレン樹脂のエチレン含有量は１０〜２０重量％であり、好ましくは１０〜１５重量％である。前述したエチレン含有量が１０重量％未満の場合には保護フィルムの表面粗さが低くなって十分な離型性が得られず、２０重量％を超える場合にはゴム状高分子同士の絡まりが増加してフィッシュアイ（Ｆｉｓｈ ｅｙｅ）の発生が増加する問題点を有する。   The ethylene content of the polypropylene resin described above is 10 to 20% by weight, preferably 10 to 15% by weight. When the ethylene content is less than 10% by weight, the surface roughness of the protective film is low and sufficient releasability cannot be obtained, and when it exceeds 20% by weight, the rubbery polymers are entangled. There is a problem in that the occurrence of fish eyes increases.

前述したポリプロピレン樹脂はポリプロピレン樹脂内エチレン含有量と溶剤抽出物内エチレン含有量との比率（ｂ／ａ）が３〜４であることが好ましい。当該含有量比が３未満であるか４を超える場合には溶剤抽出物の含有量および溶剤抽出物内エチレンの含有量が過度に高かったり低くなることがあるので、高い表面粗さと少ないフィッシュアイを同時に満足させる保護フィルムを提供できないので望ましくない。 The polypropylene resin described above preferably has a ratio ( b / a ) of 3 to 4 between the ethylene content in the polypropylene resin and the ethylene content in the solvent extract. When the content ratio is less than 3 or exceeds 4, the content of the solvent extract and the content of ethylene in the solvent extract may be excessively high or low. This is not desirable because it cannot provide a protective film that satisfies the above requirements.

前述したポリプロピレン樹脂の溶融指数は１〜１５ｇ／１０分（ＡＳＴＭ Ｄ１２３８）であり、好ましくは３〜１０ｇ／１０分である。前述した溶融指数が１ｇ／１０分未満の場合にはフィルム成形時に圧出負荷が上昇し樹脂の流動性が低下して生産性が効率的でない問題点を有し、１５ｇ／１０分を超過する場合にはダイから吐き出される溶融樹脂の粘度が低くなってフィルムの厚さ均一性が悪化してフィルム成形が容易でないので望ましくない。   The above-mentioned polypropylene resin has a melt index of 1 to 15 g / 10 min (ASTM D1238), preferably 3 to 10 g / 10 min. When the aforementioned melt index is less than 1 g / 10 min, there is a problem that the extrusion load increases during film forming, the fluidity of the resin decreases, and the productivity is not efficient, and exceeds 15 g / 10 min. In such a case, the viscosity of the molten resin discharged from the die is lowered, the film thickness uniformity is deteriorated, and film formation is not easy.

また、前述したポリプロピレン樹脂において溶剤抽出物の固有粘度（ｃ）と前述したプロピレン単独重合体の固有粘度（ｄ）の比率（ｃ／ｄ）が１．３〜１．９であることが好ましい。当該固有粘度比が１．３未満の場合には保護フィルムの表面粗さが低くなり粘着層との離型性が低下して保護フィルムとして適用し難い問題点を有し、１．９を超える場合には前述したプロピレン単独重合体とゴム成分間との混和性が低下してゴム成分が互いに絡まったり固まる場合が発生し、保護フィルム上にフィッシュアイの発生が増加する可能性もあるので望ましくない。   In the polypropylene resin described above, the ratio (c / d) of the intrinsic viscosity (c) of the solvent extract to the intrinsic viscosity (d) of the propylene homopolymer described above is preferably 1.3 to 1.9. When the intrinsic viscosity ratio is less than 1.3, the surface roughness of the protective film is low, the releasability from the adhesive layer is lowered, and it is difficult to apply as a protective film, and exceeds 1.9. In some cases, the miscibility between the propylene homopolymer and the rubber component described above may decrease, and the rubber components may be entangled or hardened, which may increase the generation of fish eyes on the protective film. Absent.

本発明に係るポリプロピレン樹脂は前述した成分以外にも必要に応じて、本発明の効果を損なわない範囲内で、酸化防止剤、中和剤、熱安定剤および紫外線遮断剤などの添加剤をさらに含むことができるが、これに限定されない。   In addition to the components described above, the polypropylene resin according to the present invention may further contain additives such as an antioxidant, a neutralizing agent, a heat stabilizer, and an ultraviolet blocker as long as the effects of the present invention are not impaired. It can include, but is not limited to this.

