KR20100134096A - Adhesive composition, surface protective film, and mother glass surface protective film for flat panel display - Google Patents

Abstract

It is easy to adhere a surface protection film to a glass surface, and after peeling a surface protection film after that, the adhesive composition which can wash | clean and remove the residue resulting from a surface protection film (middle pressure sensitive adhesive layer) easily, an adhesive layer, And it is for providing the mother glass surface protection film for flat panel displays using these.
It provides the adhesive composition characterized by containing 0.01-2 weight part of alkylene oxide group containing compounds with respect to 100 weight part of thermoplastic resins.

Description

Adhesive composition, surface protection film, and mother glass surface protection film for flat panel displays {ADHESIVE COMPOSITION, SURFACE PROTECTIVE FILM, AND MOTHER GLASS SURFACE PROTECTIVE FILM FOR FLAT PANEL DISPLAY}

The present invention relates to an adhesive composition. More specifically, it relates to the adhesive layer using it and the mother glass surface protection film for flat panel displays using them.

Although a glass substrate is used for manufacture of flat panel displays, such as a liquid crystal display, a plasma display panel, and an organic electroluminescent display, the glass plate manufactured at the factory is distributed (transported) as a mother glass, and this is processed into a glass substrate. If the glass surface is damaged due to conveyance or storage of the mother glass, furthermore, transportation accompanied with shipment, storage at the customer, etc., it is a cause of lowering the yield and adversely affecting the quality. Is attached.

Mother glass for flat panel display with a surface protection film is delivered to the panel manufacturer, and the surface protection film is peeled off there, but when it is difficult to peel (hard to peel), workability deteriorates and peeling is incompletely performed. The problem of peeling defect arises.

Moreover, after peeling, although the residue cleaning and removal of a surface protection film are performed using a washing | cleaning liquid etc., the problem also arises that a residue does not fall easily from a glass surface.

Further, problems such as deterioration of quality during the manufacturing process of the TFT substrate have arisen by the residue resulting from the surface protection film, and improvement of the residue cleaning and removal in a cleaning process is calculated | required.

Among these, Patent Literature 1 has a surface of a base material layer made of polyethylene containing 50% by weight or more of low density polyethylene having a density of 0.91 to 0.93 g / cm ³ , and a pressure-sensitive adhesive layer having a centerline average roughness Ra of 0.05 μm or less. A protective film is proposed.

However, the surface protection film of patent document 1 has the problem that peeling after adhesion of glass is difficult, workability is bad, and the residue which adhered (transferred) to glass is hard to fall off by washing | cleaning.

Patent Literature 2 discloses a two-layer film in which a pressure-sensitive adhesive layer made of an ethylene-vinyl acetate copolymer is formed on one side of a base layer made of a thermoplastic resin, and in Patent Literature 3, one side of the base layer is butyl. An adhesive tape for surface protection comprising an adhesive layer crosslinked with an aromatic isocyanate as an acrylic adhesive and a crosslinking agent comprising a copolymer of acrylate and acrylic acid is disclosed.

However, the same problem also concerns about the said two-layer film and the adhesive tape.

Japanese Patent No. 3103190 Japanese Patent No. 2980434 Japanese Patent Laid-Open No. 7-143643

Therefore, in order to solve the said problem in the conventional surface protection film (sheet), it is easy to attach a surface protection film to a glass surface, and after that, after peeling a surface protection film, a surface protection film ( It is providing the adhesive composition which can wash | clean and remove the residue resulting from the adhesive layer in the inside easily, an adhesive layer, and the mother glass surface protection film for flat panel displays using these.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, the present inventors discovered the adhesive composition shown below, an adhesive layer, and the mother glass surface protection film for flat panel displays using these, and came to complete this invention.

