KR101161871B1 - Double-sided adhesive tape for attaching rubbing cloth and rubbing sheet attached with the tape for winding around a roll - Google Patents

Abstract

According to the present invention, a double-sided adhesive tape for attaching a rubbing cloth which can suppress the occurrence of lifting of the double-sided adhesive tape at the interface with a roller and reduce orientation unevenness, and the double-sided adhesive tape and at least one rubbing cloth are integrated. The object of this invention is to provide a rubbing sheet for roller mounting that can cope with a large-sized rubbing roller, and has a pressure-sensitive adhesive layer (I) adhered to a roller on one side of a base film as a solution. A double-sided adhesive tape for applying a rubbing cloth having a pressure-sensitive adhesive layer (II) to which a rubbing cloth is adhered on one side, comprising: a double-sided adhesive tape for applying a rubbing cloth using a film having a tensile stress of 3000 MPa or less as a base film, and A rubbing sheet for roller winding formed by integrating at least one rubbing cloth on the adhesive layer (II) of the double-sided pressure-sensitive adhesive tape so that the pile is on the surface side. .

Description

DOUBLE? SIDED ADHESIVE TAPE FOR ATTACHING RUBBING CLOTH AND RUBBING SHEET ATTACHED WITH THE TAPE FOR WINDING AROUND A ROLL}

1 is an explanatory diagram illustrating an example of a method of connecting a plurality of rubbing cloths;

2 is a cross-sectional view illustrating an example of the configuration of a rubbing sheet for roller winding of the present invention;

3 is an organization chart of the velvet fabric of the V-shaped pile;

4 is an organization chart of a velvet fabric of a fast pile;

5 is an explanatory diagram showing a rubbing test method in an example.

Description of the Related Art

1: base film 2a: pressure-sensitive adhesive layer (I)

2b: adhesive layer (II) 3: rubbing cloth

3a: File 3b: Desktop Cloth

4: double sided adhesive tape 5: release sheet

10: rubbing sheet for roller winding 11, 1 l ': rubbing cloth

12, 12 ': end edge of the rubbing cloth 21: rubbing roller

22: rubbing sheet for roller winding 23: glass plate

31: weft 32: warp

33: file

The present invention relates to a double-sided adhesive tape for attaching a rubbing cloth and a rubbing sheet for roller winding which adhered thereto. More specifically, the present invention is used to wind a rubbing cloth for rubbing a alignment film or the like of a liquid crystal display device on a roller, and suppresses the occurrence of lifting of the double-sided adhesive tape at the interface with the roller, The present invention relates to a double-sided adhesive tape for sticking a rubbing cloth that can reduce orientation unevenness, and a rubbing sheet for roller winding to which the double-sided adhesive tape is attached.

Conventionally, the rubbing process is performed with respect to the orientation film of a liquid crystal display device in order to regulate the orientation of a liquid crystal molecule. The fabric used for this treatment is called a rubbing cloth, and a velvet fabric is used in which the pile is made of fibers such as cotton, rayon, and triacetate. The rubbing cloth is affixed to a rubbing roller via a double-sided adhesive tape, and a rubbing process is performed. By repeating the rubbing process, since the pile of the rubbing cloth is worn out, it is necessary to remove it from the rubbing roller at a predetermined period and replace it with a new rubbing cloth. For this reason, it is desired that the double-sided adhesive tape peels together with the rubbing cloth at the time of exchange, and that no adhesive remains on the roller surface. As for the said double-sided adhesive tape, the adhesive tape which provided the adhesive layer on both surfaces of the base film which generally consists of a polyethylene terephthalate film about 10-30 micrometers in thickness is used until now (for example, a patent See Document 1).

In recent years, in order to increase the size of the liquid crystal display device and improve the productivity, the length of the rubbing roller for fixing the rubbing cloth becomes longer as the size of the glass plate on which a plurality of alignment films called mother glass are formed increases. come. Since the velvet fabric used as the rubbing cloth is usually woven in a width of 110 to 150 cm, in order to cope with a long rubbing roller, a rubbing cloth is divided and a plurality of rubbing cloths are placed in a direction perpendicular to the axis of the rubbing roller. Attaching is a powerful means.

As a method of attaching a plurality of rubbing cloths to a rubbing roller, (1) attaching a double-sided adhesive tape to the rubbing roller first, arranging a rubbing cloth thereon and attaching it, and (2) attaching a plurality of rubbing cloths to one side of the double-sided adhesive tape in advance. In addition, the method of winding up the integrated thing to a rubbing roller can be considered.

As a method of attaching a rubbing cloth to a rubbing roller, a method usually carried out first removes one peeling sheet of a double-sided adhesive tape, sets the exposed adhesive layer as an upper part, and puts the rubbing roller at a predetermined position. After attaching the double-sided adhesive tape to the rubbing roller by rotating the roller, place the pile of the rubbing cloth at a predetermined position and remove the other release sheet of the double-sided adhesive tape stuck to the rubbing roller. Likewise, the rubbing roller with the double-sided adhesive tape is rotated to attach the rubbing cloth.

