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TW201930422A - Polyvinyl alcohol film, film roll, and method for producing film roll - Google Patents

Polyvinyl alcohol film, film roll, and method for producing film roll Download PDF

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TW201930422A
TW201930422A TW107146344A TW107146344A TW201930422A TW 201930422 A TW201930422 A TW 201930422A TW 107146344 A TW107146344 A TW 107146344A TW 107146344 A TW107146344 A TW 107146344A TW 201930422 A TW201930422 A TW 201930422A
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film
anionic surfactant
polyvinyl alcohol
pva
mass
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TW107146344A
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TWI770337B (en
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梅本涼平
鳥越信一
高藤勝啓
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日商可樂麗股份有限公司
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/05Alcohols; Metal alcoholates
    • C08K5/053Polyhydroxylic alcohols
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/20Carboxylic acid amides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/36Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/41Compounds containing sulfur bound to oxygen
    • C08K5/42Sulfonic acids; Derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Polarising Elements (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Provided are a polyvinyl alcohol film, a film roll, and a method for producing a film roll, wherein aggregates originating from an activator present within the film, which cause deterioration in the polarizing plate performance, are reduced. Disclosed is a polyvinyl alcohol film including a polyvinyl alcohol (A), a nonionic surfactant (B), an anionic surfactant (C1), and a sulfonic acid-based anionic surfactant (C2) that is different from said C1, wherein: the polyvinyl alcohol (A) has an average degree of polymerization of from 500 to 7000 and a degree of saponification of 99.0 mol% or greater; the content of each of the nonionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) to 100 parts by mass of the polyvinyl alcohol (A) is from 0.001 to 1 part by mass; the ratio [(C1+C2)/B] of the total mass of the anionic surfactant (C1) and the sulfonic acid-based anionic surfactant (C2) to the nonionic surfactant (B) is from 1 to 10; and the mass ratio (C2/C1) of the sulfonic acid-based anionic surfactant (C2) to the anionic surfactant (C1) is from 0.1 to 10.

Description

聚乙烯醇薄膜、薄膜卷及薄膜卷之製造方法    Polyvinyl alcohol film, film roll and film roll manufacturing method   

本發明係關於表面平滑性優良,且存在於薄膜內部並減低凝集物的聚乙烯醇薄膜(以下,有將「聚乙烯醇」簡記為「PVA」的情況)、薄膜卷之製造方法,其中該凝集物係來自存在於薄膜內部之活性劑,且成為偏光板性能降低的原因。 The present invention relates to a polyvinyl alcohol film which has excellent surface smoothness and is present inside the film and reduces agglomerates (hereinafter, "polyvinyl alcohol" will be abbreviated as "PVA"), and a method for producing a film roll, wherein The agglomerates are derived from the active agent existing inside the film, and cause the degradation of the performance of the polarizing plate.

PVA薄膜利用有關透明性、光學特性、機械強度、水溶性等之獨特性質,而使用於各種用途。尤其,利用其優良的光學特性,PVA薄膜被用作構成為液晶顯示器(LCD)之基本構成要素的偏光板之偏光薄膜的製造原料(原始薄膜),其用途日益擴大。在LCD用偏光板方面,尋求高光學性能,對於為其構成要素之偏光薄膜,亦要求高光學性能。 PVA films are used in various applications by taking advantage of unique properties such as transparency, optical properties, mechanical strength, and water solubility. In particular, by virtue of its excellent optical characteristics, PVA films are used as a raw material (original film) for manufacturing a polarizing film of a polarizing plate that is a basic constituent element of a liquid crystal display (LCD), and its use is expanding. As for the polarizing plate for LCD, high optical performance is sought, and the polarizing film which is a constituent element of the polarizing film also requires high optical performance.

偏光板,一般而言,藉由將PVA薄膜染色後進行單軸延伸,或一邊染色一邊進行單軸延伸,或單軸延伸後進行染色,製作染色之單軸延伸薄膜,並將其以硼化合物固定處理的方法,或在前述之單軸延伸‧染色處理時,與染色同時藉由硼化合物進行固定處理的方法等,製造偏光薄膜後,在該偏光薄膜之表面,貼合三乙酸纖維素(TAC)薄膜、乙酸‧丁酸纖維素(CAB)薄膜等保護膜而製造。 Polarizers are generally made by dyeing a PVA film and then uniaxially stretching it, or dyeing it uniaxially, or dyeing it after uniaxially stretching to produce a dyed uniaxially stretched film, and using a boron compound A method of fixing treatment, or a method of performing a fixing treatment with a boron compound at the same time as the aforementioned uniaxial extension and dyeing treatment, after manufacturing a polarizing film, and then attaching cellulose triacetate on the surface of the polarizing film ( TAC) film, protective film such as cellulose acetate ‧ butyrate (CAB) film.

迄今,關於PVA薄膜、其製造方法,已知有許多技術。在專利文獻1中,記載薄膜製造時,以單獨添加1種或併用2種之膜面異常減低效果優良的烷醇醯胺型界面活性劑為較佳。先前藉由使用專利文獻1所記載之薄膜的偏光板雖可滿足品質,然而近年對於LCD之高精細化、圖像之鮮明化的要求變高,隨此偏光薄膜中之微細裂痕或孔隙成為問題的情況變多。若偏光薄膜中含有多個裂痕或孔隙,則薄膜之霧度會上升,此種偏光薄膜無法用於要求高精細性或鮮明圖像之用途。 To date, many techniques have been known regarding PVA films and methods for producing them. In Patent Document 1, it is described that an alkanolamine type surfactant having an excellent film surface abnormality reduction effect by adding one kind alone or two kinds in combination when using a thin film is preferable. Although the polarizing plate using the thin film described in Patent Document 1 previously can satisfy the quality, in recent years, the requirements for high definition of LCDs and sharpening of images have become higher. With this, fine cracks or pores in polarizing films have become a problem. The situation becomes more. If there are multiple cracks or pores in the polarizing film, the haze of the film will increase, and such a polarizing film cannot be used for applications requiring high definition or sharp images.

先行技術文獻Advance technical literature 專利文獻Patent literature

專利文獻1 國際公開第2013/146533號 Patent Document 1 International Publication No. 2013/146533

本發明為用於解決上述問題而完成者,其目的為提供一種薄膜表面之缺點少,且減低成為偏光板性能降低之原因之來自存在於薄膜內部之活性劑之凝集物的PVA薄膜。 The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a PVA film having fewer defects on the surface of the film and reducing the agglomerates of active agents existing in the film, which cause a reduction in performance of the polarizing plate.

本發明人等為達成上述目的而重複專心檢討之結果,發現包含以設定之比率含有非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及磺酸系陰離子性界面活性劑(C2)之PVA水溶液的PVA薄膜,可得到薄膜表面之缺點少,在維持先前之表面平滑性下,減低成為偏光板性能降低之原因之來自存在於薄膜內部之活性劑之凝集物的PVA薄膜,於是完成本發明。 As a result of repeated intensive reviews by the present inventors to achieve the above-mentioned object, they found that the non-ionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant ( C2) PVA film of PVA aqueous solution can obtain the film surface with fewer defects. Under the maintenance of the previous surface smoothness, the PVA film from the agglomerates of active agents existing in the film, which reduces the performance of the polarizing plate, is reduced. The present invention has been completed.

亦即,本發明係關於:[1]一種聚乙烯醇薄膜,其為含有聚乙烯醇(A)、非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及與前述C1相異之磺酸系陰離子性界面活性劑(C2)的聚乙烯醇薄膜;其中聚乙烯醇(A)係平均聚合度為500~7000,皂化度為99.0莫耳%以上;相對於100質量份之聚乙烯醇(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及前述磺酸系陰離子性界面活性劑(C2)之含量,任一者均為0.001~1質量份;相對於非離子性界面活性劑(B),陰離子性界面活性劑(C1)及前述磺酸系陰離子性界面活性劑(C2)之合計質量比[(C1+C2)/B]為1~10;相對於陰離子性界面活性劑(C1),前述磺酸系陰離子性界面活性劑(C2)之質量比(C2/C1)為0.1~10;[2]如前述[1]記載之聚乙烯醇薄膜,其中相對於100質量份之聚乙烯醇(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及前述磺酸系陰離子性界面活性劑(C2)之合計含量(B+C1+C2)為0.1~1質量份;[3]如前述[1]或[2]記載之聚乙烯醇薄膜,其進一步含有可塑劑(D),相對於100質量份之聚乙烯醇(A),可塑劑(D)之含量為1~20質量份;[4]如前述[1]至[3]中任一項記載之聚乙烯醇薄膜,其中薄膜之厚度為10~80μm;[5]如前述[1]至[4]中任一項記載之聚乙烯醇薄膜,其中薄膜寬度為3m以上; [6]一種薄膜卷,其係前述[1]至[5]中任一項記載之聚乙烯醇薄膜捲繞核心而成;[7]一種薄膜卷的製造方法,其係將藉由擠壓製膜法製造之如前述[1]至[6]中任一項記載之聚乙烯醇薄膜捲繞核心。 That is, the present invention relates to: [1] a polyvinyl alcohol film comprising polyvinyl alcohol (A), a nonionic surfactant (B), an anionic surfactant (C1), and a phase similar to the above-mentioned C1 Isanosulphonic acid anionic surfactant (C2) polyvinyl alcohol film; among them, the average degree of polymerization of polyvinyl alcohol (A) is 500-7000, and the degree of saponification is more than 99.0 mol%; relative to 100 parts by mass The content of polyvinyl alcohol (A), non-ionic surfactant (B), anionic surfactant (C1), and the aforementioned sulfonic acid-based anionic surfactant (C2), all of which are 0.001 to 1 mass The total mass ratio [(C1 + C2) / B] of the anionic surfactant (C1) and the sulfonic acid-based anionic surfactant (C2) to the nonionic surfactant (B) is 1 ~ 10; The mass ratio (C2 / C1) of the sulfonic acid-based anionic surfactant (C2) to the anionic surfactant (C1) is 0.1 to 10; [2] The polymer as described in [1] above. Vinyl alcohol film, in which 100% by mass of polyvinyl alcohol (A), nonionic surfactant (B), anionic surfactant (C1), and the aforementioned sulfonic acid anion boundary The total content (B + C1 + C2) of the active agent (C2) is 0.1 to 1 part by mass; [3] The polyvinyl alcohol film described in the above [1] or [2], further containing a plasticizer (D), The content of the plasticizer (D) is 1 to 20 parts by mass based on 100 parts by mass of the polyvinyl alcohol (A); [4] The polyvinyl alcohol film described in any one of the above [1] to [3], The thickness of the film is 10 to 80 μm; [5] The polyvinyl alcohol film described in any one of the above [1] to [4], wherein the film width is 3 m or more; [6] a film roll, which is the aforementioned [ [1] to [5] The polyvinyl alcohol film described in any one of the cores is wound; [7] A method for manufacturing a film roll, which will be manufactured by the extrusion film method as described in [1] to [6] The polyvinyl alcohol film wound core according to any one of the above.

