KR102032150B1 - Method for producing antistatic surface-protective film, and antistatic surface-protective film - Google Patents

Abstract

The present invention provides an antistatic surface protective film that is less contaminated to the adherend, does not deteriorate with time, and has excellent antistatic peeling performance. (Meth) acrylic acid ester monomer whose C1-C4 carbon number of (a2) alkyl group has 1-30 weight part of (meth) acrylic acid ester monomers of C1-C4 of an alkyl group on one side of the base film (1) To (C) a bifunctional or higher isocyanate compound, and (D) crosslinking, consisting of an acrylic polymer of a copolymer obtained by copolymerizing a copolymerizable monomer containing 70 to 99 parts by weight and a (B) hydroxyl group with 0.1 to 12 parts by weight. The adhesive layer 2 which consists of an adhesive composition containing an accelerator and (E) ketoenol tautomer compound is formed, the release film 5 in which the release agent layer 4 was laminated | stacked on the surface is bonded, and a release agent layer The antistatic agent of (4) is transferred to the surface of the adhesive layer 2.

Description

TECHNICAL FOR PRODUCING ANTISTATIC SURFACE-PROTECTIVE FILM, AND ANTISTATIC SURFACE-PROTECTIVE FILM

The present invention relates to an antistatic surface protective film. More specifically, the present invention relates to a method for producing an antistatic surface protection film having an antistatic performance and to an antistatic surface protection film, wherein the antistatic property is less contaminated to the adherend and does not deteriorate with time and has excellent peeling antistatic performance. Provided are a method for producing an antistatic surface protection film and an antistatic surface protection film.

Surface of the said optical film, when manufacturing and conveying optical films, such as a polarizing plate, retardation plate, the lens film for displays, an antireflection film, a hard-coat film, a transparent conductive film for touch panels, and a display using the same. The surface protection film is bonded together to the surface to prevent contamination and scratches on the surface in a later step. The external appearance inspection of the optical film which is an optical product may be performed in the state which bonded the surface protection film to the optical film in order to reduce the effort of peeling and bonding again a surface protection film and to raise work efficiency.

Conventionally, the surface protection film which provided the adhesive layer in one side of the base film is generally used in the manufacturing process of an optical product, in order to prevent a damage | wound and adhesion of a dirt. The surface protective film is bonded to the optical film via the adhesive layer of micro adhesion. The non-adhesive force of the pressure-sensitive adhesive layer can be easily peeled off when the used surface protection film is peeled off and removed from the surface of the optical film so that the pressure-sensitive adhesive does not remain attached to the optical film of the product which is the adherend. (So as to prevent the occurrence of adhesive residues).

In recent years, in the production process of a liquid crystal display panel, circuit components, such as a driver IC, for controlling the display screen of a liquid crystal display panel by the peeling charge voltage which arises when peeling and removing the surface protection film bonded on the optical film. The occurrence of this breakdown and the phenomenon that the orientation of the liquid crystal molecules are impaired are small but occur.

In addition, in order to reduce the power consumption of the liquid crystal display panel, the driving voltage of the liquid crystal material is lowered, and with this, the breakdown voltage of the driver IC is also lowered. Recently, it is required to bring the peeling electrification voltage into the range of +0.7 kV to -0.7 kV.

For this reason, in order to prevent the problem by which peeling electrification voltage is high, when peeling a surface protection film from the optical film which is a to-be-adhered body, the surface protection film using the adhesive layer containing the antistatic agent for suppressing peeling electrification voltage low is It is proposed.

For example, Patent Literature 1 discloses a surface protective film using an adhesive made of an alkyltrimethylammonium salt, a hydroxyl group-containing acrylic polymer, and a polyisocyanate.

In addition, Patent Literature 2 discloses an adhesive composition composed of an ionic liquid and an acrylic polymer having an acid value of 1.0 or less, and adhesive sheets using the same.

In addition, Patent Document 3 discloses an adhesive composition composed of an alkali metal salt treated with an acrylic polymer, a polyether polyol compound, an anion adsorbent compound, and a surface protective film using the same.

In addition, Patent Document 4 discloses an adhesive composition composed of an ionic liquid, an alkali metal salt, a polymer having a glass transition temperature of 0 ° C. or less, and a surface protective film using the same.

Moreover, it is disclosed by patent documents 5 and 6 to mix polyether modified silicone in the adhesive layer of a surface protection film.

Japanese Laid-Open Patent Publication 2005-131957 Japanese Laid-Open Patent Publication 2005-330464 Japanese Laid-Open Patent Publication 2005-314476 Japanese Laid-Open Patent Publication No. 2006-152235 Japanese Unexamined Patent Publication No. 2009-275128 Japanese Patent Publication No. 4537450

In Patent Documents 1 to 4, an antistatic agent is added to the inside of the pressure-sensitive adhesive layer, but as the thickness of the pressure-sensitive adhesive layer becomes thicker, and as the elapsed time passes, the pressure-sensitive adhesive layer with respect to the adherend to which the surface protective film is bonded The amount of antistatic agent to be transferred to the adherend increases. Moreover, in the optical films, such as a LR (Low Reflective) polarizing plate and AG (Anti Glare) -LR polarizing plate, since the surface of an optical film is antifouling with a silicon compound, a fluorine compound, etc., the surface used for such an optical film The peeling electrification voltage at the time of peeling a protective film from the optical film which is a to-be-adhered body becomes high.

Moreover, when polyether modified silicone is mixed in the adhesive layers of patent documents 5 and 6, it is difficult to fine-tune the adhesive force of a surface protection film. Moreover, since polyether modified silicone is mixed in an adhesive layer, when the conditions which apply and dry an adhesive composition on a base film change, the surface characteristic of the adhesive layer in which the surface protection film was formed changes slightly. In addition, from the viewpoint of protecting the surface of the optical film, the thickness of the pressure-sensitive adhesive layer cannot be made extremely thin. For this reason, it is necessary to increase the addition amount of the polyether modified silicone mixed in an adhesive layer according to the thickness of an adhesive layer, and as a result, it becomes easy to contaminate the surface of a to-be-adhered body, and the adhesive force and contamination with respect to a to-be-adhered body change with time do.

In recent years, with the spread of a 3D display (stereoscopic display), the FPR (Film Patterned Retarder) film was bonded together on the surface of optical films, such as a polarizing plate. An FPR film is bonded together after peeling off the surface protection film bonded to the surface of optical films, such as a polarizing plate. However, when the surface of optical films, such as a polarizing plate, is contaminated with the adhesive or antistatic agent used for a surface protection film, there exists a problem that a FPR film is hard to adhere | attach. For this reason, it is calculated | required that the surface protection film used for the said use is low in contamination with a to-be-adhered body.

On the other hand, in several liquid crystal panel makers, the surface protection film bonded to optical films, such as a polarizing plate, was peeled once and rebonded in the state which mixed bubbles as a method of evaluation of the contamination property to the adherend of a surface protection film. The method of heat-processing on predetermined conditions, then peeling a surface protection film and observing the surface of a to-be-adhered body is employ | adopted. In such an evaluation method, even if the surface contamination of the adherend is very small, if there is a difference between the surface contamination of the adherend in the portion where the bubble is mixed and the portion where the pressure-sensitive adhesive of the surface protective film is in contact with the surface, the trace of the bubble may be referred to as bubble stain. Remains as). For this reason, it becomes a very strict evaluation method as an evaluation method of the contamination property to the surface of a to-be-adhered body. In recent years, even if it is the determination result by such a strict evaluation method, the surface protection film which does not have a problem with the contamination on the surface of a to-be-adhered body is calculated | required. However, the surface protection film using the adhesive layer containing the antistatic agent conventionally proposed was a situation where it was difficult to solve the said subject.

For this reason, as a surface protection film used for an optical film, it is necessary that the contamination with respect to a to-be-adhered body is very small, and that the contamination with respect to a to-be-adhered body does not change with time. Moreover, the surface protection film which suppressed the peeling electrification voltage at the time of peeling from a to-be-adhered body is calculated | required.

The present inventors earnestly examined in order to solve this subject.

In order to reduce the contamination on the adherend and to reduce the changes over time in the antistatic performance, it is necessary to reduce the amount of the antistatic agent that is supposed to be contaminating the adherend. However, when the addition amount of an antistatic agent is reduced, the peeling electrification voltage at the time of peeling a surface protection film from a to-be-adhered body becomes high. The present inventors did not increase the absolute amount of the addition amount of an antistatic agent, but examined about the method of suppressing peeling electrification voltage when peeling a surface protection film from a to-be-adhered body. As a result, rather than adding and mixing an antistatic agent in an adhesive composition to form an adhesive layer, after apply | coating and drying an adhesive composition and laminating | stacking an adhesive layer, the surface protection is provided by providing a suitable amount of antistatic agent component to the surface of an adhesive layer. It discovered that the peeling electrification voltage at the time of peeling a film in the optical film which is a to-be-adhered body can be suppressed low, and completed this invention.

This invention is made | formed in view of the said situation, and it is a subject to provide the manufacturing method of an antistatic surface protection film which has little contamination with a to-be-adhered body, and does not deteriorate with time, and has excellent peeling antistatic performance, and an antistatic surface protection film. Shall be.