In the method of (1) above, when a rubbing cloth is applied to both surfaces of a substrate film made of polyethylene terephthalate having a thickness of 25 µm using a double-sided adhesive tape having an adhesive layer, the rubbing roller and the double-sided adhesive tape Although lifting does not occur in between, since the pile of a rubbing cloth is inclined in a slightly oblique direction, there exists a problem that a rubbing cloth shifts by the pressure at the time of sticking.

Moreover, in the method of said (2), when sticking a rubbing cloth after using a double-sided adhesive tape in which the adhesive layer was formed on both surfaces of the base film which consists of a polyethylene terephthalate of the conventional thickness of 25 micrometers, and sticking to a rubbing roller, Although a rubbing cloth can be firmly adhered on a double-sided adhesive tape, and it can be firmly adhered to a rubbing roller with high precision, a float arises between a rubbing roller and a double-sided adhesive tape.

This phenomenon is considered as follows. The base material and the rubbing cloth itself of the double-sided adhesive tape alone have low rigidity (PET 25 µm: GURLEY stiffness of about 80 mN, and rubbing cloth: Gurley stiffness of about 400 to 800 mN). Therefore, in the method of said (1), it can stick without generating floating. However, when these laminates are integrated, the Gur stiffness is about 5000 to 8000 mN, which significantly increases the rigidity, and when these laminates are attached to the cylindrical rubbing rollers, internal stress due to the difference between inside and outside is generated. It is thought that the lifting occurs between the tapes (Gull rigidity: in accordance with J. TAPPI paper pulp test method No. 40, using a Gull type softness tester manufactured by Toyo Seiki Seisakusho Co., Ltd.). The double-sided tape base material and the rubbing cloth were measured on both sides, and the average value was taken as the stiffness.The laminate was affixed to a rubbing cloth with a pressure-sensitive adhesive layer for sticking a rubbing cloth on one side of the double-sided adhesive tape base material. Similarly measured).

In addition, a part of the file of the cutting point of the rubbing cloth located at the center of the rubbing roller is pulled out of the fabric of the base fabric, and the rubbing treatment is performed while the file length is long, or the file missing during the rubbing is rolled into another file part. When the rubbing treatment is performed, an alignment nonuniformity occurs in the alignment film. Therefore, it is necessary to prevent the file of a cut surface from falling out easily.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 2002-220570

Under the circumstances, the present invention is used to apply a rubbing cloth for rubbing a alignment film or the like of a liquid crystal display device to a rubbing roller, and is intended to solve the problem of "simplification and certainty of the pasting process, and a large glass substrate." In order to cope with this, the double-sided adhesive tape for sticking the rubbing cloth which suppresses the occurrence of the lifting of the double-sided adhesive tape at the interface with the rubbing roller, and the long-length roller in which the double-sided adhesive tape and at least one sheet of cloth are integrated. It aims at providing the rubbing sheet for roller winding which can reduce the orientation nonuniformity and orientation defect which are present.

MEANS TO SOLVE THE PROBLEM As a result of earnestly researching in order to achieve the said objective, when the rubbing sheet for rubbing rollers to which the double-sided adhesive tape and one or more rubbing cloths were integrated, the lifting occurs at the interface of a rubbing roller and an adhesive layer. In order to suppress this, the internal stress which arises when affixing the integrated rubbing sheet for rubbing rollers to a roller was made to relieve by the base film of a double-sided adhesive tape, and the following insight was obtained. In order to prevent the pile of the cut surface of the rubbing cloth from coming off, the base yarn made of the thermoplastic synthetic fibers constituting the base cloth is in a fusion state with other base yarns or the thermoplastic synthetic fibers of the base yarns are deformed by melting. Focusing on what should be done, the following insights were obtained.

That is, the present invention,

(1) A double-sided adhesive tape for sticking rubbing cloth having an adhesive layer (I) adhered to a roller on one side of the base film and an adhesive layer (II) on which a rubbing cloth is adhered on the other side. , Double-sided adhesive tape for rubbing cloth adhesion, characterized in that the film using a tensile stress of less than 3000MPa at 1% stretching,

(2) the double-sided adhesive tape for sticking rubbing cloth according to (1), wherein the tensile stress at the time of 1% stretching of the base film is 200 to 2600 MPa;

(3) The double-sided adhesive tape for sticking the rubbing cloth according to (1) or (2), wherein the base film is a polyolefin resin film;

(4) The double-sided adhesive tape for sticking the rubbing cloth according to any one of (1) to (3), wherein the base film is stretched by 10% and the stress after 1 minute of stretching stop is 20 N / 15 mm or less.

(5) At least one rubbing cloth is attached to the pressure-sensitive adhesive layer (II) of the double-sided adhesive tape for rubbing cloth sticking according to any one of (1) to (4) so that the pile is on the surface side, and is integrated. Rubbing sheet for roller winding,

(6) A plurality of rubbing cloths are joined together so that the edges of the corresponding fabric ends correspond to each other, the double-sided adhesive tape is continuously attached over the joints formed by the butt edges, and the plurality of rubbing cloths are connected to each other (5 The rubbing sheet for roller winding according to item),

(7) The rubbing sheet for roller mounting according to (6), wherein the seam of the rubbing cloth is linear, and the angle of the rubbing cloth with respect to the rubbing direction is from 0 degree to 45 degrees.