本發明之PVA薄膜,由於薄膜表面之缺點少,成為偏光板性能降低之原因之來自存在於薄膜內部之活性劑的凝集物少,透明性優良。因此,藉由使用該PVA薄膜作為原始材料,可得到透明性高之光學薄膜,尤其偏光薄膜。 Since the PVA film of the present invention has few defects on the surface of the film, it is the reason why the performance of the polarizing plate is reduced that there is less agglomerate from the active agent existing inside the film, and the transparency is excellent. Therefore, by using this PVA film as a raw material, an optical film with high transparency, especially a polarizing film, can be obtained.

用於實施發明之形態Forms for implementing the invention

本發明之PVA薄膜係由含有PVA(A)、非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及與前述C1相異之磺酸系陰離子性界面活性劑(C2)的樹脂組成物所構成。 The PVA film of the present invention is made of PVA (A), non-ionic surfactant (B), anionic surfactant (C1), and a sulfonic acid-based anionic surfactant (C2) different from the aforementioned C1. Consists of a resin composition.

就PVA(A)而言,可使用藉由將乙烯酯聚合所得到之乙烯酯系聚合物皂化而製造者。就乙烯酯而言,例如,可列舉甲酸乙烯酯、乙酸乙烯酯、丙酸乙烯酯、戊酸乙烯酯、月桂酸乙烯酯、硬脂酸乙烯酯、苯甲酸乙烯酯、三甲基乙酸乙烯酯、新癸酸乙烯酯等。此等可單獨使用1種,亦可將2種以上併用,而以前者為較 佳。從取得性、成本、PVA(A)之生產性等的觀點,就乙烯酯而言,以乙酸乙烯酯為較佳。 The PVA (A) can be produced by saponifying a vinyl ester polymer obtained by polymerizing a vinyl ester. Examples of vinyl esters include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl laurate, vinyl stearate, vinyl benzoate, and trimethyl vinyl acetate. , Vinyl neodecanoate, etc. These may be used singly or in combination of two or more, and the former is more preferable. From the viewpoints of availability, cost, productivity of PVA (A), etc., vinyl acetate is preferably vinyl acetate.

就可與乙烯酯共聚合之其他單體而言,例如,可列舉乙烯;丙烯、1-丁烯、異丁烯等碳數3~30之烯烴;丙烯酸或其鹽;丙烯酸甲酯、丙烯酸乙酯、丙烯酸正丙酯、丙烯酸異丙酯、丙烯酸正丁酯、丙烯酸異丁酯、丙烯酸三級丁酯、丙烯酸2-乙基己酯、丙烯酸十二酯、丙烯酸十八酯等丙烯酸酯;甲基丙烯酸或其鹽;甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸正丙酯、甲基丙烯酸異丙酯、甲基丙烯酸正丁酯、甲基丙烯酸異丁酯、甲基丙烯酸三級丁酯、甲基丙烯酸2-乙基己酯、甲基丙烯酸十二酯、甲基丙烯酸十八酯等甲基丙烯酸酯;丙烯醯胺、N-甲基丙烯醯胺、N-乙基丙烯醯胺、N,N-二甲基丙烯醯胺、二丙酮丙烯醯胺、丙烯醯胺丙磺酸或其鹽、丙烯醯胺丙基二甲基胺或其鹽、N-羥甲基丙烯醯胺或其衍生物等丙烯醯胺衍生物;甲基丙烯醯胺、N-甲基甲基丙烯醯胺、N-乙基甲基丙烯醯胺、甲基丙烯醯胺丙磺酸或其鹽、甲基丙烯醯胺丙基二甲基胺或其鹽、N-羥甲基甲基丙烯醯胺或其衍生物等甲基丙烯醯胺衍生物;N-乙烯基甲醯胺、N-乙烯基乙醯胺、N-乙烯基吡咯啶酮等N-乙烯基醯胺;甲基乙烯基醚、乙基乙烯基醚、正丙基乙烯基醚、異丙基乙烯基醚、正丁基乙烯基醚、異丁基乙烯基醚、三級丁基乙烯基醚、十二基乙烯基醚、硬脂基乙烯基醚等乙烯基醚;丙烯腈、甲基丙烯腈等之氰化乙烯基;氯乙烯、偏二氯乙烯、氟乙烯、偏二氟乙 烯等鹵化乙烯基;乙酸烯丙酯、烯丙基氯等烯丙基化合物;馬來酸或其鹽、酯或酸酐;伊康酸或其鹽、酯或酸酐;乙烯基三甲氧基矽烷等乙烯基矽基化合物;乙酸異丙烯酯等。此等其他單體,可單獨使用1種,亦可將2種以上併用。其中,就其他單體而言,以乙烯及碳數3~30之烯烴為較佳,以乙烯為更佳。 As for other monomers copolymerizable with vinyl esters, for example, ethylene; olefins having 3 to 30 carbon atoms such as propylene, 1-butene, and isobutylene; acrylic acid or a salt thereof; methyl acrylate, ethyl acrylate, Acrylic esters such as n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tertiary butyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, and octadecyl acrylate; methacrylic acid Or its salts; methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tertiary butyl methacrylate Esters, methacrylic acid esters such as 2-ethylhexyl methacrylate, dodecyl methacrylate, and octadecyl methacrylate; acrylamide, N-methacrylamide, N-ethylacrylamide , N, N-dimethyl acrylamide, diacetone acrylamide, acrylamide propanesulfonic acid or a salt thereof, acrylamide propyl dimethylamine or a salt thereof, N-hydroxymethyl acrylamide or Derivatives such as acrylamide; methacrylamide, N-methacrylamide , N-ethyl methacrylamide, methacrylamine propanesulfonic acid or its salt, methacrylamide propyldimethylamine or its salt, N-methylolmethacrylamide or its salt Derivatives such as methacrylamide; N-vinylamines such as N-vinylformamide, N-vinylacetamide, N-vinylpyrrolidone; methyl vinyl ether, ethyl Vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, tertiary butyl vinyl ether, dodecyl vinyl ether, stearyl Vinyl ethers such as vinyl ether; vinyl cyanide vinyls such as acrylonitrile and methacrylonitrile; halogenated vinyls such as vinyl chloride, vinylidene chloride, vinyl fluoride, vinylidene fluoride; allyl acetate, allyl Allyl compounds such as chlorine; maleic acid or its salt, ester, or anhydride; itaconic acid or its salt, ester, or anhydride; vinyl silicon compounds such as vinyltrimethoxysilane; isopropenyl acetate and the like. These other monomers may be used singly or in combination of two or more kinds. Among other monomers, ethylene and olefins having 3 to 30 carbon atoms are preferred, and ethylene is more preferred.

前述乙烯酯系聚合物中所佔的來自上述其他單體之構造單元的比率係無特別限制,然而基於構成乙烯酯系聚合物的全部構造單元之莫耳數,以15莫耳%以下為較佳,以5莫耳%以下為更佳。 The ratio of the structural units derived from the other monomers in the vinyl ester polymer is not particularly limited. However, based on the molar number of all the structural units constituting the vinyl ester polymer, 15 mol% or less is preferred. Preferably, it is more preferably 5 mol% or less.

對於PVA(A)之聚合度未必加以限制,然而由於隨著聚合度下降,有薄膜強度降低之傾向,以200以上為較佳,更佳為300以上,進一步更佳為400以上,特佳為500以上。又,若聚合度過高,則由於水溶液或熔融之PVA(A)的黏度變高,有製膜變難之傾向,以10,000以下為較佳,更佳為9,000以下,進一步更佳為8,000以下,特佳為7,000以下。此處,所謂的PVA(A)之聚合度,意指以JIS K6726-1994之記載為基準所測定的平均聚合度,將PVA(A)再皂化,精製後,從於30℃之水中測定的極限黏度[η](單位:公合/g)藉由下式求得。 The degree of polymerization of PVA (A) is not necessarily limited, but as the degree of polymerization decreases, the strength of the film tends to decrease, preferably 200 or more, more preferably 300 or more, even more preferably 400 or more, and particularly preferably 500 or more. If the degree of polymerization is too high, the viscosity of the aqueous solution or the molten PVA (A) tends to be high, and film formation tends to be difficult. It is preferably 10,000 or less, more preferably 9,000 or less, and even more preferably 8,000 or less. The best is below 7,000. Here, the degree of polymerization of PVA (A) means an average degree of polymerization measured based on the description in JIS K6726-1994. PVA (A) is resaponified and purified, and then measured from water at 30 ° C. The limiting viscosity [η] (unit: metric / g) is obtained by the following formula.

聚合度=([η]×103/8.29)(1/0.62) Degree of polymerization = ([η] × 10 3 /8.29) (1 / 0.62)

PVA(A)之皂化度無特別限制,可使用例如60莫耳%以上之PVA(A),然而在使用PVA薄膜作為偏光薄膜等光學薄膜製造用之原料薄膜的情況等,PVA(A)之皂化度以95莫耳%以上為較佳,以98莫耳%以上為更 佳,以99莫耳%以上為進一步更佳。此處,所謂的PVA(A)之皂化度,意指相對於PVA(A)所具有的能藉由皂化轉化為乙烯醇單元之構造單元(典型而言,乙烯酯系單體單位)與乙烯醇單元之合計莫耳數,該乙烯醇單元之莫耳數所佔的比率(莫耳%)。PVA(A)之皂化度可依JIS K6726-1994之記載為基準進行測定。 The degree of saponification of PVA (A) is not particularly limited. For example, PVA (A) of 60 mol% or more can be used. However, in the case of using a PVA film as a raw material film for the manufacture of optical films such as polarizing films, etc. The saponification degree is preferably 95 mol% or more, more preferably 98 mol% or more, and more preferably 99 mol% or more. Here, the so-called saponification degree of PVA (A) refers to a structural unit (typically, a vinyl ester-based monomer unit) and ethylene which are converted to a vinyl alcohol unit by saponification with respect to PVA (A). The total molar number of alcohol units is the ratio of the molar number of the vinyl alcohol units (mole%). The degree of saponification of PVA (A) can be measured in accordance with the description in JIS K6726-1994.