That is, the adhesive composition of this invention is characterized by containing 0.01-2 weight part of alkylene oxide group containing compounds with respect to 100 weight part of thermoplastic resins. By adding an alkylene oxide group containing compound together with a thermoplastic resin, when using this as an adhesive layer of a surface protection film, although detail is not clear, adhesion to a glass surface becomes easy and it originates in a surface protection film (middle adhesive layer). Reduction of a residue can be aimed at by replacing the residue, for example, the low molecular compound and the alkylene oxide group containing compound which are group which is an adhesive layer. Furthermore, also in the washing | cleaning process after surface protection film peeling, a residue can be wash | cleaned and removed easily, and it is useful.

Moreover, in the adhesive composition of this invention, it is preferable that the said alkylene oxide group containing compound is surfactant. By adding surfactant, when using this as an adhesive layer of a surface protection film, although the detail is not clear, adhesion to a glass surface becomes easy and it becomes a residue, such as an adhesive layer group, resulting from a surface protection film (middle adhesive layer). The low molecular weight compound and surfactant are substituted, and the residue can be reduced. Furthermore, also in the washing | cleaning process after surface protection film peeling, a residue can be wash | cleaned and removed easily by addition of surfactant, and it is useful.

It is preferable that the surface protection film of this invention consists of using the said adhesive composition. The surface protection film obtained using an adhesive composition is easy to process into a film form, a sheet form, a tape form, etc., and is useful.

It is preferable that the mother glass surface protection film for flat panel displays of this invention consists of a single layer formed using the said adhesive composition. Since the single layer itself formed using an adhesive composition functions as a mother glass surface protection film for flat panel displays, there is little manufacturing process and it is excellent in workability.

It is preferable that the mother glass surface protection film for flat panel displays of this invention forms the said adhesive composition on one side or both surfaces of a base material. By using the mother glass surface protection film for flat panel displays formed using the adhesive composition on the base material, it is useful because the surface of a to-be-adhered body (glass) can be protected from contamination, and generation | occurrence | production of a flaw etc. can be prevented.

In addition, in this invention, "mother glass for a flat panel display" means the glass plate of the state which can be put into the distribution before processing into various products, and refers to what is used for manufacture of a flat panel display. As a flat panel display, display apparatuses, such as a liquid crystal display, a plasma display panel, an organic electroluminescent display, are illustrated.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail.

The pressure-sensitive adhesive composition of the present invention is characterized by containing 0.01 to 2 parts by weight of an alkylene oxide group-containing compound based on 100 parts by weight of a thermoplastic resin.

Thermoplastic resin is used as a base polymer of the adhesive composition used for this invention.

As said thermoplastic resin, if it is a thermoplastic resin which exhibits adhesiveness, it can use suitably, For example, polyethylene type resin, a polypropylene resin, the block system of propylene-ethylene, a random type, a graft type polymer, a polystyrene resin, acrylic resin, etc. Known thermoplastic adhesive resins are mentioned. These can be used individually or in mixture of 2 or more types.

Examples of the polyethylene resin include low density polyethylene, linear low density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene propylene copolymer, ethylene 1-butene copolymer and ethylene 1-hexene copolymer, ethylene 4-methyl-1- pentene copolymer, ethylene 1-octene copolymer, ethylene methyl acrylate copolymer, ethylene methyl methacrylate copolymer, ethylene vinyl acetate copolymer, ethylene Polyolefin resin, such as an ethyl acrylate copolymer and ethylene vinyl alcohol copolymer, etc. are mentioned.

Examples of the polystyrene resins include styrene butadiene (SB), styrene isoprene (SI), styrene ethylene-butylene copolymer (SEB), and styrene ethylene-propylene copolymer (SEP). AB type diblock polymer, styrene butadiene styrene (SBS), styrene isoprene styrene (SIS), styrene ethylene-butylene copolymer styrene (SEBS), styrene Styrene-based random copolymers, such as multiblock polymers of ABA type triblock or ABAB type tetrablock or more such as ethylene-propylene copolymer styrene (SEPS), styrene butadiene rubber (SBR), styrene ABC type styrene olefin crystalline block polymers, such as an ethylene-butylene copolymer and an olefin crystal (SEBC), etc. are mentioned.