(8) Rubbing fabrics, velvet fabrics in which piles are woven in the form of fast piles on a base fabric, the piles being cotton, rayon, cellulose acetate, polynosic, tencel, nylon, polyester, and vinylon For roller winding according to any one of (5) to (7), wherein the fiber selected from the above is used, and both or one of the warp and weft of the base yarn constituting the base cloth is made of thermoplastic synthetic fibers. A rubbing sheet, and

(9) The fabric end edge of the rubbing cloth is melted, and at this end edge, the base yarn made of thermoplastic synthetic fibers constituting the base cloth is in a fusion state with other base yarns, or the thermoplastic synthetic fibers of the base yarn. It is to provide the rubbing sheet for roller mounting according to any one of (5) to (8), which is in a state deformed by melting.

The double-sided adhesive tape for sticking rubbing cloth of the present invention is a double-sided adhesive tape for winding a rubbing cloth on a roller, and has a pressure-sensitive adhesive layer (I) adhered to a roller on one side of the base film, and a rubbing cloth is adhered on the other side. It has adhesive layer (II) to become.

As described later, the double-sided adhesive tape is preferably used for the production of the roller-stacking rubbing sheet obtained by attaching at least one rubbing cloth to the pressure-sensitive adhesive layer (II) so that the pile is on the surface side and integrating it. do. The rubbing sheet for roller winding is wound on a roller via this adhesive layer (I). At this time, since the installation radius of the base fabric portion of the rubbing cloth and the base film of the double-sided adhesive tape is different, a difference between inside and outside occurs, and as a result, internal stress occurs. This internal stress acts on the side with weak adhesive force, and when a normal double-sided tape for rubbing is used, it will become a cause of lifting at the interface with a roller.

In the double-sided adhesive tape of this invention, in order to absorb this internal stress and suppress generation | occurrence | production of the said lifting, as a base film, the film which has a specific property, ie, the film whose tensile stress at the time of 1% extending | stretching is 3000 MPa or less This is used. When the tensile stress exceeds 3000 MPa, the base film does not sufficiently absorb the internal stress, and thus the object of the present invention cannot be achieved. In terms of absorption of internal stress, the preferred value of the tensile stress at the time of 1% stretching is in the range of 200 to 2600 MPa. In addition, the tensile stress at the time of 1% extending | stretching of the said base film is the value measured based on JISK7127.

As the base film, a base film is stretched 10%, and a film having a stress of 20 N / 15 mm or less after 1 minute of stretching stop is preferably used. When the stress exceeds 20 N / 15 mm, the base film does not sufficiently relax the stress, and the object of the present invention can hardly be achieved. In terms of stress relaxation, a more preferable value of the stress is in the range of 4-18 N / 15 mm. In addition, the base film is stretched by 10% and the stress after 1 minute of stretching stop is a value measured as follows. That is, a base sheet is cut out to width 15mm and length 150mm, and a test piece is obtained. The test piece was installed at a distance of 100 mm between chucks using Tenenron RTA-100 manufactured by Orientecsha, and was measured at a speed of 200 mm / min.

As a base film in the double-sided adhesive tape of this invention, if the said characteristic is satisfied, there will be no restriction | limiting in particular about the raw material, Various things can be used. For example, polyolefin resin, soft vinyl chloride resin, etc. are used preferably. There is no restriction | limiting in particular as polyolefin resin, For example, homopolymers of alpha-olefins, such as ethylene, propylene, butene-1,3-methylbutene-1,3-methylpentene-1,4-methylpentene-1, These copolymers or copolymers with these and other copolymerizable unsaturated monomers are mentioned. Representative examples include polyethylenes such as high density, medium density, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, propylene-ethylene block copolymers and random copolymers, and propylene-ethylene-diene. Soft polypropylenes such as compound copolymers, polybutene-1, poly4-methylpentene-1 and the like. These may be used independently and may be used in combination of 2 or more type. Among these, low density polyethylene and linear low density polyethylene are particularly suitable.

On the other hand, as a vinyl chloride resin in a soft vinyl chloride resin, for example, a copolymer mainly containing polyvinyl chloride and vinyl chloride having a number average degree of polymerization of about 800 to 2500 (for example, an ethylene-vinyl chloride copolymer) , Vinyl acetate-vinyl chloride copolymers, vinyl chloride-halogenated olefin copolymers, and the like) or mixtures with other compatible resins mainly composed of polyvinyl chloride or vinyl chloride copolymers thereof. have. 1 type of these vinyl chloride resins may be used, and may be used in combination of 2 or more type.

A soft vinyl chloride resin can be prepared by mix | blending about 15-50 weight part plasticizer with respect to 100 weight part of said vinyl chloride resins.

As said plasticizer, For example, phthalic acid derivatives, such as di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, diisodecyl phthalate; Isophthalic acid derivatives such as diisooctyl isophthalate; Adipic acid derivatives such as dioctyl adipate; In addition, tricresyl phosphate, trissilenyl phosphate, epoxidized soybean oil and the like are used.

The thickness of the base film is not particularly limited, but is usually selected in the range of 10 to 120 µm, preferably 20 to 100 µm.