In order to solve the said subject, the antistatic surface protection film of this invention coats and dries an adhesive composition, and after laminating | stacking an adhesive layer, by providing an appropriate amount of antistatic agent to the surface of the adhesive layer, it is contaminated to a to-be-adhered body. It is a technical idea to suppress low the peeling electrification voltage at the time of peeling from the optical film which is a to-be-adhered body, after suppressing low.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention is an adhesive composition containing the following process (1)-(3) and a process (1): acrylic-type polymer as a manufacturing method of an antistatic surface protection film, Comprising: (A) 1-100 of at least 1 sort (s) of the (meth) acrylic acid ester monomer which has C1-C4 carbon number of an alkyl group with respect to a total of 100 weight part of C1-C18 (meth) acrylic acid ester monomers. 70 parts by weight of at least one of the (meth) acrylic acid ester monomers having C5 to C18 carbon number of the alkyl group (a2) alkyl group, and at least one of the copolymerizable monomers containing (B) a hydroxyl group as a monomer group copolymerizable. It consists of the acryl-type polymer of the copolymer which copolymerized the species 0.1-12 weight part, and the said acryl-type polymer is a copolymerizable monomer containing a carboxyl group, and the nitrogen-containing vinyl monomer containing no hydroxyl group. The pressure-sensitive adhesive composition further comprises the step of producing a pressure-sensitive adhesive composition containing (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator, and (E) a ketoenol tautomer compound, and step (2 ): Forming a pressure-sensitive adhesive layer crosslinked with the pressure-sensitive adhesive composition on one surface of a base film made of a resin having transparency; step (3): containing an antistatic agent on one surface of the resin film on the surface of the pressure-sensitive adhesive layer The process by which the release film in which the release agent layer was laminated | stacked is bonded together through the said release agent layer, and the said antistatic agent of the said release agent layer is transferred to the surface of the said adhesive layer is manufactured through the procedure of process (1)-(3), And the release agent layer is formed of a resin composition containing a release agent and an antistatic agent mainly composed of dimethylpolysiloxane, and the pressure-sensitive adhesive layer has a low reflection surface. After bonding to the treated polarizing plate, the peeling electrification voltage at the time of peeling is ± 0.6 kPa or less, and after bonding the said adhesive layer to the polarizing plate to which the said low reflection surface treatment was performed, the contamination property at the time of peeling is favorable. Provided are a method for producing an antistatic surface protective film.

Moreover, the said adhesive composition contains the polyalkylene glycol mono (meth) acrylic acid ester monomer whose average repeat number of the alkylene oxide which comprises (F) polyalkylene glycol chain is 3-14, and the diester content in a monomer is 0.2% or less. It is desirable to.

Moreover, it is preferable that the antistatic agent in the said peeling agent layer is an alkali metal salt.

Moreover, in order to solve the said subject, this invention is an antistatic surface protection film in which the adhesive layer which crosslinked the adhesive composition containing an acrylic polymer is formed in one surface of the base film which consists of transparency resin, The said acrylic polymer (A) At least 1 sort (s) of the (meth) acrylic acid ester monomer which has C1-C4 carbon number of (a1) alkyl group with respect to a total of 100 weight part of (meth) acrylic acid ester monomers whose C1-C18 carbon number is an alkyl group. 70 to 99 parts by weight of at least one of the (meth) acrylic acid ester monomers having from 30 to 5 parts by weight of the C5 to C18 alkyl group of the alkyl group (a2), and a copolymerizable monomer group containing a hydroxyl group (B). It consists of an acryl-type polymer of the copolymer which copolymerized at least 1 sort (s) 0.1-12 weight part, and the said acryl-type polymer is a copolymerization value containing a carboxyl group. It does not contain one monomer and a nitrogen-containing vinyl monomer that does not contain a hydroxyl group, and the pressure-sensitive adhesive composition further contains (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator, and (E) a ketoenol tautomer compound. The release film which consists of and which laminated | stacked the peeling agent layer containing an antistatic agent on one surface of a resin film on the surface of the said adhesive layer is laminated | stacked through the said peeling agent layer, and the said antistatic agent of the said peeling agent layer is said Transferred to the surface of the pressure-sensitive adhesive layer, and the release agent layer is formed of a resin composition containing a releasing agent mainly composed of dimethylpolysiloxane, a liquid silicone compound and an antistatic agent at 20 ° C, and the pressure-sensitive adhesive layer After bonding to the polarizing plate subjected to the low reflection surface treatment, it is good that An antistatic surface protective film is provided.

Moreover, the average repeat of the alkylene oxide which comprises (F) polyalkylene glycol chain with respect to the said adhesive composition further with respect to a total of 100 weight part of the (meth) acrylic acid ester monomers whose C1-C18 carbon number of the (A) alkyl group is carried out. It is preferable that a number is 3-14 and 0-50 weight part (it may not contain) may be contained for the polyalkylene glycol mono (meth) acrylic acid ester monomer whose diester content in a monomer is 0.2% or less.

The crosslinking accelerator (D) is at least one or more selected from the group consisting of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound, and is 0.001 to 0.5 part by weight based on 100 parts by weight of the acrylic polymer, and (E) It is preferable to contain 0.1-300 weight part of ketoenol tautomer compounds, and it is preferable that the weight part ratio of (E) / (D) is 70-1000.

Moreover, the copolymerizable monomer containing the said (B) hydroxyl group is 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy At least one selected from the group consisting of hydroxyethyl (meth) acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, and N-hydroxyethyl (meth) acrylamide; It is preferable that it is 0.1-10 weight part with respect to 100 weight part of said acrylic polymers.

The difunctional isocyanate compound as the (C) bifunctional or higher isocyanate compound is a compound formed by reacting a diisocyanate compound with a diol compound as an acyclic aliphatic isocyanate compound. One kind selected from the group consisting of methylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate; and diol compounds include 2-methyl-1,3-propanediol, 2, 2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, 3-methyl-1,5-pentane Among the compound groups consisting of diols, 2,2-dimethyl-1,3-propanediol monohydroxy pivalate, polyethylene glycol and polypropylene glycol It consists of 1 type | mold which consists of 1 type, and as a trifunctional isocyanate compound, the isocyanurate body of the hexamethylene diisocyanate compound, the isocyanurate body of the isophorone diisocyanate compound, the adduct body of the hexamethylene diisocyanate compound, isophorone Adducts of diisocyanate compounds, biurets of hexamethylene diisocyanate compounds, biurets of isophorone diisocyanate compounds, isocyanurates of tolylene diisocyanate compounds, isocyanurates of xylylene diisocyanate compounds, hydrogenated Isocyanurate body of xylylene diisocyanate compound, adduct body of tolylene diisocyanate compound, adduct body of xylylene diisocyanate compound, adduct body of hydrogenated xylylene diisocyanate compound, 100 weight part of said acryl-type polymers On It is preferably 0.1 to 10 parts by weight.

Moreover, it is preferable to include 1.0 weight part or less (except the case of 0 weight part) with respect to 100 weight part of said acrylic polymers (H) polyether modified siloxane compound whose HLB value is 7-15 in the said adhesive composition.

Moreover, it is preferable that the silicone type compound in the said peeling agent layer is polyether modified silicone.

Moreover, it is preferable that the antistatic agent in the said peeling agent layer is an alkali metal salt.

Moreover, it is preferable that the antistatic agent in the said peeling agent layer is Li salt, and is at least 1 sort (s) or more selected from the compound group which consists of LiTFSI, LiFSI, and LiTF.

Moreover, this invention provides the optical film in which the said antistatic surface protection film is bonded together.

Moreover, this invention provides the optical component by which the said antistatic surface protection film is bonded together.

The antistatic surface protection film of this invention has little contamination with a to-be-adhered body, and low contamination property with respect to a to-be-adhered body does not change with time. Moreover, according to this invention, even if the surface of a to-be-adhered body, such as an LR polarizing plate and an AG-LR polarizing plate, is an optical film antifouling | treated with a silicon compound, a fluorine compound, etc., it arises when peeling an antistatic surface protection film from a to-be-adhered body. The peeling electrification voltage can be suppressed low, and it can provide the antistatic surface protection film which does not deteriorate with time and has the outstanding peeling antistatic performance.

According to the antistatic surface protection film of this invention, since the surface of the optical film can be reliably protected, the improvement of productivity and the yield can be aimed at.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the concept of the antistatic surface protection film of this invention.
It is sectional drawing which shows the state which peeled the peeling film from the antistatic surface protection film of this invention.
3 is a cross-sectional view showing one embodiment of an optical component of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the concept of the antistatic surface protection film of this invention. As for this antistatic surface protection film 10, the adhesive layer 2 is formed in the surface of one surface of the transparent base film 1. As shown in FIG. The release film 5 in which the release agent layer 4 was formed in the surface of the resin film 3 is bonded to the surface of this adhesive layer 2.

As the base film 1 used for the antistatic surface protection film 10 which concerns on this invention, the base film which consists of resin which has transparency and flexibility is used. Thereby, the external appearance inspection of an optical component can be performed in the state which bonded the antistatic surface protection film to the optical component which is a to-be-adhered body. As a film which consists of resin which has transparency used as the base film 1, Preferably polyester films, such as a polyethylene terephthalate, a polyethylene naphthalate, a polyethylene isophthalate, a polybutylene terephthalate, are used. In addition to the polyester film, a film made of other resin can be used as long as it has the required strength and has optical aptitude. The base film 1 may be a non-stretched film, or may be a film uniaxially or biaxially stretched. In addition, you may control the draw ratio of a stretched film, and the oriented angle of the axial direction formed with crystallization of a stretched film to a specific value.

