KR20110135699A - Adhesive tape for surface protection - Google Patents

Abstract

PURPOSE: An adhesive tape for surface protection is provided to maintain the low peeling force, prevent drop-out to adhesive layer, and have excellent winding property and low surface energy, thereby improving contamination prevention property. CONSTITUTION: An adhesive tape for surface protection comprises poly olefin film layer. The poly olefin film layer laminates a cohesion layer and release treating layer. The release treating layer comprises acrylate-silicon copolymer, hardener and catalyst. The release treating layer has more than 90% of residue peeling force, more than 90% of the conservative ratio of peeling force, and 15-30dyne/cm of surface energy. The acrylate-silicon copolymer is obtained by 45-87wt% acrylate monomer, 10-40wt% acrylate monomer containing siloxane group, 3-15wt% monomer containing cross-linkable functional group. The acrylate monomer is (meta)acrylate which contains C1-12 alkyl group.

Description

Adhesive Tape for Surface Protection

The present invention relates to a pressure-sensitive adhesive tape for surface protection, and more particularly, the pressure-sensitive adhesive layer is excellent in preservation of residual peeling force and peeling force after impregnation of an organic solvent even though it is produced by release treatment at a low temperature, and also maintains low peeling on a magnetic back surface. The present invention relates to an adhesive tape for surface protection having excellent anti-fouling properties due to high reliability and excellent surface rewinding property and no dropout.

Recently, optical films (optical sheets) constituting liquid crystal displays (LCDs), plasma displays (PDPs), organic EL (electroluminescence), field emission displays, and steel sheets or glass for home appliances such as mobiles, refrigerators, washing machines, and air conditioners. There is a variety of materials, such as. In addition, these finished products are subjected to various surface treatments for abrasion resistance, chemical resistance, scratch resistance, and the like. However, since these parts are not free from defects such as foreign material inflow, scratches, or stamps during transportation from the material manufacturer, the surface protection film is usually attached to the parts and the product surface to prevent damage to expensive products.

Since the adhesive tape for surface protection is in direct contact with parts and finished products, there should be no contamination of the surface of the adherend, and since the peeling property should be good after use, it becomes an important material in the adhesive tape. However, in order to lower the price, the adhesive tape is usually formed integrally in which the adhesive layer meets on the backside treatment layer except that the release film enters the adhesive side of the adhesive tape.

In addition, due to the optical properties and the strength of the film, a conventional polyester film is used as a base material of the tape, a lot of stretched or unstretched polyolefin film to reduce the cost. Therefore, there is a need for improvement in the part of the coating as conditions such as the release treatment on the back surface processed on the polyester film or the pressure-sensitive adhesive coating have to be processed at a low temperature that the unstretched polyolefin film can withstand without being processed at a high temperature. Was done. In this case, if the adhesive tape is high peeled from the back of the magnetic layer, it is difficult to rewind, so that when the adhesive tape is attached to the adherend, there is a lot of noise or a defect that the adhesive tape is stretched. However, the release coating layer used for low peeling has caused a problem that the low molecular material is transferred to the pressure-sensitive adhesive layer to cause contamination of the final adherend to date. Therefore, the reliability of the characteristics of the back coating layer or the back release layer in addition to the pressure-sensitive adhesive layer has become important.

On the other hand, in Japanese Patent Laid-Open No. 2000-026814, the peeling force was reduced by using a silicone resin in which curing was caused by radiation in order to improve rewinding. However, such a technique has a problem that a defect that causes contamination of the adhesive and the adherend occurs due to the generation of low molecular weight of the silicon-based. Therefore, in order to suppress the generation of low molecules, the curing at high temperature should be performed, but in the case of the surface protective adhesive tape, since the non-stretched polyolefin film having a low melting point is used, the film shrinks when curing at high temperature. In order to increase or increase the curing temperature or time, a stretched polyolefin film may be used, but the film is hardened in the drawing process, so that the film is vulnerable to being pressed or pressed.

In addition, Japanese Patent Laid-Open Publication No. 2006-036882 has secured excellent rewinding property by using a reaction product of a polyvinyl polymer containing an active hydroxyl group and a cyclic alkylisocyanate compound in the back treatment layer of the base layer. In practice, however, over time, the tape of this combination has a problem that the rewinding force is increased and the workability of the paste is bad.