In this invention, physical or chemical surface treatments, such as an oxidation method and a quenching method, can be added to this base film as needed for the purpose of improving adhesiveness with the adhesive layer formed on it. Examples of the oxidation method include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like. For example, sandblasting method and solvent treatment method may be used. have. Although these surface treatment methods are suitably selected according to the kind of film, generally, the corona discharge treatment method is used preferably from a viewpoint of an effect, operability, etc.

In the double-sided adhesive tape of this invention, the adhesive layer (I) adhering to a roller is formed in one side of the said base film, and the adhesive layer (II) in which a rubbing cloth is adhered to the other side is formed. There is no restriction | limiting in particular as an adhesive used for the said adhesive layers I and II, Arbitrary things can be suitably selected from those conventionally used as an adhesive in the double-sided adhesive tape for rubbing. For example, acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, silicone pressure-sensitive adhesives, polyurethane pressure-sensitive adhesives, polyester pressure-sensitive adhesives and the like can be used. Among them, generally, acrylic pressure-sensitive adhesives and rubber pressure-sensitive adhesives are often used.

As said acrylic adhesive, it is selected from the copolymer containing (meth) acrylic acid ester homopolymer, 2 or more types of (meth) acrylic acid ester units, and the copolymer of (meth) acrylic acid ester and another functional monomer as a main component, for example. What contains at least 1 sort is used. As said (meth) acrylic acid ester, a butyl (meth) acrylate, a pentyl (meth) acrylate, a hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, (meth) acrylic acid nonyl, (meth) Decyl acrylate, etc. are mentioned. As the functional monomer, for example, amide groups such as hydroxyl group-containing monomers such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate, (meth) acrylamide, and dimethyl (meth) acrylamide Carboxylic acid group containing monomers, such as a monomer and (meth) acrylic acid, etc. are mentioned.

As said rubber-based adhesive agent, as a main component, it is a natural rubber, a polyisoprene rubber, a polyisobutylene, a polybutadiene rubber, a styrene- butadiene- styrene block copolymer, a styrene- isoprene- styrene block copolymer, etc., for example. One containing at least one selected is used.

A crosslinking agent, a tackifier, antioxidant, a filler, etc. can be mix | blended with these adhesives as needed.

Moreover, in order to suppress that an adhesive remains on a roller at the time of exchange of a rubbing cloth, it is preferable to make adhesive force with the roller of the adhesive layer (I) smaller than adhesive force with the rubbing cloth of the adhesive layer (II). As an adjustment method of adhesive force, the method of using a weak adhesive type adhesive for adhesive layer (I), the strong adhesive type adhesive for adhesive layer (II), and the method of making adhesive layer (I) thinner than adhesive layer (II) , And a method of combining these methods. Here, the adhesive agent of a weak adhesive type can be prepared by using what has a high molecular weight or the thing which raised the crosslinking degree as a resin component which comprises an adhesive, for example.

In this invention, the thickness of adhesive layer (I) is 10-70 micrometers normally, Preferably it is selected in the range of 20-50 micrometers, and the thickness of adhesive layer (II) is 30-80 micrometers normally, Preferably Is selected in the range of 40 to 70 µm.

Moreover, when sticking on a roller, the adhesive layer (I) can be formed so that the air which remains between the said adhesive layer (I) and a roller does not remain. By forming this fin, air flows out through the fin at the time of sticking, and it can suppress that the air which remains between adhesive layer I and a roller remains. The shape of the fin may be any shape as long as the remaining air at the time of adhesion can be suppressed. For example, a stripe (stripe) shape, an island shape, an indefinite shape, a combination of these shapes, etc. are mentioned.

As for the total thickness of the double-sided adhesive tape of this invention, 200 micrometers or less are preferable at the point of the internal stress reduction, the nonuniformity of product thickness, etc.

As for the double-sided adhesive tape of this invention, it is preferable that the surface of adhesive layer (I and II) is coat | covered with a peeling sheet from a handling point. Therefore, although each said adhesive layer may apply | coat directly to both surfaces of a base film, and may form an adhesive layer, after apply | coating an adhesive on a peeling sheet and forming an adhesive layer, it adheres to a base film, and transfers the said adhesive layer, and peels It is preferable to leave the sheet as it is. Moreover, what is necessary is just to form the recessed part corresponding to the said recessed part in a peeling sheet in the case of forming a fin in the adhesive layer (I) in this method.

As the release sheet, for example, paper substrates such as glassine paper, coated paper, and high-quality paper, laminated papers laminated with thermoplastic resins such as polyethylene on these paper substrates, or polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Although there is no restriction | limiting in particular about the thickness of this peeling sheet which can apply | coat the peeling agent, such as silicone resin, to plastic films, such as polyester films, such as polyester films, polypropylene, and polyethylene, etc., Usually, 20- It is about 150 micrometers.

In order to make it easy to peel at the time of sticking a roller or a rubbing cloth, this peeling sheet is equipped with the magnitude | size which can be extended from an adhesive layer, forms a cutting line, or makes a peeling sheet two sheets, and is an adhesive It is possible to overlap them in the vicinity of the center of the layer.