Although the thickness of the base film 1 used for the antistatic surface protection film 10 which concerns on this invention is not specifically limited, For example, the thickness of about 12-100 micrometers is preferable, and the thickness of about 20-50 micrometers It is easy to handle if it is, and it is more preferable.

Moreover, the antifouling layer which prevents surface contamination, an antistatic layer, a scratch prevention hard coat layer, etc. can be formed in the surface on the opposite side to the surface in which the adhesive layer 2 of the base film 1 was formed as needed. In addition, you may perform the adhesion | attachment process, such as surface modification by corona discharge, application | coating of an anchor coat agent, on the surface of the base film 1.

Moreover, the adhesive layer 2 used for the antistatic surface protection film 10 which concerns on this invention adheres to the surface of a to-be-adhered body, and can easily peel off after use, and also the adhesive which is hard to contaminate a to-be-adhered body Although it will not specifically limit, If it considers durability, etc. after bonding to an optical film, it is common to use the acrylic adhesive which crosslinks the adhesive composition containing an acrylic polymer.

In particular, the acrylic polymer is a (meth) acrylic acid ester monomer having a C1 to C18 carbon number of the (A) alkyl group, and (a1) at least one kind of a (meth) acrylic acid ester monomer having a C1 to C4 carbon number of the alkyl group, (a2) Adhesive group which consists of an acrylic polymer of the copolymer which copolymerized at least 1 sort (s) of the copolymerizable monomer containing (B) hydroxyl group as a monomer group copolymerizable with at least 1 sort (s) of the (meth) acrylic acid ester monomer whose C1-C18 carbon number of an alkyl group. Layers are preferred.

As said copolymerizable monomer group, the polyalkylene glycol mono (meth) acrylic acid ester monomer whose average repeating number of the alkylene oxide which comprises (F) polyalkylene glycol chain further is 3-14, and the diester content in a monomer is 0.2% or less. It may include.

It is preferable that an acryl-type polymer does not contain the copolymerizable monomer containing a carboxyl group, and the nitrogen containing vinyl monomer which does not contain a hydroxyl group.

Furthermore, in addition to the said acryl-type polymer, the adhesive layer which consists of an adhesive composition containing (C) bifunctional or more isocyanate compound, (D) crosslinking promoter, and (E) ketoenol tautomer compound is preferable.

(A) Among the (meth) acrylic acid ester monomers of C1-C18 carbon number of an alkyl group, (a1) At least 1 sort (s) of the (meth) acrylic acid ester monomer whose C1-C4 carbon number of an alkyl group is butyl (meth) acrylate and iso Butyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and isopropyl (meth) acrylate.

Moreover, as a (meth) acrylic acid ester monomer whose C5-C18 carbon number of the (a2) alkyl group is pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, and iso Octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl ( Meta) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) Acrylate, octadecyl (meth) acrylate, myristyl (meth) acrylate, isomyristyl (meth) acrylate, cetyl (meth) acrylate, isocetyl (meth) acrylate, stearyl (meth) acrylate Isostea (Meth) acrylate.

(A) 1-100 of at least 1 sort (s) of the (meth) acrylic acid ester monomer which has C1-C4 carbon number of an alkyl group with respect to a total of 100 weight part of C1-C18 (meth) acrylic acid ester monomers. It is preferable that a weight part and (a2) contain at least 1 sort (s) of the (meth) acrylic acid ester monomer whose C1-C18 carbon number is C70-C18, and at least 1 sort (s) of said (a1) is 5-. It is more preferable to contain 25 weight part and at least 1 sort (s) of said (a2) in the ratio of 75-95 weight part, 8-22 weight part of at least 1 sort (s) of said (a1), and It is especially preferable to contain at least 1 type in the ratio of 78-92 weight part.

(B) As a copolymerizable monomer containing a hydroxyl group, 8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl Hydroxyalkyl (meth) acrylates, such as (meth) acrylate, N-hydroxy (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-hydroxyethyl (meth) acrylamide, etc. Hydroxyl group-containing (meth) acrylamides; and the like.

8-hydroxyoctyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, N-hydroxy (meth) It is preferable that it is at least 1 sort (s) or more chosen from the compound group which consists of acrylamide, N-hydroxymethyl (meth) acrylamide, and N-hydroxyethyl (meth) acrylamide. The copolymerizable monomer containing these (B) hydroxyl groups does not have a polyalkylene glycol chain unlike the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer mentioned later.

(A) To copolymerize at least 1 sort (s) of the copolymerizable monomer containing a hydroxyl group in the ratio of 0.1-12 weight part with respect to a total of 100 weight part of (meth) acrylic acid ester monomers whose C1-C18 carbon number is an alkyl group. It is preferable, It is more preferable that it is 0.1-9.5 weight part, It is especially preferable that it is 0.3-8 weight part.

Moreover, when making the sum total of the said acrylic polymer into 100 weight part, it is preferable to contain the copolymerizable monomer containing the said (B) hydroxyl group in the ratio of 0.1-10 weight part, It is more preferable that it is 0.1-8.5 weight part, It is especially preferable that it is 0.3-7.5 weight part.

As the (C) bifunctional or higher isocyanate compound, at least one or two or more selected from polyisocyanate compounds having at least two or more isocyanate (NCO) groups in one molecule may be used. Although there exist classifications, such as aliphatic isocyanate, aromatic isocyanate, acyclic isocyanate, alicyclic isocyanate, etc. in a polyisocyanate compound, Any may be sufficient as it. Specific examples of the polyisocyanate compound include aliphatic isocyanate compounds such as hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and trimethylhexamethylene diisocyanate (TMDI), diphenylmethane diisocyanate (MDI) and xyl. And aromatic isocyanate compounds such as reylene diisocyanate (XDI), hydrogenated xylylene diisocyanate (H6XDI), dimethyldiphenylene diisocyanate (TOID), and tolylene diisocyanate (TDI).

Examples of the trifunctional or higher isocyanate compound include trivalent or higher polyols (one molecule) such as a biuret modified product of a bifunctional isocyanate compound (a compound having two NCO groups in one molecule), an isocyanurate modified product, trimethylolpropane (TMP), and glycerin And adducts (polyol modified substances) with at least three or more OH groups).

As the (C) bifunctional or higher isocyanate compound, only (C-1) trifunctional isocyanate compound or only (C-2) difunctional isocyanate compound may be used. Moreover, it is also possible to use together the (C-1) trifunctional isocyanate compound and the (C-2) difunctional isocyanate compound.

Moreover, as (C-1) trifunctional isocyanate compound used for this invention, the isocyanurate body of the hexamethylene diisocyanate compound, the isocyanurate body of the isophorone diisocyanate compound, and the adduct of the hexamethylene diisocyanate compound At least one selected from the group of (C-1-1) first aliphatic isocyanate compounds comprising a sieve, an adduct of an isophorone diisocyanate compound, a burette body of a hexamethylene diisocyanate compound, and a burette body of an isophorone diisocyanate compound Isocyanurate of tolylene diisocyanate compound, isocyanurate of xylylene diisocyanate compound, isocyanurate of hydrogenated xylylene diisocyanate compound, adduct of tolylene diisocyanate compound, xylylene di Adduct, number of isocyanate compounds Xylyl preferably comprises a diisocyanate compound in the air duct formed body (C-1-2) a second aromatic diisocyanate, at least one or more kinds selected from the compound group. It is preferable to use together the (C-1-1) 1st aliphatic isocyanate compound group and (C-1-2) 2nd aromatic type isocyanate compound group. In the present invention, at least one or more selected from the (C-1-1) first aliphatic isocyanate compound group and the (C-1-2) second aromatic isocyanate compound group as the (C-1) trifunctional isocyanate compound By using together at least 1 sort (s) or more selected from, the adhesive force balance of a low speed peeling area | region and a high speed peeling area | region can further be improved.

In addition, the (C-1) trifunctional isocyanate compound is at least one or more selected from the above-mentioned (C-1-1) first aliphatic isocyanate compound group, and the (C-1-2) second aromatic isocyanate compound group. It is preferable that it contains at least 1 sort (s) or more selected from among 0.5-5 weight part in total with respect to 100 weight part of said acrylic polymers. Further, the mixing ratio of at least one selected from the group of (C-1-1) first aliphatic isocyanate compounds and at least one type selected from the group of (C-1-2) second aromatic isocyanate compounds is (C-1-1). It is preferable that 1-1) :( C-1-2) exists in the range of 10%: 90%-90%: 10% by weight ratio.

Furthermore, as a (C-2) difunctional isocyanate compound used for this invention, it is a non-cyclic aliphatic isocyanate compound, and it is preferable that it is a compound produced by making a diisocyanate compound and a diol compound react.

For example, a diisocyanate compound is represented by the general formula "O = C = NXN = C = O" (wherein X is divalent) and a diol compound is represented by the formula "HO-Y-OH" (where Y is divalent). When showing, as a compound produced by making a diisocyanate compound and a diol compound react, the compound represented by following formula (Z) is mentioned, for example.