In order to solve the above problem, Korean Unexamined Patent Publication No. 2008-0039292 and Japanese Patent Publication No. 2008-133435 use acrylic silicone graft polymer to reduce surface energy and peel force and to secure reliability. However, the peeling force should be maintained when measuring the residual peeling force to determine whether the transfer of silicon or other low molecular weight material of the release layer occurs, but the peeling force may be reduced. In addition, there is a limit in increasing hardening and increasing reliability of the back release layer because of limitations in increasing or increasing the temperature or time of hardening.

On the other hand, in the conventional silicon-based release layer there is an additional problem that the release agent is dropped toward the pressure-sensitive adhesive layer due to the influence of humidity. In addition, in the manufacture of a silicon-based release treatment layer, a platinum-based catalyst may be used to lower the curing temperature. However, even if the temperature is lowered, it is difficult to secure reliability at 100 degrees or less.

Therefore, the present inventors confirmed that when the acrylate-silicone copolymer is used as one component of the adhesive in the surface protective adhesive tape of the present invention, it is possible to form a release layer even at low temperature, but also to produce an adhesive tape showing excellent peeling force. The present invention has been completed.

Japanese Patent Laid-Open No. 2000-026814 Japanese Patent Laid-Open No. 2006-036882 Korean Laid-Open Patent No. 2008-0039292 Japanese Patent Publication No. 2008-133435

The present invention has been made to solve the above problems, the object of the present invention is excellent in preservation of the residual peeling force and peeling force after impregnation of the organic solvent even if the release treatment at a low temperature produced, and also low peeling on the magnetic back It is to provide a surface protection adhesive tape having excellent anti-fouling properties with low reliability and excellent surface rewinding properties without dropping into the pressure-sensitive adhesive layer while maintaining a.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

The object is a pressure-sensitive adhesive tape for laminating a pressure-sensitive adhesive layer on one side of the polyolefin film base layer, a release treatment layer on the other side, the release layer is an adhesive layer comprising an acrylate-silicone copolymer, a curing agent and a catalyst. It is achieved by a surface protection adhesive tape characterized in that.

Here, the release treatment layer is characterized in that the residual peeling force is 90% or more, the peeling force retention after the organic solvent impregnation is 90% or more, the surface energy is 15 ~ 30 dyne / cm.

Preferably, the acrylate-silicone copolymer is 45 to 87% by weight of the acrylate monomer; It is a copolymer obtained by polymerizing 10-40 weight% of acrylate monomers which have a siloxane group, and 3-15 weight% of monomers containing a crosslinkable functional group.

Preferably, the acrylate monomer is characterized in that (meth) acrylate having an alkyl group having 1 to 12 carbon atoms.

Preferably, the acrylate monomer having the siloxane group is a compound represented by the following formula (1),

[Formula 1]

R ₁ is an alkyl group having 0 to 2 carbon atoms, and R ₂ is an alkyl group having 1 to 10 carbon atoms; m and n are each an integer of 0-10.

Preferably, the monomer containing a crosslinkable functional group is characterized in that the acrylate monomer having at least one functional group selected from the group consisting of hydroxy group, carboxyl group, epoxy group, vinyl group and amide group.

Preferably, the curing agent is characterized in that at least one selected from the group consisting of an isocyanate compound, an epoxy compound, a melamine-based resin and an aziridine-based compound.

Preferably, the content of the curing agent is characterized in that 0.5 to 10 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer.

Preferably, the catalyst is characterized in that at least one from the group consisting of amine compound, tin compound and non-tin compound.

Preferably, the content of the catalyst is characterized in that 0.01 to 3 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer.

According to the present invention, it is excellent in preservation of residual peeling force and peeling force after impregnation of organic solvent even though it is manufactured by demolding at low temperature, and it is excellent in rewinding property without falling off to the adhesive layer while maintaining low peeling on the magnetic backing. High reliability and low surface energy has the effect of excellent pollution prevention characteristics.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. These examples are only presented by way of example only to more specifically describe the present invention, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

The surface protection adhesive tape according to the present invention is a surface protection adhesive tape in which an adhesive layer and a release treatment layer are laminated on one surface of a polyolefin film base layer, and the release treatment layer comprises an acrylate-silicon copolymer, a curing agent and a catalyst. It is an adhesive layer containing.