There is no restriction | limiting in particular about the rubbing cloth affixed on the adhesive layer (II) of the double-sided adhesive tape of this invention, Conventionally, it can select suitably from the rubbing cloth conventionally used for rubbing processes, such as an orientation film in a liquid crystal display device. have. Representative of this rubbing cloth is velvet fabric. As for the pile of the rubbing cloth, fibers such as cellulose acetate such as cotton, rayon, and triacetyl cellulose, polynosic, tencel, nylon, polyester, vinylon, etc. are used, and the base yarns (weft, warp yarn) forming the base fabric are cotton, rayon, etc. Cellulose-based fibers are often used.

3 and 4 are representative organization charts of the velvet fabric used in rubbing cloth. Reference numeral 31 is a weft yarn, 32 is a warp yarn, and 33 is a file. 3 is called what is called a V-shaped pile, and since the pile 33 is pressed by one weft 31, the pile 33 tends to fall out. 4 is called a fast pile, and since it is pressed by the three weft yarns 31, the pile 33 is hardly pulled out. In any structure, the pile 33 is gripped by the weft yarn 31. The velvet fabric used as a rubbing cloth is hardened by coating a resin such as vinyl acetate or acrylic resin on the side where the pile 33 of the base fabric is not provided, but the pile 33 is not completely fixed, and in particular, weft In the case of cutting the fabric in the direction of (31), the warp yarn 32 of the base fabric is cut, and easily falls out when the pile 33 is at the end of the fabric. Thus, by using thermoplastic synthetic fibers such as polyester and polypropylene on both or one side of the warp 32 and the weft 31 of the base fabric of the velvet fabric, the heat-fusion cutting is performed with a blade heated to cut the velvet fabric. In this case, the cut base yarns are melt-bonded to each other, or the tip ends of the base yarns are in a deformed state such as a spherical shape or a flat shape to prevent peeling and dropping of the pile 33. At that time, when the velvet fabric is woven into the fast pile structure as shown in Fig. 4, the effect of fusion bonding is greater. Velvet density is the range of diameter 12-50 (piece / cm) and stomach 30-100 (piece / cm) normally. In addition, the thickness of the base fabric is usually in the range of 0.1 to 1.0 mm, and the thickness of the pile length including the base fabric is usually 1.5 to 3.5 mm.

Next, the rubbing sheet for roller winding of the present invention is integrated by pasting at least one rubbing cloth so that the pile is on the surface side to the pressure-sensitive adhesive layer (II) of the double-sided pressure-sensitive adhesive tape described above.

This roller winding rubbing sheet can be manufactured, for example by the method shown below. First, one or a plurality of rubbing cloths cut to a predetermined size are placed on a flat plate-shaped pedestal so that the pile becomes the lower side. Next, a double-sided adhesive tape having a release sheet affixed to both sides cut to a predetermined size is placed on the other flat plate-shaped pedestal so that the adhesive layer (II) is on the outside, and the release sheet on the adhesive layer (II) side is removed and exposed. The pasted adhesive layer (II) is lightly bonded on the base fabric of the rubbing cloth. Finally, the rubbing cloth and the double-sided pressure-sensitive adhesive sheet are pressed together with a pressure roller in the order of the pile from one direction on the pile side so as to be completely integrated. At this time, if the double-sided adhesive tape and the plate-shaped pedestal are preliminarily executed at a temperature of 50 to 70 ° C., the adhesive easily penetrates into the textile fibers of the base fabric of the rubbing cloth, and the adhesion is assured.

In the case of connecting a plurality of rubbing cloths, for example, as shown in FIG. 1, the end edges 12 and 12 'of the respective rubbing cloths 11 and 11' are faced to correspond to each other, and the butt end ends It is preferable that the double-sided adhesive tape is attached continuously so that the adhesive layer (II) may contact | connect the joint formed by the edge, and it connects several pieces of rubbing cloth (two rubbing cloth in FIG. 1), and is integrated. .

In this case, the seam of the rubbing cloth is straight, and the angle (θ in FIG. 1) with respect to the rubbing direction of the rubbing cloth suppresses the peeling of the end of the rubbing sheet for roller winding from the roller and the peeling and dropping of the pile. From a point, 0 degree or more and 45 degrees or less are preferable, and the range of 0-30 degree is especially preferable. Moreover, the range (0.5 in FIG. 1) between the cloth end edge and the cloth end edge of a joint is preferable in the range of 0.5-5 mm. The piles are arranged in parallel with the warp yarns as shown in FIGS. 3 and 4. Although the rubbing direction of a rubbing cloth and the warp yarn of a rubbing cloth are normally set in parallel, you may leave a little non-parallel (about 2 degrees-about 10 degrees).

The size of the rubbing sheet for roller winding integrated in this way depends on the diameter and length of the roller to be used. As a roller, since about 60-300 mm in diameter and about 500-3000 mm in length are used, the size of the rubbing sheet for roller winding is about 480-2950 mm in length, and about 180-950 mm in width. Moreover, the number of sheets of the attached rubbing cloth is 1-3 pieces normally, Preferably it is 1-2 sheets.