PVA(A)可單獨使用1種PVA,亦可將聚合度、皂化度、改質度等相異的2種以上PVA併用。但是,PVA薄膜若含有具有羧基、磺酸基等酸性官能基之PVA;具有酸酐基之PVA;具有胺基等鹼性官能基之PVA;具有此等之中和物等促進交聯反應之官能基的PVA,則有藉由PVA分子間之交聯反應,該PVA薄膜之二次加工性降低的情況。因此,如光學薄膜製造用之原始薄膜,在尋求優良二次加工性之情況,PVA(A)中的具有酸性官能基之PVA、具有酸酐基之PVA、具有鹼性官能基之PVA及此等之中和物的含量,以分別為0.1質量%以下為較佳,以任一項均不含為更佳。 The PVA (A) may be used alone or in combination of two or more PVA having different degrees of polymerization, saponification, and modification. However, if the PVA film contains PVA with acidic functional groups such as carboxyl group and sulfonic acid group; PVA with acid anhydride group; PVA with basic functional group such as amine group; and functions with these neutralizers to promote crosslinking reaction Based on the PVA, the secondary processability of the PVA film may be reduced by a cross-linking reaction between PVA molecules. Therefore, if the original thin film used in the manufacture of optical films is seeking excellent secondary processability, PVA (A) has PVA having an acidic functional group, PVA having an acid anhydride group, PVA having a basic functional group, and the like. The content of the neutralizer is preferably 0.1% by mass or less, and it is more preferable that none of them is contained.

前述樹脂組成物中的PVA(A)之含有率,以50質量%以上為較佳,以70質量%以上為更佳,以85質量%以上為進一步更佳。 The content of PVA (A) in the resin composition is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 85% by mass or more.

就本發明中所用之非離子性界面活性劑(B)而言,例如,可列舉聚氧伸乙基油基醚等烷基醚型;聚氧伸乙基辛基苯基醚等烷基苯基醚型;聚氧伸乙基月桂酸酯等烷基酯型;聚氧伸乙基月桂基胺基醚等烷基胺型;聚氧伸乙基月桂醯胺等烷基醯胺型;聚氧伸乙基聚 氧伸丙基醚等聚丙二醇醚型;月桂酸二乙醇醯胺、油酸二乙醇醯胺等烷醇醯胺型;聚氧伸烷基烯丙基苯基醚等烯丙基苯基醚型等。此等可單獨使用1種,亦可將2種以上併用。 Examples of the nonionic surfactant (B) used in the present invention include alkyl ethers such as polyoxyethyl oleyl ether; and alkyl benzenes such as polyoxy ethyl octyl phenyl ether. Ether type; alkyl ester types such as polyoxyethyl lauryl ester; alkyl amine types such as polyoxyethyl lauryl amino ether; alkyl amine types such as polyoxyethyl laurylamine; poly Polypropylene glycol ether types such as oxyethyl polyoxypropyl ether; alkanolamine types such as diethanol amine laurate and diethanol amine oleate; allyl groups such as polyoxyalkylene allylphenyl ether Phenyl ether type and so on. These can be used alone or in combination of two or more.

非離子性界面活性劑(B),以包含具有碳數9以上之烷基鏈(烷基)的非離子性界面活性劑為較佳。此種非離子性界面活性劑容易於PVA薄膜內凝集,易使PVA薄膜之透明性惡化。與其相對地,本發明中,藉由將具有碳數9以上之烷基鏈(烷基)的非離子性界面活性劑,同時與陰離子性界面活性劑(C1)併用,可得到具有高透明性之PVA薄膜。於是,就非離子性界面活性劑(B)而言,藉由使用包含具有碳數9以上之烷基鏈的非離子性界面活性劑者,可使製膜時之條紋狀缺點的發生減低。從上述之觀點,烷基鏈之碳數(烷基鏈長)以10以上為更佳。另一方面,烷基鏈之碳數以30以下為較佳,以22以下為更佳,以16以下為進一步更佳,以12以下為特佳。前述烷基鏈可為直鏈,亦可為支鏈,而以直鏈為較佳。又,上述之烷基鏈以包含於非離子性界面活性劑(B)之主鏈部分(最長鏈)中為較佳。非離子性界面活性劑(B)中的具有前述烷基鏈之非離子性界面活性劑的含量以90質量%以上為較佳,以非離子性界面活性劑(B)實質上只含有具有前述烷基鏈之非離子性界面活性劑為更佳。 The nonionic surfactant (B) is preferably a nonionic surfactant containing an alkyl chain (alkyl group) having 9 or more carbon atoms. Such a nonionic surfactant is easy to agglomerate in a PVA film, and it is easy to deteriorate the transparency of the PVA film. In contrast, in the present invention, by using a nonionic surfactant having an alkyl chain (alkyl group) having 9 or more carbon atoms in combination with an anionic surfactant (C1), high transparency can be obtained. Of PVA film. Therefore, in the case of the nonionic surfactant (B), the use of a nonionic surfactant having an alkyl chain having a carbon number of 9 or more can reduce the occurrence of streak-like defects during film formation. From the viewpoint described above, the carbon number (alkyl chain length) of the alkyl chain is more preferably 10 or more. On the other hand, the carbon number of the alkyl chain is preferably 30 or less, more preferably 22 or less, even more preferably 16 or less, and particularly preferably 12 or less. The aforementioned alkyl chain may be a straight chain or a branched chain, and a straight chain is preferred. The above-mentioned alkyl chain is preferably contained in the main chain portion (longest chain) of the nonionic surfactant (B). The content of the nonionic surfactant having the aforementioned alkyl chain in the nonionic surfactant (B) is preferably 90% by mass or more. The nonionic surfactant (B) substantially contains only Non-ionic surfactants of the alkyl chain are more preferred.

又,具有前述之烷基鏈的非離子性界面活性劑(B),以包含烷醇醯胺型之非離子性界面活性劑為較 佳,以包含脂肪酸之二烷醇醯胺為更佳。非離子系界面活性劑(B)中的烷醇醯胺型之非離子系界面活性劑之含量,以90質量%以上為較佳,以非離子性界面活性劑(B)實質上只含有烷醇醯胺型之非離子性界面活性劑為特佳。 The nonionic surfactant (B) having the aforementioned alkyl chain is preferably a nonionic surfactant containing an alkanolamine type, and more preferably a dialkanolamine containing a fatty acid. The content of the alkanolamine type nonionic surfactant in the nonionic surfactant (B) is preferably 90% by mass or more, and the nonionic surfactant (B) contains substantially only an alkane Alcoholamine type nonionic surfactants are particularly preferred.

就本發明中所用之陰離子性界面活性劑(C1)而言,例如,可列舉椰子油脂肪酸三乙醇胺、月桂酸三乙醇胺、月桂醯基肌胺酸鈉、椰子油脂肪酸肌胺酸鈉、椰子油脂肪酸肌胺酸三乙醇胺等羧酸型;月桂基硫酸鈉、月桂基硫酸銨、月桂基硫酸三乙醇胺、聚氧伸乙基月桂基醚硫酸鈉、聚氧伸乙基烷基(12,13)醚硫酸鈉、聚氧伸乙基烷基醚硫酸鹽、聚氧伸乙基月桂基醚硫酸鈉、聚氧伸乙基椰子油脂肪酸單乙醇醯胺硫酸鈉等硫酸酯型;月桂基磷酸、聚氧伸乙基月桂基醚磷酸、聚氧伸乙基油基醚磷酸、聚氧伸乙基油基醚磷酸鈉、聚氧伸乙基硬脂基醚磷酸、聚氧伸乙基烷基(12~15)醚磷酸等磷酸酯型;烷基苯磺酸鈉、烷基磺酸鈉、烷基萘磺酸鈉、萘磺酸鈉、二苯基醚磺酸鈉、十二基苯磺酸三乙醇胺、磺酸基琥珀酸二辛酯、聚氧伸乙基磺酸基琥珀酸月桂基二鈉、磺酸基琥珀酸月桂基二鈉、聚氧伸乙基烷基(12~14)磺酸基琥珀酸二鈉、椰子油脂肪酸甲基牛磺酸鈉、椰子油脂肪酸甲基牛磺酸鈉、椰子油脂肪酸牛磺酸鈉等磺酸型。此等可只單獨使用1種陰離子系界面活性劑,亦可將2種以上陰離子系界面活性劑併用。 Examples of the anionic surfactant (C1) used in the present invention include coconut oil fatty acid triethanolamine, lauric triethanolamine, sodium lauryl sarcosinate, coconut oil fatty sarcosinate, and coconut oil. Fatty acid carnosine triethanolamine and other carboxylic acid types; sodium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium polyoxylauryl ether sulfate, and polyoxyethyl alkyl (12,13) Sodium ether sulfate, polyoxyethyl ether ether sulfate, polyoxyethyl lauryl ether sodium sulfate, polyoxyethylene ethyl coconut oil fatty acid monoethanolamine sodium sulfate and other sulfate types; lauryl phosphoric acid, poly Oxyethyl lauryl ether phosphate, polyoxyethyl oleyl ether phosphate, polyoxyethyl oleyl ether sodium phosphate, polyoxyethyl stearyl ether phosphate, polyoxyethyl alkyl (12 ~ 15) Phosphate types such as ether phosphoric acid; sodium alkylbenzenesulfonate, sodium alkylsulfonate, sodium alkylnaphthalenesulfonate, sodium naphthalenesulfonate, sodium diphenylethersulfonate, dodecylbenzenesulfonic acid Ethanolamine, dioctyl sulfosuccinate, disodium lauryl sulfosuccinate, sulfosuccinate Disodium lauryl, polyoxyalkylene (12-14) disodium succinate, sodium coconut fatty acid methyl taurate, coconut fatty acid sodium methyl taurine, coconut oil fatty acid taurine Sulfuric acid type such as sodium. In these cases, only one kind of anionic surfactant may be used alone, or two or more kinds of anionic surfactants may be used in combination.