The adhesive tape for surface protection according to the present invention can be easily processed even at a low temperature of less than 100 ℃ through the release treatment layer using the acrylate-silicon copolymer. In addition, the release treatment layer has a residual peeling force of 90% or more, a peeling force preservation rate of 90% or more after organic solvent impregnation, and has a surface energy of 15 to 30 dyne / cm, as well as excellent surface contamination prevention characteristics. It is characterized by excellent rewinding property.

The residual peeling force means the degree that the peeling force of the tape is maintained even when the tape having high peeling force is attached to the release treatment layer and then peeled. The closer to 100%, the higher the reliability is because there is no transfer material of the release treatment layer. Can be. Generally, 80% or more is judged to be excellent, but 90% or more is required in fields requiring higher reliability.

In addition, the peel strength after impregnation of the organic solvent refers to the degree of solvent resistance of the release treatment layer, when the surface of the release treatment layer is coated with a coarse solution containing a solvent or a residual solvent in the pressure-sensitive adhesive layer on the back side of the release treatment layer It also determines stability or reliability. If the change rate of peeling force is close to 100%, it can be said that it is excellent. If it is 85% or more, it is considered that there is no problem, but more than 90% is required for higher reliability.

In addition, the surface energy is preferably 15 ~ 30 dyne / cm. Conventional silicone-based releases have lower surface energy but higher surface energy by using acrylate-silicone copolymers for coating processing at low temperatures. If the surface energy is less than 15 dyne / cm in the acrylate-silicon copolymer because the silicon content is increased a lot, the polymerization is difficult to implement, if it exceeds 30 dyne / cm in the above range because it is difficult to expect the release characteristics Most preferably.

The acrylate-silicon copolymer according to the present invention is to be cured at low temperatures while introducing a conventional silicone mold release agent is cured at a high temperature to acryl, as a result of the reliability of the coating on the low-strength unstretched polyolefin film Can increase. The acrylate-silicone copolymer of this function is 45 to 87% by weight of the acrylate monomer (A); 10 to 40% by weight of the acrylate monomer having a siloxane group (B); And it is preferable that it is a copolymer obtained by superposing | polymerizing; 3-15 weight% (C) of monomer containing a crosslinkable functional group.

As the first component constituting the acrylate-silicon copolymer, the acrylate monomer (A) functions to lower the curing temperature of the release treatment layer. In general, a release treatment layer composed of a silicon component is difficult to manufacture when the temperature of the processing coating is less than 100 degrees even using a platinum catalyst or the like. Even when the silicon release treatment layer is manufactured at less than 100 degrees, the reliability is lowered, which makes it difficult for the release treatment layer to serve as a release chamber such as the transfer of the silicon component to the pressure-sensitive adhesive layer and the peeling force increase. Such a function is not particularly limited as long as it is a monomer usually used as an acrylic adhesive, and any of aliphatic acrylate, aliphatic methacrylate, cycloaliphatic acrylate, cycloaliphatic methacrylate and the like can be used. Hereinafter, including 'acrylate' and 'methacrylate' is referred to as '(meth) acrylate'. Among the acrylates, a (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms is preferable. When the (meth) acrylate monomer having an alkyl group having 13 or more carbon atoms is used, the glass transition temperature of the monomer is low, making it difficult to polymerize into a desired copolymer. For example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) Acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (Meth) acrylate, isononyl (meth) acrylate, etc. are mentioned. These may be used alone or in combination of two or more thereof. In addition, the content of the acrylate monomer constituting the acrylate-silicon copolymer is preferably 45 to 87% by weight of the total weight of the acrylate-silicon copolymer. If the content of the acrylate monomer does not reach 45% by weight, the polymerization is difficult because the content of the acrylate monomer having a siloxane group is relatively increased. If the content of the acrylate monomer exceeds 87% by weight, the content of the acrylate monomer having a siloxane group is decreased. This is because the release characteristics cannot be exhibited.

Next, the acrylate monomer having the siloxane group as the second component constituting the acrylate-silicone copolymer is preferably a compound represented by the following formula (B).

[Formula 1]

Here, R ₁ is an alkyl group having 0 to 2 carbon atoms, R ₂ is an alkyl group having 1 to 10 carbon atoms, and m and n are each an integer of 0 to 10.