When using the above polyethylene-based resin as the thermoplastic resin, more preferably a low density polyethylene-based resin density of 0.880 ~ 0.950g / cm ³ is ^{preferably, 0.880 ~ 0.923g / cm 3,} 0.880 ~ O.915g / cm It is more preferable that it is ^three . The low density polyethylene resin is excellent in flexibility and practical. In addition, the density (g / cm <^3> ) in this invention means the value measured based on ISO 1183.

0.01-2 weight part of alkylene oxide group containing compounds are contained in the adhesive composition of this invention with respect to 100 weight part of said thermoplastic resins, Preferably it is 0.05-1.5 weight part, More preferably, it is 0.1-1 weight part. If it is less than 0.01 weight part, the residue removal performance in a washing process will fall, and if it exceeds 2 weight part, molding defect may be caused at the time of surface protection film manufacture (when extrusion-molded). As a cause, it can be considered that when a low viscosity alkylene oxide group-containing compound is mixed in a large amount, the fluidity with the thermoplastic resin becomes nonuniform, resulting in poor molding. Moreover, even if the film is molded, it is necessary to use more washing liquid when removing the residue with the washing liquid used in the washing process, which is not preferable in terms of cost.

As said alkylene oxide group containing compound, ethylene glycol, propylene glycol, butylene glycol, salicylic acid glycol, propylene glycol monofatty acid ester, polyoxyethylene polyoxypropylene glycol, polyoxyalkylene decyl ether, polyoxyethylene styryl phenyl Ether, polyoxyethylene alkyl ether, polyoxyethylene lauryl ether, polyoxyethylene lanolin alcohol ether, polyoxyethylene alkylamine ether, polyoxyethylene (2) lauric acid monoethanol amide, polyoxyethylene (5) palm oil fatty acid Compounds such as monoethanol amide, polyoxyethylene lauryl sulfate, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyoxyethylene castor oil, polyoxyethylene high hardened castor oil, polyoxyethylene lanolin fatty acid ester can be used. have. In addition, the compound is used as an emulsifier, a dispersant, a lubricant, a suspending agent, an anticorrosive agent, a surfactant, an antistatic agent, and the like, and particularly preferably a surfactant.

Although it will not specifically limit, if it is an alkylene oxide group containing compound as said surfactant, Specifically, as said ether type compound, polyoxyethylene polyoxypropylene glycol, polyoxyalkylene decyl ether, polyoxyethylene styryl phenyl ether, Preference is given to polyoxyethylene alkyl ethers, polyoxyethylene lauryl ethers, polyoxyethylene lanolin alcohol ethers, polyoxyethylene alkylamine ethers. Moreover, as said amide type compound, polyoxyethylene (2) lauric acid monoethanol amide, polyoxyethylene (5) palm oil fatty acid monoethanol amide, polyoxyethylene lauryl sulfate, etc. are preferable. Moreover, as said ester type compound, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyoxyethylene castor oil, polyoxyethylene high hardening castor oil, polyoxyethylene lanolin fatty acid ester, etc. are preferable.

Furthermore, in the adhesive layer used for the surface protection film of this invention, the olefin resin, silicone type polymer, liquid acrylic air which can be used for various conventional softeners, tackifiers, a base material layer for the purpose of control of adhesive characteristics, etc. Copolymer, Phosphate Ester Compound, Antioxidant, Hindered Amine Light Stabilizer, Ultraviolet Absorber, Surface Lubricant, Leveling Agent, Plasticizer, Low Molecular Polymer, Antioxidant, Preservative, Polymerization Inhibitor, Silane Coupling Agent, Inorganic and Organic Filler (For example, calcium oxide, magnesium oxide, silica, zinc oxide, titanium oxide, and the like), metal powders, powders such as colorants, pigments, and the like, and various conventionally known additives such as particulates, foils, and heat stabilizers. It can add suitably.

