TWI447022B - Substrate film - Google Patents
Substrate film Download PDFInfo
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- TWI447022B TWI447022B TW098123745A TW98123745A TWI447022B TW I447022 B TWI447022 B TW I447022B TW 098123745 A TW098123745 A TW 098123745A TW 98123745 A TW98123745 A TW 98123745A TW I447022 B TWI447022 B TW I447022B
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- film
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- adhesive layer
- base film
- laminated
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- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
Description
本發明關於在單面層合黏著劑所成的保護薄膜所用之基材薄膜，詳細地關於在層合黏著劑層以形成保護薄膜後，於捲繞之際及黏貼於被附體(被保護體)之際，不會發生氣泡混入等問題的保護薄膜用基材薄膜，尤其適用於光學構件的表面保護薄膜之基材薄膜。The present invention relates to a substrate film for use in a protective film formed by laminating an adhesive on one side, and in detail, after laminating an adhesive layer to form a protective film, it is adhered to and adhered to the object after being wrapped (protected In the case of a film, a base film for a protective film which does not cause problems such as air bubbles is mixed, and is particularly suitable for a base film of a surface protective film of an optical member.
於鋼板、樹脂板、汽車、光學零件等的製造中及製造後的移送、保管之際，為了保護製品的表面防止損傷或污垢附著等，而在製品表面上黏貼保護薄膜以進行保護。此等保護薄膜通常由基材薄膜及在其上所層合的黏著劑層所構成。In the production of steel sheets, resin sheets, automobiles, optical parts, and the like, and during transportation and storage after the production, in order to protect the surface of the product from damage or dirt, a protective film is adhered to the surface of the product for protection. These protective films are usually composed of a substrate film and an adhesive layer laminated thereon.
近年來，光學零件，尤其液晶關聯領域中的各種零件之表面保護薄膜的需求係正在增加。光學零件由於係組合多數的零件而製造，故各零件的表面係要求非常高度的平滑性(參照特開平11-160505號公報)，對於零件表面，必須防止異物的混入、損傷。於此等光學零件的製造中，在將各步驟所生產的零件送到下一步驟為止之間，為了保護零件防止損傷、污垢等，生產後在乾淨條件下直接黏貼表面保護薄膜，在該狀態下保管、輸送，零件規格的光學檢查亦在貼有保護薄膜的狀態下進行。為了恰當地進行光學零件的光學檢查，當經由黏著劑層在被附體(光學零件)上黏貼保護薄膜時，嚴格要求不能捲入氣泡。又，要求暫時黏貼的表面保護薄膜係在零件的保管、輸送中不會不慎地剝落，但另一方面，於抵達下一步驟之際，要求可快速地去除，而且在去除後的光學零件之表面上不殘留黏著劑的痕跡。In recent years, the demand for surface protective films for optical parts, particularly various parts in the field of liquid crystal related, is increasing. Since the optical parts are manufactured by combining a large number of parts, the surface of each part is required to have a very high degree of smoothness (refer to Japanese Laid-Open Patent Publication No. Hei 11-160505), and it is necessary to prevent foreign matter from being mixed or damaged on the surface of the parts. In the manufacture of such optical parts, in order to protect the parts from damage, dirt, etc., after the parts produced in the respective steps are sent to the next step, the surface protective film is directly adhered under clean conditions after production. Under the storage and transportation, the optical inspection of the part specifications is also carried out with the protective film attached. In order to properly perform optical inspection of optical parts, when a protective film is adhered to an attached body (optical part) via an adhesive layer, it is strictly required that air bubbles cannot be caught. Moreover, the surface protection film which is required to be temporarily adhered does not inadvertently peel off during storage and transportation of the parts, but on the other hand, upon reaching the next step, it is required to be quickly removed, and the optical parts after removal are required. No trace of adhesive remains on the surface.
為了不成為上述光學檢查的障礙，要求該保護薄膜之魚眼極少。In order not to be an obstacle to the above optical inspection, the protective film is required to have few fish eyes.
又，方便上保護薄膜係被製造成為捲成輥狀的捲繞體而保存。於此捲繞體的製造中，若在黏著劑層與一個下面的薄膜層之間捲入氣泡，則氣泡的痕跡殘留在黏著劑層，而成為上述光學檢查的障礙。最慘的狀況為在捲繞時發生皺紋，亦有無法使用作為製品的情況。再者，當保護薄膜為捲繞體時，要求其黏著劑層與一個下面的薄膜層之基材薄膜不發生不好的強固黏著，在使用時容易拉出保護薄膜。Moreover, it is convenient to store the protective film in a wound body wound into a roll shape. In the production of the wound body, if air bubbles are trapped between the adhesive layer and one of the lower film layers, the traces of the air bubbles remain in the adhesive layer, which is an obstacle to the optical inspection described above. The worst situation is that wrinkles occur during winding, and there are cases where it cannot be used as a product. Further, when the protective film is a wound body, it is required that the adhesive film layer and the base film of the underlying film layer do not have a bad strong adhesion, and the protective film is easily pulled out during use.
如此地，於保護薄膜的黏著劑層之黏著性，要求符合場面及接觸對象的各種性能，要求微細調整。以往，通常從黏著劑的材料面及捲繞體製造時的捲繞條件之最合適化來進行此調整。然而，有指出若依照此方法，則捲繞體的製造時及使用時所要求的性能與作為保護薄膜的性能之平衡之取得係非常困難，而且亦無法取得其再現性。In this way, the adhesion of the adhesive layer of the protective film is required to conform to various properties of the scene and the object to be contacted, and fine adjustment is required. Conventionally, this adjustment is usually performed from the material surface of the adhesive and the winding conditions at the time of production of the wound body. However, it has been pointed out that according to this method, the balance between the performance required at the time of manufacture and use of the wound body and the performance as a protective film is extremely difficult, and the reproducibility cannot be obtained.
關於此點，特開2007-160598號公報中揭示與印刷電路基板的保護薄膜有關的將保護薄膜的單面進行粗面化的技術。然而，該公報所記載的技術係關於粗面的形成，其用於在印刷電路基板的感光性光阻樹脂組成物層表面上轉印凹凸；以光學零件用的保護薄膜成為捲繞體時，抑制黏著劑層與一個下面的薄膜層之基材薄膜的不好之強固接著的效果係微弱，而且該公報的基材薄膜係二軸拉伸薄膜，由於具有偏光特性，故不適合於上述光學零件的光學檢查。In this regard, JP-A-2007-160598 discloses a technique for roughening a single surface of a protective film relating to a protective film of a printed circuit board. However, the technique described in this publication relates to the formation of a rough surface for transferring unevenness on the surface of the photosensitive resist resin composition layer of the printed circuit board, and when the protective film for optical parts is a wound body, The effect of suppressing the adhesion of the adhesive film layer to the underlying film layer is weak, and the base film of the publication is a biaxially stretched film which is not suitable for the above optical component because of its polarizing characteristics. Optical inspection.
然而，以保護光學零件的表面為目的來使用保護薄膜時，不僅在該光學零件的單面而且亦有在兩面各自貼上保護薄膜的情況。於此情況下，為了可容易辨別該光學零件的表裏，較佳為2片保護薄膜中的至少一方經著色的薄膜。However, when the protective film is used for the purpose of protecting the surface of the optical component, not only the single surface of the optical component but also the protective film may be attached to both surfaces. In this case, in order to easily distinguish the front and back of the optical component, at least one of the two protective films is preferably colored.
作為將用於該目的之薄膜著色的方法，例如已知對薄膜的表面施予印刷的方法。然而，若依照此方法，除了薄膜的成型，另外需要再施予印刷的步驟，不僅經濟性差，而且在薄膜表面上薄地均勻印刷係困難，發生印刷不均的可能性高，由於此印刷不均而對光學零件的光學檢查有造成障礙之問題。再者，以印刷法所製造的著色薄膜，在以後之黏著劑層的層合步驟所使用的有機溶劑中，亦有表面的印刷油墨溶出的問題。As a method of coloring a film used for this purpose, for example, a method of applying a printing to the surface of a film is known. However, according to this method, in addition to the formation of the film, the step of applying the printing is additionally required, which is not only economically disadvantageous, but also it is difficult to uniformly print the film on the surface of the film, and the possibility of uneven printing is high, due to uneven printing. Optical inspection of optical components poses a problem. Further, in the colored film produced by the printing method, there is also a problem that the printing ink on the surface is eluted in the organic solvent used in the subsequent lamination step of the adhesive layer.