陰離子性界面活性劑(C1)以包含具有碳數9以上之烷基鏈(烷基)的陰離子性界面活性劑為較佳。此種陰離子性界面活性劑由於有使非離子性界面活性劑(B)分散之效果,且成為液滴產生原因之活性劑的凝集物變得難以產生,而形成更透明之薄膜。再者,與非離子性界面活性劑(B)同樣地,陰離子性界面活性劑(C1)若包含具有碳數9以上之烷基鏈的陰離子性界面活性劑,則製膜時的條紋狀缺點之發生會進一步減低。從如上述之觀點,上述烷基鏈之碳數(烷基鏈長)以10以上為更佳。另一方面,上述烷基鏈之碳數以30以下為較佳,以22以下為更佳,以16以下為進一步更佳,以12以下為特佳。上述之烷基鏈可為直鏈,亦可為支鏈,然而以直鏈為較佳。又,上述之烷基鏈以包含於陰離子性界面活性劑(C1)之主鏈部分(最長鏈)中為較佳。陰離子性界面活性劑(C1)中,具有前述烷基鏈之陰離子性界面活性劑之含量,以90質量%以上為較佳,以陰離子性界面活性劑(C1)實質上只含有具有前述烷基鏈之陰離子性界面活性劑為更佳。 The anionic surfactant (C1) is preferably an anionic surfactant including an alkyl chain (alkyl) having 9 or more carbon atoms. Such an anionic surfactant has the effect of dispersing the nonionic surfactant (B), and it is difficult to generate an aggregate of the active agent that is the cause of the droplet generation, thereby forming a more transparent film. In addition, as with the nonionic surfactant (B), if the anionic surfactant (C1) contains an anionic surfactant having an alkyl chain having 9 or more carbon atoms, it has a stripe-like defect during film formation. The occurrence will be further reduced. From the viewpoint described above, the carbon number (alkyl chain length) of the alkyl chain is more preferably 10 or more. On the other hand, the carbon number of the alkyl chain is preferably 30 or less, more preferably 22 or less, even more preferably 16 or less, and particularly preferably 12 or less. The above-mentioned alkyl chain may be a straight chain or a branched chain, but a straight chain is preferred. The above-mentioned alkyl chain is preferably contained in the main chain portion (longest chain) of the anionic surfactant (C1). The content of the anionic surfactant having the aforementioned alkyl chain in the anionic surfactant (C1) is preferably 90% by mass or more. The anionic surfactant (C1) substantially contains only the alkyl group having the aforementioned alkyl group. Chain anionic surfactants are more preferred.

具有前述之烷基鏈的陰離子性界面活性劑(C1),以含有硫酸酯型之陰離子性界面活性劑為較佳。陰離子性界面活性劑(C1)中的硫酸酯型之陰離子性界面活性劑之含量,以90質量%以上為較佳,以陰離子性界面活性劑(C1)實質上只含有硫酸酯型之陰離子系界面活性劑為特佳。 The anionic surfactant (C1) having the aforementioned alkyl chain is preferably a sulfate-containing anionic surfactant. The content of the sulfate-type anionic surfactant in the anionic surfactant (C1) is preferably 90% by mass or more, and the anionic surfactant (C1) substantially contains only a sulfate-based anionic system. Surfactants are particularly preferred.

本發明中所用的與前述C1相異之磺酸系陰離子性界面活性劑(C2),例如,可列舉烷基苯磺酸鈉、烷基磺酸鈉、烷基萘磺酸鈉、萘磺酸鈉、二苯基醚磺酸鈉、十二基苯磺酸三乙醇胺、磺酸基琥珀酸二辛酯、聚氧伸乙基磺酸基琥珀酸月桂酯二鈉、磺酸基琥珀酸月桂酯二鈉、聚氧伸乙基烷基(12~14)磺酸基琥珀酸二鈉、椰子油脂肪酸甲基牛磺酸鈉、椰子油脂肪酸甲基牛磺酸鈉、椰子油脂肪酸牛磺酸鈉等磺酸型。此等可只單獨使用1種陰離子系界面活性劑,亦可將2種以上之陰離子系界面活性劑併用。 Examples of the sulfonic acid-based anionic surfactant (C2) different from C1 used in the present invention include sodium alkylbenzenesulfonate, sodium alkylsulfonate, sodium alkylnaphthalenesulfonate, and naphthalenesulfonic acid. Sodium, sodium diphenyl ether sulfonate, triethanolamine dodecylbenzenesulfonate, dioctyl sulfosuccinate, disodium lauryl sulfosuccinate, lauryl sulfosuccinate Disodium, Polyoxyalkylene (12 ~ 14) Disodium succinate, Coconut oil fatty acid sodium methyl taurine, Coconut oil fatty acid sodium methyl taurine, Coconut oil fatty acid sodium taurine And so on. In these cases, only one type of anionic surfactant may be used alone, or two or more types of anionic surfactants may be used in combination.

前述磺酸系陰離子性界面活性劑(C2)以包含具有碳數9以上之烷基鏈(烷基)的磺酸系陰離子性界面活性劑為較佳。此種磺酸系陰離子性界面活性劑(C2),與陰離子性界面活性劑(C1)相比,耐熱性高,在製膜步驟中,有使非離子性界面活性劑(B)更為分散之效果,由於存在於薄膜內部的來自活性劑之凝集物變得難以產生,形成更為透明之薄膜。另一方面,磺酸系陰離子性界面活性劑(C2),係表面張力降低能力差,只有磺酸系陰離子性界面活性劑(C2)時,由於製膜時產生厚薄差異,陰離子性界面活性劑(C1)及磺酸系陰離子性界面活性劑(C2)必須為併用系統。再者,與非離子性界面活性劑(B)、陰離子性界面活性劑(C1)同樣地,磺酸系陰離子性界面活性劑(C2)若包含具有碳數9以上之烷基鏈的陰離子性界面活性劑,則製膜時條紋狀缺點之發生會進一步減低。從上述之觀點,上述烷基鏈之碳數(烷基鏈長) 以10以上為更佳。另一方面,上述烷基鏈之碳數以30以下為較佳,以22以下為更佳,以18以下為進一步更佳,以16以下為特佳。上述烷基鏈可為直鏈,亦可為支鏈,然而以直鏈為較佳。又,上述烷基鏈以包含於磺酸系陰離子性界面活性劑(C2)之主鏈部分(最長鏈)中為較佳。磺酸系陰離子性界面活性劑(C2)中,具有前述烷基鏈之陰離子性界面活性劑之含量以90質量%以上為較佳,以磺酸系陰離子性界面活性劑(C2)實質上只含有具有前述烷基鏈之陰離子性界面活性劑為更佳。 The sulfonic acid-based anionic surfactant (C2) is preferably a sulfonic acid-based anionic surfactant having an alkyl chain (alkyl) having 9 or more carbon atoms. This sulfonic acid-based anionic surfactant (C2) has higher heat resistance than the anionic surfactant (C1). In the film-forming step, the nonionic surfactant (B) is more dispersed. As a result, agglomerates from the active agent existing inside the film become difficult to generate, and a more transparent film is formed. On the other hand, the sulfonic acid-based anionic surfactant (C2) has a poor surface tension reduction ability. When only the sulfonic acid-based anionic surfactant (C2) is used, an anionic surfactant is produced due to the difference in thickness during film formation. (C1) and the sulfonic acid-based anionic surfactant (C2) must be a combined system. In addition, as with the nonionic surfactant (B) and the anionic surfactant (C1), if the sulfonic acid-based anionic surfactant (C2) contains an anionic group having an alkyl chain having 9 or more carbon atoms, Surfactants will further reduce the occurrence of streaks during film formation. From the viewpoint described above, the carbon number (alkyl chain length) of the alkyl chain is more preferably 10 or more. On the other hand, the carbon number of the alkyl chain is preferably 30 or less, more preferably 22 or less, even more preferably 18 or less, and particularly preferably 16 or less. The above-mentioned alkyl chain may be a straight chain or a branched chain, but a straight chain is preferred. The alkyl chain is preferably contained in the main chain portion (longest chain) of the sulfonic acid-based anionic surfactant (C2). In the sulfonic acid-based anionic surfactant (C2), the content of the anionic surfactant having the aforementioned alkyl chain is preferably 90% by mass or more. The sulfonic acid-based anionic surfactant (C2) is substantially only It is more preferable to contain an anionic surfactant having the aforementioned alkyl chain.

具有前述之烷基鏈的磺酸系陰離子性界面活性劑(C2),以含有烷基磺酸鹽類之陰離子性界面活性劑為較佳。磺酸系陰離子性界面活性劑(C2)中,烷基磺酸鹽類之陰離子性界面活性劑之含量以90質量%以上為較佳,以磺酸系陰離子性界面活性劑(C2)實質上只含有烷基磺酸鹽類之陰離子系界面活性劑為特佳。 The sulfonic acid-based anionic surfactant (C2) having the aforementioned alkyl chain is preferably an anionic surfactant containing an alkylsulfonic acid salt. In the sulfonic acid-based anionic surfactant (C2), the content of the anionic surfactant of the alkylsulfonic acid salt is preferably 90% by mass or more. The sulfonic acid-based anionic surfactant (C2) is substantially Anionic surfactants containing only alkyl sulfonates are particularly preferred.