Moreover, an adhesive layer can be manufactured by melt-heating the said adhesive composition. The adhesive layer obtained by melt-heating an adhesive composition is easy to process into a film form, a sheet form, a tape form, etc., and is useful.

As a formation method of the said adhesive layer, although a well-known method can be used without a restriction | limiting in particular, For example, melt extrusion molding, a calender method, etc. are mentioned.

On the other hand, the surface of the pressure-sensitive adhesive layer may be subjected to surface treatment for the purpose of adhesive control, adhesion workability, and the like, such as corona discharge treatment, ultraviolet irradiation treatment, flame treatment, plasma treatment, sputter etching treatment, or the like, as necessary. .

Furthermore, a separator etc. can also be temporarily attached and protected to an adhesive layer as needed until it is provided for practical use.

In the surface protection film of this invention, the thickness of an adhesive layer is about 1-50 micrometers normally, Preferably it is 2-40 micrometers, More preferably, it is 3-20 micrometers. If the thickness is less than 1 µm, it becomes difficult to exhibit adhesiveness, and if it exceeds 50 µm, it becomes difficult to peel off, or the amount of the alkylene oxide group-containing compound added to the pressure-sensitive adhesive layer becomes unfavorable in terms of cost. not.

By using the single layer of the said adhesive layer, a surface protection film, especially the mother glass surface protection film for flat panel displays can be manufactured. Since the adhesive layer itself functions as a surface protection film, there are few manufacturing processes and it is useful.

In addition, the pressure-sensitive adhesive layer can be formed on one side or both sides of the substrate to form a mother glass surface protective film for a flat panel display. By using the surface protection film which provided the adhesive layer on the base material, it is useful because the surface of a to-be-adhered body (glass) can be protected from contamination and the occurrence of a flaw etc. can be prevented.

The base material (layer) used in the present invention is not particularly limited as long as it can be formed into a sheet shape, a film shape, a tape shape, or the like, but a polyolefin resin, for example, is preferable because it has heat resistance and solvent resistance and flexibility. . When a base material layer has flexibility, it can also be wound up in roll shape, and various processes can be performed suitably.

As said polyolefin resin, a propylene resin, an ethylene vinyl acetate copolymer, etc. which consist of polyethylene-type resin, a propylene or a propylene component, and an ethylene component are mentioned, for example.

Specifically, for example, low density polyethylene, linear low density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene propylene copolymer, ethylene-1-butene copolymer, ethylene-1- Hexene copolymer, ethylene 4-methyl-1-pentene copolymer, ethylene 1-octene copolymer, ethylene methyl acrylate copolymer, ethylene methyl methacrylate copolymer, ethylene vinyl acetate copolymer, ethylene ethyl Polyolefin resin, such as an acrylate copolymer and ethylene vinyl alcohol copolymer, etc. are mentioned.

In this invention, the said base material layer may contain suitably the well-known various additives generally used for base materials, such as this kind of film, a sheet, and a tape. For example, various fillers, pigments, ultraviolet absorbers, antioxidants, heat stabilizers, lubricants and the like can be mentioned.

About 20-300 micrometers is preferable normally as for the thickness of the said base material layer, More preferably, it is about 20-250 micrometers, More preferably, it is about 25-200 micrometers. If the substrate layer is less than 20 µm, the substrate may be broken or torn at the time of peeling. If the substrate layer is more than 300 µm, the elasticity of the substrate is increased, and the substrate is easily lifted after adhesion.

The substrate layer side of the surface protective film may be embossed or uneven to provide insulation or slip resistance.

As a manufacturing method of the surface protection film in this invention, the raw material which comprises the base material layer which consists of polyolefin resin, and the pressure-sensitive adhesive layer which consists of thermoplastic resins is melt-heated, respectively, and coextrusion molding is carried out to one side or both sides of a base material layer. The method of integrally forming an adhesive layer and manufacturing the film of the 2-layered structure (or multilayer of 3 or more layers) which has a predetermined thickness is preferable at the point which can manufacture the surface protection film of this invention at low cost with high efficiency.