2 is a cross-sectional view illustrating an example of the configuration of the rubbing sheet for roller winding of the present invention. The rubbing sheet 10 for roller winding is a base fabric 3b on the adhesive layer (II2b) of the double-sided adhesive tape 4 in which the adhesive layer (I2a) and the adhesive layer (II2b) were formed on both surfaces of the base film 1, respectively. The rubbing cloth 3 which has the pile 3a is stuck on top, and the peeling sheet 5 is stuck to the adhesive layer I2a.

In order to roll the roller sheet rubbing sheet of this invention on a roller, the roller sheet rubbing sheet is first mounted so that a pile may become a lower side, the peeling sheet of the adhesive layer (I) side is peeled off, and an adhesive Expose layer (I). Next, a roller is placed on this pressure sensitive adhesive layer (I), and the rubbing sheet is wound on the roller via the pressure sensitive adhesive layer (I) by rolling the roller. The roller on which the rubbing sheet is wound in this way is provided in the rubbing processing apparatus and is used for rubbing processing such as an alignment film in the liquid crystal display device.

In the base film of the double-sided adhesive tape of the present invention, a base film having a tensile stress of 3000 MPa or less at 1% stretching, preferably 10% elongating the film, and having a stress of 20 N / 15 mm or less after 1 minute of elongation stop, Since it is used, the internal stress generated by the difference between inside and outside of the base film of the rubbing cloth and the base film of the double-sided adhesive tape can be absorbed by the base film, and as a result, the double-sided adhesive tape at the interface with the roller. The occurrence of excitation can be suppressed. Therefore, when the said orientation film is rubbed using this rubbing processing apparatus, the orientation film in which the orientation nonuniformity was suppressed can be obtained.

Moreover, in the rubbing sheet for roller winding of the present invention, the velvet fabric used as the rubbing cloth is a base yarn constituting the base cloth, by using a thermoplastic synthetic fiber, by employing a hot melt cutting method for cutting the rubbing cloth, The cut base yarns are melt-bonded to each other, or the tip ends of the base yarns are deformed in a spherical shape or a flat shape to prevent peeling or dropping of the pile, and as a result, the alignment defect and orientation unevenness are further improved. It can further reduce and can respond effectively also to a long rubbing roller.

[Examples]

Next, although an Example demonstrates this invention in detail, this invention is not limited at all by these examples.

In addition, the tensile stress at the time of 1% extending | stretching of a base film and 10% of base film were extended, and the stress after 1 minute of elongation stop was measured in accordance with the method as described in the specification main body.

(Example 1)

(1) Production of double-sided adhesive tape

A 50-micrometer-thick polyethylene film (abbreviated as PE 50) obtained by using a mixture of low density polyethylene and a linear low density polyethylene having a weight ratio of 90:10 was used as a base film. The tensile strength at the time of 1% elongation of this PE 50 was 380 Mpa, 10% elongation was carried out, and the stress after 1 minute of elongation stop was 6.4 N / 15 mm.

An acrylic adhesive [Toyo Ink Co., Ltd. product, brand name "Orivine BPS 3841"] is apply | coated to the peeling process layer surface of the 90-micrometer-thick peeling sheet [Lintec Co., Ltd., brand name "SP-11BY"], and it is made to dry 30 micrometers of adhesive layer I (roller side) were formed. Subsequently, this peeling sheet was stuck to one surface of the said PE 50 via the said adhesive layer (I).

Next, an acrylic adhesive [Toyo Ink Co., Ltd. product, brand name "Orivine BPS 8170"] is apply | coated to the peeling process layer surface of the peeling sheet [Lintec Co., Ltd., brand name "SP-8K"] of thickness of 65 micrometers, It dried and formed adhesive layer (II) (cloth side) of thickness 50micrometer. Subsequently, this peeling sheet was stuck to the other surface of the said PE 50 via the said adhesive layer (II), and the double-sided adhesive tape with a peeling sheet was produced. This was cut into width 300mm and length 550mm, and it was made to help manufacture of the rubbing sheet for roller winding.

(2) Production of the roller sheet rubbing sheet

The peeling sheet on the adhesive layer (II) side of the double-sided adhesive tape produced in said (1) was peeled off, and the rubbing cloths 1 and 2 of the properties shown in Table 1 were cut | disconnected to width 263 mm and length 480 mm, respectively. By the method described above, a double-sided adhesive tape was placed on the surface of the base fabric side so that the pressure-sensitive adhesive layer (II) was in contact with each other and lightly fixed. Next, the roller sheet rubbing sheet | seat formed by inverting and applying pressure from the pile side and integrating was produced. In addition, the excess double-sided adhesive tape was removed and removed. In addition, the said production was performed by heating a double-sided adhesive tape and a plate-shaped pedestal at 55 degreeC.

(3) evaluation

The rubbing sheet for roller winding produced in said (2) was made so that the rubbing cloth side might become lower, and the peeling sheet was removed and the adhesive layer (I) was exposed. Subsequently, on the pressure-sensitive adhesive layer (I), a cylindrical glass roller having a length of 500 mm and a diameter of 84 mm was placed and the roller rubbing sheet formed integrally was wound on the roller while rotating the roller in the direction of the pile.

