JP2003201356A - Method for winding out and up double-side slippery film coated with cellulose acetate resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for winding out and up a stable double-side slippery film which brings about neither charge nor wrinkle and can be produced in a good yield. <P>SOLUTION: The method comprises coating the back side of the double-side slippery film with a peelable cellulose acetate resin to improve the slipperyness. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for unwinding and winding a double-sided smooth film. More specifically, the invention of this application relates to a method that enables unwinding and winding of a double-sided smooth film that is stable and has a good yield without the film being electrified or wrinkled.

[0002]

2. Description of the Related Art A transparent conductive film, which is widely used as a member in the field of liquid crystal display, is a film which is a substrate and a transparent conductive film is uniformly provided on the surface of the film. A method has been proposed in which a lengthy film is fed from a winding roll, a conductive film is deposited on the surface of the film to form a film, and then the film is wound on a winding roll. The process of unwinding and winding is performed not only in vapor deposition of a functional film such as a conductive film but also in attaching a protective film, inspecting and attaching lead paper.

A substrate film provided with a transparent conductive film is required to have a high degree of optical isotropy and surface smoothness in order to eliminate light scattering and refraction due to molecular orientation. However, on the other hand, the smoother the film, the worse the sideslip between the films.Therefore, when unwinding and winding a film with a smooth surface, the film becomes charged and wrinkles and waviness frequently occur. Was. In particular, the double-sided smooth film had no side slip, and when the unwinding and winding were repeated, charging and wrinkling were always generated. Therefore, when processing a double-sided smooth film from the past, a method in which a slippery film is pasted on the back surface of the double-sided smooth film with an adhesive in advance and the surface is processed and then peeled off, etc. It has been known.

However, when a slippery film is attached to a double-sided smooth film, a small amount of air is introduced between them, and when vapor deposition or the like is performed in the next step, the air is significantly expanded under a high vacuum and the film is expanded. A part of the film may come off and peel off, causing wrinkles, and in severe cases, the entire film may curl. Furthermore, there is a problem that a large amount of gas is generated from the pressure-sensitive adhesive under high temperature and high reduced pressure, and for example, the quality of the transparent conductive film is deteriorated.

Therefore, the invention of this application has been made in view of the above circumstances, and solves the problems of the prior art, prevents the occurrence of charging and wrinkles, and has a continuously stable two-sided smoothness. It is an object to provide a method that enables unwinding and winding of a film.

[0006]

Therefore, the invention of this application provides the following invention in order to solve the above problems.

That is, according to the invention described in claim 1 of this application, prior to processing the surface of the film while continuously transporting the long double-sided smooth film from the unwinding roll to the winding roll. By coating the back surface of the film with an easily slipping and peeling resin, the double-sided smooth film can be easily unwound and taken up.

The applicant of the present invention uses nitrocellulose, cellulose acetate, cellulose butyrate, cellulose acetate butyrate, cellulose propionate, cellulose acetate propionate, methylcellulose as an easily slipping and peeling resin to be coated on the back surface of a double-sided smooth film. , Ethyl cellulose, fibrin derivatives such as hydroxyethyl cellulose, chlorinated rubber, chlorinated hydrocarbon polymers such as chlorinated polyethylene and chlorinated polypropylene, and acrylic acid derivative polymers such as polyurethane acrylate and polyepoxy acrylate. Particle size of 0.1 to 10μ in the above mixture
It has been found that a silica fine powder of m is preferably added, and these inventions have already been filed (Japanese Patent Application No. 2000-
400938).

The present invention is a further improvement of the above-mentioned prior art. That is, it was found that by coating the back surface of a double-sided smooth film with a cellulose acetate resin or a resin containing the resin as a main component, an effect as a slippery and easily peelable resin can be obtained without using silica fine powder. It is a thing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the characteristics as described above, and the embodiments thereof will be described below.

First, the unwinding and winding method for a double-sided smooth film provided by the invention of this application is to continuously transfer a long double-sided smooth film from an unwinding roll to a winding roll, and then to the surface of the film. Prior to the processing, the back surface of the film is coated with an easily slipping / peeling resin. Incidentally, in the invention of this application, the processing on the film surface is not only a step such as a vapor deposition treatment of a conductive film on the film surface, but also a step of attaching a protective film to the film surface, inspecting and sticking lead paper, That is, it means all processes involving unwinding and winding of the double-sided smooth film.