本発明に係る保護フィルムは前述したポリプロピレン樹脂で製造されることを特徴とし、前述した保護フィルムの平均表面粗さ（Ｒａ）は０．５μｍ〜１．５μｍであるのが好ましい。平均表面粗さが０．５μｍ未満の場合には粘着層と十分な離型性を得難い問題点があり、１．５μｍを超過する場合にはフィルムの外形が不良で保護フィルムの用途として適さないので望ましくない。   The protective film according to the present invention is manufactured from the polypropylene resin described above, and the average surface roughness (Ra) of the protective film described above is preferably 0.5 μm to 1.5 μm. When the average surface roughness is less than 0.5 μm, there is a problem that it is difficult to obtain sufficient release properties from the adhesive layer, and when it exceeds 1.5 μm, the outer shape of the film is poor and is not suitable for use as a protective film. So undesirable.

また、前述した保護フィルムの曇り度（Ｈａｚｅ）は６０％以上であるのが好ましく、曇り度が６０％未満である場合には保護フィルムの表面粗さが低くなって離型性が低下する恐れがあるので望ましくない。   Further, the haze (Haze) of the protective film described above is preferably 60% or more, and when the haze is less than 60%, the surface roughness of the protective film is lowered and the releasability may be lowered. This is not desirable.

前述した保護フィルムは光学シートなどに適用可能であり、具体的には液晶ディスプレイ（ＬＣＤ）バックライトユニットの光学シートに適用可能である。   The above-described protective film can be applied to an optical sheet or the like, and specifically, can be applied to an optical sheet of a liquid crystal display (LCD) backlight unit.

以下、本発明に係る保護フィルム用ポリプロピレン樹脂および保護フィルムについて実施例を挙げて説明する。   Hereinafter, the polypropylene resin for protective film and the protective film according to the present invention will be described with reference to examples.

各実施例１ないし６および比較例１ないし５において、諸般物性の測定／評価項目およびその測定方法は次の通りである。   In each of Examples 1 to 6 and Comparative Examples 1 to 5, measurement / evaluation items of various physical properties and measurement methods thereof are as follows.

（１）溶融指数（Ｍｅｌｔ Ｉｎｄｅｘ）
ＡＳＴＭ Ｄ１２３８条件により２３０℃、２．１６ｋｇの条件で測定した。 (1) Melt index
The measurement was performed under conditions of 230 ° C. and 2.16 kg according to ASTM D1238 conditions.

（２）溶剤抽出含有量
キシレン溶剤を利用して１３５℃で溶解可能な重量を測定した。 (2) Solvent extraction content The weight which can be melt | dissolved at 135 degreeC using the xylene solvent was measured.

（３）エチレン含有量
赤外線吸収スペクトル（ＦＴ-ＩＲ）を利用してポリプロピレン樹脂内に存在するエチレン含有量を測定した。 (3) Ethylene content Using the infrared absorption spectrum (FT-IR), the ethylene content present in the polypropylene resin was measured.

（４）溶剤抽出物内エチレン含有量
赤外線吸収スペクトル（ＦＴ-ＩＲ）を利用してポリプロピレン樹脂の溶剤抽出物内に存在するエチレン含有量を測定した。 (4) Ethylene content in solvent extract The ethylene content present in the solvent extract of polypropylene resin was measured using an infrared absorption spectrum (FT-IR).

（５）固有粘度比
固有粘度は１３５℃、デカリン（Ｄｅｋａｌｉｎ）溶液下で粘度測定器を利用して測定し、固有粘度比は次のように計算される。 (5) Intrinsic viscosity ratio Intrinsic viscosity is measured using a viscometer at 135 ° C. under a Decalin solution, and the intrinsic viscosity ratio is calculated as follows.

固有粘度比＝（ポリプロピレン樹脂内溶剤抽出物の固有粘度）÷（プロピレン単独重合体の固有粘度）   Intrinsic viscosity ratio = (Intrinsic viscosity of solvent extract in polypropylene resin) ÷ (Intrinsic viscosity of propylene homopolymer)

（６）表面粗さ（Ｒａ）
Ｖｅｅｃｏ社製の３次元表面粗さ計Ｗｙｋｏ ＮＴ９１００を使用して０．６４ｘ０．４８ｍｍのフィルム面積で基材層面の中心線平均表面粗さ（Ｒａ）を測定した。 (6) Surface roughness (Ra)
The centerline average surface roughness (Ra) of the base material layer surface was measured with a film area of 0.64 × 0.48 mm using a three-dimensional surface roughness meter Wyko NT9100 manufactured by Veeco.

（７）曇り度（Ｈａｚｅ）
ＡＳＴＭ Ｄ１００３条件により曇り度を測定した。 (7) Cloudiness (Haze)
The haze was measured according to ASTM D1003 conditions.

（８）光沢度（Ｇｌｏｓｓ）
ＡＳＴＭ Ｄ２４５７条件により４５°で基材層面の光沢度を測定した。 (8) Glossiness (Gloss)
The glossiness of the substrate layer surface was measured at 45 ° according to ASTM D2457 conditions.