The acrylate monomer having a siloxane group of Formula 1 is prepared by using a compound having a siloxane group and a diol including R ₂ to prepare an siloxane intermediate compound represented by Formula 2 below, and having a release property in a release treatment layer, and being grafted to acrylate. To make it work.

[Formula 2]

Diols containing R ₂ include methanediol, ethanediol, (iso) propanediol, (iso) butanediol, (iso) pentanediol, (iso) hexanediol, and (iso) heptanediol And at least one diol selected from the group consisting of (iso) octanediol, (iso) nonnatatandiol, and (iso) decanediol.

Since the siloxane intermediate compound of Formula 2 cannot form a acrylate-siloxane copolymer, it is incompatible with other acrylate monomers and thus cannot stably bring a chemical reaction, thereby using acryloyl chloride containing R ₁ . An acrylate monomer having siloxane groups was allowed to synthesize. The acryloyl chloride comprising R ₁ is preferably at least one selected from the group consisting of acrylo chloride, methacryloyl chloride, etaacryloyl chloride. The acrylate monomer having the siloxane group is preferably 10 to 40% by weight of the total weight of the acrylate-silicone copolymer. If the content is less than 10% by weight, the surface energy of the substrate is hardly reduced after coating on the substrate, and thus has low peeling characteristics, and when the content exceeds 40% by weight, steric hindrance occurs due to the bulk characteristics of the siloxane groups, thereby forming polymerization. Since it becomes difficult, it is preferable to set it as said range.

Next, the monomer (C) containing the crosslinkable functional group as the third component constituting the acrylate-silicone copolymer is the same copolymer as the acrylate monomer (B) component having the acrylate monomer (A) component and the siloxane group. Form a crosslinking reaction with the curing agent to increase the durability. An acrylate monomer having one or more functional groups selected from the group consisting of hydroxy groups, carboxyl groups, epoxy groups, vinyl groups and amide groups can be used for this function. Specific examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 2-hydroxy Monomers containing a hydroxy group such as oxyethylene glycol (meth) acrylate and 2-hydroxypropylene glycol (meth) acrylate; Monomers containing a carboxyl group such as (meth) acrylic acid, maleic acid, or fumaric acid; Or monomers containing nitrogen such as acryl amide, N-vinyl pyrrolidone or N-vinyl caprolactam. These may be used alone or in combination of two or more thereof. The monomer containing the crosslinkable functional group is preferably 3 to 15% by weight of the total content of the acrylate-silicone copolymer. If the content is less than 3% by weight, there is a low probability of hardening reaction, so that the unreacted acrylate-silicone copolymer may fall off to the pressure-sensitive adhesive layer. If the content exceeds 15% by weight, the crosslinking reactivity is increased to decrease the storage stability of the pressure-sensitive adhesive. It is preferable to set it as said range, since it becomes.

The acrylate-silicon copolymer obtained as described above is prepared by mixing and curing a curing agent, and the curing agent increases the durability of the release treatment layer and prevents falling off to the pressure-sensitive adhesive layer. As the curing agent used for this purpose, one or more curing agents selected from the group consisting of isocyanate compounds, epoxy compounds, melamine resins and aziridine compounds can be used. The amount of the curing agent is preferably included in 0.5 to 10 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer.

In addition, in the configuration of the release treatment layer, only the acrylate-silicone copolymer and the curing agent are slow in the reaction rate, and there is a limit in lowering the temperature of the reaction. Therefore, there is a need for the use of a catalyst that helps the reaction of the crosslinkable functional group and the curing agent included in the copolymer. As such a catalyst, one or more from the group consisting of an amine compound, a tin compound and a non-tin compound can be used.

Specific examples of the amine compound include tertiary amines such as benzyldimethyl amine, trisdimethyl amine methylphenol, triethylene diamine and tributyl amine; Quaternary amines such as triethylbenzyl ammonium chloride and tetramethyl ammonium chloride; Imidazoles such as 2-methyl imidazole, 2-ethyl-4-methyl imidazole and 2-phenyl imidazole.

Specific examples of the tin compound include di (tri) butyl tin dichloride, dibutyl tin oxide, dibutyl tin dibromide, dibutyl tin dilaurate (DBTDL), dibutyl tin diacetate, dibutyl tin sulfide, Tributyl tin oxide, tributyl tin acetate, triethyl tin ethoxide, tributyl tin ethoxide, dioctyl tin oxide, tributyl tin chloride, tributyl tin trichloro acetate, 2-ethylhexane tin and the like.