[Formula Z]

O = C = NX- (NH-CO-OYO-CO-NH-X) _n -N = C = O

N is an integer of 0 or more. In the case where n is 0, the chemical formula Z represents "O = C = N-X-N = C = O". As the bifunctional acyclic aliphatic isocyanate compound, in the general formula Z, a compound in which n is 0 (unreacted diisocyanate compound relative to the diol compound) may be included, but it is preferable to include a compound in which n is an integer of 1 or more as an essential component. The bifunctional acyclic aliphatic isocyanate compound may be a mixture composed of a plurality of compounds in which n in the general formula Z is different.

The diisocyanate compound represented by general formula "O = C = N-X-N = C = O" is an aliphatic diisocyanate. X is acyclic and preferably an aliphatic divalent group. As said aliphatic diisocyanate, it is preferable that it consists of 1 type, or 2 or more types chosen from the compound group which consists of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, and lysine diisocyanate.

The diol compound represented by general formula "HO-Y-OH" is an aliphatic diol. Y is acyclic and preferably an aliphatic divalent group. The diol compound is 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-ethyl-2- Selected from the group consisting of butyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-propanediol monohydroxypivalate, polyethylene glycol and polypropylene glycol It is preferable to consist of 1 type, or 2 or more types.

It is preferable that the weight ratio (C-1 / C-2) of the said (C-1) trifunctional isocyanate compound and (C-2) difunctional isocyanate compound is 1-90. It is preferable that the said (C) bifunctional or more isocyanate compound is 0.1-10 weight part with respect to 100 weight part of said acrylic polymers.

(D) The crosslinking accelerator may be a substance which functions as a catalyst for the reaction (crosslinking reaction) of the acrylic polymer and the crosslinking agent when the polyisocyanate compound is used as a crosslinking agent, and may be an amine compound such as a tertiary amine or a metal chelate compound. And organometallic compounds such as organic tin compounds, organic lead compounds, and organic zinc compounds. In this invention, a metal chelate compound and an organic tin compound are preferable as a crosslinking promoter.

The metal chelate compound is a compound in which at least one polydentate ligand L is bonded to the central metal atom M. The metal chelate compound may or may not have one or more single-site ligands X bonded to the metal atom M. For example, when the chemical formula of a metal chelate compound having one metal atom M is represented by M (L) _m (X) _n , m ≧ 1 and _n ≧ 0. When m is two or more, m pieces of L may be the same ligand or may be different ligands. When n is two or more, n pieces of X may be the same ligand or different ligands.

Examples of the metal atom M include Fe, Ni, Mn, Cr, V, Ti, Ru, Zn, Al, Zr, Sn and the like.

As the polydentate ligand L, β-ketoesters such as methyl acetoacetate, ethyl acetoacetate, octyl acetoacetate, acetoacetic acid oleyl, acetoacetic acid lauryl, acetoacetate acetate, acetylacetone (nickname 2,4-pentanedione), (Beta) -diketone, such as 2, 4- hexanedione and benzoyl acetone, is mentioned. These are ketoenol tautomer compounds, and in the multidentate ligand L, the enolate in which the enol is deprotoned (for example, acetylacetonate) may be used.

As the single ligand, X, alkoxy groups such as halogen atoms such as chlorine atom and bromine atom, pentanoyl group, hexanoyl group, 2-ethylhexanoyl group, octanoyl group, nonanoyl group, decanoyl group, dodecanoyl group and octadecanoyl group And alkoxy groups such as methoxy group, ethoxy group, n-propoxy group, isopropoxy group, butoxy group and the like.

Specific examples of the metal chelate compound include tris (2,4-pentanedionate) iron (III), iron trisacetylacetonate, titanium trisacetylacetonate, ruthenium trisacetylacetonate, zinc bisacetylacetonate, aluminum tris Acetylacetonate, zirconium tetrakisacetylacetonate, tris (2,4-hexanedionate) iron (III), bis (2,4-hexanedionate) zinc, tris (2,4-hexanedionate) titanium, Tris (2, 4- hexane dionate) aluminum, tetrakis (2, 4- hexane dionate) zirconium, etc. are mentioned.

Examples of the organic tin compound include dialkyl tin oxide, fatty acid salts of dialkyl tin, fatty acid salts of first tin, and the like. Conventionally, many dibutyltin compounds have been used, but in recent years, the toxicity problem of organic tin compounds has been pointed out, and tributyltin (TBT) contained in the dibutyltin compound is particularly concerned as an endocrine disrupting substance. From the viewpoint of safety, long chain alkyl tin compounds such as dioctyl tin compounds are preferred. Dioctyl tin oxide, dioctyl tin dilaurate, etc. are mentioned as a specific organic tin compound. In the future, Sn compounds may also be used, but in the future, in view of the tendency to use more safe materials, it is preferable to use metal chelate compounds such as Al, Ti, and Fe that are more safe than Sn. desirable.

It is preferable that it is at least 1 sort (s) chosen from the group which consists of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound as (D) crosslinking promoter in the adhesive composition which concerns on this invention.

(D) It is preferable to contain 0.001-0.5 weight part with respect to 100 weight part of said acrylic polymers.

(E) As a ketoenol tautomer compound, (beta) -ketoesters, such as methyl aceto acetate, ethyl aceto acetate, octyl aceto acetate, acetyl aceto acetate, lauryl aceto acetate, and stearyl acetoacetate, acetylacetone, 2 (Beta) -diketone, such as a 4, 4- hexanedione and a benzoyl acetone, is mentioned. In the adhesive composition which uses a polyisocyanate compound as a crosslinking agent, by blocking the isocyanate group which a crosslinking agent has, the excess viscosity rise and gelation of the adhesive composition after mix | blending of a crosslinking agent can be suppressed, and the pot life of an adhesive composition can be extended.

(E) It is preferable that a ketoenol tautomer compound is contained 0.1-300 weight part with respect to 100 weight part of said acrylic polymers.

The (E) ketoenol tautomer compound has the effect of inhibiting crosslinking as opposed to the (D) crosslinking accelerator, so that the ratio of the (E) ketoenol tautomer compound to the (D) crosslinking accelerator is appropriately set. It is desirable to. In order to lengthen the pot life of an adhesive composition and to improve storage stability, it is preferable that the weight part ratio of (E) / (D) is 70-1000, It is more preferable that it is 70-700, It is especially 80-600 desirable.

The acrylic polymer may optionally contain (F) polyalkylene glycol mono (meth) acrylic acid ester monomer as the copolymerizable monomer group. As a (F) polyalkylene glycol mono (meth) acrylic acid ester monomer, the compound in which one hydroxyl group was esterified as (meth) acrylic acid ester among the several hydroxyl groups which polyalkylene glycol has may be sufficient. Since a (meth) acrylic acid ester group becomes a polymeric group, it can copolymerize to the said acrylic polymer. The other hydroxyl group may be OH, or may be alkyl ether such as methyl ether or ethyl ether, or saturated carboxylic acid ester such as acetic acid ester.

Although an ethylene group, a propylene group, butylene group etc. are mentioned as an alkylene group which polyalkylene glycol has, It is not limited to these. The polyalkylene glycol may be a copolymer of two or more kinds of polyalkylene glycols such as polyethylene glycol, polypropylene glycol and polybutylene glycol. As a copolymer of polyalkylene glycol, polyethyleneglycol polypropylene glycol, polyethyleneglycol polybutylene glycol, polypropylene glycol polybutylene glycol, polyethyleneglycol polypropylene glycol polybutylene glycol, etc. are mentioned, The copolymer may be a block copolymer or a random copolymer.

(F) It is preferable that the average repeating number of the alkylene oxide which a polyalkylene glycol mono (meth) acrylic acid ester monomer comprises a polyalkylene glycol chain is 3-14. "Average repeating number of alkylene oxide" is a part of the "polyalkylene glycol chain" contained in the molecular structure of the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer, and an alkylene oxide unit repeats The number of means.

(F) Polyalkylene glycol mono (meth) acrylic acid ester monomer WHEREIN: It is preferable that the diester content in a monomer is 0.2% or less. "The diester powder in a monomer" is content rate (weight%) of the polyalkylene glycol di (meth) acrylic acid ester contained in the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer.

As the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer, polyalkylene glycol mono (meth) acrylate, methoxypolyalkylene glycol (meth) acrylate, and ethoxy polyalkylene glycol (meth) acrylic It is preferable that it is at least 1 sort (s) or more selected from the rates.

More specifically, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polybutylene glycol mono (meth) acrylate, polyethylene glycol polypropylene glycol mono (meth) acrylic Elate, polyethyleneglycol polybutylene glycol mono (meth) acrylate, polypropylene glycol polybutylene glycol mono (meth) acrylate, polyethylene glycol polypropylene glycol polybutylene glycol mono (meth) acrylic Rate; Methoxypolyethylene glycol- (meth) acrylate, methoxy polypropylene glycol- (meth) acrylate, methoxy polybutylene glycol- (meth) acrylate, methoxy-polyethylene glycol-polypropylene glycol- (meth) acrylic Latex, methoxy- polyethyleneglycol- polybutylene glycol- (meth) acrylate, methoxy- polypropylene glycol- polybutylene glycol- (meth) acrylate, methoxy- polyethyleneglycol- polypropylene glycol- polybutylene Glycol- (meth) acrylates; Ethoxy Polyethylene Glycol- (meth) acrylate, Ethoxy Polypropylene Glycol- (meth) acrylate, Ethoxy Polybutylene Glycol- (meth) acrylate, Ethoxy Polyethylene Glycol-Polypropylene Glycol- (meth) acrylic Ethoxy Polyethylene Glycol Polybutylene Glycol (meth) acrylate Ethoxy Polypropylene Glycol Polybutylene Glycol (meth) acrylate Ethoxy Polyethylene Glycol Polypropylene Glycol Polybutylene Glycol- (meth) acrylate, and the like.