前述樹脂組成物中,相對於非離子性界面活性劑(B),陰離子性界面活性劑(C1)及與前述C1相異之磺酸系陰離子性界面活性劑(C2)之合計質量比[(C1+C2)/B]必須為1~10,相對於陰離子性界面活性劑(C1),磺酸系陰離子性界面活性劑(C2)之質量比(C2/C1)必須為0.1~10。在合計質量比[(C1+C2)/B]小於1之情況,由於陰離子性界面活性劑之添加量過少,使非離子性界面活性劑分散之效果小,來自存在於薄膜內部之活性劑的凝集物產生而薄膜之透明性降低。在合計質量比[(C1+C2)/B]為10以上之情況,非離子性界面活性劑之 添加量少,膜面安定性缺乏而產生條紋狀缺點。又,在相對於陰離子性界面活性劑(C1),磺酸系陰離子性界面活性劑(C2)之質量比(C2/C1)小於0.1之情況,磺酸系陰離子性界面活性劑(C2)之添加量少,非離子性界面活性劑之分散效果變低,來自活性劑之凝集物產生而使薄膜之透明性惡化。在質量比(C2/C1)為10以上之情況,磺酸系陰離子性界面活性劑(C2)由於表面張力降低能力差,膜面安定性缺乏而產生條紋狀缺點。 In the resin composition, the total mass ratio of the nonionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) different from the above C1 [( C1 + C2) / B] must be 1-10, and the mass ratio (C2 / C1) of the sulfonic acid-based anionic surfactant (C2) to the anionic surfactant (C1) must be 0.1-10. In the case where the total mass ratio [(C1 + C2) / B] is less than 1, the effect of dispersing the nonionic surfactant is small because the amount of the anionic surfactant is too small. Aggregates are generated and the transparency of the film is reduced. When the total mass ratio [(C1 + C2) / B] is 10 or more, the addition amount of the nonionic surfactant is small, and the film surface lacks stability, resulting in a stripe-like defect. When the mass ratio (C2 / C1) of the sulfonic acid-based anionic surfactant (C2) to the anionic surfactant (C1) is less than 0.1, the amount of the sulfonic acid-based anionic surfactant (C2) is less than 0.1. When the addition amount is small, the dispersion effect of the non-ionic surfactant becomes low, and agglomerates from the active agent are generated to deteriorate the transparency of the film. When the mass ratio (C2 / C1) is 10 or more, the sulfonic acid-based anionic surfactant (C2) has poor surface tension reducing ability and lacks film surface stability, resulting in a stripe-like defect.

在前述樹脂組成物中,相對於100質量份之PVA(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及磺酸系陰離子性界面活性劑(C2)之合計含量(B+C1+C2),以0.1~1質量份為較佳。在該合計含量超過1質量份之情況,由於非離子系界面活性劑(B)、陰離子系界面活性劑(C1)或磺酸系陰離子性界面活性劑(C2)之添加量過多,於薄膜內部形成液滴,有使薄膜之透明性降低的情況。前述合計含量以0.5質量份以下為較佳,以0.3質量份以下為更佳。另一方面,在前述合計含量小於0.1質量份之情況,於所得到之PVA薄膜中,條紋狀缺點增加,同時有表面粗糙,平滑性變得不良之情況。前述合計含量以0.1質量份以上為較佳。 In the aforementioned resin composition, the total of the nonionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) with respect to 100 parts by mass of the PVA (A). The content (B + C1 + C2) is preferably 0.1 to 1 part by mass. When the total content exceeds 1 part by mass, the amount of non-ionic surfactant (B), anionic surfactant (C1), or sulfonic acid-based anionic surfactant (C2) is too much, and it is inside the film. The formation of droplets may reduce the transparency of the film. The total content is preferably 0.5 parts by mass or less, and more preferably 0.3 parts by mass or less. On the other hand, in the case where the total content is less than 0.1 parts by mass, in the obtained PVA film, streaks are increased, and at the same time, the surface is rough and the smoothness may be poor. The total content is preferably 0.1 parts by mass or more.

從可對PVA薄膜賦予柔軟性之觀點,本發明之PVA薄膜以進一步含有可塑劑(D)為較佳。就較佳之可塑劑(D)而言,可列舉多元醇,具體而言,可列舉乙二醇、甘油、丙二醇、二乙二醇、三乙二醇、四乙二醇、三羥甲基丙烷等。此等可單獨使用1種,亦可將2種以 上併用。其中,從與PVA(A)之相容性或取得性等觀點而言,以乙二醇或甘油為較佳。 From the viewpoint of imparting flexibility to the PVA film, the PVA film of the present invention preferably further contains a plasticizer (D). Preferred plasticizers (D) include polyhydric alcohols, and specific examples include ethylene glycol, glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and trimethylolpropane. Wait. These can be used alone or in combination of two or more. Among them, ethylene glycol or glycerin is preferred from the viewpoints of compatibility and availability with PVA (A).

可塑劑(D)之含量,相對於100質量份之PVA(A),以1~20質量份之範圍內為較佳。 The content of the plasticizer (D) is preferably within a range of 1 to 20 parts by mass relative to 100 parts by mass of PVA (A).

前述樹脂組成物,視需要可進一步含有PVA、界面活性劑、脂肪族單醇及可塑劑以外之其他成分。就此種其他成分而言,例如,可列舉水分、抗氧化劑、紫外線吸收劑、潤滑劑、著色劑、填充劑(無機物粒子‧澱粉等)、防腐劑、防黴劑、上述成分以外之其他高分子化合物等。前述樹脂組成物中之其他成分的含量,以10質量%以下為較佳。 The resin composition may further contain components other than PVA, a surfactant, an aliphatic monoalcohol, and a plasticizer, if necessary. Examples of such other components include moisture, antioxidants, ultraviolet absorbers, lubricants, colorants, fillers (inorganic particles, starch, etc.), preservatives, antifungal agents, and polymers other than the above components. Compounds etc. The content of the other components in the resin composition is preferably 10% by mass or less.

本發明之PVA薄膜之厚度無特別限制,可依據PVA薄膜之用途等而適宜設定,例如可設定為300μm以下。在使用本發明之PVA薄膜作為偏光薄膜等光學薄膜製造用之原始薄膜的情況,該厚度以10~80μm之範圍內為較佳。再者,PVA薄膜之厚度,可作為任意10處所測定之值的平均值而求得。 The thickness of the PVA film of the present invention is not particularly limited, and it can be appropriately set according to the application of the PVA film, for example, it can be set to 300 μm or less. In the case where the PVA film of the present invention is used as an original film for manufacturing an optical film such as a polarizing film, the thickness is preferably within a range of 10 to 80 μm. In addition, the thickness of a PVA film can be calculated as the average value of the measured values in arbitrary 10 places.

本發明之PVA薄膜之形狀無特別限制,然而從可連續而平順地製造更均勻之PVA薄膜的觀點,或在使用所得到之PVA薄膜製造光學薄膜等之情況等連續使用的觀點等而言,以長尺寸之薄膜為較佳。長尺寸之薄膜之長度(移動方向之長度)無特別限制,可依據用途等而適宜設定,例如,可設定為5~30,000m之範圍內。長尺寸之薄膜以捲繞核心等而形成薄膜卷為較佳。 The shape of the PVA film of the present invention is not particularly limited, but from the viewpoint of continuous and smooth production of a more uniform PVA film, or from the viewpoint of continuous use in the case of producing an optical film using the obtained PVA film, etc., A long film is preferred. The length (length in the moving direction) of the long-size film is not particularly limited, and can be appropriately set according to the application, for example, it can be set within a range of 5 to 30,000 m. It is preferable to form a film roll by winding a core or the like for a long film.

本發明之PVA薄膜之寬度無特別限制,例如可設為0.5m以上。近年由於尋求寬度廣大之偏光薄膜,該寬度以1m以上為較佳,以3m以上為更佳,以4.5m以上為進一步更佳,以5.0m以上為特佳,以5.5m以上為最佳。另一方面,若PVA薄膜之寬度太過寬廣,則用於製膜PVA薄膜之製膜裝置的製造費用增加,或再者,在以實用化之製造裝置製造光學薄膜的情況,由於均勻地延伸變得困難,PVA薄膜之寬度以7.5m以下為較佳,以7.0m以下為更佳,以6.5m以下為進一步更佳。 The width of the PVA film of the present invention is not particularly limited, and may be, for example, 0.5 m or more. In recent years, a polarizing film with a wide width has been sought. The width is preferably 1 m or more, more preferably 3 m or more, more preferably 4.5 m or more, particularly preferably 5.0 m or more, and most preferably 5.5 m or more. On the other hand, if the width of the PVA film is too wide, the manufacturing cost of a film forming apparatus for forming a PVA film increases, or, in the case where an optical film is manufactured with a practical manufacturing apparatus, the film is uniformly stretched. It becomes difficult, and the width of the PVA film is preferably 7.5 m or less, more preferably 7.0 m or less, and even more preferably 6.5 m or less.

若依照本發明,則可得到表面平滑性良好之PVA薄膜。PVA薄膜之表面平滑性的程度無特別限制,然而以JIS B0601:2001所規定之表面平滑性Ra為2.0μm以下為較佳,以1.5μm以下為更佳,以1.3μm以下為進一步更佳,以1.0μm以下為特佳,以0.5μm以下為最佳。依照此種方式,若藉由表面平滑性良好之PVA薄膜,則可容易地得到光透過率高,且透明性優良之光學薄膜。 According to the present invention, a PVA film having good surface smoothness can be obtained. The degree of surface smoothness of the PVA film is not particularly limited. However, the surface smoothness Ra specified in JIS B0601: 2001 is preferably 2.0 μm or less, more preferably 1.5 μm or less, and even more preferably 1.3 μm or less. It is particularly preferable that it is 1.0 μm or less, and it is most preferable that it is 0.5 μm or less. According to this method, if a PVA film having good surface smoothness is used, an optical film having high light transmittance and excellent transparency can be easily obtained.

若依照本發明,則可得到透明性良好之PVA薄膜。PVA薄膜之透明性的程度無特別限制,然而以藉由色度計規定之濁度為3.00以下為較佳,以2.00以下為進一步更佳,以1.50以下為特佳。 According to the present invention, a PVA film having good transparency can be obtained. The degree of transparency of the PVA film is not particularly limited. However, the turbidity specified by the colorimeter is preferably 3.00 or less, further preferably 2.00 or less, and even more preferably 1.50 or less.

本發明之PVA薄膜之製造方法無特別限制,例如,可使用含有PVA(A)、非離子系界面活性劑(B)、陰離子性界面活性劑(C1)、與前述C1相異之磺酸系陰離子性界面活性劑(C2)、液體介質,及視需要進一 步含有上述之可塑劑或其他成分的製膜原液,藉由流延製膜法或熔融擠壓製膜法等周知之方法製造。再者,製膜原液可為PVA(A)溶解於液體介質而形成者,亦可為PVA(A)熔融者。 The method for producing the PVA film of the present invention is not particularly limited. For example, a PVA (A), a nonionic surfactant (B), an anionic surfactant (C1), and a sulfonic acid system different from C1 can be used. The anionic surfactant (C2), a liquid medium, and a film-forming dope further containing the above-mentioned plasticizer or other components, if necessary, are produced by a known method such as a cast film method or a melt extrusion film method. Furthermore, the film-forming dope may be formed by dissolving PVA (A) in a liquid medium, or may be a solution in which PVA (A) is melted.