Specific examples of the non-tin compound in the catalyst include titanium-based compounds such as dibutyl titanium dichloride, tetrabutyl titanate and butoxy titanium trichloride; Lead systems such as lead oleate and lead naphthenate; Iron-based compounds such as 2-ethylhexane iron and iron acetyl acetonato; Zinc-based compounds such as zinc naphthenate; Zirconium compounds such as zirconium naphthenate; Cobalt system, such as 2-ethylhexane cobalt, etc. are mentioned.

The above-listed catalysts may be used alone or in combination of two or more thereof, and preferably included in an amount of 0.01 to 3 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer.

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Example]

Preparation Example 1 Preparation of Acrylate-Silicone Copolymer-A

In a 1 L reactor equipped with a refrigeration system for easy reflux of nitrogen gas, 77 wt% of heptamethyltrisiloxane (HMTS) and 23 wt% of propanediol were injected into 150 wt% of toluene and 3 hours at 60 ° C. The reaction resulted in the synthesis of siloxane intermediate. 50% by weight of the obtained siloxane intermediate and 50% by weight of methacryloyl chloride were added to 150% by weight of toluene, and 30% by weight of triethylamine (TEA) was added thereto, followed by reaction at 0 ° C. for 24 hours to have a siloxane group. An acrylate monomer was obtained. A monomer mixture composed of 70% by weight of methyl methacrylate and 20% by weight of acrylate monomer having siloxane groups synthesized above and 9.95% by weight of 2-hydroxyethyl acrylate (2-HEA) was added as a polymerization initiator. Azobisisobutyronitrile (AIBN) was added 0.05 part by weight and reacted at 55 ° C. for 8 hours to synthesize an acrylate-silicon copolymer.

Preparation Example 2 Preparation of Acrylate-Silicone Copolymer-B

After adding a monomer mixture consisting of 70% by weight of methyl methacrylate, 30% by weight of the acrylate monomer having a siloxane group synthesized in Preparation Example 1, and 9.95% by weight of 2-hydroxyethyl acrylate (2-HEA) , 0.05 parts by weight of azobisisobutyronitrile (AIBN) was added thereto to prepare an acrylate-silicon copolymer in the same manner as in Preparation Example 1.

Preparation Example 3 Preparation of Acrylate-Silicone Copolymer-C

After adding the monomer mixture consisting of 85% by weight of methyl methacrylate, 5% by weight of the acrylate monomer having a siloxane group synthesized in Preparation Example 1, and 9.95% by weight of 2-hydroxyethyl acrylate (2-HEA) , 0.05 parts by weight of azobisisobutyronitrile (AIBN) was added thereto to prepare an acrylate-silicon copolymer in the same manner as in Preparation Example 1.

Preparation Example 4 Preparation of Acrylate-Silicon Copolymer-D

After adding a monomer mixture consisting of 40% by weight of methyl methacrylate, 50% by weight of the acrylate monomer having a siloxane group synthesized in Preparation Example 1, and 9.95% by weight of 2-hydroxyethyl acrylate (2-HEA) , 0.05 parts by weight of azobisisobutyronitrile (AIBN) was added thereto to prepare an acrylate-silicon copolymer in the same manner as in Preparation Example 1.

[Examples 1 to 2 and Comparative Examples 1 to 5]

According to Table 1 and Table 2, 100 parts by weight of one of the acrylate-silicon copolymers A, B, C, D, hexamethylene diisocyanatetrimethyrolpropane adduct as a curing agent (Samyoung Ink, SUR-700 curing agent) ) 3 parts by weight and 0.2 parts by weight of dibutyl tin dilaurate (DBT-DL) as a catalyst, diluted to an appropriate concentration using methyl ethyl ketone (MEK) and mixed uniformly.

In order to compare the low temperature curing characteristics of the acrylate-silicon copolymer, coating was performed using a silicone release material generally used as Comparative Example 5. Addition reaction curable silicone resin KS-S30E (Shin-Etsu Co., Ltd.) 100% by weight, catalyst CAT-PL-5000 (Shin-Etsu Co., Ltd.) 10% by weight, diluted to an appropriate concentration using a dilution solvent of toluene and hexane to A , B, C, D was prepared in the same manner as the compound.