(A) When the sum total of the (meth) acrylic acid ester monomer whose C1-C18 carbon number of an alkyl group is 100 weight part, it contains the said (F) polyalkylene glycol mono (meth) acrylic acid ester monomer in the ratio of 0-50 weight part. It is desirable to do it. In the adhesive layer which concerns on this invention, it is not necessary to contain (F) polyalkylene glycol mono (meth) acrylic acid ester monomer in an adhesive composition.

The pressure-sensitive adhesive composition may optionally contain a (H) polyether modified siloxane compound having an HLB value of 7 to 15. The polyether modified siloxane compound is a siloxane compound having a polyether group, and in addition to the usual siloxane unit [-SiR ¹ ₂ -O-], a siloxane unit having a polyether group [-SiR ¹ (R ² O (R ³ O) _n R ⁴ ) -O-]. Wherein R ¹ is one or two or more alkyl groups or aryl groups, R ² and R ³ are one or two or more alkylene groups, and R ⁴ is one or two or more alkyl groups or acyl groups (terminal groups) Indicates. Examples of the polyether group include polyoxyalkylene groups such as polyoxyethylene group [(C ₂ H ₄ O) _n ] and polyoxypropylene group [(C ₃ H ₆ O) _n ].

It is preferable that a polyether modified siloxane compound is a polyether modified siloxane compound whose HLB value is 7-15. Moreover, it is preferable to contain 0.01-1.0 weight part of 1.0 weight part or less (except 0 weight part) of the polyether modified siloxane compound with HLB value 7-15 with respect to 100 weight part of said acrylic polymers. More preferably, it is 0.1-0.5 weight part.

HLB is a hydrophilic lipophilic balance (hydrophilic lipophilic ratio) prescribed | regulated, for example by JISK3211 (surfactant term).

A polyether modified siloxane compound can be obtained by grafting the organic compound which has an unsaturated bond and a polyoxyalkylene group with the hydrosilylation reaction, for example with respect to the polyorganosiloxane main chain which has a silicon hydride group. Specifically, a dimethylsiloxane methyl (polyoxyethylene) siloxane copolymer, a dimethylsiloxane methyl (polyoxyethylene) siloxane, methyl (polyoxypropylene) siloxane copolymer, a dimethylsiloxane methyl (polyoxypropylene) siloxane polymer, etc. Can be mentioned. The HLB value of a polyether modified siloxane compound can be adjusted by selecting the ratio of a polyether group and a siloxane group.

By mix | blending the (H) polyether modified siloxane compound whose HLB value is 7-15 with an adhesive composition, the adhesive force and stainability of an adhesive can be improved. When an adhesive composition does not contain a polyether modified siloxane compound, it becomes low cost.

Moreover, as other components, well-known additives, such as surfactant, a hardening accelerator, a plasticizer, a filler, a hardening retarder, a processing aid, an antioxidant, antioxidant, can be mix | blended suitably with the adhesive composition which concerns on this invention. These are used individually or in combination of 2 or more types.

The acrylic polymer used for the adhesive composition of this invention is a (meth) whose carbon number of an alkyl group is C1-C4 with respect to a total of 100 weight part of the (meth) acrylic acid ester monomer whose carbon number of (A) alkyl group is C1-C18. 1 to 30 parts by weight of at least one of the acrylate ester monomers and (a2) at least one of the (meth) acrylic acid ester monomers having C5 to C18 carbon atoms of the alkyl group as a monomer group copolymerizable with 70 to 99 parts by weight (B ) At least one of the copolymerizable monomers containing a hydroxyl group can be synthesized by copolymerizing 0.1 to 12 parts by weight. (F) Polyalkylene glycol mono (meth) acrylic acid ester monomer may be further included as said monomer group which can be copolymerized. The polymerization method of the acrylic polymer is not particularly limited, and suitable polymerization methods such as solution polymerization and emulsion polymerization can be used.

The adhesive composition of this invention can be manufactured by mix | blending arbitrary additives further suitably with (C) bifunctional or more isocyanate compound, (D) crosslinking accelerator, (E) ketoenol tautomer compound, and acrylic polymer.

The acrylic polymer does not include a copolymerizable monomer containing a carboxyl group and a nitrogen-containing vinyl monomer containing no hydroxyl group, thereby improving the crosslinking speed and stabilizing adhesion. As a monomer reacting with the (C) bifunctional or more isocyanate compound used as a crosslinking agent, it is preferable to use the copolymerizable monomer containing (B) hydroxyl group. As a preferable monomer composition of the said acryl-type polymer, 1 or more types, respectively, in said (A) and said (B), 1 or more types, respectively, in said (A), said (B), and (F) are mentioned.

It is preferable that the adhesive force in the low speed peeling speed 0.3m / min is 0.05-0.1 N / 25mm, and the adhesive force in the high speed peeling speed 30m / min is 1.0N / 25mm or less of the adhesive layer which crosslinks the said adhesive composition. . Thereby, performance with little change also in adhesive force by peeling speed can be obtained, and it becomes possible to peel quickly also by high speed peeling. Moreover, in order to reapply | attach, even when peeling an antistatic surface protection film, excessive force is not needed and it is easy to peel from an adherend.

It is preferable that the surface resistivity of the adhesive layer which crosslinks the said adhesive composition is 5.0x10 ^{+ 12} ohms / square or less, and peeling electrification voltage is "± 0.6 kPa or less". In addition, in this invention, "± 0.6 kPa or less" means 0-0.6 kPa and 0- + 0.6 kPa, ie, -0.6- + 0.6 kPa. When surface resistivity is large, when peeling an antistatic surface protection film from a to-be-adhered body, the performance which will let | release the static electricity generated by charging will fall. For this reason, by making surface resistivity small enough, the peeling electrification voltage generate | occur | produced with the static electricity which arises when a to-be-adhered body peels an adhesive layer can be reduced, and it can suppress that it affects the electrical control circuit of a to-be-adhered body, etc ..

It is preferable that the gel fraction of the adhesive layer (pressure-sensitive adhesive after crosslinking) which crosslinks the adhesive composition of this invention is 95 to 100%. As the gel fraction is high in this manner, the adhesive force does not become excessive at a low peeling speed, and elution of the unpolymerized monomer or oligomer from the acrylic polymer is reduced, and contaminants, durability at high temperature and high humidity are improved, and the adherend Contamination can be suppressed.

The antistatic surface protection film of this invention forms the adhesive layer which crosslinks an adhesive composition on one side or both sides of a resin film. Since the antistatic surface protection film of this invention is formed by the adhesive layer which bridge | crosslinked the adhesive composition in which each component of said (A)-(E) was balanced, it is equipped with the outstanding antistatic performance, and the low speed peeling speed And in a high peeling speed, it is excellent in adhesive force balance, and also excellent in durability performance and staining property. For this reason, it can use preferably as a use of the surface protection film of a polarizing plate.

Although the thickness of the adhesive layer 2 used for the antistatic surface protection film 10 which concerns on this invention is not specifically limited, For example, thickness of about 5-40 micrometers is preferable, and thickness of about 10-30 micrometers is preferable. Is more preferable. When peeling strength (adhesive force) with respect to the surface of the to-be-adhered body of an antistatic surface protection film is the adhesive layer 2 which has a non-adhesive force of about 0.03-0.3 N / 25 mm, when peeling an antistatic surface protection film from a to-be-adhered body. It is preferable at the point which the operability of is excellent. Moreover, the peeling force from the adhesive layer 2 of the peeling film 5 is 0.2N / 50mm or less from the point which is excellent in the operability at the time of peeling the peeling film 5 from the antistatic surface protection film 10. desirable.

Moreover, the peeling film 5 used for the antistatic surface protection film 10 which concerns on this invention uses the resin composition containing the peeling agent which has a dimethylpolysiloxane as a main component, and an antistatic agent on one side of the resin film 3 The used release agent layer 4 is formed. It is preferable that the releasing agent layer 4 contains the liquid silicone type compound further at 20 degreeC. It is preferable that the silicone compound in the releasing agent layer 4 is polyether modified silicone.

Although the polyester film, the polyamide film, the polyethylene film, the polypropylene film, the polyimide film etc. are mentioned as the resin film 3, A polyester film is especially preferable at the point which is excellent in transparency and a comparatively low price. Do. The resin film may be a non-stretched film or may be a film uniaxially or biaxially stretched. In addition, you may control the draw ratio of a stretched film, and the oriented angle of the axial direction formed with crystallization of a stretched film to a specific value.

Although the thickness of the resin film 3 is not specifically limited, For example, the thickness of about 12-100 micrometers is preferable, It is easy to handle if it is about 20-50 micrometers thickness, and it is more preferable.

Moreover, you may perform the easily adhesion process, such as surface modification by corona discharge, application | coating of an anchor coat agent, to the surface of the resin film 3 as needed.