作為將薄膜著色的另一個方法，有提案在二軸拉伸聚丙烯薄膜的製造時，於縱向拉伸聚丙烯薄膜後，塗佈含有著色劑的塗液，去除溶劑後，再於橫向拉伸，而一步驟製造無印刷不均的著色薄膜之方法(特開2000-25108號公報)。然而，薄膜表面的印刷油墨溶出到有機溶劑中的問題依然未解決，而且由於二軸拉伸薄膜具有偏光特性，根本不適合於光學零件的光學檢查。As another method of coloring a film, it is proposed to apply a coating liquid containing a colorant after longitudinally stretching a polypropylene film in the production of a biaxially oriented polypropylene film, remove the solvent, and then stretch in the transverse direction. In the first step, a method of producing a colored film having no uneven printing is disclosed (JP-A-2000-25108). However, the problem that the printing ink on the surface of the film is eluted into the organic solvent remains unresolved, and since the biaxially stretched film has a polarizing property, it is not suitable for optical inspection of the optical component at all.
如上所述，可適用於光學零件的表面保護薄膜之基材薄膜，係在以往未有提案。As described above, the base film which can be applied to the surface protective film of an optical component has not been proposed in the past.
本發明係鑒於上述情事而完成者，其目的為提供可製造保護薄膜的基材薄膜，該保護薄膜在製造成為捲繞體之際，不會捲入氣泡，可迅速且容易地進行由捲繞體的拉出，而且當黏貼於被附體尤其光學零件上時，不會捲入氣泡。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a base film which can be used for producing a protective film which can be wound up quickly and easily without causing air bubbles to be wound into a wound body. The body is pulled out, and when it is adhered to the attached body, especially the optical component, no air bubbles are caught.
依照本發明，本發明之上述目的及優點為藉由一種基材薄膜來達成：該基材薄膜係用於由在單面層合黏著劑層所成的保護薄膜，該基材薄膜係具有各自由聚烯烴系樹脂所成的至少2層之層合體薄膜，此等2層各自構成層合黏著劑層側的最外層及不層合黏著劑層側的最外層，該基材薄膜之層合黏著劑層側的表面之平均粗糙度(Ra)為0.25μm以下，該基材薄膜之不層合黏著劑層側的表面之平均粗糙度(Ra)為0.30μm以上，而且用於光學零件用保護薄膜。According to the present invention, the above objects and advantages of the present invention are achieved by a substrate film which is used for a protective film formed by laminating an adhesive layer on one side, the substrate film having each At least two laminated thin films made of a free polyolefin resin, each of which constitutes an outermost layer on the side of the laminated adhesive layer and an outermost layer on the side of the non-laminated adhesive layer, and the laminate of the base film The average roughness (Ra) of the surface on the side of the adhesive layer is 0.25 μm or less, and the average roughness (Ra) of the surface of the base film on the side where the adhesive layer is not laminated is 0.30 μm or more, and is used for optical parts. Protective film.
實施發明的最佳形態Best form for implementing the invention
本發明的基材薄膜係具有各自由聚烯烴系樹脂所成的至少2層之層合體薄膜。此等2層各自構成層合黏著劑層側的最外層及不層合黏著劑層側的最外層。本發明的基材薄膜亦可為具有此等2層以外的層當作中間層(內層)的3層以上之多層構造。以下，依順序說明構成本發明的基材薄膜之各層、本發明的基材薄膜之製造方法及本發明的基材薄膜之特性。The base film of the present invention has a laminate film of at least two layers each made of a polyolefin resin. Each of the two layers constitutes the outermost layer on the side of the laminated adhesive layer and the outermost layer on the side of the non-laminated adhesive layer. The base film of the present invention may have a multilayer structure of three or more layers having a layer other than the two layers as an intermediate layer (inner layer). Hereinafter, the characteristics of each layer constituting the base film of the present invention, the method for producing the base film of the present invention, and the base film of the present invention will be described in order.
＜層合黏著劑層側的最外層＞<the outermost layer on the side of the laminated adhesive layer>
作為層合黏著劑層側的最外層所用的聚烯烴系樹脂，從確保表面的平滑性，抑制魚眼的發生之觀點看，較佳為聚丙烯系樹脂。此處，作為聚丙烯系樹脂，較佳為結晶性聚丙烯樹脂，依照JIS K 7210在230℃所測定的熔融流速(MFR)較佳為1～25g/10分鐘，更佳為3～10g/10分鐘。又，結晶性聚丙烯樹脂的熔點較佳為125℃以上，更佳為125～165℃。作為該結晶性聚丙烯樹脂，可舉出丙烯的均聚物(均聚丙烯)、丙烯與其它α-烯烴的無規共聚物(無規聚丙烯)或嵌段共聚物(嵌段聚丙烯)或此等的混合物等。作為可與上述丙烯共聚合的其它α-烯烴，例如可舉出乙烯、1-丁烯、1-戊烯、1-己烯、1-庚烯、1-辛烯、1-壬烯、1-癸烯、4-甲基-1-戊烯等。從保持聚丙烯系樹脂的結晶性之觀點來看，丙烯與其它α-烯烴的無規共聚物或嵌段共聚物中的其它α-烯烴之共聚合比例較佳為10莫耳%以下。其中，聚丙烯均聚物除了魚眼的發生少，而且透明性高及容易展現平滑性，故最合適。The polyolefin-based resin used for the outermost layer on the side of the layer of the adhesive layer is preferably a polypropylene-based resin from the viewpoint of ensuring the smoothness of the surface and suppressing the occurrence of fish eyes. Here, the polypropylene resin is preferably a crystalline polypropylene resin, and the melt flow rate (MFR) measured at 230 ° C in accordance with JIS K 7210 is preferably from 1 to 25 g/10 min, more preferably from 3 to 10 g/ 10 minutes. Further, the melting point of the crystalline polypropylene resin is preferably 125 ° C or higher, more preferably 125 to 165 ° C. Examples of the crystalline polypropylene resin include a homopolymer of propylene (homopolypropylene), a random copolymer of propylene and another α-olefin (random polypropylene), or a block copolymer (block polypropylene). Or such a mixture, etc. Examples of the other α-olefin copolymerizable with the above propylene include ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, and 1 - terpene, 4-methyl-1-pentene, and the like. From the viewpoint of maintaining the crystallinity of the polypropylene-based resin, the copolymerization ratio of propylene to the random copolymer of the other α-olefin or the other α-olefin in the block copolymer is preferably 10 mol% or less. Among them, the polypropylene homopolymer is most suitable in addition to the occurrence of fish eyes, high transparency, and easy to exhibit smoothness.
層合黏著劑層側的最外層之厚度，從減低相反側即不層合黏著劑層側之表面凹凸的影響而成為平滑表面的觀點來看，較佳為2μm以上，更佳為5～50μm，特佳為10～30μm。The thickness of the outermost layer on the side of the layered adhesive layer is preferably 2 μm or more, and more preferably 5 to 50 μm from the viewpoint of reducing the surface unevenness on the opposite side, that is, the surface unevenness on the side of the adhesive layer. It is particularly preferably 10 to 30 μm.
如後述地，在層合黏著劑層側的最外層中亦可配合著色劑。As will be described later, a coloring agent may be blended in the outermost layer on the side of the laminated adhesive layer.