According to the invention of this application, by coating the back surface of the double-sided smooth film with a specific resin or a resin mixture containing the specific resin as a main component, the double-sided smooth film is repeatedly unwound and wound in accordance with various subsequent steps. Even when it is removed, it is possible to prevent the occurrence of electrification and wrinkles and to continuously and stably perform the work.

As the double-sided smooth film, various double-sided smooth films such as plastic films can be used. Further, it may be a completely amorphous film which is widely used in the field of liquid crystals, for example, and has no heat resistance or optical isotropy, that is, no orientation or crystallization. Specific examples of such a double-sided smooth film include polyether sulfone (PES), polycarbonate (PC),
An example is a film made of polyarylate (PAr) or the like. These double-sided smooth films are generally made into products by applying various coatings such as an easy-adhesion coat, a hard coat, and a moisture-proof coat, and the double-sided smooth films in the invention of this application are, of course, It may be applied.

As the easily slipping and easily peeling resin, it is preferable to use a resin containing cellulose acetate as a main component, and these may be used alone or as a mixture. However, when various coatings are applied to the double-sided smoothing film that is the base material, use of the same kind of resin as those coatings that are easy to slip and peel easily, or a resin with a high affinity, makes both sides smoothness smooth. It is difficult to remove the easily slipping and easily peeling resin coating after processing the film, which is not preferable. That is, it is considered that the easily slipping and easily peeling resin is selected so as not to be compatible with or bind to the coating applied to the uppermost layer of the double-sided smooth film. In the invention of this application, the easy peelability is preferably in the range of 5 to 100 g / 24 mm width, and particularly preferably in the range of 20 to 50 g / 24 mm width.

In the invention of this application, by coating the back surface of the double-sided smooth film with an easily slipping / peeling resin, the frictional resistance of the outermost surface of the coating layer is remarkably reduced and the sliding property is improved. Regarding the slipperiness in the present invention, it is preferable that both the dynamic friction coefficient and the static friction coefficient are 0.5 or less.

These easily slippery and easily peelable resins are appropriately diluted with a solvent or the like and dispersed by stirring to give an easily slippery and easily peelable resin composition, which is coated on the back surface of the double-sided smooth film. The solvent is not particularly limited as long as it has sufficient solubility for the above-mentioned easily slippery and easily peelable resin, and those generally used can be used. For example, it is shown as a preferable example to use a solvent for gravure ink, more specifically, a mixed solvent of toluene, methyl ethyl ketone (MEK), ethyl acetate, methylisobutyl ketone (MIBK), isopropyl alcohol and the like.

As the coating method, various conventional coating methods can be adopted. For example,
Gravure coat, roll coat, air knife coat,
A kiss coat, a spray coat, a pouring coat, a brush coat, a solid coat, etc. can be used. For example, it is preferable to sufficiently stir and disperse the coating bath during coating such as during gravure printing. If the coating thickness is too thick, it takes time to dry or becomes bulky, and if it is too thin, an appropriate strength cannot be obtained in the coating layer. Alternatively, a multi-layer coating may be used. In the case of a multi-layer coating, each coating layer is made of one of the above-mentioned easily slipping and easily peeling resins.
Only one kind may be used, or a composite layer composed of two or more kinds may be used.

After the coating, the solvent is removed by heating and drying to obtain an easily slipping and peeling resin coating layer having both a dynamic friction coefficient and a static friction coefficient of 0.5 or less.

According to the method of the present invention described above, there is no occurrence of charging or wrinkles during the unwinding and winding of the double-sided smooth film, and the post-process can be stably performed with a good yield. Hereinafter, embodiments of the present invention will be described in more detail.

[0020]

Example 1 10 parts by weight of cellulose acetate (manufactured by L-20 Daicel Chemical Co., Ltd.) was dissolved in 90 parts by weight of a mixed solution of methyl ethyl ketone: isopropyl alcohol = 90: 10 to prepare a resin coating solution for easy slipping and peeling. Was prepared.

This coating solution was coated on the back surface of a polyether sulfone (PES) film having a width of 640 mm, a thickness of 100 μm and a length of 200 m at a speed of 20 m / min using a gravure coater, and then 12
It was wound while passing through a drying zone at 0 ° C. At this time, the thickness of the coating layer provided on the back surface of the polyether sulfone (PES) was 0.66 μm.