As a releasing agent which has the dimethyl polysiloxane which comprises the releasing agent layer 4 as a main component, well-known silicone type peeling agents, such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type, are mentioned. As a product marketed as an addition reaction type silicone type | system | group release agent, KS-776A, KS-847T, KS-779H, KS-837, KS-778, KS-830 (made by Shin-Etsu Chemical Co., Ltd.), SRX- 211, SRX-345, SRX-357, SD7333, SD7220, SD7223, LTC-300B, LTC-350G, LTC-310 (made by Toray Dow Corning). As a product marketed as a condensation reaction type, SRX-290, SYLOFF-23 (made by Toray Dow Corning Co., Ltd.), etc. are mentioned, for example. As a product commercially available as a cation polymerization type, TPR-6501, TPR-6500, UV9300, UV9315, UV9430 (made by Momentive Performance Materials), X62-7622 (made by Shin-Etsu Chemical Co., Ltd.) Etc. can be mentioned. As a product commercially available as a radical polymerization type, X62-7205 (made by Shin-Etsu Chemical Co., Ltd.) etc. is mentioned, for example.

Examples of the liquid silicone compound at 20 ° C constituting the release agent layer 4 include polyether modified silicone, alkyl modified silicone, carbinol higher fatty acid ester modified silicone, and the like. In this invention, in order to improve the antistatic property of the surface of an adhesive layer, the liquid silicone type compound is used at 20 degreeC of the state compatible with the releasing agent layer which has a dimethyl polysiloxane as a main component. Polyether modified silicone is preferable among the modified silicone compounds for the use of this invention. The polyether chain in the polyether-modified silicone is composed of ethylene oxide, propylene oxide, and the like. For example, by selecting the molecular weight of the polyethylene oxide used for the side chain, physical properties such as compatibility with a silicone release agent and an antistatic effect This is adjusted.

Moreover, in the product marketed as polyether modified silicone, KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-642 (made by Shin-Etsu Chemical Co., Ltd.), SH8400, SH8700, SF8410 (manufactured by Toray Dow Corning Co., Ltd.), TSF-4440, TSF-4441, TSF-4445, TSF-4446, TSF-4450 (manufactured by Momentive Performance Materials), BYK-300, BYK And -306, BYK-307, BYK-320, BYK-325, BYK-330 (manufactured by BIC Chem Corporation), and the like.

Although the amount of the silicone-based compound added at 20 ° C. to the releasing agent mainly containing dimethylpolysiloxane varies depending on the type of the silicone-based compound and the degree of compatibility with the releasing agent, it is desired to peel the antistatic surface protective film from the adherend. What is necessary is just to consider the peeling charge voltage, the contamination with respect to a to-be-adhered body, adhesive characteristics, etc.

As an antistatic agent which comprises the releasing agent layer 4, it is preferable that dispersibility is favorable with respect to the releasing agent solution which has a dimethyl polysiloxane as a main component, and does not inhibit hardening of the releasing agent which has a dimethyl polysiloxane as a main component. As such an antistatic agent, an alkali metal salt is preferable.

As an alkali metal salt, the metal salt which consists of lithium, sodium, and potassium is mentioned. Specifically, for example, Li ^+, Na ^+, and cations consisting of ^{K +, Cl -, Br -} , I -, BF 4 -, PF 6 -, SCN -, ClO 4 -, CF 3 SO 3 - ^{_{, (FSO 2) 2 N -}} , (CF 3 SO 2) 2 N -, (C 2 F 5 SO 2) 2 N -, (CF 3 SO 2) 3 C - anion to metal salt is preferably constituted by comprising the Used. Among them, LiBr, LiI, LiBF ₄ , LiPF ₆ , LiSCN, LiClO ₄ , LiCF ₃ SO ₃ , Li (FSO ₂ ) ₂ N, Li (CF ₃ SO ₂ ) ₂ N, Li (C ₂ F ₅ SO _{2 ) 2 N, Li (CF 3} SO 2) 3 lithium salt, such as C (Li salt), _{particularly, Li (CF 3 SO 2)} 2 N "weak symbol LiTFSI", Li (FSO _{2) 2} N "weak symbol LiFSI And LiCF ₃ SO ₃ "abbreviated symbol LiTF or LiTf" are used preferably. These alkali metal salts may be used alone, or may be used by mixing two or more kinds. In order to stabilize an ionic substance, you may add the compound containing a polyoxyalkylene structure.

The amount of the antistatic agent added to the release agent containing dimethylpolysiloxane as a main component varies depending on the type of antistatic agent and the degree of affinity with the release agent, but the desired peeling electrification voltage when peeling the antistatic surface protective film from the adherend, and What is necessary is just to set it in consideration of the contamination property, adhesiveness, etc. with respect to a complex.

The mixing method of the release agent and antistatic agent which have dimethylpolysiloxane as a main component is not specifically limited. After adding and mixing an antistatic agent to the releasing agent which has a dimethyl polysiloxane as a main component, and mixing and adding a catalyst for releasing agent hardening, and diluting the releasing agent which has a dimethyl polysiloxane as a main component with the organic solvent previously, Any method, such as the method of adding and mixing, and the method of adding and mixing a catalyst after diluting the peeling agent which has a siloxane as a main component in the organic solvent beforehand, and then adding and mixing an antistatic agent after that may be sufficient. Moreover, you may add the material which assists antistatic effect, such as adhesion improvers, such as a silane coupling agent, and a compound containing a polyoxyalkylene group, as needed.

The mixing method of polyether modified silicone with respect to a peeling agent is the same as the mixing method with an antistatic agent, and is not specifically limited.

Although the mixing ratio of the releasing agent and antistatic agent which have dimethylpolysiloxane as a main component is not specifically limited, The ratio of about 5-100 is preferable as solid content with respect to solid content 100 of the releasing agent which has dimethylpolysiloxane as a main component. If the amount of solid content added to the antistatic agent is less than the ratio of 5 with respect to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, the transfer amount of the antistatic agent to the surface of the pressure-sensitive adhesive layer also decreases, making it difficult to exert the antistatic function on the pressure-sensitive adhesive. When the amount of solid content added of the antistatic agent exceeds 100 to the solid content 100 of the release agent containing dimethylpolysiloxane as the main component, the release agent containing dimethylpolysiloxane as the main component together with the antistatic agent is transferred to the surface of the pressure-sensitive adhesive layer. There is a possibility that the adhesion characteristic of the resin may be reduced.

The mixing ratio of the polyether modified silicone to the release agent is preferably about the same as the mixing ratio of the antistatic agent, and is not particularly limited.

The method of forming the adhesive layer 2 in the base film 1 of the antistatic surface protection film 10 which concerns on this invention, and the method of bonding the peeling film 5 may be performed by a well-known method, and are not specifically limited. . Specifically, after (1) apply | coating and drying the resin composition for forming the adhesive layer 2 on one surface of the base film 1, and forming an adhesive layer, the method of bonding together the peeling film 5, ( 2) After apply | coating and drying the adhesive composition for forming the adhesive layer 2 on the surface of the peeling film 5, and forming an adhesive layer, the method of bonding the base film 1, etc. are mentioned, However, either method You can also use

In addition, what is necessary is just to form the adhesive layer 2 in the surface of the base film 1 by a well-known method. Specifically, known coating methods such as reverse coating, comma coating, gravure coating, slot die coating, Meyer bar coating and air knife coating can be used.

In addition, what is necessary is just to form the release agent layer 4 in the resin film 3 by a well-known method. Specifically, well-known coating methods, such as gravure coating, Mayer bar coating, and air knife coating, can be used.

It is sectional drawing which shows the state which peeled the peeling film from the antistatic surface protection film of this invention.

By peeling the peeling film 5 from the antistatic surface protection film 10 shown in FIG. 1, a part of antistatic agent (reference numeral 7) contained in the peeling agent layer 4 of the peeling film 5 is an antistatic surface It is transferred (attached) to the surface of the adhesive layer 2 of the protective film 10. For this reason, in FIG. 2, the antistatic agent transferred to the surface of the adhesive layer 2 of an antistatic surface protection film is shown typically by the spot of 7.

In the antistatic surface protection film which concerns on this invention, in bonding the antistatic surface protection film 11 of the state which peeled the peeling film shown in FIG. 2 to a to-be-adhered body, the charge transferred to the surface of this adhesive layer 2 The inhibitor contacts the surface of the adherend. Thereby, peeling charge voltage at the time of peeling an antistatic surface protection film from a to-be-adhered body can be suppressed low again.

3 is a cross-sectional view showing an embodiment of the optical component of the present invention.

From the antistatic surface protection film 10 of this invention, the peeling film 5 peels and the adhesive layer 2 is exposed, and the optical component 8 which is a to-be-adhered body via the adhesive layer 2 is shown. It is bonded.

That is, the optical component 20 in which the antistatic surface protection film 10 of this invention was bonded is shown by FIG. As optical components, optical films, such as a polarizing plate, retardation plate, a lens film, a polarizing plate for retardation plate, and a polarizing plate for lens film, are mentioned. Such an optical component is used as a constituent member of various display devices, such as a liquid crystal display panel and an organic electroluminescent display panel, and optical system devices of various instruments. Moreover, optical films, such as an antireflection film, a hard-coat film, and a transparent conductive film for touch panels, are mentioned as an optical component. In particular, the surface is bonded to the antifouling surface of optical films, such as a low reflection processing polarizing plate (LR polarizing plate) and an anti-glare low reflection processing polarizing plate (AG-LR polarizing plate), which are surface-treated with a silicon compound, a fluorine compound, etc. It can use suitably as an antistatic surface protection film.