＜不層合黏著劑層側的最外層＞<the outermost layer on the side where the adhesive layer is not laminated>
作為不層合黏著劑層側的最外層所用的聚烯烴系樹脂，較佳為由聚丙烯系樹脂與聚乙烯系樹脂所構成的摻合物。即，聚丙烯系樹脂與聚乙烯系樹脂係互相不相溶，由於此等摻合物形成海島構造，而在表面產生適當的凹凸，因此基材薄膜的不層合黏著劑層側之表面的平均粗糙度(Ra)成為0.30μm以上。The polyolefin resin used for the outermost layer on the side where the pressure-sensitive adhesive layer is not laminated is preferably a blend of a polypropylene resin and a polyethylene resin. In other words, the polypropylene resin and the polyethylene resin are incompatible with each other, and since the blend forms an island structure, and appropriate irregularities are formed on the surface, the surface of the base film is not laminated on the side of the adhesive layer. The average roughness (Ra) is 0.30 μm or more.
作為上述聚丙烯系樹脂，可舉出與作為層合黏著劑層側的最外層所較佳使用的聚丙烯系樹脂之上述例示的同樣者。於此等之中，從魚眼的發生少，透明性高及展現合適表面凹凸的觀點來看，較佳為使用均聚丙烯或嵌段聚丙烯。The polypropylene resin is the same as the above-exemplified polypropylene resin which is preferably used as the outermost layer on the side of the layered adhesive layer. Among these, it is preferred to use homopolypropylene or block polypropylene from the viewpoint of less occurrence of fish eyes, high transparency, and exhibiting appropriate surface unevenness.
作為上述聚乙烯系樹脂，例如可舉出高密度聚乙烯樹脂(HDPE)、低密度聚乙烯樹脂(LDPE)、線狀低密度聚乙烯樹脂(LLDPE)等。作為不層合黏著劑層側的最外層所用的聚乙烯系樹脂，較佳為依照JIS K 7210在190℃所測定的熔融流速(MFR)為0.5～15g/10分鐘的聚乙烯系樹脂，更佳為1～10g/10分鐘的聚乙烯系樹脂。作為上述聚乙烯系樹脂，從所得之基材薄膜的透明性及不層合黏著劑層側之表面凹凸的展現性之觀點來看，最佳為低密度聚乙烯樹脂(LDPE)。Examples of the polyethylene-based resin include high-density polyethylene resin (HDPE), low-density polyethylene resin (LDPE), and linear low-density polyethylene resin (LLDPE). The polyethylene-based resin used for the outermost layer on the side where the pressure-sensitive adhesive layer is not laminated is preferably a polyethylene resin having a melt flow rate (MFR) measured at 190 ° C according to JIS K 7210 of 0.5 to 15 g/10 minutes. It is preferably a polyethylene resin of 1 to 10 g/10 minutes. The polyethylene-based resin is preferably a low-density polyethylene resin (LDPE) from the viewpoint of transparency of the obtained base film and visibility of surface unevenness on the side of the non-laminated adhesive layer.
作為不層合黏著劑層側的最外層所用的聚烯烴系樹脂中上述聚丙烯系樹脂與聚乙烯系樹脂的摻合物比率，對於聚丙烯系樹脂與聚乙烯系樹脂的合計而言，聚乙烯系樹脂的含有比例為5～50重量%，從合適地展現表面凹凸，更抑制魚眼的發生來看係較佳。即，摻合物中的聚乙烯系樹脂之含有比例若少於5重量%，則不能充分展現表面凹凸，在將由對基材薄膜施予黏著加工而得之保護薄膜捲繞之際，會容易捲入氣泡，另一方面，聚乙烯系樹脂的含有比例若多於50重量%，則表面凹凸變非常大，反而容易發生從聚乙烯系樹脂而來的魚眼，不宜用於光學零件等的表面保護薄膜。摻合物中的聚乙烯系樹脂之含有比例更佳為10～40重量%。In the polyolefin resin used for the outermost layer on the side of the non-laminated adhesive layer, the blend ratio of the polypropylene resin and the polyethylene resin is aggregated for the total of the polypropylene resin and the polyethylene resin. The content ratio of the vinyl resin is 5 to 50% by weight, and it is preferable from the viewpoint of appropriately exhibiting surface unevenness and suppressing the occurrence of fish eyes. In other words, when the content of the polyethylene-based resin in the blend is less than 5% by weight, the surface unevenness cannot be sufficiently exhibited, and the protective film obtained by applying the adhesive film to the base film can be easily wound. When the content of the polyethylene resin is more than 50% by weight, the surface unevenness is extremely large, and the fish eye from the polyethylene resin is likely to be generated, which is not suitable for use in optical parts and the like. Surface protection film. The content of the polyethylene-based resin in the blend is more preferably from 10 to 40% by weight.
不層合黏著劑層側的最外層所用的聚烯烴系樹脂，較佳為由聚丙烯系樹脂與聚乙烯系樹脂所構成的摻合物，係可藉由眾所周知的方法來調製。例如，可將各自的丸粒以指定比例投入適當的混煉機中，較佳為在200～300℃，較佳混合0.1～2分鐘後，而供用於本發明的基材薄膜之製造。作為較佳的混煉機，例如可舉出擠壓機，特佳為使用單軸擠壓機。於聚丙烯系樹脂與聚乙烯系樹脂所構成的摻合物之調製中當使用擠壓機時，模頭溫度較佳為與樹脂溫度相同。The polyolefin-based resin used for the outermost layer on the side where the pressure-sensitive adhesive layer is not laminated is preferably a blend of a polypropylene-based resin and a polyethylene-based resin, which can be prepared by a known method. For example, the respective pellets may be introduced into a suitable kneader at a predetermined ratio, preferably at 200 to 300 ° C, preferably after mixing for 0.1 to 2 minutes, for the production of the base film used in the present invention. As a preferable kneading machine, an extruder is mentioned, for example, and it is especially preferable to use a uniaxial extruder. In the preparation of a blend of a polypropylene resin and a polyethylene resin, when an extruder is used, the die temperature is preferably the same as the resin temperature.
於上述聚丙烯系樹脂與聚乙烯系樹脂的摻合物中，藉由設定聚丙烯系樹脂與聚乙烯系樹脂的摻合物比率及混煉機的混煉條件(尤其剪切)，而可任意地控制所得到的基材薄膜之不層合黏著劑層側表面的表面粗度。In the blend of the polypropylene resin and the polyethylene resin, the blend ratio of the polypropylene resin to the polyethylene resin and the kneading conditions (especially shear) of the kneader can be set. The surface roughness of the side surface of the obtained substrate film which is not laminated with the adhesive layer is arbitrarily controlled.
上述不層合黏著劑層側的最外層之厚度，從在不層合黏著劑層側的表面上確實展現適當凹凸的觀點來看，較佳為2μm以上，更佳為5～50μm，特佳為10～30μm。The thickness of the outermost layer on the side of the non-laminated adhesive layer is preferably 2 μm or more, more preferably 5 to 50 μm, from the viewpoint of exhibiting appropriate unevenness on the surface on the side where the pressure-sensitive adhesive layer is not laminated. It is 10 to 30 μm.
如後述地，在不層合黏著劑層側的最外層中，亦可配合著色劑。As will be described later, a coloring agent may be blended in the outermost layer on the side where the adhesive layer is not laminated.
＜中間層＞<intermediate layer>
於本發明的基材薄膜中，最外層的兩面之表面凹凸狀態係非常重要。因此，以減低一側的最外層之表面凹凸對相反側的最外層之表面凹凸的影響為目的，較佳為具有層合黏著劑層側的最外層及層合黏著劑層側的最外層以外之層當作中間層。於此情況下，該中間層較佳為聚烯烴系樹脂。作為此聚烯烴系樹脂，可舉出聚丙烯系樹脂、聚乙烯系樹脂等。In the base film of the present invention, the surface unevenness of both surfaces of the outermost layer is very important. Therefore, in order to reduce the influence of the surface unevenness of the outermost layer on one side on the surface unevenness of the outermost layer on the opposite side, it is preferable to have the outermost layer on the side of the laminated adhesive layer and the outermost layer on the side of the laminated adhesive layer. The layer acts as an intermediate layer. In this case, the intermediate layer is preferably a polyolefin resin. Examples of the polyolefin-based resin include a polypropylene-based resin and a polyethylene-based resin.