Next, after being wound on a roller, it was left to stand for 24 hours, and then the adhered state of the roller and the double-sided adhesive tape was visually observed inside the cylindrical glass, and the adhesion was evaluated according to the following criteria.

Criteria

(Circle): It does not show generation | occurrence | production, etc. between a roller and a double-sided adhesive tape by visual observation.

X: Lifting is seen between the roller and double-sided adhesive tape by visual observation.

The results are shown in Table 2.

(Example 2)

(1) Production of double-sided adhesive tape

In Example 1 (1), a soft polyvinyl chloride film [Lintec Co., Ltd. product, brand name "MP TOME 80", a plasticizer (di-n-octyl phthalate) of 80 micrometers in thickness was used as a base film. It carried out similarly to Example 1 (1) except having used 20 weight part containing (abbreviation as PVC 80) with respect to 100 weight part.

In this case, the tensile strength at the time of 1% extending | stretching of PVC 80 was 1340 Mpa, it extended | stretched 10% and the stress after 1 minute of elongation stop was 15.9 N / 15 mm.

(2) Production of the roller sheet rubbing sheet

Using the double-sided adhesive tape produced in the above (1) and the rubbing cloths 1 and 2 shown in Table 1, a rubbing sheet for roller winding was produced in the same manner as in Example 1 (2).

(3) evaluation

Evaluation was performed similarly to Example 1 (3) about the rubbing sheet for roller winding produced in said (2). The results are shown in Table 2.

(Comparative Example 1)                     

(1) Production of double-sided adhesive tape

Example 1 (1) WHEREIN: Except having used the 25-micrometer-thick polyethylene terephthalate film [Toray Co., Ltd. product name, "Lumira-25T-70"] (abbreviated as PET 25) as a base film In the same manner as in Example 1 (1).

In this case, the tensile strength at the time of 1% elongation of PET25 was 5330 Mpa, it extended | stretched 10%, and the stress after 1 minute of elongation stop was 26.4 N / 15 mm.

(2) Production of the roller sheet rubbing sheet

Using the double-sided adhesive tape produced in said (1) and the rubbing cloth (1 and 2) of the properties shown in Table 1, the rubbing sheet for roller mounting was produced like Example 1 (2).

(3) evaluation

Evaluation was performed similarly to Example 1 (3) about the rubbing sheet for roller winding produced in said (2). The results are shown in Table 2.

Loving cloth (1) Loving cloth (2) file 60 cotton double yarn 60 cotton double yarn Velvet desktop thread warp threads Polyester 66dTex Polyester 168dTex weft Polyester 166dTex Polyester 168dTex Velvet Density
(Pcs / cm) circa 15.8 17.5 top 40.3 85.1 Fabric thickness (mm)   0.25  0.6 Pile length including fabric (mm)  2.5  2.3

Evaluation of Adhesion of the Roller Sheeting Rubbing Sheet Loving cloth (1) Loving cloth (2) Example 1 O O Example 2 O 0 Comparative Example 1 X X

As is apparent from Table 2, both the roller-coated rubbing sheet using PE 50 as the base film (Example 1) and the roller-coated rubbing sheet using the PVC 80 as the base film (Example 2) were both roller and double-sided adhesive. No occurrence of lifting or the like was observed between the tapes. On the other hand, in the rubbing sheet for roller winding (Comparative Example 1) using PET 25 as a base film, the generation | occurrence | production of the lifting was seen between a roller and a double-sided adhesive tape.

(Test Example 1)

Using the rubbing cloth 1 shown in Table 1, heat-melting and cutting (hereinafter, θ15 °) into the shapes shown in Fig. 1 (a = 750 mm, b = 650 mm, c = 407 mm, θ = 15 °). One set of two pieces of rubbing cloth (1) is prepared, and heat-melted and cut into the shapes shown in Fig. 1 (a = 940 mm, b = 460 mm, c = 407 mm, θ = 50 °) ( Hereinafter, 1 set of 2 pieces of (theta) 50 degrees rubbing cloth (1) were prepared.

(1) Preparation of rubbing sheet for roller winding and winding to roller

The double-sided adhesive tape produced in Example 1 (1) was cut into a width of 450 mm and a length of 1550 mm, and fixed to the flat plate-shaped pedestal with the pressure-sensitive adhesive layer (II) on the top, and the peeling sheet removed. The adhesive layer (II) was exposed.

Subsequently, a pair of θ15 ° rubbing cloth 1 is attached to another flat plate-shaped pedestal so that the pile side is lowered so that wrinkles and distortions do not enter, and as shown in FIG. A double-sided pressure-sensitive adhesive tape was placed on the cloth side so that the pressure-sensitive adhesive layer (II) was brought into contact with each other, and then lightly applied. The excess double-sided adhesive tape was separated and removed. The gap between the two rubbing cloths was 2 mm. Thus, the rubbing sheet for roller winding ((theta) = 15 degrees) was produced.

Moreover, the roller winding rubbing sheet ((theta) = 50 degrees) was produced like the above except having used the (theta) 50 degrees rubbing cloth (1) instead of the (theta) 15 degrees rubbing cloth (1).