就製膜原液中之上述液體介質而言,例如,可列舉水、二甲亞碸、二甲基甲醯胺、二甲基乙醯胺、N-甲基吡咯啶酮、乙二醇、甘油、丙二醇、二乙二醇、三乙二醇、四乙二醇、三羥甲基丙烷、乙二胺、二伸乙三胺等,可使用此等中之1種或2種以上。其中,從賦予環境之負荷小或回收性之觀點而言,以水為較佳。 Examples of the liquid medium in the film-forming dope include water, dimethylmethylene, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, ethylene glycol, and glycerol. , Propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, trimethylolpropane, ethylenediamine, ethylenediamine, etc., one or more of these may be used. Among them, water is preferred from the viewpoint of a small load on the environment or recyclability.

製膜原液之揮發分率(製膜時藉由揮發或蒸發而去除之液體介質等的揮發性成分於製膜原液中之含有比率),雖隨製膜方法、製膜條件等而異,然而以50~90質量%之範圍內為較佳,以55~80質量%之範圍內為更佳。藉由製膜原液之揮發分率為50質量%以上,製膜原液之黏度不會變得過高,製膜變得容易。另一方面,藉由製膜原液之揮發分率為90質量%以下,製膜原液之黏度不會變得過低,所得到之PVA薄膜之厚度均勻性提高。 The volatile content of the film-forming stock solution (the content of the volatile components in the film-forming stock solution such as the liquid medium removed by volatilization or evaporation during film-making) varies with the film-forming method and film-forming conditions, but A range of 50 to 90% by mass is preferable, and a range of 55 to 80% by mass is more preferable. When the volatile content of the film-forming dope is 50% by mass or more, the viscosity of the film-forming dope does not become too high, and film formation becomes easy. On the other hand, since the volatile content of the film-forming dope is 90% by mass or less, the viscosity of the film-forming dope does not become too low, and the thickness uniformity of the obtained PVA film is improved.

使用上述之製膜原液,製造本發明之PVA薄膜時的具體製造方法無特別限制,但例如可採用將該製膜原液流涎於金屬板、玻璃板等支持體上,並於該支持體上乾燥的流延製膜法,或將於擠壓機加熱熔融之該製膜原液吐出至金屬滾筒或金屬輸送帶等之支持體上,並於該支持體上乾燥的擠壓製膜法。其中,從可連續地製造,生產效率良好的觀點而言,以擠壓製膜法為較佳。 對於所得到之薄膜,視需要亦可藉由乾燥輥或熱風乾燥裝置進一步乾燥,或藉由熱處理裝置施行熱處理,或藉由調濕裝置進行調濕。所製造之PVA薄膜,以捲繞核心等而形成薄膜卷為較佳。又,亦可切取所製造之PVA薄膜之寬度方向的兩邊。 A specific manufacturing method for manufacturing the PVA film of the present invention using the above-mentioned film-forming stock solution is not particularly limited, but for example, the film-forming stock solution may be drooled on a support such as a metal plate or a glass plate and dried on the support. The film-casting method is an extrusion film-forming method in which the film-forming stock solution heated and melted by an extruder is discharged onto a support such as a metal roller or a metal conveyor belt, and dried on the support. Among them, from the viewpoint of continuous production and good production efficiency, the extrusion film forming method is preferable. The obtained film may be further dried by a drying roller or a hot air drying device as required, or subjected to heat treatment by a heat treatment device, or humidity controlled by a humidity control device. The produced PVA film is preferably a film roll formed by winding a core or the like. Moreover, both sides of the width direction of the produced PVA film may be cut out.

本發明之PVA薄膜可適合使用作為製造偏光薄膜、相位差薄膜、特殊集光薄膜等光學薄膜用的原料薄膜。藉由使用本發明之PVA薄膜,可得到光透過率高,且品質高之光學薄膜。又,本發明之PVA薄膜,亦可使用作為包裝材料、洗衣袋等之水溶性薄膜、製造人工大理石等時的脫模薄膜等。其中,本發明之PVA薄膜較佳被用作偏光薄膜製造用之原料薄膜。 The PVA film of the present invention can be suitably used as a raw material film for producing optical films such as a polarizing film, a retardation film, and a special light-collecting film. By using the PVA film of the present invention, an optical film with high light transmittance and high quality can be obtained. In addition, the PVA film of the present invention can also be used as a water-soluble film such as a packaging material, a laundry bag, or a release film when producing artificial marble or the like. Among them, the PVA film of the present invention is preferably used as a raw material film for manufacturing a polarizing film.

具有將前述PVA薄膜染色之步驟及延伸之步驟的偏光薄膜之製造方法為本發明之較佳實施態樣。該製造方法可進一步具有固定處理步驟、乾燥處理步驟、熱處理步驟等。染色及延伸之順序無特別限定,可在延伸處理之前進行染色處理,亦可與延伸處理同時進行染色處理,或在延伸處理之後進行染色處理。又,延伸、染色等步驟可重覆進行複數次。尤其若將延伸分為2段以上,則由於容易進行均勻之延伸,故為較佳。 The method for manufacturing a polarizing film having the steps of dyeing the PVA film and extending it is a preferred embodiment of the present invention. The manufacturing method may further include a fixed processing step, a drying processing step, a heat treatment step, and the like. The order of dyeing and stretching is not particularly limited, and the dyeing process may be performed before the stretching process, the dyeing process may be performed simultaneously with the stretching process, or the dyeing process may be performed after the stretching process. Further, the steps such as elongation and dyeing can be repeated a plurality of times. In particular, it is preferable to divide the extension into two or more stages because it is easy to perform uniform extension.

就使用於PVA薄膜之染色的染料而言,可使用碘或二色性有機染料(例如,Direct Black 17、19、154;Direct Brown 44、106、195、210、223;Direct Red 2、23、28、31、37、39、79、81、240、242、247;Direct Blue 1、15、22、78、90、98、151、168、202、236、 249、270;Direct Violet 9、12、51、98;Direct Green 1、85;Direct Yellow 8、12、44、86、87;Direct Orange 26、39、106、107等之二色性染料)等。此等染料,可使用單獨1種或將2種以上組合而使用。染色通常可藉由將PVA薄膜浸漬於含有上述染料之溶液中而進行,然而其處理條件或處理方法無特別限制。 For dyeing dyes used in PVA films, iodine or dichroic organic dyes (for example, Direct Black 17, 19, 154; Direct Brown 44, 106, 195, 210, 223; Direct Red 2, 23, 28, 31, 37, 39, 79, 81, 240, 242, 247; Direct Blue 1, 15, 22, 78, 90, 98, 151, 168, 202, 236, 249, 270; Direct Violet 9, 12, 51, 98; Direct Green 1, 85; Direct Yellow 8, 12, 44, 86, 87; Direct Orange 26, 39, 106, 107 and other dichroic dyes). These dyes can be used individually by 1 type or in combination of 2 or more types. Dyeing can usually be performed by immersing a PVA film in a solution containing the above-mentioned dye, but the processing conditions or methods are not particularly limited.

就將PVA薄膜延伸之方法而言,可列舉單軸延伸方法及雙軸延伸方法,以前者為較佳。將PVA薄膜沿移動方向(MD)等延伸之單軸延伸,可藉由濕式延伸法或乾熱延伸法之任一種進行,然而從所得到之偏光薄膜之性能及品質之安定性的觀點而言,以濕式延伸法為較佳。就濕式延伸法而言,可列舉將PVA薄膜於含有純水、添加劑或水溶性有機溶劑等各種成分之水溶液、或分散有各種成分之水分散液中延伸的方法。就藉由濕式延伸法進行之單軸延伸方法的具體例而言,可列舉在含硼酸之溫水中進行單軸延伸的方法,或在含有前述染料之溶液中或後述之固定處理浴中進行單軸延伸的方法等。又,可使用吸水後之PVA薄膜於空氣中進行單軸延伸,亦可用其他方法進行單軸延伸。 As a method of stretching the PVA film, a uniaxial stretching method and a biaxial stretching method may be mentioned, and the former is preferable. The uniaxial stretching of the PVA film in the direction of movement (MD) can be performed by either a wet stretching method or a dry heat stretching method. However, from the viewpoint of the stability of the performance and quality of the obtained polarizing film, In other words, a wet extension method is preferred. The wet stretching method includes a method of stretching a PVA film in an aqueous solution containing various components such as pure water, additives, or a water-soluble organic solvent, or an aqueous dispersion in which various components are dispersed. Specific examples of the uniaxial stretching method by the wet stretching method include a method of uniaxial stretching in boric acid-containing warm water, or a solution containing the aforementioned dye or a fixed treatment bath described later. Uniaxial extension method, etc. In addition, the PVA film after water absorption may be uniaxially stretched in air, or uniaxially stretched by other methods.

單軸延伸時之延伸溫度無特別限定,然而在濕式延伸之情況,較佳採用20~90℃,更佳採用25~70℃,進一步更佳採用30~65℃之範圍內的溫度,在乾熱延伸之情況,較佳採用50~180℃之範圍內的溫度。 The stretching temperature during uniaxial stretching is not particularly limited. However, in the case of wet stretching, it is preferably 20 to 90 ° C, more preferably 25 to 70 ° C, and even more preferably a temperature in the range of 30 to 65 ° C. In the case of dry heat extension, a temperature in the range of 50 to 180 ° C is preferably used.

單軸延伸處理之延伸倍率(在以多段進行單軸延伸之情況為合計之延伸倍率),從偏光性能之觀點而 言,以儘可能延伸直至薄膜即將切斷為止為較佳,具體而言,以4倍以上為較佳,以5倍以上為更佳,以5.5倍以上為進一步更佳。延伸倍率之上限只要薄膜不斷裂則無特別限制,然而為了進行均勻之延伸,以8.0倍以下為較佳。 For uniaxial stretching, the stretching magnification (total stretching magnification in the case of uniaxial stretching in multiple stages) is preferable from the viewpoint of polarizing performance, and it is preferable to stretch as much as possible until the film is about to be cut. Specifically, It is preferably 4 times or more, more preferably 5 times or more, and even more preferably 5.5 times or more. The upper limit of the stretching ratio is not particularly limited as long as the film is not broken, but it is preferably 8.0 times or less for uniform stretching.