As said coextrusion, the method generally used for manufacture of a film, a sheet, etc. can be employ | adopted, It does not specifically limit. For example, the inflation method, the coextrusion T-die method, etc. can be used. It is preferable in terms of cost and productivity to use these coextrusion molding.

In addition, the number of layers laminated | stacked in each said layer is not specifically limited, A single layer may be sufficient as the said base material layer and the said adhesive layer, respectively, and a laminated structure of multiple layers may be sufficient as needed.

Moreover, 20-150 micrometers is preferable and, as for the total thickness of the surface protection film of this invention, it is more preferable that it is about 30-100 micrometers. If the total thickness is less than 20 µm, the workability at the time of peeling is poor, and problems such as cracking are likely to occur. If the thickness is more than 150 µm, the problem of lifting after adhesion or disadvantageous in terms of cost is unfavorable.

Example

EMBODIMENT OF THE INVENTION Hereinafter, although the Example etc. which show a structure and effect of this invention concretely are demonstrated, this invention is not limited to these. In addition, the evaluation item in the Example etc. was measured as follows.

1) Peeling force

After attaching a surface protection film to the mother glass for liquid crystal substrates (made by NH Technoglass, NA35), it crimped | bonded (0.2 MPa, 1.0 m / min), and stored at 23 degreeC for 1 day, and tensile tester (made by Minebea company, TCM) Peeling force (N / 20mm) at the time of peeling a surface protection film at -5KNB-3, a tensile velocity of 0.3 m / min, an angle of 180 degrees was measured. On the other hand, 0.02N / 20mm or less is preferable and, as for peeling force, 0.015N / 20mm or less is more preferable. Moreover, as peeling force, 0.001 N / 20 mm or more is preferable from a viewpoint of adhesiveness and the measurement limit value in a tester. When peeling force is high, peeling workability deteriorates and the residue which originates in a surface protection film tends to increase.

2) contact angle

After attaching a surface protection film to glass (NH technoglass, NA35), it crimped | bonded (0.2 MPa, 1.0 m / min), after 40 degreeC * 4 days passed, the contact angle before washing is measured, and the said glass after that The surface was ultrasonically cleaned for 2 minutes using an inorganic alkali detergent (Yokohama Oil Holding Co., KG) 2.0% aqueous solution, and further rinsed with distilled water for 3 minutes, and the contact angle after washing was measured.

3) Cleaning effect (cleaning rate)

The washing effect (cleaning rate) was calculated by the following equation. On the other hand, the cleaning effect is preferably 65% or more, more preferably 70% or more. When the washing | cleaning effect is less than 65%, since it becomes a cause of the peeling defect by a residue, it is unpreferable.

Cleaning effect (cleaning rate) (%) = 100 × [(contact angle before cleaning-contact angle after cleaning) / (contact angle before cleaning)]

4) molding condition

In each Example (except Example 10) and the comparative example, it shape | molded by the inflation method. In addition, melting | fusing temperature set all the base material layer, an adhesive layer, die temperature, and coextrusion temperature to 180 degreeC. In addition, in Example 10, it shape | molded by the T die method. Melting temperature was set to 190 degreeC for both the extruder temperature and the die temperature.

EXAMPLE 1

Polyoxyethylene poly with respect to the base material layer (thickness: 26 micrometers) which consists of low density polyethylene (LDPE) (made by Tosoh Corporation, 183 micrometers), and 100 weight part of linear low density polyethylene (LLDPE) (made by Sumitomo Chemical, Sumikasen EFV402) Using a pressure-sensitive adhesive layer (4 μm thick) containing 0.06 parts by weight of oxypropylene glycol (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), a surface protective film (30 μm thick) having a two-layer structure by inflation using the molding conditions described above. Got.