Thus obtained roller winding rubbing sheet (θ = 15 °) and roller winding rubbing sheet (θ = 50 °) are inverted, respectively, and the peeling sheet is peeled off. An aluminum rubbing roller of 1500 mm was placed on it, and the rubbing sheet for roller winding formed integrally was brought into close contact while being rotated in the direction of the pile.

(2) Evaluation by rubbing test

5 is an explanatory diagram showing a rubbing test method.

As shown in FIG. 5, the rubbing process of the glass plate 23 which made the groove amount d 0.5 mm was carried out using the rubbing roller 21 which wound the rubbing sheet 22 for roller winding. It rotated for 3 minutes at 1200 rpm, and the surface of the glass plate was observed, and this was repeated 6 times and rubbed for 18 minutes. The evaluation result after a rubbing process is as follows.

In the case of the roller-stacking rubbing sheet (θ = 15 °) using the θ15 ° rubbing cloth 1, it was satisfactory without falling off the pile from the joint. On the other hand, in the case of the roller mounting rubbing sheet (θ = 50 °) using the θ50 ° rubbing cloth (1), there is no falling off of the pile from the seam, but the rubbing sheet for roller winding at the tip of the cut surface of 50 ° is removed from the roller. Partially peeled off, causing the file to fall off partially.
The double-sided adhesive tape for rubbing cloth of the present invention is used to wind a rubbing cloth for rubbing a alignment film or the like of a liquid crystal display device on a roller, and the occurrence of lifting of the double-sided adhesive tape at an interface with the roller is generated. Can be suppressed and orientation nonuniformity can be reduced. Moreover, by using this double-sided adhesive tape for a rubbing cloth sticking, the rubbing sheet for roller winding which can respond to a large size rubbing roller can be provided.

According to the present invention, a rubbing cloth for rubbing the alignment film or the like of a liquid crystal display device is used to wind the roller, and the occurrence of lifting of the double-sided adhesive tape at the interface with the roller is suppressed to reduce the orientation unevenness. A double-sided adhesive tape for attaching a rubbing cloth and a double-sided adhesive tape and one or more rubbing cloths can be integrated to provide a rubbing sheet for roller mounting that can cope with a large rubbing roller.

Moreover, in the rubbing sheet for roller winding of the present invention, the velvet fabric used as the rubbing cloth is cut by adopting a hot melt cutting method for cutting the rubbing cloth by selecting a base thread constituting the base cloth. And the edges of the base thread become a deformed state such as a sphere or a flat shape, and the peeling or dropping of the pile can be prevented. As a result, the alignment defect and the orientation unevenness are further increased. It can reduce, and can respond effectively also to a long rubbing roller.

Claims (15)

A pressure-sensitive adhesive layer (II) having a pressure-sensitive adhesive layer (I) adhered to a roller on one side of a base film composed of any one of low density polyethylene, linear low-density polyethylene, or a mixture thereof, and a rubbing cloth adhered on the other side (II). In the double-sided pressure-sensitive adhesive tape for rubbing cloth having), as the base film, the base film is stretched 10%, the stress after 1 minute of elongation stop is 20N / 15mm or less, and the tensile stress at the time of 1% stretching is A double-sided adhesive tape for attaching a rubbing cloth, using a film of 3000 MPa or less. (However, the base film is stretched 10%, and the stress after 1 minute of extension stop, the test piece obtained by cutting the base sheet into a width of 15 mm and a length of 150 mm was installed at a distance of 100 mm between chucks using TENSIRON RTA-100 manufactured by Oriente. Tensile measurement at speed 200 mm / min) The method of claim 1, A double-sided pressure sensitive adhesive tape for rubbing cloth, wherein the tensile stress at the time of 1% stretching of the base film is 200 to 2600 MPa. The rubbing sheet for roller mounting according to claim 1 or 2, wherein at least one rubbing cloth is attached to the pressure-sensitive adhesive layer (II) of the double-sided adhesive tape for rubbing cloth pasting so that the pile is on the surface side. The method of claim 3, A plurality of rubbing cloths are formed by abutting a plurality of pieces of rubbing cloth so as to correspond to each other, and affixing double-sided adhesive tapes over the joints formed by the butt edges, and connecting a plurality of rubbing cloths. Wear rubbing sheets. 5. The method of claim 4, The seam of the rubbing cloth is linear, and the rubbing sheet for roller mounting characterized in that the angle with respect to the rubbing direction of the seam of the said rubbing cloth is 0 degree | time or more and 45 degrees or less. The method of claim 5, A rubbing cloth, which is a velvet fabric in which a pile is piled on a base fabric in the form of a fast pile, and is woven, wherein the pile is cotton, rayon, cellulose acetate, polynosic, tencel, A rubbing sheet for roller winding comprising a fiber selected from nylon, polyester, and vinylon, and both or one of warp and weft of the base yarn constituting the base fabric is made of thermoplastic synthetic fibers. The method of claim 6, The fabric end edge of the rubbing cloth is melted, and at this end edge, the base yarn made of thermoplastic synthetic fibers constituting the base cloth is fused with other base yarns, or the thermoplastic synthetic fibers of the base yarn are melted. A rubbing sheet for roller winding, wherein the rubbing sheet is in a deformed state. delete delete delete delete delete delete delete delete

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