（９）フィッシュアイ（Ｆｉｓｈ ｅｙｅ）
フィルム成形後に光学フィッシュアイカウンター（Ｆｕｔｅｃ Ｍａｘ ｅｙｅ Ｃ）でフィルム上に存在する０．３ｍｍ長さ以上のフィッシュアイ個数を単位面積当たりの発生個数に換算して記載した。測定結果は１ｍ２面積を３回測定した平均値である。 (9) Fish eye
The number of fish eyes having a length of 0.3 mm or more present on the film was converted into the number of generated per unit area using an optical fish eye counter (Futec Max eye C) after film formation. A measurement result is the average value which measured 1 m2 area 3 times.

（１０）離型力
粘着層と基材層を５ｋｇ荷重で１回往復して付着した後、試片を幅２５ｍｍ、長さ１５０ｍｍに切断して３０分後に万能試験機（ＵＴＭ）を利用して１５０ｍｍ／分の速度で粘着層と基材層の間を１８０°で剥離した時の荷重値（ｇ／２５ｍｍ）を測定した。 (10) Release force After the adhesive layer and the base material layer have been reciprocated once with a 5 kg load, the specimen was cut to a width of 25 mm and a length of 150 mm, and after 30 minutes, a universal testing machine (UTM) was used. The load value (g / 25 mm) when the adhesive layer and the base material layer were peeled at 180 ° at a speed of 150 mm / min was measured.

＜実施例１＞ポリプロピレン樹脂の製造
プロピレン単独重合体とエチレンプロピレンゴムを反応器内で段階的に重合してポリプロピレン樹脂ＰＰ１〜ＰＰ１０を製造し、製造されたポリプロピレンの物性を下記の表１に示した。 <Example 1> Production of polypropylene resin Propylene homopolymer and ethylene propylene rubber are polymerized stepwise in a reactor to produce polypropylene resins PP1 to PP10, and the physical properties of the produced polypropylene are shown in Table 1 below. It was.

Figure 0006404929
Figure 0006404929

＜実施例２〜６＞
通常の２層キャストフィルム圧出設備を利用して前述した実施例１で製造されたポリプロピレン樹脂からなる基材層および粘着層を共押出し、厚さが５０μｍである２層の保護フィルムを製造し、製造された保護フィルムの物性を下記の表２に示した（但し、粘着層はＤＹＮＡＲＯＮ１３２０Ｐ（ＪＳＲ社製）を使用し、前述した２層フィルムは基材層と粘着層との厚さ比率を４：１に固定した）。 <Examples 2 to 6>
A base layer and an adhesive layer made of the polypropylene resin produced in Example 1 described above were coextruded using a normal two-layer cast film extrusion facility to produce a two-layer protective film having a thickness of 50 μm. The physical properties of the produced protective film are shown in Table 2 below (however, the adhesive layer uses DYNARON1320P (manufactured by JSR), and the above-mentioned two-layer film has a thickness ratio between the base material layer and the adhesive layer). 4: 1).

Figure 0006404929
Figure 0006404929

＜比較例１〜５＞
前述した実施例２〜６と同様に行い、製造された保護フィルムの物性を下記の表３に示した。 <Comparative Examples 1-5>
The physical properties of the protective films produced in the same manner as in Examples 2 to 6 described above are shown in Table 3 below.

Figure 0006404929
Figure 0006404929

上記した表２ないし表３を察してみると、前述した比較例１および比較例２はポリプロピレン樹脂内エチレン含有量が低く、かつｂ／ａの含有量比が高くてフィッシュアイは減少したが、平均表面粗さが低くて曇り度が低く離型力が増加したことを確認することができ、比較例３はｂ／ａの含有量比が高くてフィッシュアイが急激に増加し保護フィルムの外形が非常に不良であるため、離型性評価の測定が不可能であった。また、ポリプロピレン樹脂内エチレン含有量が高くｂ／ａの含有量比が非常に低い比較例４の場合にもフィッシュアイが急激に増加し保護フィルムの外形が非常に不良であるので離型性評価の測定が不可能であった。固有粘度比が１．９を超える比較例５の場合には平均表面粗さが高くて離型性は良好であったが、フィッシュアイが大きく増加することを確認することができる。 Looking at Table 2 to Table 3 above, Comparative Example 1 and Comparative Example 2 described above had a low ethylene content in the polypropylene resin and a high b / a content ratio, and the fish eye decreased. It can be confirmed that the average surface roughness is low, the haze is low, and the release force is increased. In Comparative Example 3, the b / a content ratio is high, and the fisheye is rapidly increased. Is very poor, and it was impossible to measure the releasability. Also, in the case of Comparative Example 4 in which the ethylene content in the polypropylene resin is high and the content ratio of b / a is very low, the fisheye is rapidly increased and the outer shape of the protective film is very poor, so that the release property evaluation It was impossible to measure. In the case of Comparative Example 5 having an intrinsic viscosity ratio exceeding 1.9, the average surface roughness was high and the releasability was good, but it can be confirmed that the fish eye greatly increases.