EXAMPLE 2

A surface protective film (thickness 30 μm) was obtained in the same manner as in Example 1 except that the amount of polyoxyethylene polyoxypropylene glycol added was 0.36 parts by weight.

EXAMPLE 3

A surface protective film (thickness 30 μm) was obtained in the same manner as in Example 1 except that the amount of polyoxyethylene polyoxypropylene glycol added was 0.6 part by weight.

EXAMPLE 4

A surface protective film (thickness: 30 µm) was obtained in the same manner as in Example 1 except that the amount of polyoxyethylene polyoxypropylene glycol added was 0.9 parts by weight.

[Example 5]

Polyoxyethylene (2) lauric based on a base material layer (thickness: 26 µm) made of low density polyethylene (LDPE) (manufactured by Tosoh Corporation, Petrocene 183) and 100 parts by weight of linear low density polyethylene (prime polymer, Evo SP1540) Using a pressure-sensitive adhesive layer (thickness 4 μm) containing 0.06 parts by weight of acid monoethanol amide (manufactured by Kawaken Fine Chemicals, Amizette 2L-Y), a surface protective film having a two-layer structure by the inflation method using the above molding conditions ( Thickness of 30 μm).

EXAMPLE 6

Example 5 except that 0.18 parts by weight of polyoxyalkylene decyl ether (Daiichi Pharmaceutical Co., Ltd., Neugen XL-400) was added instead of the polyoxyethylene (2) lauric acid monoethanol amide of Example 5. In the same manner, a surface protective film (thickness 30 μm) was obtained.

EXAMPLE 7

Base material layer (thickness: 26 micrometers) which consists of low density polyethylene (LDPE) (made by Tosoh Corporation, Petrosene 183), and 50 weight part of linear low-density polyethylene (primer polymer, Evo SP1540) and linear low-density polyethylene (LLDPE) (Sumitomo A pressure-sensitive adhesive layer (thickness: 4 µm) containing 0.06 parts by weight of polyoxyethylene styryl phenyl ether (Daiichi Pharmaceutical Co., Ltd., Neugen EA-177) based on 100 parts by weight of a total of 50 parts by weight of a chemical agent and Sumikasen EFV402) The surface protection film (thickness 30 micrometers) of a two-layered structure was obtained by the inflation method using the said molding conditions using this.

[Example 8]

A surface protective film (thickness 30 μm) was obtained in the same manner as in Example 7 except that the amount of the polyoxyethylene styryl phenyl ether added was 0.18 parts by weight.

EXAMPLE 9

A surface protective film (thickness 30 μm) was obtained in the same manner as in Example 7 except that the amount of the polyoxyethylene styryl phenyl ether added was 0.36 parts by weight.

EXAMPLE 10

Single layer of pressure-sensitive adhesive layer containing 1.2 parts by weight of polyoxyethylene polyoxypropylene glycol (Daiichi Pharmaceutical Co., Epan 485) based on 100 parts by weight of ethylene vinyl alcohol copolymer (EVA) (manufactured by JPE, Novatech LV440) Using the T-die method, the surface protection film (35 micrometers in thickness) of a single structure was obtained.

EXAMPLE 11

100 weight of base material layer (26 micrometers in thickness) consisting of ethylene vinyl alcohol copolymer (EVA) (made by JPE, Novatech LV440) and styrene- ethylene butylene- ethylene block copolymer (SEBC) (made by JSR, DYNARON4600P) By using the pressure-sensitive adhesive layer (thickness 4㎛) containing 1.8 parts by weight of polyoxyethylene polyoxypropylene glycol (Daiichi Pharmaceutical Co., Ltd., Epan 485) to the part, the two-layer structure was formed by the inflation method using the above molding conditions. A surface protection film (thickness 30 micrometers) was obtained.