The mixture was coated on one surface of an unstretched polypropylene film (CPP) using a Mayer bar, and then dried at 70 ° C. for 30 seconds to have a uniform thickness of 0.2 μm, thereby preparing a surface protective adhesive tape having a release treatment layer laminated thereon. .

Acrylate
-Silicone copolymer (Meth) acrylate monomer Monomer having a siloxane group Monomers with functional groups A 70 20 9.95 B 70 30 9.95 C 85 5 9.95 D 40 50 9.95

(Each copolymer equally contains 0.05% of the polymerization initiator.)

division Example Comparative example One 2 One 2 3 4 5 Acrylate-silicone copolymer A 100 100 B 100 100 C 100 D 100 SUR-700 Curing Agent 3 3 3 3 3 3 DBT-DL Catalyst 0.2 0.2 0 4 0.2 0.2 KS-S30E Silicone Resin 100 CAT-PL-5000 Catalyst 10

The physical properties of the adhesive tape were measured by the following experimental examples using the surface protective adhesive tapes according to Examples 1 to 2 and Comparative Examples 1 to 5, and the results are shown in Table 3 below.

[Experimental Example]

(1) Initial Peel Force Measurement

With respect to the tape having a release treatment layer prepared in Examples 1 to 2 and Comparative Examples 1 to 4, after attaching Nitto 31B to the coating surface of the release treatment layer prepared with a roller of 2 kg, it was left at room temperature for 1 hour. Then, it was measured using a tensile tester at 180 ° angle and 0.3 m / min peel rate (JIS Z 0237 condition applied).

(2) Peeling force measurement over time

After attaching Nitto 31B to the coated surface of the prepared release layer with a roller of 2 kg, heat treatment at room temperature for 1 hour at 100 ° C. for 30 minutes, and after 1 hour at room temperature, 180 ° angle and 0.3 m / min peel rate It was measured using a tensile tester (JIS Z 0237 conditions apply).

(3) measuring residual peeling force

After attaching the Nitto 31B to the coated surface of the prepared release layer with a roller of 2 kg, after 30 minutes at room temperature, peeled off the Nitto 31B and attached to the untreated PET film with a roller of 2 kg, release treatment Nitto 31B, which is not attached to the surface, was attached to an untreated PET film with a roller of 2 kg, and compared to the peel force measured by Equation 1 below. In general, if it is maintained at 90% or more, it can be said that little transfer occurs in the release layer.

[Equation 1]

Residual Peeling Force (%) = (Peeling Force A / Peel Force B) X 100

(In the above, the peeling force A is the peeling force on the untreated PET surface of Nitto 31B adhered to the coated surface of the manufactured release layer, and the peeling force B is the peeling force on the untreated PET surface of Nitto 31B.)

(4) Measurement of peeling force retention after organic solvent impregnation

The film having a release treatment layer prepared was impregnated with an organic solvent for 3 minutes and then dried at room temperature using wind. After attaching Nitto 31B to the coated surface of the release treatment layer of this film with a roller of 2 kg, it was left at room temperature for 1 hour, and then measured using a tensile tester at 180 ° angle and 0.3 m / min peel rate. Peel force was compared before and after the organic solvent impregnation through 2. As the organic solvent used in the evaluation, two kinds of methyl ethyl ketone (MEK), which is frequently used as a pressure-sensitive adhesive liquid in polar solvents, and toluene (Tol), which are frequently used in nonpolar solvents, were used.

[Equation 2]

Peel force retention rate (%) = (peel force F / peel force f) X 100

(In the above, the peel force F is the peel force of the tape after the organic solvent impregnation and the peel force f is the peel force of the tape before the organic solvent impregnation.)

(5) Surface energy measurement

On the coated surface of the release layer, the contact angle was measured using hydrophilic solvent water (H2O) and hydrophobic solvent diiomethane (CH ₂ I ₂ ) using the WO method, and surface energy was measured using the young-dupre equation. Was measured.