一方、前述した実施例２ないし６で製造された保護フィルムは平均表面粗さが０．５μｍないし１．５μｍであり、曇り度が６０％以上で粘着層との形成に優れて、フィッシュアイの発生が顕著に低いことを確認することができる。   On the other hand, the protective films manufactured in Examples 2 to 6 described above have an average surface roughness of 0.5 μm to 1.5 μm, a haze of 60% or more, and are excellent in formation with an adhesive layer. It can be confirmed that the occurrence is remarkably low.

したがって、本発明に係る保護フィルム用ポリプロピレン樹脂は粘着層との離型性に優れてフィッシュアイの発生を減らすのに優秀な効果を示し、また、前記ポリプロピレン樹脂を利用して製造された保護フィルムは、粘着層との優れた離型性およびフィッシュアイの低発生率によってプリズムシート、マイクロレンズフィルム、パターン導光板および拡散板などの微細な表面凹凸を有するバックライトユニット光学シートの保護フィルムとして適用可能であることがわかった。   Therefore, the polypropylene resin for a protective film according to the present invention is excellent in releasability from the adhesive layer and has an excellent effect in reducing the generation of fish eyes, and the protective film manufactured using the polypropylene resin Applied as a protective film for backlight unit optical sheet with fine surface irregularities such as prism sheet, microlens film, pattern light guide plate and diffuser plate due to excellent releasability with adhesive layer and low incidence of fish eye I found it possible.

Claims (7)

プロピレン単独重合体およびエチレンプロピレンブロック共重合体を含むポリプロピレン樹脂において、前記ポリプロピレン樹脂内エチレンの含有量（ａ）は１０〜２０重量％であり、前記エチレンの含有量（ａ）と１３５℃においてキシレンに抽出される成分内のエチレン含有量（ｂ）との比率（ｂ／ａ）が３〜４であることを特徴とする保護フィルム用ポリプロピレン樹脂。 In a polypropylene resin containing a propylene homopolymer and an ethylene propylene block copolymer, the ethylene content (a) in the polypropylene resin is 10 to 20% by weight, and the ethylene content (a) and xylene at 135 ° C. A polypropylene resin for a protective film, wherein the ratio (b / a) to the ethylene content (b) in the component extracted in (3) is 3-4. 前記ポリプロピレン樹脂は、プロピレン単独重合体およびエチレンプロピレンブロック共重合体を含むことを特徴とする請求項１に記載の保護フィルム用ポリプロピレン樹脂。   The said polypropylene resin contains a propylene homopolymer and an ethylene propylene block copolymer, The polypropylene resin for protective films of Claim 1 characterized by the above-mentioned. 前記ポリプロピレン樹脂は、溶融指数が１〜１５ｇ／１０分であることを特徴とする請求項１に記載の保護フィルム用ポリプロピレン樹脂。   The polypropylene resin for a protective film according to claim 1, wherein the polypropylene resin has a melt index of 1 to 15 g / 10 minutes. 前記ポリプロピレン樹脂は、溶剤抽出物の固有粘度（ｃ）と前記プロピレン単独重合体固有粘度（ｄ）との比率（ｃ／ｄ）が１．３〜１．９であることを特徴とする請求項１に記載の保護フィルム用ポリプロピレン樹脂。   The polypropylene resin has a ratio (c / d) of 1.3 to 1.9 of the intrinsic viscosity (c) of the solvent extract and the intrinsic viscosity (d) of the propylene homopolymer. 1. Polypropylene resin for protective film according to 1. 請求項１乃至４のうちいずれか一項に記載のポリプロピレン樹脂で製造されることを特徴とする保護フィルム。   A protective film made of the polypropylene resin according to any one of claims 1 to 4. 前記保護フィルムは、平均表面粗さ（Ｒａ）が０．５μｍ〜１．５μｍであり、曇り度（Ｈａｚｅ）が６０％以上であることを特徴とする請求項５に記載の保護フィルム。   The protective film according to claim 5, wherein the protective film has an average surface roughness (Ra) of 0.5 μm to 1.5 μm and a haze of 60% or more. 前記保護フィルムは液晶ディスプレイ（ＬＣＤ）バックライトユニットの光学シート用であることを特徴とする請求項５に記載の保護フィルム。   The protective film according to claim 5, wherein the protective film is for an optical sheet of a liquid crystal display (LCD) backlight unit.
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