作為此情況的聚丙烯系樹脂，可舉出與作為層合黏著劑層側的最外層所較佳使用的聚丙烯系樹脂之上述例示的同樣者。作為此情況的聚乙烯系樹脂，可舉出與作為不層合黏著劑層側的最外層所較佳使用的聚乙烯系樹脂之上述例示的同樣者。The polypropylene-based resin in this case is the same as the above-exemplified example of the polypropylene-based resin which is preferably used as the outermost layer on the side of the layered adhesive layer. The polyethylene-based resin in this case is the same as the above-exemplified polyethylene resin which is preferably used as the outermost layer on the side of the non-laminated adhesive layer.
作為中間層所使用的聚烯烴系樹脂，從魚眼的發生少之觀點來看，較佳為使用聚丙烯系樹脂，從確保所得到的基材薄膜之柔軟性的觀點來看，特佳為無規聚丙烯或嵌段聚丙烯。The polyolefin-based resin used as the intermediate layer is preferably a polypropylene-based resin from the viewpoint of occurrence of a small amount of fish eyes, and from the viewpoint of ensuring the flexibility of the obtained base film, it is particularly preferable. Atactic polypropylene or block polypropylene.
該中間層可僅由1層所構成，或者也可由2層以上所構成，從薄膜製造時的簡使性之觀點來看，較佳僅為1層。The intermediate layer may be composed of only one layer or two or more layers, and is preferably only one layer from the viewpoint of simplicity in film production.
該中間層的厚度較佳為2～96μm，更佳為6～70μm，特佳為10～50μm。The thickness of the intermediate layer is preferably from 2 to 96 μm, more preferably from 6 to 70 μm, particularly preferably from 10 to 50 μm.
如後述地，在中間層之內的至少1層中，可配合著色劑。As will be described later, a coloring agent can be blended in at least one layer in the intermediate layer.
＜著色劑的配合＞<Coordination of colorants>
構成本發明的基材薄膜之層合黏著劑層側的最外層及不層合黏著劑層側的最外層以及任意存在的中間層之中的至少1層，係可為經配合有著色劑之層。具有至少1層經配合有著色劑之層的本發明之基材薄膜，係適合作為用於製造沒有著色不均，而且沒有印刷油墨(或著色劑)對有機溶劑的溶出之問題的著色薄膜之基材薄膜。At least one of the outermost layer on the side of the layered adhesive layer of the base film of the present invention and the outermost layer on the side of the non-laminated adhesive layer and any intermediate layer present may be blended with a coloring agent. Floor. The base film of the present invention having at least one layer of a colorant-doped layer is suitable as a colored film for producing a problem of no coloring unevenness and no problem of dissolution of an organic solvent by a printing ink (or a coloring agent). Substrate film.
作為上述著色劑，可使用染料及顏料的任一者，從可更確實防止對有機溶劑的溶出，耐候劣化少之點來看，較佳為使用顏料。所使用的顏料係沒有特別的限制，可合適地使用一般作為塑膠用顏料所用的有機系顏料及無機系顏料。As the coloring agent, any of a dye and a pigment can be used, and from the viewpoint of more reliably preventing elution of an organic solvent and having less weathering deterioration, a pigment is preferably used. The pigment to be used is not particularly limited, and organic pigments and inorganic pigments generally used as pigments for plastics can be suitably used.
作為上述有機系顏料，例如可舉出偶氮系顏料、酞花青系顏料、苯胺系顏料、喹吖啶酮系顏料等，作為上述無機系顏料，例如可舉出氧化鈦、氧化鐵紅、群青、碳黑、鈷藍等。此等顏料可單獨使用一種，也可組合二種以上來使用。其中，從顏料本身的二次凝聚物所致的魚眼等之缺陷的發生少，而且在作為構成本發明的基材薄膜之各層的材料所用的聚烯烴系樹脂中之分散性良好來看，較佳為有機系顏料。Examples of the above-mentioned organic pigments include an azo pigment, a phthalocyanine pigment, an aniline pigment, and a quinacridone pigment. Examples of the inorganic pigment include titanium oxide and iron oxide red. Ultramarine, carbon black, cobalt blue, etc. These pigments may be used alone or in combination of two or more. Among them, the occurrence of defects such as fish eyes due to secondary aggregates of the pigment itself is small, and the dispersibility in the polyolefin-based resin used as the material constituting each layer of the base film of the present invention is good. It is preferably an organic pigment.
著色劑對聚烯烴系樹脂的混合比例係根據基材薄膜的厚度、層合黏著劑層側的最外層之厚度等來適宜決定，若考慮最終保護薄膜的透明性(透光性)，則對於100重量份的聚烯烴系樹脂而言，較佳為0.01重量份～5重量份。此混合比例若少於0.01重量份，則色相不清晰，有無法辨識是否貼有經著色的保護薄膜之情況。另一方面，混合比例若多於5重量份，則不僅作為保護薄膜的透明性(透光性)不足，顏料本身的二次凝聚物所致的魚眼等缺陷之發生會變顯著，而且著色劑的成本負擔亦變大，故不實用。The mixing ratio of the colorant to the polyolefin resin is appropriately determined depending on the thickness of the base film, the thickness of the outermost layer on the side of the laminated adhesive layer, and the like, and considering the transparency (transparency) of the final protective film, 100 parts by weight of the polyolefin-based resin is preferably 0.01 parts by weight to 5 parts by weight. If the mixing ratio is less than 0.01 parts by weight, the hue is unclear, and there is a case where it is impossible to recognize whether or not a colored protective film is attached. On the other hand, when the mixing ratio is more than 5 parts by weight, not only the transparency (transparency) of the protective film is insufficient, but also the occurrence of defects such as fish eyes due to secondary aggregates of the pigment itself becomes remarkable, and coloring The cost burden of the agent also becomes large, so it is not practical.
於聚烯烴系樹脂中配合著色劑的方法係沒有特別的限制，例如可為於聚烯烴系樹脂的丸粒中直接配合著色劑之方法，一旦預先混合聚烯烴系樹脂及著色劑，就製造含有高濃度的著色劑之母料(著色劑母料)，混合此著色劑母料與聚烯烴系樹脂的丸粒之方法等，若考慮著色劑的分散狀態，避免著色劑對成型機的附著等，較佳為使用著色劑母料來配合的方法。The method of blending the coloring agent in the polyolefin-based resin is not particularly limited, and for example, a method of directly blending a coloring agent into the pellet of the polyolefin-based resin may be employed, and once the polyolefin-based resin and the coloring agent are mixed in advance, the product is produced. A masterbatch (colorant masterbatch) of a high concentration of a coloring agent, a method of mixing the coloring agent masterbatch and a pellet of a polyolefin resin, and the like, in consideration of the dispersion state of the coloring agent, and avoiding adhesion of the coloring agent to the molding machine, etc. Preferably, a method of using a colorant masterbatch is used.
於構成本發明的基材薄膜之層內的至少1層中配合著色劑而成為著色薄膜時，該基材薄膜係在層合黏著劑層側的最外層及不層合黏著劑層側的最外層以外具有至少1層的中間層，較佳為經配合有該著色劑之層係前述中間層內的至少1層。藉由僅在中間層內的至少1層中配合著色劑，可在以後的黏著劑層之層合步驟中更確實地防止著色劑對所使用的有機溶劑之溶出的問題，防止著色劑對成型機，尤其模頭內部的附著之問題等，而特佳。When a coloring film is blended in at least one layer constituting the layer of the base film of the present invention to form a colored film, the base film is the outermost layer on the side of the laminated adhesive layer and the most non-laminated adhesive layer side. The intermediate layer having at least one layer other than the outer layer, preferably the layer to which the coloring agent is blended is at least one layer in the intermediate layer. By blending the coloring agent only in at least one layer in the intermediate layer, it is possible to more reliably prevent the problem of the dissolution of the coloring agent to the organic solvent used in the laminating step of the subsequent adhesive layer, and prevent the coloring agent from being formed. The machine, especially the problem of adhesion inside the die, is particularly good.