Examples of the low reflection surface treatment layer of the LR polarizing plate include anti-reflection films such as metal oxide thin films (such as vapor deposition films such as SiO ₂ and TiO ₂ ) and fluorine resins. The antistatic surface protection film of the present invention can achieve both a reduction in peeling electrification voltage and low contamination on the adherend even when the pressure sensitive adhesive layer of the antistatic surface protection film is bonded to and bonded to these antireflection films.

According to the optical component of the present invention, when the antistatic surface protection film 10 is peeled off from the optical component (optical film) that is the adherend, the peeling electrification voltage can be sufficiently reduced, so that the driver IC, the TFT element, and the gate are There is no possibility of destroying circuit components, such as a line drive circuit, the production efficiency in the process of manufacturing a liquid crystal display panel, an organic electroluminescence display, etc. can be improved, and the reliability of a production process can be maintained.

Example

Next, an Example demonstrates this invention in detail.

<Production of Adhesive Composition>

Example 1

Nitrogen gas was introduce | transduced into the reaction apparatus provided with the stirrer, the thermometer, the reflux cooler, and the nitrogen inlet tube, and the air in the reaction apparatus was substituted with nitrogen gas. Thereafter, together with 10 parts by weight of methyl acrylate, 90 parts by weight of 2-ethylhexyl acrylate, 5.0 parts by weight of 8-hydroxyoctyl acrylate, and 10 parts by weight of polypropylene glycol monoacrylate (n = 12) 60 weight part of solvents (ethyl acetate) were added. Then, 0.1 weight part of azobisisobutyronitrile was dripped over 2 hours as a polymerization initiator, and it was made to react at 65 degreeC for 6 hours, and the acrylic polymer solution of Example 1 which obtained the weight average molecular weight 500,000 was obtained. After adding and stirring 8.5 weight part of acetylacetones with respect to this acryl-type polymer solution, 2.0 weight part of coronate HX (isocyanurate body of a hexamethylene diisocyanate compound), and 0.1 weight part of titanium trisacetyl acetonates are added, and it stirred, It mixed and obtained the adhesive composition of Example 1.

[Examples 2 to 6 and Comparative Examples 1 to 3]

The adhesive composition of Examples 2-6 and Comparative Examples 1-3 was obtained like Example 1 except having performed the composition of the adhesive composition of Example 1 as Table 1 and Table 2, respectively. In Table 1 and Table 2, the monomer contained in the acrylic polymer (copolymerized) is (A), (B), (F) and "carboxyl group-containing monomer."

Table 1 and Table 2 divide | divided all the tables which show the compounding ratio of each component into two, and the numerical value of the weight part which calculated | required the total of all (A) group as 100 weight part is shown in parentheses. In addition, the compound name of the symbol of each component used for Table 1 and Table 2 is shown in Table 3 and Table 4. Here, Coronate (trademark) HX, HL, and L are brand names of Toso Corporation, and Takenate (trademark) D-140N, D-127N, and D-110N are brand names of Mitsui Chemicals Corporation. In Table 2, the "antistatic agent" and Table 7 described later, LiTFSI represents Li (CF ₃ SO ₂ ) ₂ N, LiFSI represents Li (FSO ₂ ) ₂ N, and LiTF represents LiCF ₃ SO ₃ . In addition, in the compound used for the (F) polyalkylene glycol mono (meth) acrylic acid ester monomer of each Example, the diester content in a monomer is 0.2% or less.

<Synthesis of Bifunctional Isocyanate Compound>

The bifunctional isocyanate compound of the synthesis examples 1 and 2 was synthesize | combined by the following method. As shown in Table 5 and Table 6, the diisocyanate and the diol compound were mixed at a molar ratio of NCO / OH = 16, reacted at 120 ° C for 3 hours, and then unreacted under reduced pressure using a thin film evaporator. Diisocyanate was removed, and the target bifunctional isocyanate compound was obtained.

<Production of an antistatic surface protection film>

Example 1

5 parts by weight of addition reaction type silicone (Toray Dow Corning Co., Ltd., product name: SRX-345), polyether modified silicone (manufactured by Toray Dow Corning Co., Ltd., product name: SH8400, main component: dimethyl, methyl (polyethylene oxide acetate) 0.15 parts by weight of siloxane, 0.5 parts by weight of Li (CF ₃ SO ₂ ) ₂ N, 95 parts by weight of a 1: 1 mixed solvent of toluene and ethyl acetate, and a platinum catalyst (manufactured by Toray Dow Corning, Inc., product name: SRX-212 Catalyst) 0.05 weight part was mixed, stirred and mixed, and the coating material which forms the release agent layer of Example 1 was adjusted. On the surface of the polyethylene terephthalate film having a thickness of 38 µm, the coating material forming the release agent layer of Example 1 was applied so that the thickness after drying was 0.2 µm, and dried in a hot air circulation oven at 120 ° C. for 1 minute, The release film of Example 1 was obtained.

The pressure-sensitive adhesive composition of Example 1 was applied onto the surface of a polyethylene terephthalate film having a thickness of 38 μm so as to have a thickness of 20 μm after drying, and then dried in a hot air circulation oven at 100 ° C. for 2 minutes to form an adhesive layer. Then, the release agent layer (silicone treatment surface) of the release film of Example 1 produced above was bonded to the surface of this adhesive layer. The obtained adhesive film was kept in 40 degreeC environment for 5 days, the adhesive was hardened and the antistatic surface protection film of Example 1 was obtained.

Example 2

The pressure-sensitive adhesive composition of Example 1 was used as the pressure-sensitive adhesive composition of Example 2, and the antistatic agent used for the release agent layer was LiCF ₃ SO ₃ . Except for the same thing as Example 1, the antistatic surface protection film of Example 2 was obtained.

[Examples 3 to 6]

Example 1 of pressure-sensitive adhesive composition of Examples 3-6, respectively, and the pressure-sensitive adhesive composition, in the same manner as the antistatic agent used for the release agent layer as in Example 1 Li (FSO ₂₎ put up in ₂ N, except in Example 3 to The antistatic surface protection film of 6 was obtained.

Comparative Example 1

5 parts by weight of addition reaction type silicone (manufactured by Toray Dow Corning Co., Ltd., SRX-345), 95 parts by weight of a mixed solvent of toluene and ethyl acetate 1: 1 and platinum catalyst (manufactured by Toray Dow Corning Co., Ltd. : SRX-212 Catalyst) 0.05 weight part was mixed, stirred and mixed, and the coating material which forms the release agent layer of the comparative example 1 was adjusted. On the surface of the polyethylene terephthalate film having a thickness of 38 µm, a coating material for forming a release agent layer of Comparative Example 1 was applied so that the thickness after drying was 0.2 µm, and dried in a hot air circulation oven at 120 ° C. for 1 minute, The release film of Comparative Example 1 was obtained.

The pressure-sensitive adhesive composition of Comparative Example 1 was applied to the surface of a polyethylene terephthalate film having a thickness of 38 μm so as to have a thickness of 20 μm after drying, and then dried in a hot air circulation oven at 100 ° C. for 2 minutes to form an adhesive layer. Then, the release agent layer (silicon treatment surface) of the release film of the comparative example 1 produced above was bonded to the surface of this adhesive layer. The obtained adhesive film was kept in 40 degreeC environment for 5 days, the adhesive was hardened and the antistatic surface protection film of the comparative example 1 was obtained.

Comparative Example 2

Except having made the adhesive composition of the comparative example 1 the adhesive composition of the comparative example 2, it carried out similarly to the comparative example 1, and obtained the antistatic surface protection film of the comparative example 2.

Comparative Example 3

The antistatic surface of Comparative Example 3 was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive composition of Example 1 was used as the pressure-sensitive adhesive composition of Comparative Example 3, and the antistatic agent used in the release agent layer was Li (FSO ₂ ) ₂ N. A protective film was obtained.

In Table 7, the composition of the releasing agent layer in the antistatic surface protection film of Examples 1-6 and Comparative Examples 1-3 is shown.

<Test method and evaluation>

After aging the antistatic surface protection film in Examples 1-6 and Comparative Examples 1-3 for 7 days in 23 degreeC and 50% RH atmosphere, the peeling film (silicone resin-coated PET film) was peeled off and an adhesive What expressed the layer was made into the measurement sample of surface resistivity.

Moreover, after bonding the antistatic surface protection film which expressed this adhesive layer to the surface of the polarizing plate pasted on the liquid crystal cell via the adhesive layer, and leaving it for 1 day, it autoclave-processes 50 degreeC, 5 atmospheres, and 20 minutes, and room temperature What was left to stand again for 12 hours was made into the measurement sample of adhesive force, peeling electrification voltage, and contamination property.

<Adhesive force>

The low-speed peeling speed (0.3 m / min) and the high-speed peeling speed (30 m /) using the tensile tester for the measurement sample obtained by attaching the antistatic surface protection film of 25 mm width to the surface of a polarizing plate in the 180 degree direction obtained above. It peeled in min) and measured the peeling strength as adhesive force.

<Surface resistivity>

After aging, before bonding to a polarizing plate, the peeling film (silicone resin-coated PET film) was peeled off and the adhesive layer was exposed, and the resistive layer of the adhesive layer was used using the resistivity meter Hirestar UP-HT450 (manufactured by Mitsubishi Chemical Analyzer). Surface resistivity was measured.