(6) water contact angle measurement

The contact angle of water (H ₂ O) on the coating surface of the prepared release layer was measured. In general, the lower the surface energy, the larger the water contact angle is measured, and foreign matters do not adhere well.

division Initial Peel Force [gf / 25㎜] Peeling force over time [gf / 25㎜] Residual peeling force
[%] Peel force retention rate [%] Surface energy
[dyne / cm] water
Contact angle MEK Tol Example 1 23.2 30.1 93.2 94.5 96.2 23.5 106 Example 2 20.1 27.8 91.5 93.4 95.1 20.2 109 Comparative Example 1 25.3 32.1 73.2 72.4 65.3 22.7 106 Comparative Example 2 12.7 530.2 92.7 98.2 97.5 19.8 110 Comparative Example 3 266.8 423.2 96.5 98.6 98.1 32.1 87 Comparative Example 4 13.2 19.5 66.3 63.8 55.3 18.6 111 Comparative Example 5 3.3 5.2 5.7 57.4 32.1 17.2 111

As can be seen in Table 3, to obtain an acrylate-silicon copolymer prepared using a monomer having 20% by weight and 30% by weight of siloxane groups, by using this to prepare a pressure-sensitive adhesive tape laminated layer Case (Examples 1 and 2) It can be seen that not only the initial peeling force, the aging peeling time, the residual peeling force, and the peeling force are all excellent, but also the surface energy characteristics are excellent. However, when the siloxane group content was as low as 5% by weight as in Comparative Example 3 or excessively as 50% by weight as in Comparative Example 4, the desired level of initial and aging peeling strength could not be obtained.

On the other hand, the amount of the catalyst used is 0.2 parts by weight of the total composition is appropriate, the residual peeling force and peeling force retention rate is too low if the catalyst is not used as in Comparative Example 1, even when excessive use of the catalyst as in Comparative Example 2 It can be confirmed that the force is too high to be undesirable.

In addition, when the coating at the same temperature of 70 ℃ in general silicone release resin it can be seen that the residual peeling force and the peeling force preservation rate is greatly lowered hardly occurs.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims.

The adhesive tape for surface protection according to the present invention is an optical film or optical sheet constituting a liquid crystal display, a plasma display, an organic EL (electroluminescence), a field emission display, or the like, or a home appliance such as a mobile, a refrigerator, a washing machine, an air conditioner, or the like. It can be used for protecting the surface of intermediate materials and finished products.

Claims (10)

In the adhesive tape for surface protection,
As an adhesive tape for surface protection which an adhesive layer and the mold release process layer are laminated | stacked on one surface of the polyolefin film base material layer,
The release layer is a pressure-sensitive adhesive layer, characterized in that the pressure-sensitive adhesive layer comprising an acrylate-silicon copolymer, a curing agent and a catalyst. The method of claim 1,
The release treatment layer has a residual peeling force of 90% or more, a peeling force retention rate of 90% or more after the organic solvent impregnation, surface energy is characterized in that 15 ~ 30 dyne / cm, adhesive tape for surface protection. The method of claim 1,
The acrylate-silicone copolymer is 45 to 87% by weight of the acrylate monomer; It is a copolymer obtained by superposing | polymerizing 10-40 weight% of acrylate monomers which have a siloxane group, and 3-15 weight% of monomers containing a crosslinkable functional group, The adhesive tape for surface protections. The method of claim 3,
The acrylate monomer is a (meth) acrylate having an alkyl group having 1 to 12 carbon atoms, the adhesive tape for surface protection. The method of claim 3,
The acrylate monomer having the siloxane group is a compound represented by the following formula (1),
[Formula 1]

R ₁ is an alkyl group having 0 to 2 carbon atoms, and R ₂ is an alkyl group having 1 to 10 carbon atoms; m and n are integers of 0-10, respectively, The adhesive tape for surface protections. The method of claim 3,
The monomer containing a crosslinkable functional group is an acrylate monomer having at least one functional group selected from the group consisting of a hydroxy group, a carboxyl group, an epoxy group, a vinyl group and an amide group. The method of claim 1,
The curing agent is one or more selected from the group consisting of an isocyanate compound, an epoxy compound, a melamine-based resin and an aziridine-based compound, adhesive tape for surface protection. The method of claim 1,
The amount of the curing agent is 0.5 to 10 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer, the surface protection adhesive tape. The method of claim 1,
The catalyst is an adhesive tape for surface protection, characterized in that at least one member from the group consisting of amine compound, tin compound and non-tin compound. The method according to any one of claims 1 to 9,
The content of the catalyst is 0.01 to 3 parts by weight based on 100 parts by weight of the acrylate-silicon copolymer, the surface protection adhesive tape.