＜基材薄膜的製造方法＞<Method for Producing Substrate Film>
作為本發明的基材薄膜之製造方法，例如可舉出吹脹法、流延法、一軸拉伸的方法等。二軸以上的拉伸，由於所得到的基材薄膜具有偏光特性，故不宜作為光學零件的保護薄膜用途。因此，較佳為以無拉伸來成型，尤其若為流延法的無拉伸薄膜，則可成為熱收縮小的基材薄膜。因此，從層合黏著劑層的步驟中尺寸變化小，而且最終所得之保護薄膜對於被附體的表面凹凸之追隨性優異之點來看係較佳。Examples of the method for producing the base film of the present invention include an inflation method, a casting method, and a method of monoaxial stretching. The stretching of the two or more axes is not suitable as a protective film for optical parts because the obtained base film has polarizing characteristics. Therefore, it is preferable to mold without stretching, and in particular, if it is a non-stretched film of a casting method, it can become a base film which is small heat-shrinkage. Therefore, the dimensional change from the step of laminating the adhesive layer is small, and the protective film finally obtained is preferably excellent in the followability of the surface unevenness of the attached body.
就本發明的基材薄膜而言，較佳為構成其的全部層係各自為無拉伸薄膜。In the case of the base film of the present invention, it is preferred that all of the layers constituting the film are unstretched films.
作為使基材薄膜成為多層構造的方法，例如可採用以多歧管法或供料頭(feed block)法所代表的共擠出法或線內層合法等眾所周知的方法。又，可藉由乾層合等經由黏著劑層來層合各層。As a method of making the base film into a multilayer structure, for example, a well-known method such as a co-extrusion method or an in-line layer method represented by a multi-manifold method or a feed block method can be employed. Further, each layer may be laminated via an adhesive layer by dry lamination or the like.
＜基材薄膜＞<Substrate film>
如此所得之本發明的基材薄膜之厚度(總厚度)，係可按照被附體的面積、形狀等來適宜設定，較佳為10～100μm，更佳為20～80μm，特佳為40～60μm。此處，基材薄膜的厚度若過薄，則在其上層合黏著劑層的步驟中之加熱，會對薄膜導入「熱疹」的皺紋，而無法使用作為製品。另一方面，基材薄膜的厚度若過厚，由於柔軟性不足，當黏貼於表面具有凹凸的被附體時，無法追隨被附體的表面形狀，而發生皺紋，有發生捲入氣泡的不良情況。The thickness (total thickness) of the base film of the present invention thus obtained can be appropriately set in accordance with the area, shape, and the like of the attached body, and is preferably 10 to 100 μm, more preferably 20 to 80 μm, and particularly preferably 40 to 40. 60 μm. Here, if the thickness of the base film is too thin, heating in the step of laminating the adhesive layer thereon may introduce a "hot rash" wrinkle into the film, and it cannot be used as a product. On the other hand, if the thickness of the base film is too large, the flexibility is insufficient, and when it is adhered to the attached body having irregularities on the surface, the surface shape of the attached body cannot be followed, wrinkles are generated, and the bubble is caught. Happening.
本發明的基材薄膜之層合黏著劑層側的最外層係由聚烯烴系樹脂所構成，較佳由聚丙烯系樹脂所構成，其外側表面的平均粗糙度(Ra)為0.25μm以下。此值較佳為0.05～0.25μm，更佳為0.1～0.20μm。本發明的基材薄膜，由於層合黏著劑層側的表面係如上述地非常平滑，故其上所層合的黏著劑層之表面亦同樣地平滑，因此當將其黏貼於被附體時，不會捲入氣泡。The outermost layer on the side of the pressure-sensitive adhesive layer of the base film of the present invention is composed of a polyolefin resin, preferably composed of a polypropylene resin, and has an outer surface having an average roughness (Ra) of 0.25 μm or less. This value is preferably from 0.05 to 0.25 μm, more preferably from 0.1 to 0.20 μm. In the base film of the present invention, since the surface on the side of the laminated adhesive layer is very smooth as described above, the surface of the adhesive layer laminated thereon is also smooth, so that when it is adhered to the attached body, , will not get involved in the bubble.
另一方面，本發明的基材薄膜之不層合黏著劑層側的最外層係由聚烯烴系樹脂所構成，較佳由聚丙烯系樹脂與聚乙烯系樹脂的摻合物所構成，其外側表面的平均粗糙度(Ra)為0.30μm以上。此值較佳為0.30～1.5μm，更佳為0.30～1.0μm，特佳為0.35～0.8μm。本發明的基材薄膜，由於不層合黏著劑層側的表面係如上述的適度粗面，在對基材薄膜作黏著處理而成為保護薄膜後，捲繞成為捲繞體時，可有效地放掉空氣，因此不會捲入氣泡，而且由於捲繞體中的黏著劑層與一個下面的薄膜基材表面之接觸面積少，故可迅速且容易地進行從捲繞體的拉出。上述表面粗糙度係可依照JIS B 0601來測定。On the other hand, the outermost layer on the side of the non-laminated adhesive layer of the base film of the present invention is composed of a polyolefin resin, and is preferably composed of a blend of a polypropylene resin and a polyethylene resin. The average roughness (Ra) of the outer surface is 0.30 μm or more. This value is preferably from 0.30 to 1.5 μm, more preferably from 0.30 to 1.0 μm, particularly preferably from 0.35 to 0.8 μm. In the base film of the present invention, since the surface on the side where the pressure-sensitive adhesive layer is not laminated is the above-mentioned moderately rough surface, the base film is adhered to the protective film and then wound into a wound body, which is effective. Since the air is released, the air bubbles are not caught, and since the contact area between the adhesive layer in the wound body and the surface of the lower film substrate is small, the drawing from the wound body can be quickly and easily performed. The above surface roughness can be measured in accordance with JIS B 0601.
如上述所製造的本發明之基材薄膜係魚眼非常少者。在保護薄膜所用的基材薄膜中，魚眼的大小及個數係重要。即，在基材薄膜中若有尺寸大的魚眼之存在，則在將其黏貼於被附體(光學零件)上而進行光學檢查時，會成為視覺擾亂的主要因素，即使該光學零件為良品也會被判斷為不良品。即使為小尺寸的魚眼，若其個數多，則同樣地成為視覺擾亂的主要因素。本發明的基材薄膜之長徑未滿1.0mm的魚眼之數可為5個/m2 以下，更可為3個/m2 以下。又，長徑1.0mm以上的魚眼之數可為1個/m2 以下，更可為0個/m2 。因此，即使將本發明的基材薄膜用於光學零件的保護薄膜用途時，起因於魚眼的視覺擾亂主要因素係極少，在光學零件的光學檢查中可得到適當正確的結果。The base film of the present invention produced as described above is very few fish eyes. The size and number of fish eyes are important in the substrate film used for the protective film. In other words, when a fish eye having a large size is present in the base film, it is a major factor of visual disturbance when it is optically inspected by adhering it to the object (optical part), even if the optical part is Good products will also be judged as bad products. Even if the number of fish eyes is small, if it is large, it will become a major factor of visual disturbance. The number of fish eyes having a long diameter of less than 1.0 mm in the base film of the present invention may be 5 pieces/m 2 or less, and may be 3 pieces/m 2 or less. Further, the number of fish eyes having a long diameter of 1.0 mm or more may be 1/m 2 or less, and may be 0/m 2 . Therefore, even when the base film of the present invention is used for a protective film of an optical component, the main cause of visual disturbance due to fish eyes is extremely small, and appropriate and correct results can be obtained in optical inspection of optical components.
本發明的基材薄膜係透明性高者。本發明的基材薄膜之依照JIS K 7105所測定的霧度可為80%以下，更佳為50%以下。本發明的基材薄膜，由於如上述地透明性極高，故其在成為保護薄膜後而黏貼於被附體時，不會成為光學檢查的障礙。The base film of the present invention is high in transparency. The base film of the present invention may have a haze of 80% or less, more preferably 50% or less, measured in accordance with JIS K 7105. Since the base film of the present invention has extremely high transparency as described above, it does not become an obstacle to optical inspection when it is adhered to the attached body after being used as a protective film.