<Peeling large voltage>

When the measurement sample obtained above was peeled 180 ° at a tensile speed of 30 m / min, the voltage (large voltage) generated by charging the polarizing plate was measured using the high-precision electrostatic sensors SK-035 and SK-200 (manufactured by Keyence Co., Ltd.). And the maximum value of the measured value was made into peeling electrification voltage.

<Pollutant>

On one surface of a glass plate, the polarizing plate which gave the low reflection surface treatment is bonded together via an adhesive layer (for example, double-sided adhesive tape different from the adhesive layer of an antistatic surface protection film) using a bonding machine. Then, the antistatic surface protection film is bonded to the surface of a polarizing plate using a bonding machine. After storing for 3 days and 30 days in 23 degreeC and 50% RH environment, an antistatic surface protection film is peeled off and the contamination state of the surface of a polarizing plate is visually observed.

Surface contamination is the case where there is no contamination in any of the storage for 3 days and the storage for 30 days with respect to the surface of the polarizing plate. (Triangle | delta) "and the case where there exists a contamination were evaluated by" x ".

Table 8 shows the results of the evaluation. Here, the surface resistivity was described by the method of making "m * 10 ^{+ n} " into "mE + n" (m is arbitrary real value and n is a positive integer).

The following is understood from the measurement result shown in Table 8.

The antistatic surface protection films of Examples 1 to 6 according to the present invention have a moderate adhesive force, no contamination on the surface of the adherend, and a peeling electrification voltage when the antistatic surface protection film is peeled from the adherend. low.

On the other hand, the antistatic surface protection film of Comparative Example 1 in which the antistatic agent was added to the pressure sensitive adhesive layer was low in surface resistivity of the pressure sensitive adhesive layer and was good, but slightly contaminated.

In addition, the antistatic surface protection film of the comparative example 2 is a copolymer containing the (meth) acrylic acid ester monomer whose C1-C4 carbon number of (a1) alkyl group is added to what added the antistatic agent to the adhesive layer, and (B) hydroxyl group. The adhesive force was large, the peeling electrification voltage was high, and the contamination was a little inferior because the addition amount of the possible monomer was large.

In addition, the antistatic surface protective film of Comparative Example 3 has an adhesive strength in that the acrylic polymer does not contain a (meth) acrylic acid ester monomer having a C1 to C4 carbon number of the (a1) alkyl group and a monomer containing a carboxyl group. It was big and polluted.

That is, in Comparative Examples 1 and 2 in which the antistatic agent is mixed in the pressure-sensitive adhesive layer, it is difficult to achieve both reduction of peeling electrification voltage and low contamination on the adherend. On the other hand, in Examples 1-6 which transferred the antistatic agent contained in a releasing agent layer to the surface of an adhesive layer after adding an antistatic agent to a releasing agent layer, even if a small amount of antistatic agent is added to a releasing agent layer, the effect of reducing peeling electrification voltage Since there existed, there was no contamination with a to-be-adhered body, and the favorable antistatic surface protection film was obtained.

The antistatic surface protection film of the present invention is, for example, in order to protect the surface of the optical component or the like in optical films such as polarizing plates, retardation plates, display lens films, and other production processes of various optical components. Can be used. In particular, when used as an antistatic surface protective film of an optical film such as an LR polarizing plate or an AG-LR polarizing plate whose surface is antifouling with a silicon compound, a fluorine compound or the like, the amount of static electricity generated when peeling from the adherend is reduced. can do.

The antistatic surface protective film of the present invention can improve the yield of the production process of optical films, optical parts, etc. in that the contamination to the adherend is small, and does not deteriorate with time and has excellent antistatic peeling performance. The value of use is great.

One… Base film, 2... Pressure-sensitive adhesive layer; Resin film, 4... Release agent layer, 5... Release film, 7... Antistatic agent, 8... Adherend (optical component), 10.. Antistatic surface protective film, 11... Antistatic surface protection film which peeled release film, 20... Optical component which bonded antistatic surface protection film.

Claims (14)

As a manufacturing method of an antistatic surface protection film, following process (1)-(3),
Step (1): An adhesive composition containing an acrylic polymer, wherein the acrylic polymer is
(a1) 1-30 weight part of at least 1 sort (s) of the (meth) acrylic acid ester monomer whose C1-C4 carbon number of an alkyl group,
(a2) At least 1 sort (s) of the (meth) acrylic acid ester monomer whose C3-C18 carbon number of an alkyl group is 100 weight part in total of 70-99 weight part,
As a monomer group which can be copolymerized, it consists of the acryl-type polymer of the copolymer which copolymerized at least 1 sort (s) of the copolymerizable monomer containing (B) hydroxyl group in 0.1-12 weight part ratio,
The acrylic polymer does not copolymerize a copolymerizable monomer containing a carboxyl group and a nitrogen-containing vinyl monomer containing no hydroxyl group,
The pressure-sensitive adhesive composition further contains (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator, and (E) a ketoenol tautomer compound, and further contains no antistatic agent (alkoxy Manufacturing an acrylic polymer obtained by copolymerizing a group-containing alkyl (meth) acrylate monomer);
Process (2): The process of forming the adhesive layer which bridge | crosslinked the said adhesive composition in one surface of the base film which consists of resin which has transparency,
Process (3): The peeling film in which the release agent layer containing an antistatic agent was laminated | stacked on the surface of the said adhesive layer was laminated | stacked through the said release agent layer, and the said antistatic agent of the said release agent layer is the said adhesive Process transferred to the surface of the layer
Is prepared through the order of Steps (1) to (3),
The release agent layer is formed by a resin composition containing a release agent containing dimethylpolysiloxane and an antistatic agent,
After bonding the said adhesive layer to the polarizing plate to which the low reflection surface treatment was performed, the peeling electrification voltage at the time of peeling is ± 0.6 kPa or less,
When the pressure-sensitive adhesive layer is bonded to the low-reflective surface-treated polarizing plate, and stored in a 23 ° C. and 50% RH environment for 3 days and 30 days, and then peeled off, 3 days with respect to the surface of the polarizing plate A method for producing an antistatic surface protection film, characterized in that there is no contamination in any of storage and storage for 30 days. delete delete As an antistatic surface protection film in which the adhesive layer which crosslinked the adhesive composition containing an acrylic polymer is formed in one surface of the base film which consists of resin with transparency,
The acrylic polymer,
(a1) 1-30 weight part of at least 1 sort (s) of the (meth) acrylic acid ester monomer whose C1-C4 carbon number of an alkyl group,
(a2) At least 1 sort (s) of the (meth) acrylic acid ester monomer whose C3-C18 carbon number of an alkyl group is 100 weight part in total of 70-99 weight part,
As a monomer group which can be copolymerized, it consists of the acryl-type polymer of the copolymer which copolymerized at least 1 sort (s) of the copolymerizable monomer containing (B) hydroxyl group in 0.1-12 weight part ratio,
The acrylic polymer does not copolymerize a copolymerizable monomer containing a carboxyl group and a nitrogen-containing vinyl monomer containing no hydroxyl group,
The pressure-sensitive adhesive composition (except for containing an acrylic polymer obtained by copolymerizing an alkoxy group-containing alkyl (meth) acrylate monomer) further includes (C) a bifunctional or higher isocyanate compound, (D) a crosslinking accelerator, and (E ) Ketoenol tautomer compound, and also no antistatic agent,
A peeling film in which a release agent layer containing an antistatic agent is laminated on one surface of the resin film is laminated on the surface of the pressure sensitive adhesive layer via the release agent layer, and the antistatic agent of the release agent layer is formed on the surface of the pressure sensitive adhesive layer. Done in warrior
The release agent layer is formed of a resin composition containing a release agent containing dimethylpolysiloxane, a liquid silicone compound and an antistatic agent at 20 ° C,
The pressure-sensitive adhesive layer is bonded to a low-reflection surface-treated polarizing plate, and stored at 23 ° C. in a 50% RH environment for 3 days and 30 days, and then peeled off, and then stored for 3 days with respect to the surface of the polarizing plate. And there is no contamination in any of the storage for 30 days, antistatic surface protective film, characterized in that. The method of claim 4, wherein
In addition to the said adhesive composition, 1-30 weight part of at least 1 sort (s) of the (meth) acrylic acid ester monomer whose carbon number of said (a1) alkyl group is C1-C4, and (meth) whose carbon number of said (a2) alkyl group is C5-C18 The average repeating number of the alkylene oxide which comprises (F) polyalkylene glycol chain is 3-14 with respect to 100 weight part of total of 70-99 weight part of at least 1 sort (s) of acrylic acid ester monomer, and the diester content in a monomer is 0.2 An antistatic surface protective film comprising a polyalkylene glycol mono (meth) acrylic acid ester monomer which is% or less at a ratio of 0 to 50 parts by weight (but may not be included). The method according to claim 4 or 5,
The crosslinking accelerator (D) is at least one or more selected from the group consisting of an aluminum chelate compound, a titanium chelate compound, and an iron chelate compound, and 0.001 to 0.5 parts by weight based on 100 parts by weight of the acrylic polymer, and the (E) ketoene It contains 0.1-300 weight part of all tautomer compounds, and the weight part ratio of (E) / (D) is 70-1000, The antistatic surface protection film characterized by the above-mentioned. delete delete delete delete delete delete The optical film in which the antistatic surface protection film of Claim 4 or 5 is bonded together. delete

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