偏光薄膜之製造時,為了強固染料對單軸延伸之PVA薄膜的吸附,以進行固定處理為較佳。就固定處理而言,可採用在一般添加硼酸及/或硼化合物之處理浴中浸漬PVA薄膜的方法等。此時,視需要可在處理浴中添加碘化合物。 In the manufacture of polarizing films, in order to strengthen the adsorption of the uniaxially stretched PVA film by the dye, it is better to perform a fixing treatment. As for the fixing treatment, a method of immersing a PVA film in a treatment bath in which boric acid and / or a boron compound is generally added can be adopted. At this time, an iodine compound may be added to the processing bath as necessary.

以將已進行單軸延伸處理、或單軸延伸處理及固定處理之PVA薄膜接著進行乾燥處理或熱處理為較佳。乾燥處理或熱處理之溫度,以30~150℃為較佳,以50~140℃為特佳。若溫度過低,則所得到之偏光薄膜之尺寸安定性變得容易降低。另一方面,若溫度過高,則伴隨染料之分解等,變得容易發生偏光性能之降低。 The PVA film that has been subjected to the uniaxial stretching treatment, or the uniaxial stretching treatment and the fixing treatment is preferably subjected to a drying treatment or a heat treatment. The drying or heat treatment temperature is preferably 30 to 150 ° C, and particularly preferably 50 to 140 ° C. If the temperature is too low, the dimensional stability of the obtained polarizing film tends to decrease. On the other hand, if the temperature is too high, degradation of polarization performance tends to occur with decomposition of the dye and the like.

在以上述方式所得到的偏光薄膜之兩面或單面,可貼合光學性透明,且具有機械強度之保護膜而形成偏光板。就該情況之保護膜而言,使用三乙酸纖維素(TAC)薄膜、乙酸‧丁酸纖維素(CAB)薄膜、丙烯酸系薄膜、聚酯系薄膜等。又,就用於貼合保護膜之接著劑而言,一般使用PVA系接著劑或胺基甲酸酯系接著劑等,其中,以使用PVA系接著劑為較佳。 A polarizing plate can be formed by bonding a protective film that is optically transparent and has mechanical strength to both sides or one side of the polarizing film obtained in the manner described above. As the protective film in this case, a cellulose triacetate (TAC) film, a cellulose acetate ‧ butyrate (CAB) film, an acrylic film, a polyester film, or the like is used. In addition, as an adhesive for bonding a protective film, a PVA-based adhesive, a urethane-based adhesive, or the like is generally used, and among them, a PVA-based adhesive is preferably used.

如上述之方式所得到的偏光板,被覆丙烯酸系等黏著劑後,貼合於玻璃基板而可使用作為液晶顯 示器裝置之零件。將偏光板貼合在玻璃基板上時,亦可同時貼合相位差薄膜、視角提高薄膜、亮度提高薄膜等。 The polarizing plate obtained as described above can be used as a component of a liquid crystal display device after it is coated with an adhesive such as acrylic and then bonded to a glass substrate. When a polarizing plate is bonded to a glass substrate, a retardation film, a viewing angle-improving film, a brightness-improving film, and the like can also be bonded at the same time.

[實施例]     [Example]    

以下,將本發明藉由實施例等具體說明,然而本發明不受此等實施例任何限定。 Hereinafter, the present invention will be specifically described by examples and the like, but the present invention is not limited in any way by these examples.

[面粗糙狀缺點之評價方法]     [Evaluation method of rough surface defects]    

面粗糙狀缺點為沿製膜時之移動方向(MD方向)連續地發生凹凸之缺點,使用光源,使透過薄膜面之光投影至白色牆壁時,可確認斑駁狀的MD方向之明暗模樣。有面粗糙狀缺點之薄膜係表面之凹部分與凸部分之高低差為0.2μm以上,就前述斑駁狀之明暗模樣而言能明確地目視辨認。將前述明暗模樣可明確地目視辨認者視為前述高低差為0.2μm以上之面粗糙狀缺點,藉由以下之方法,以目視進行觀察評價。具體而言,將從實施例或比較例所得到之PVA薄膜切出的樣本片,以MD方向成為上下之方式吊掛,在距薄膜面350cm之位置,於薄膜面上設置具有530-580勒克斯(lux)之照度的S-ONE股份有限公司製鹵素燈光源,對薄膜面垂直地投射光線。繼而,使透過薄膜之光投影至距薄膜10cm之白色牆壁時,將觀察到的明暗模樣沿長度方向連續存在10m以上者,評價為面粗糙狀缺點,並依照以下之基準判定。 The rough surface defect is a defect in which unevenness occurs continuously along the moving direction (MD direction) during film formation. When a light source is used to project light transmitted through the film surface onto a white wall, the mottled MD direction light and dark pattern can be confirmed. The film with a rough surface defect has a height difference between the concave portion and the convex portion of the surface of 0.2 μm or more, which can be clearly visually recognized in terms of the mottled light and dark pattern. A person who can clearly visually recognize the light and dark pattern is regarded as a surface-rough defect having a height difference of 0.2 μm or more. The following methods are used to visually observe and evaluate. Specifically, the sample piece cut out from the PVA film obtained in the example or the comparative example is hung so that the MD direction becomes up and down, and a distance of 530-580 lux is set on the film surface at a distance of 350 cm from the film surface. (lux) illuminance halogen lamp light source manufactured by S-ONE Co., Ltd. Projects light perpendicularly to the film surface. Then, when the light transmitted through the film was projected onto a white wall 10 cm away from the film, the observed light and dark pattern continuously existed for more than 10 m in the length direction, and it was evaluated as a rough surface defect, and judged according to the following criteria.

◎:面粗糙狀缺點在寬方向只有小於1成之比率 ◎: Rough surface defect has a ratio of less than 10% in the width direction

○:面粗糙狀缺點在寬方向以1成以上且小於5成之比率存在 ○: Rough surface defects exist in the width direction at a ratio of 10% or more and less than 50%

△:面粗糙狀缺點在寬方向以5成以上且小於8成之比率存在 △: Rough surface defects exist in the width direction at a ratio of 50% or more and less than 80%

×:面粗糙狀缺點在寬方向以8成以上之比率存在 ×: Rough surface defects have a ratio of 80% or more in the width direction

[條紋狀缺點之評價方法]     [Evaluation method of striped defects]    

條紋狀缺點為沿製膜時之移動方向(MD方向)可見到連續1條線之缺點,使用光源,使透過薄膜面之光投影至白色牆壁時,可確認沿MD方向連續的線狀之明模樣或暗模樣。有條紋狀缺點之薄膜係表面之凹部分或凸部分之高低差為0.2μm以上,就前述線狀之明模樣或暗模樣而言可明確地目視辨認。將前述明模樣或暗模樣可明確地目視辨認者視為前述高低差為0.2μm以上之條紋狀缺點。再者,以與觀察評價前述面粗糙狀缺點之方法同樣之方式,觀察評價條紋狀缺點。再者,將本案中前述明模樣或暗模樣沿移動方向連續存在10m以上者算為條紋狀缺點,並依照以下之基準判定。 The stripe defect is a defect in which one continuous line can be seen along the moving direction (MD direction) during film formation. When a light source is used to project the light transmitted through the film surface onto a white wall, the continuous line shape in the MD direction can be confirmed. Appearance or dark appearance. The difference between the height of the concave part or convex part of the surface of the film having the streak-like defect is 0.2 μm or more, and it can be clearly visually recognized in terms of the aforementioned linear bright or dark pattern. Those who see the bright or dark patterns clearly can be regarded as the stripe-shaped defects whose height difference is 0.2 μm or more. Furthermore, in the same manner as the method for observing and evaluating the aforementioned surface-rough defects, the streak-like defects were observed and evaluated. Furthermore, the above-mentioned bright pattern or dark pattern in the present case which has a continuous presence of more than 10m in the moving direction is regarded as a stripe-shaped defect, and is determined according to the following criteria.

◎:無條紋狀缺點 ◎: No streak-like defects

○:條紋狀缺點在寬度方向存在1條 ○: One stripe defect exists in the width direction

△:條紋狀缺點在寬度方向存在2條 △: Two stripe defects exist in the width direction

×:條紋狀缺點在寬度方向存在3條以上 ×: Three or more stripe-shaped defects exist in the width direction

[來自活性劑之凝集物之測定方法]     [Determination method of aggregates from active agents]    

從以下之實施例所得到之PVA薄膜,採集1cm×1cm之樣本。來自存在於薄膜內部之活性劑的凝集物之測定,係使用Nikon股份有限公司製之相位差顯微鏡 「ECLIPSE80i」,計測來自存在於薄膜內之活性劑的凝集物。將倍率調成1000倍,將1處測定點於厚度方向分割為5分區,觀察每1分區上來自存在於薄膜內部之活性劑的凝集物的個數及大小,算出每種大小之個數平均值。將其以寬長度方向5等分之位置的5點測定,關於將該5點平均之值,依照以下之基準評價。 From the PVA film obtained in the following examples, a 1 cm × 1 cm sample was collected. The agglutinate derived from the active agent present in the film was measured using a phase difference microscope "ECLIPSE80i" manufactured by Nikon Corporation, and the agglutinate derived from the active agent present in the film was measured. The magnification was adjusted to 1000 times, and one measurement point was divided into 5 sections in the thickness direction. The number and size of aggregates from the active agent existing in the film on each section were observed, and the average number of each size was calculated. value. The measurement was performed at five points at five points in the widthwise direction, and the average of the five points was evaluated according to the following criteria.

◎:1.2μm以上大小之液滴平均存在2個以下 ◎: An average of 2 or less droplets having a size of 1.2 μm or more exist

○:1.2μm以上大小之液滴平均存在多於2個且為5個以下 ○: On average, there are more than 2 and 5 or less droplets having a size of 1.2 μm or more.