本發明的基材薄膜係具有適度強度者。本發明的基材薄膜之拉伸彈性模數較佳為400～1,100MPa，更佳為600～900MPa，特佳為650～850MPa。基材薄膜的拉伸彈性模數在該薄膜的MD方向(機器方向)及TD方向(橫向)的兩方向中，較佳為在上述範圍內。由具有如此的拉伸彈性模數之本發明的基材薄膜所製造的保護薄膜，當黏貼於被附體時及由被附體剝離時，操作性優異。此拉伸彈性模數係可依照JIS K 7127，使用JIS-5號試驗片來測定。The base film of the present invention has moderate strength. The base film of the present invention preferably has a tensile modulus of elasticity of from 400 to 1,100 MPa, more preferably from 600 to 900 MPa, particularly preferably from 650 to 850 MPa. The tensile elastic modulus of the base film is preferably in the above range in both the MD direction (machine direction) and the TD direction (lateral direction) of the film. The protective film produced from the base film of the present invention having such a tensile modulus is excellent in handleability when it is adhered to the attached body and peeled off from the attached body. This tensile elastic modulus can be measured in accordance with JIS K 7127 using a JIS-5 test piece.
當在構成本發明的基材薄膜的層內之至少1層中配合著色劑以成為著色薄膜時，該著色薄膜由於沒有著色不均，故即使在光學零件的光學檢查中也得到適當正確的結果，而且可避免在黏著劑層的層合時，著色劑對有機溶劑的溶出等問題。When a coloring agent is blended in at least one layer constituting the layer of the base film of the present invention to form a colored film, since the colored film is not unevenly colored, appropriate correct results are obtained even in optical inspection of optical parts. Moreover, problems such as dissolution of the colorant to the organic solvent at the time of lamination of the adhesive layer can be avoided.
本發明的基材薄膜，從更提高與其上所層合的黏著劑層之密接性的觀點來看，較佳為在對於層合黏著劑層側的表面，以線內或離線施予表面處理後，層合黏著劑層。作為該表面處理，例如可舉出電暈放電處理、火焰(flame)處理等。In the base film of the present invention, from the viewpoint of further improving the adhesion to the adhesive layer laminated thereon, it is preferred to apply the surface treatment in an in-line or off-line manner on the surface on the side of the laminated adhesive layer. Thereafter, the adhesive layer is laminated. Examples of the surface treatment include corona discharge treatment, flame treatment, and the like.
實施例Example
以下舉出實施例及比較例來說明本發明，惟本發明不受此等實施例所限定。The invention is illustrated by the following examples and comparative examples, but the invention is not limited by the examples.
以下實施例及比較例中的各評價係分別採取以下的程序。The following evaluation procedures were adopted for each evaluation system in the following examples and comparative examples.
(1)霧度(1) Haze
作為透明性的指標，使用Suga試驗機(股)製霧度計(型號：HGM-2DP)，依照JIS K 7105來進行霧度的測定。As an index of transparency, a haze meter (model: HGM-2DP) manufactured by a Suga tester (manufactured by a stock) was used, and the haze was measured in accordance with JIS K 7105.
(2)拉伸彈性模數(2) Tensile modulus of elasticity
使用(股)島津製作所製Autograph(型號：AG-500D)，依照JIS K 7127，使用JIS-5號試驗片，以50mm/分鐘的拉伸速度，對MD方向及TD方向進行各自的拉伸彈性模數之測定。Using the Autograph (Model: AG-500D) manufactured by Shimadzu Corporation, the JIS-5 test piece was used in accordance with JIS K 7127, and each of the MD and TD directions was stretched at a tensile speed of 50 mm/min. Determination of the modulus.
(3)表面粗糙度(3) Surface roughness
(股)Mitutoyo製接觸式表面粗糙度測定器(型號：SJ-401)，依照JIS B 0601，觸針尖端半徑2μm(60°)，測定速度0.5mm/s，截止值(λc)0.8mm，截止值(λs)25μm，測定長0.8mm，1方向的測定次數為5次，進行表面的平均粗糙度(Ra)之測定。平均粗糙度(Ra)係表示基材薄膜的MD方向之5次測定及TD方向之5次測定(測定次數共10次)的平均值。(Unit) Mitutoyo contact surface roughness measuring device (Model: SJ-401), according to JIS B 0601, stylus tip radius 2μm (60°), measuring speed 0.5mm/s, cutoff value (λc) 0.8mm, The cutoff value (λs) was 25 μm, the measurement length was 0.8 mm, and the number of measurements in one direction was five times, and the measurement of the average roughness (Ra) of the surface was performed. The average roughness (Ra) is an average value of five measurements of the MD direction of the base film and five measurements (10 times of measurement times) in the TD direction.
(4)魚眼(4) Fisheye
將基材薄膜切割成500mm×500mm的大小(0.25m2 )，以此當作試驗片。目視觀察此試驗片上所存在的魚眼，對所發現的各魚眼，以附有最小單位為0.1mm的刻度之放大鏡來測定長徑。對8片的試驗片(0.25m2 ×8片=2m2 )進行同樣的測定，將所發現的魚眼之個數換算為每1m2 的個數，進行評價。The base film was cut into a size of 500 mm × 500 mm (0.25 m 2 ) to serve as a test piece. The fish eyes present on the test piece were visually observed, and the long diameter was measured for each fish eye found with a magnifying glass with a minimum unit of 0.1 mm. The same measurement was performed on eight test pieces (0.25 m 2 × 8 pieces = 2 m 2 ), and the number of fish eyes found was converted into the number per 1 m 2 and evaluated.
(5)氣泡捲入(5) Bubble entrapment
(5-1)加工後捲繞時的氣泡捲入(5-1) Bubble entrapment during winding after processing
於基材薄膜的層合黏著劑層側，藉由後述的方法，以層厚度成為約5μm的方式，層合黏著劑層，藉由捲取機連續地捲繞。目視確認該情況下氣泡的捲入狀態。The adhesive layer was laminated on the side of the layered adhesive layer of the base film by a method described later so that the layer thickness was about 5 μm, and the film was continuously wound by a winder. The state of entrapment of the bubble in this case was visually confirmed.
(5-2)被附體黏貼時的氣泡捲入(5-2) Bubbles caught when attached to the body
於將層合有黏著劑層的基材薄膜黏貼於被附體(壓克力板)時，目視確認氣泡的捲入狀態。When the base film laminated with the adhesive layer was adhered to the attached body (acrylic plate), the state of entrapment of the air bubbles was visually confirmed.
藉由下述來判定上述各自的氣泡捲入狀態。The respective bubble entrapment states described above are determined by the following.
良好：沒有看到氣泡的捲入。Good: No seeing of the entrapment of bubbles.
不良：看到氣泡的捲入而為外觀不良的狀態。Poor: A state in which the appearance of a bubble is impaired and the appearance is poor.
實施例1Example 1
(基材薄膜的作成)(Formation of substrate film)
使用均聚丙烯A(住友化學(股)製，品號：FLX80E4，熔點=163℃，MFR=7g/10分鐘；230℃時)及低密度聚乙烯A(宇部丸善聚乙烯(股)製，品號：F120N，密度=0.920g/cm3 ，熔點=109℃，MFR=1.2g/10分鐘；190℃時)，藉由以下的方法來製作完成薄膜。Using homopolypropylene A (manufactured by Sumitomo Chemical Co., Ltd., product number: FLX80E4, melting point = 163 ° C, MFR = 7 g/10 min; 230 ° C) and low-density polyethylene A (Ube Maru-good polyethylene) The product number: F120N, density = 0.920 g/cm 3 , melting point = 109 ° C, MFR = 1.2 g/10 min; at 190 ° C), the film was produced by the following method.