Using a friction measuring device TR-2 manufactured by Toyo Seiki Seisakusho, ITO of a polyether sulfone (PES) film
(Indymium tin oxide) The expected surface was fixed on a metal plate facing upward, and the coating layer of the test polyether sulfone (PES) film mounted on the 63 x 63 mm thread was placed face down on the metal plate. The polyethersulfone (PES) film fixed to the plate was pulled in the horizontal direction under the conditions of a speed of 100 mm / min, a measurement length of 70 mm, a load cell of 10 N and a thread of 200 g. As a result, this polyether sulfone (PES) film had a static friction coefficient μs of 0.45 and a dynamic friction coefficient μd of 0.43.
Met. The peel strength was measured to be 6.0 g /
It was 24 mm. This polyether sulfone (PE
S) The film was rewound on a rewinding machine and was inspected while being unwound and wound, but no wrinkles were formed.

Subsequently, this polyether sulfone (P
On the surface of the ES film, a pressure gradient ion plating device is used to form ITO (indium tin oxide, In
/ Sn = 95/5) was vapor-deposited four times at 10 m / min.
During unwinding and winding at the time of vapor deposition, an extremely stable running state was maintained without wrinkles occurring in all four times. Μs of ITO (indium tin oxide) surface and back surface coating layer after ITO (indium tin oxide) vapor deposition is 0.42, μ
d was 0.36, and the peel strength of the back surface coating layer was 10 g / 24 mm width, and the result was good. By the way I
The surface electrical resistance of the TO (indium tin oxide) surface is 25
It was Ω / □. (Comparative Example 1) In Example 1, 100 parts by weight of cellulose acetate was used as a lubricant and silica fine powder (Sylysia 350, average particle size 1.8 μm, manufactured by Fuji Silysia Chemical Ltd.).
0.2 parts by weight was added and sufficiently stirred to prepare a coating liquid.

This coating solution was coated with a gravure coater as in Example 1, and as a result, μ of the surface coated with polyethersulfone (PES) film and the surface coated with the back surface of polyethersulfone (PES) film was μ
s was 0.39 and μd was 0.39, which was not so different from that without silica addition. The peel strength is 7.0g / 24m.
There was almost no difference in m width.

Therefore, unlike the case of nitrocellulose or the like, in the case of cellulose acetate, it can be used as a slippery / easily peelable material by itself without adding silica fine powder, and the coating bath is contaminated by the silica fine powder. Can be delayed from, and there is no need to use a dedicated,
The economic effect is very large. Example 2 In Example 1, 200 μm of polyether sulfone (PES) was used instead of 100 μm of polyether sulfone (PES), and the back surface was gravure-coated with cellulose acetate twice.

Subsequently, ITO (indium tin oxide) was vapor-deposited on the surface in the same manner by a pressure gradient type ion plating apparatus. Also in this case, unwinding and winding can be performed smoothly, wrinkles etc. do not occur at all, and peeling can be easily performed, and there is no visible residue left on the ITO (indium tin oxide) surface. I couldn't do it.

Of course, the present invention is not limited to the above examples, and it goes without saying that various details can be made.

[0028]

As described in detail above, the present invention is
It is intended to provide a method for preventing the occurrence of electrification and wrinkles and enabling the continuous and stable unwinding and winding of a double-sided smooth film.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C08L 101: 00 C08L 101: 00 F term (reference) 4D075 CA07 CA09 CA22 CA47 DA04 DB48 DB55 DC24 EA07 EB07 EB13 EB22 EB33 EB38 EB56 4F006 AA35 AA36 AA40 AB03 BA09 CA05 DA04 4F100 AJ06B AK01A AK54A AK55A AL05B AT00A BA02 BA10A BA10B CC00B JG03 JL01 JL05 JL14B YY00B

Claims (2)

[Claims] 1. A cellulose acetate is used as a main component on the back surface of a long double-sided smooth film before the surface of the film is processed while being continuously conveyed from a winding roll to a winding roll. A method for unwinding and winding a double-sided smooth film, which is characterized by coating an easily slipping and easily peeling resin. 2. A resin mixture containing 80% or more of cellulose acetate, cellulose acetate butyrate in which 80% or more of the substituents are substituted with acetyl groups, cellulose acetate propionate, and cellulose acetate as the easily slipping / peeling resin. The method for unwinding and winding a double-sided smooth film according to claim 1, wherein