△:1.2μm以上大小之液滴平均存在多於5個且為10個以下 △: There are more than 5 and less than 10 droplets with an average size of 1.2 μm or more

×:1.2μm以上大小之液滴平均存在多於10個 ×: On average, more than 10 droplets having a size of 1.2 μm or more exist

實施例1     Example 1    

就PVA(A)而言,使用聚合度2400、皂化度99.9莫耳%之PVA(乙酸乙烯酯之單獨聚合物的皂化物)之片粒。將100質量份之該PVA之片粒浸漬於2500質量份之35℃蒸餾水中24小時後,進行離心脫水,得到PVA含水片粒。所得到之PVA含水片粒中之揮發分率為70質量%。相對於333質量份之該PVA含水片粒(乾燥狀態之PVA為100質量份),將12質量份之甘油,0.04質量份之為非離子性界面活性劑(B)的月桂酸二乙醇醯胺,0.1質量份之為陰離子性界面活性劑(C1)的月桂基硫酸鈉,0.1質量份之為磺酸系陰離子性界面活性劑(C2)的烷基磺酸鈉混合後,將所得到之混合物以單軸擠壓機加熱熔融(最高溫度130℃),形成製膜原液。 For PVA (A), tablets having a degree of polymerization of 2400 and a degree of saponification of 99.9 mol% of PVA (saponification of a separate polymer of vinyl acetate) were used. 100 parts by mass of the PVA pellets were immersed in 2500 parts by mass of 35 ° C distilled water for 24 hours, and then centrifuged to dehydrate to obtain PVA hydrous tablets. The volatile content in the obtained PVA water-containing tablets was 70% by mass. With respect to 333 parts by mass of the PVA water-containing tablets (100 parts by mass of PVA in a dry state), 12 parts by mass of glycerin and 0.04 parts by mass of non-ionic surfactant (B) laurate diethanolamine 0.1 parts by mass of sodium lauryl sulfate as an anionic surfactant (C1), and 0.1 parts by mass of sodium alkylsulfonate as a sulfonic acid-based anionic surfactant (C2), the resulting mixture was mixed It was heated and melted with a uniaxial extruder (maximum temperature: 130 ° C) to form a film forming solution.

將該製膜原液以熱交換器冷卻至100℃後,從390cm寬度之衣架型模頭吐出至表面溫度為90℃之滾筒上,進行擠壓製膜。進一步使用熱風乾燥裝置乾燥,繼而,藉由切掉因製膜時之內縮(neck-in)而變厚的薄膜兩邊,連續地製造膜厚60μm、寬度300cm之PVA薄膜。將所製造之PVA薄膜中的長度10000m部分,捲繞在圓筒狀之核心上而形成薄膜卷。關於所得到之PVA薄膜,將依照上述之方法評價面粗糙狀缺點、條紋狀缺點及液滴的結果示於表1。 This film-forming stock solution was cooled to 100 ° C. by a heat exchanger, and then discharged from a hanger-type die having a width of 390 cm onto a roller having a surface temperature of 90 ° C. to perform film extrusion. The film was further dried using a hot-air drying device, and then both sides of the film thickened due to neck-in during film formation were cut to continuously produce a PVA film having a film thickness of 60 μm and a width of 300 cm. A 10,000 m length portion of the produced PVA film was wound around a cylindrical core to form a film roll. About the obtained PVA film, the results of evaluating the surface roughness defect, the streak defect, and the droplet according to the method described above are shown in Table 1.

實施例2~5、比較例1~6     Examples 2 to 5, Comparative Examples 1 to 6    

除將非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及磺酸系陰離子性界面活性劑(C2)的使用量如表1所示地變更以外,以與實施例1同樣之方式,進行PVA薄膜(及薄膜卷)之製造及評價。將結果示於表1。再者,比較例3之薄膜由於表面性顯著較差,可藉由目視確認,因此省略面粗糙狀缺點之評價。 Except that the usage amounts of the nonionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) were changed as shown in Table 1, it was the same as in Example 1. In this way, production and evaluation of PVA film (and film roll) were performed. The results are shown in Table 1. In addition, since the film of Comparative Example 3 had significantly poor surface properties and could be visually confirmed, the evaluation of the surface roughness-like defects was omitted.

如表1所示,相對於100質量份之PVA(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及磺酸系陰離子性界面活性劑(C2)分別為0.001~1質量份,彼等之質量比[(C1+C2)/B]為1~10之範圍,磺酸系陰離子性界面活性劑(C2)相對於陰離子性界面活性劑(C1)之質量比(C2/C1)為0.1~10之範圍的實施例1~3係面粗糙狀缺點、條紋狀缺點少,且有1.2μm以上之大小的大活性劑凝集物亦少。又,質量比[(C1+C2)/B]超出1~10之範圍外的PVA薄膜(比較例3~6)係面粗糙狀缺點及條紋狀缺點、或活性劑凝集物之評價中,至少有一項較差。再者,合計含量(B+C1+C2)超出0.1~1質量份外之PVA薄膜(比較例4~6)係在任一例中來自存在於薄膜內部之活性劑的凝集物皆多,薄膜之透明性降低。 As shown in Table 1, the non-ionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) were 0.001 with respect to 100 parts by mass of the PVA (A). ~ 1 part by mass, their mass ratio [(C1 + C2) / B] is in the range of 1 ~ 10, mass ratio of sulfonic acid-based anionic surfactant (C2) to anionic surfactant (C1) (C2 / C1) Examples 1 to 3 in the range of 0.1 to 10 had few rough surface defects and streak defects, and there were also few large active agent aggregates having a size of 1.2 μm or more. The PVA film (Comparative Examples 3 to 6) whose mass ratio [(C1 + C2) / B] is out of the range of 1 to 10 has rough surface defects and streak defects, or evaluation of active agent agglomerates. One is worse. In addition, the PVA film (Comparative Examples 4 to 6) whose total content (B + C1 + C2) exceeds 0.1 to 1 part by mass is that in any of the examples, there are many aggregates of the active agent existing in the film, and the film is transparent. Sex decreased.

如上述實施例所示,本發明之PVA薄膜係面粗糙狀、條紋狀缺點少,並且由於薄膜內部之活性劑的分散性良好,所以透明性亦優良。藉由使用此種PVA薄膜作為原始薄膜,可得到光透過率高且品質高之光學薄膜,尤其偏光薄膜。又,藉由使用本發明之PVA薄膜作為原料薄膜,能以高產量製造光學薄膜等,使成本減低。 As shown in the above examples, the PVA film of the present invention has few defects such as a rough surface and a stripe shape, and because the dispersibility of the active agent inside the film is good, the transparency is also excellent. By using such a PVA film as an original film, an optical film with high light transmittance and high quality, especially a polarizing film, can be obtained. In addition, by using the PVA film of the present invention as a raw material film, an optical film or the like can be manufactured at a high yield, and the cost can be reduced.

Claims (7)

一種聚乙烯醇薄膜,其為含有聚乙烯醇(A)、非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及與該C1相異之磺酸系陰離子性界面活性劑(C2)的聚乙烯醇薄膜;其中聚乙烯醇(A)係平均聚合度為500~7000,皂化度為99.0莫耳%以上;相對於100質量份之聚乙烯醇(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及該磺酸系陰離子性界面活性劑(C2)之含量,任一者均為0.001~1質量份;相對於非離子性界面活性劑(B),陰離子性界面活性劑(C1)及該磺酸系陰離子性界面活性劑(C2)之合計質量比[(C1+C2)/B]為1~10;相對於陰離子性界面活性劑(C1),該磺酸系陰離子性界面活性劑(C2)之質量比(C2/C1)為0.1~10。     A polyvinyl alcohol film comprising polyvinyl alcohol (A), a non-ionic surfactant (B), an anionic surfactant (C1), and a sulfonic acid-based anionic surfactant different from the C1 ( C2) polyvinyl alcohol film; where the average degree of polymerization of polyvinyl alcohol (A) is 500-7000, and the degree of saponification is 99.0 mol% or more; non-ionic interface relative to 100 parts by mass of polyvinyl alcohol (A) The content of the active agent (B), the anionic surfactant (C1), and the sulfonic acid-based anionic surfactant (C2) are each 0.001 to 1 part by mass; compared with the nonionic surfactant ( B), the total mass ratio [(C1 + C2) / B] of the anionic surfactant (C1) and the sulfonic acid-based anionic surfactant (C2) is 1 to 10; compared with the anionic surfactant ( C1). The mass ratio (C2 / C1) of the sulfonic acid-based anionic surfactant (C2) is 0.1 to 10.     如請求項1之聚乙烯醇薄膜,其中相對於100質量份之聚乙烯醇(A),非離子性界面活性劑(B)、陰離子性界面活性劑(C1)及該磺酸系陰離子性界面活性劑(C2)之合計含量(B+C1+C2)為0.1~1質量份。     For example, the polyvinyl alcohol film of claim 1, wherein the nonionic surfactant (B), the anionic surfactant (C1), and the sulfonic acid anionic interface are relative to 100 parts by mass of the polyvinyl alcohol (A). The total content (B + C1 + C2) of the active agent (C2) is 0.1 to 1 part by mass.     如請求項1或2之聚乙烯醇薄膜,其進一步含有可塑劑(D),相對於100質量份之聚乙烯醇(A),可塑劑(D)之含量為1~20質量份。     For example, the polyvinyl alcohol film of claim 1 or 2 further contains a plasticizer (D), and the content of the plasticizer (D) is 1 to 20 parts by mass based on 100 parts by mass of the polyvinyl alcohol (A).     如請求項1至3中任一項之聚乙烯醇薄膜,其中薄膜之厚度為10~80μm。     The polyvinyl alcohol film according to any one of claims 1 to 3, wherein the thickness of the film is 10 to 80 μm.     如請求項1至4中任一項之聚乙烯醇薄膜,其中薄膜寬度為3m以上。     The polyvinyl alcohol film according to any one of claims 1 to 4, wherein the film width is 3 m or more.     一種薄膜卷,其係由如請求項1至5中任一項之聚乙烯醇薄膜捲繞核心而成。     A film roll comprising a polyvinyl alcohol film wound core according to any one of claims 1 to 5.     一種薄膜卷之製造方法,其係將藉由擠壓製膜法製造的如請求項1至5中任一項之聚乙烯醇薄膜捲繞核心。     A method for manufacturing a film roll is a method of winding a polyvinyl alcohol film according to any one of claims 1 to 5 manufactured by an extrusion film forming method.    
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