使用由中間層用的螺桿直徑75mm的單軸擠壓機為1台、兩外層用的螺桿直徑50nm的單軸擠壓機為2台的合計3台之擠壓機所構成的3種3層構成之T模頭方式薄膜製膜裝置，對中間層用擠壓機供應均聚丙烯A，對外層(層合黏著劑層側=冷卻輥側)用的擠壓機供應均聚丙烯A，而且對外層(不層合黏著劑層側)用的擠壓機供應由90重量份的均聚丙烯A與10重量份的低密度聚乙烯A所混合者，在樹脂溫度250℃、滯留時間1分鐘、T模頭溫度250℃的條件下，由T模頭擠出，通過25℃的冷卻輥，而得到由厚度12μm的外層(層合黏著劑層側)、厚度16μm的中間層及厚度12μm的外層(不層合黏著劑層側)所構成之總厚度40μm的3層無拉伸聚丙烯薄膜。接著，施予電暈放電處理，以使薄膜的層合黏著劑層側之表面的潤濕指數成為42mN/m，再藉由於40℃下進行24小時的熟成，而得到基材薄膜。A three-layer extruder consisting of a single-axis extruder with a screw diameter of 75 mm for the intermediate layer and a single-axis extruder with a screw diameter of 50 nm for two outer layers, and a total of three extruders of two. a T-die type film forming apparatus comprising a homopolypropylene A for an intermediate layer extruder and a homopolypropylene A for an outer layer (lamination of the adhesive layer side = cooling roll side), and An extruder for the outer layer (on the side of the non-laminated adhesive layer) was supplied by mixing 90 parts by weight of homopolypropylene A with 10 parts by weight of low-density polyethylene A at a resin temperature of 250 ° C for a residence time of 1 minute. The T die was extruded at a temperature of 250 ° C, and extruded through a T die, and passed through a 25 ° C cooling roll to obtain an outer layer having a thickness of 12 μm (on the side of the laminated adhesive layer), an intermediate layer having a thickness of 16 μm, and a thickness of 12 μm. A three-layer unstretched polypropylene film having a total thickness of 40 μm composed of an outer layer (on the side of the non-laminated adhesive layer). Next, a corona discharge treatment was applied so that the wetting index of the surface of the film on the side of the layer of the adhesive layer was 42 mN/m, and the substrate film was obtained by aging at 40 ° C for 24 hours.
使用此基材薄膜，進行上述(1)～(4)的評價。表2中顯示評價結果。The evaluation of the above (1) to (4) was carried out using this base film. The evaluation results are shown in Table 2.
(黏著劑層對基材薄膜的層合)(Lamination of the adhesive layer to the substrate film)
對於上述所得之基材薄膜的電暈處理面，塗佈丙烯酸系黏著劑及進行乾燥，而層合厚度10μm的黏著劑層。The surface of the corona-treated surface of the base film obtained above was coated with an acrylic adhesive and dried to laminate an adhesive layer having a thickness of 10 μm.
使用此黏著劑層層合後的薄膜，進行上述(5)的評價。表2中顯示評價結果。The film of the above (5) was evaluated by using the film laminated with this adhesive layer. The evaluation results are shown in Table 2.
實施例2Example 2
除了供應給中間層用的擠壓機之樹脂為嵌段聚丙烯A(日本Polypropylene(股)製，品號：BC3HF，丙烯-乙烯嵌段共聚物型，熔點=162℃，MFR=7g/10分鐘；230℃時)，而且供應給外層(不層合黏著劑層側)用的擠壓機之樹脂為由70重量份的嵌段聚丙烯A與30重量份的低密度聚乙烯A所混合者以外，與上述實施例1同樣地實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The resin of the extruder supplied to the intermediate layer was block polypropylene A (manufactured by Japan Polypropylene Co., Ltd., product number: BC3HF, propylene-ethylene block copolymer type, melting point = 162 ° C, MFR = 7 g/10 Minute; at 230 ° C), and the resin supplied to the extruder for the outer layer (the side of the non-laminated adhesive layer) is mixed with 70 parts by weight of the block polypropylene A and 30 parts by weight of the low density polyethylene A. A base film was obtained in the same manner as in Example 1 except the above. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例3Example 3
除了供應給外層(層合黏著劑層側)用的擠壓機之樹脂為嵌段聚丙烯A，與上述實施例2同樣地實施而得到基材薄膜。對此等基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The base film was obtained in the same manner as in Example 2 except that the resin supplied to the extruder for the outer layer (the side of the layer of the adhesive layer) was block polypropylene A. The base film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on the base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例4Example 4
除了供應給外層(不層合黏著劑層側)用的擠壓機之樹脂係嵌段聚丙烯A與低密度聚乙烯A的混合比例成為如表1記載者以外，與上述實施例2同樣實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The mixing ratio of the resin-based block polypropylene A and the low-density polyethylene A to the extruder for the outer layer (the side of the non-laminated adhesive layer) was as described in Table 1, and was carried out in the same manner as in the above-described Example 2. A substrate film was obtained. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例5Example 5
除了供應給中間層用的擠壓機之樹脂為無規聚丙烯A((股)PRIMEPOLYMER製，品號：F327BV，丙烯-乙烯-丁烯無規共聚物型，熔點=138℃，MFR=7g/10分鐘；230℃時)，而且供應給外層(不層合黏著劑層側)用的擠壓機之樹脂為由70重量份的無規聚丙烯A與30重量份的低密度聚乙烯B(宇部丸善聚乙烯(股)製，品號：F522N，密度=0.922g/cm3 ，熔點=110℃，MFR=5.0g/10分鐘；190℃時)所混合者以外，與上述實施例1同樣地實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The resin supplied to the extruder for the intermediate layer was a random polypropylene A (manufactured by PRIMEPOLYMER, product number: F327BV, propylene-ethylene-butene random copolymer type, melting point = 138 ° C, MFR = 7 g /10 minutes; 230 ° C), and the resin supplied to the extruder for the outer layer (on the side of the non-laminated adhesive layer) is 70 parts by weight of random polypropylene A and 30 parts by weight of low density polyethylene B (Formed by Ube Maruzen Polyethylene Co., Ltd., product number: F522N, density = 0.922 g/cm 3 , melting point = 110 ° C, MFR = 5.0 g/10 min; at 190 ° C), and the above Example 1 The substrate film was obtained in the same manner. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例6Example 6
除了各層的厚度係外層(層合黏著劑層側)為25μm，中間層為25μm，而且外層(不層合黏著劑層側)為25μm，總厚度為75μm以外，與上述實施例2同樣地實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The same procedure as in the above-described Example 2 was carried out except that the thickness of the outer layer (the side of the layer of the adhesive layer) was 25 μm, the intermediate layer was 25 μm, and the outer layer (the side of the non-laminated adhesive layer) was 25 μm, and the total thickness was 75 μm. A substrate film was obtained. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例7Example 7
除了外層(層合黏著劑層側)的厚度為20μm且外層(不層合黏著劑層側)為20μm，而且停止來自中間層的擠壓機之原料供給，使成為總厚度40μm的2層構成以外，與上述實施例1同樣地實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。The thickness of the outer layer (the side of the layer of the adhesive layer) was 20 μm and the outer layer (the side of the layer on which the adhesive layer was not laminated) was 20 μm, and the supply of the raw material from the extruder of the intermediate layer was stopped to form a two-layer structure having a total thickness of 40 μm. A base film was obtained in the same manner as in Example 1 except that it was carried out. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
實施例8Example 8
除了作為供應給中間層用的擠壓機之樹脂，使用對於100重量份的嵌段聚丙烯A(日本Polypropylene(股)製，品號：BC3HF，丙烯-乙烯嵌段共聚物型，熔點=162℃，MFR=7g/10分鐘；230℃時)，配合有5重量份的著色劑母料(DIC(股)製，品號：PEONY HP BLUE L-83285M，無規聚丙烯(丙烯乙烯無規共聚合型，MFR=8g/10分鐘；230℃時)中含有約5重量%的酞花青藍之母料)之著色樹脂以外，與上述實施例2同樣地實施而得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。又，本實施例的基材薄膜經確認在黏著劑層層合時，完全沒有發生著色劑對有機溶劑的溶出。In addition to the resin as an extruder for the intermediate layer, 100 parts by weight of block polypropylene A (manufactured by Japan Polypropylene Co., Ltd., product number: BC3HF, propylene-ethylene block copolymer type, melting point = 162) was used. °C, MFR=7g/10min; 230°C), with 5 parts by weight of color masterbatch (DIC), product number: PEONY HP BLUE L-83285M, random polypropylene (propylene ethylene random) A base film was obtained in the same manner as in Example 2 except that the coloring resin of the copolymerization type, MFR = 8 g/10 min; and a masterbatch containing about 5% by weight of phthalocyanine blue at 230 ° C) was used. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2. Further, in the base film of the present embodiment, it was confirmed that the elution of the colorant to the organic solvent did not occur at all when the adhesive layer was laminated.