[Comparative Example 1]

Pressure-sensitive adhesive layer (thickness: 4 µm) composed of a base material layer (thickness: 26 µm) made of low density polyethylene (LDPE) (manufactured by Tosoh Corporation, Petrocene 183) and linear low density polyethylene (LLDPE) (manufactured by Sumitomo Chemical, Sumikasen EFV402) The surface protection film (thickness 30 micrometers) of a two-layered structure was obtained by the inflation method using the said molding conditions using this.

[Comparative Example 2]

Pressure-sensitive adhesive layer (4 µm thick) composed of a base material layer (thickness: 26 µm) made of low density polyethylene (LDPE) (manufactured by Tosoh Corporation, Petrocene 183) and ethylene vinyl alcohol copolymer (EVA) (manufactured by JPE, Novatech LV440). The surface protection film (thickness 30 micrometers) of a two-layered structure was obtained by the inflation method using the said molding conditions using this.

(Comparative Example 3)

94 parts by weight of butylene acrylate, 6 parts by weight of acrylic acid, and isocyanate-based crosslinking agent (Nippon Poly) on one side of the base material layer (thickness: 26 μm) made of low density polyethylene (LDPE) (manufactured by Tosoh Corporation, Petrocene 183) The surface protection film (30 micrometers in thickness) of 2-layered structure was obtained by apply | coating the adhesive solution which superposes | polymerizes urethane and 30 weight part of coronates L, and forms an adhesive layer (4 micrometers in thickness).

(Comparative Example 4)

50 parts by weight of linear low-density polyethylene (LLDPE) (prime polymer, Evory SP1540) and a straight chain on one side of the base material layer (thickness: 26 µm) made of low density polyethylene (LDPE) (manufactured by Tosoh Corporation, Petrocene 183) Pressure-sensitive adhesive layer (thickness: 4) containing 2.5 parts by weight of polyoxyethylene styryl phenyl ether (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., Neugen EA-177) with respect to 50 parts by weight of low density polyethylene (LLDPE) (manufactured by Sumitomo Chemical, Sumikasen EFV402) (Micrometer), and the surface protection film (thickness 30micrometer) of the two-layered structure was obtained by the inflation method using the said molding conditions. However, regarding this surface protection film, film forming defects generate | occur | produced and the dispersion | variation in thickness was also large and a characteristic evaluation could not be performed. As a cause of film forming defect, since the content of the said polyoxyethylene styryl phenyl ether is excessive, it can be considered that fluidity with a thermoplastic resin becomes nonuniform.

According to the said method, the measurement and evaluation of the produced surface protection film were performed. The obtained results are shown in Table 1.

A) polyoxyethylene polyoxypropylene glycol in Table 1, B: polyoxyethylene (2) lauric acid monoethanol amide, C: polyoxyalkylene decyl ether, D: polyoxyethylene styryl phenyl ether .

From the result of Table 1, in the Example using the surface protection film produced by this invention, it confirmed that peeling force was suppressed in any case and peeling workability was favorable and the cleaning effect (cleaning rate) was also very high. Could.

On the other hand, in the comparative example which did not use the alkylene oxide group containing compound, it was confirmed that peeling power was high and it was inferior to peeling workability, and it was inferior to the washing effect.

As mentioned above, after confirming that the surface protection film of this invention adheres a surface protection film to a glass surface, peeling of a surface protection film is easy and after that, the residue resulting from a surface protection film can be easily wash | cleaned and removed. It became.

Claims (5)

A pressure-sensitive adhesive composition comprising 0.01 to 2 parts by weight of an alkylene oxide group-containing compound based on 100 parts by weight of a thermoplastic resin. The method of claim 1,
The pressure-sensitive adhesive composition, wherein the alkylene oxide group-containing compound is a surfactant. It uses the adhesive composition of Claim 1 or 2, The surface protection film characterized by the above-mentioned. The mother glass surface protective film for flat panel displays which consists of a single layer formed using the adhesive composition of Claim 1 or 2. The adhesive glass composition of Claim 1 or 2 is formed on one side or both sides of a base material, The mother glass surface protection film for flat panel displays characterized by the above-mentioned.