比較例1Comparative example 1
除了供應給全部層的擠壓機之樹脂僅為嵌段聚丙烯A以外，與上述實施例1同樣地實施而各自得到基材薄膜。對此基材薄膜進行上述(1)～(4)的評價，對與實施例1同樣地在基材薄膜上層合有黏著劑層的薄膜，進行上述(5)的評價。表2中顯示評價結果。A base film was obtained in the same manner as in Example 1 except that the resin of the extruder supplied to all the layers was only the block polypropylene A. The substrate film was evaluated for the above (1) to (4), and a film in which an adhesive layer was laminated on a base film in the same manner as in Example 1 was evaluated, and the evaluation of the above (5) was carried out. The evaluation results are shown in Table 2.
再者，表1中原料的簡稱各自係如下的意思。In addition, the abbreviation of the raw material in Table 1 has the following meaning.
H-PP-A：均聚丙烯A(住友化學(股)製，品號：FLX80E4，熔點=163℃，MFR=7g/10分鐘；230℃時)H-PP-A: homopolypropylene A (manufactured by Sumitomo Chemical Co., Ltd., article number: FLX80E4, melting point = 163 ° C, MFR = 7 g / 10 min; 230 ° C)
B-PP-A：嵌段聚丙烯A(日本Polypropylene(股)製，品號：BC3HF，丙烯-乙烯嵌段共聚物型，熔點=162℃，MFR=7g/10分鐘；230℃時)B-PP-A: Block Polypropylene A (manufactured by Japan Polypropylene Co., Ltd., article number: BC3HF, propylene-ethylene block copolymer type, melting point = 162 ° C, MFR = 7 g / 10 min; 230 ° C)
R-PP-A：無規聚丙烯A((股)PRIMEPOLYMER製，品號：F327BV，丙烯-乙烯-丁烯無規共聚物型，熔點=138℃，MFR=7g/10分鐘；230℃時)R-PP-A: atactic polypropylene A (manufactured by PRIMEPOLYMER, article number: F327BV, propylene-ethylene-butene random copolymer type, melting point = 138 ° C, MFR = 7 g / 10 min; 230 ° C )
LDPE-A：低密度聚乙烯A(宇部丸善聚乙烯(股)製，品號：F120N，密度=0.920g/cm3 ，熔點=109℃，MFR=1.2g/10分鐘；190℃時)LDPE-A: low density polyethylene A (made by Ube Maruzen Polyethylene Co., Ltd., article number: F120N, density = 0.920 g/cm 3 , melting point = 109 ° C, MFR = 1.2 g/10 min; 190 ° C)
LDPE-B：低密度聚乙烯B(宇部丸善聚乙烯(股)製，品號：F522N，密度=0.922g/cm3 ，熔點=110℃，MFR=5.0g/10分鐘；190℃時)LDPE-B: low density polyethylene B (made by Ube Maruzen Polyethylene Co., Ltd., article number: F522N, density = 9.922g/cm 3 , melting point = 110 ° C, MFR = 5.0 g/10 min; 190 ° C)
PhB-MB：酞花青藍母料(DIC(股)製，品號：PEONY HP BLUE L-83285M，在無規聚丙烯(丙烯-乙烯無規共聚合型，MFR=8g/10分鐘；230℃時)中含有約5重量%的酞花青藍之母料)PhB-MB: phthalocyanine blue masterbatch (DIC), article number: PEONY HP BLUE L-83285M, in atactic polypropylene (propylene-ethylene random copolymerization type, MFR = 8g/10 minutes; 230 Containing about 5% by weight of the masterbatch of phthalocyanine blue at °C)
發明的效果Effect of the invention
本發明的基材薄膜，由於其層合黏著劑層側的表面為平滑，而且其上所層合的黏著劑層亦同樣地變平滑，因此由本發明記載的薄膜所製造的保護薄膜，係在將其黏貼於被附體時不會發生氣泡的捲入。本發明的基材薄膜，由於其不層合黏著劑層側的表面具有適度表面粗度，而在黏著加工後的捲取時可效率地放掉空氣，故在捲繞體的製造時不會發生氣泡的捲入。再者，本發明的基材薄膜，由於可藉由製程時間短的簡易方法來製造，故主要起因於加工時的熱劣化物所致的魚眼係極少。In the base film of the present invention, since the surface on the side of the laminated adhesive layer is smooth and the adhesive layer laminated thereon is similarly smooth, the protective film produced by the film of the present invention is When it is adhered to the attached body, the entrapment of air bubbles does not occur. Since the substrate film of the present invention has a moderate surface roughness on the surface on the side where the adhesive layer is not laminated, the air can be efficiently discharged during the winding after the adhesion processing, so that the wound body is not manufactured at the time of manufacture. The entrapment of bubbles occurs. Further, since the base film of the present invention can be produced by a simple method with a short process time, the fisheye system mainly caused by the thermally deteriorated material during processing is extremely small.
因此，本發明的基材薄膜特別可適用於光學零件的光學零件用保護薄膜。Therefore, the base film of the present invention is particularly suitable for use as a protective film for optical parts of optical parts.
Claims (5)
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| JP2011042779A (en) * | 2009-07-23 | 2011-03-03 | Nitto Denko Corp | Pressure-sensitive adhesive tape |
| EP2559745A4 (en) * | 2010-04-13 | 2014-01-01 | Toray Advanced Film Co Ltd | Surface protective film |
| JP5620227B2 (en) * | 2010-10-29 | 2014-11-05 | 株式会社寺岡製作所 | Adhesive tape |
| JP2014112576A (en) * | 2012-11-28 | 2014-06-19 | Tatsuta Electric Wire & Cable Co Ltd | Shield film |
| JP6450080B2 (en) * | 2014-03-31 | 2019-01-09 | 住化プラステック株式会社 | Adhesive tape |
| JP6565907B2 (en) * | 2014-05-30 | 2019-08-28 | 日本ゼオン株式会社 | Multi-layer film and wound body |
| KR101737181B1 (en) * | 2014-09-30 | 2017-05-17 | 삼성에스디아이 주식회사 | Optical film and method for preparing the same |
| KR102313074B1 (en) * | 2016-03-24 | 2021-10-14 | 린텍 가부시키가이샤 | Composite sheet for forming support sheet and protective film |
| JP6286014B2 (en) * | 2016-12-19 | 2018-02-28 | パナック株式会社 | Protective film for process |
| JP7204658B2 (en) * | 2017-10-19 | 2023-01-16 | デンカ株式会社 | Single-layer film and heat-resistant adhesive tape using the same |
| WO2019186992A1 (en) * | 2018-03-30 | 2019-10-03 | リンテック株式会社 | Support sheet and composite sheet for protective film formation |
| JP2020050756A (en) * | 2018-09-27 | 2020-04-02 | 日東電工株式会社 | Transparent pressure-sensitive adhesive film |
| WO2021024931A1 (en) * | 2019-08-02 | 2021-02-11 | 東洋製罐株式会社 | Sealant film, laminated film for packaging bag, pouch packaging bag, and pouch package body |
| EP4269104A1 (en) * | 2020-12-23 | 2023-11-01 | Toray Industries, Inc. | Polypropylene film, laminate, packaging material, and packing body |
| JP7154661B1 (en) | 2022-01-28 | 2022-10-18 | 株式会社スミロン | Film laminate for wheel attachment |
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| JP4941908B2 (en) * | 2006-03-23 | 2012-05-30 | 東レフィルム加工株式会社 | Surface protection film |
| JP4745927B2 (en) * | 2006-09-08 | 2011-08-10 | 大倉工業株式会社 | Base film for surface protection film |
| JP2008068564A (en) * | 2006-09-15 | 2008-03-27 | Dainippon Ink & Chem Inc | Surface protecting film |
| JP2010247513A (en) * | 2009-03-25 | 2010-11-04 | Sekisui Chem Co Ltd | Surface protective film |
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