JP2000218204A - Masking tape or sheet for coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a masking tape or sheet for coating, which is free from breaking or tearing on the way to be stripped from a body to be stuck even in a self-adhesive tape or sheet using a porous base material. SOLUTION: The masking tape or sheet for coating is a tape or sheet having an adhesive agent layer formed on one surface of the porous base material, the adhesive layer is composed of a water dispersion type adhesive, and the air permeability of the porous base material is 10-36000 sec/100 ml, and the masking tape or sheet has a feature of decreasing the tacky power for pasting the body to be stuck due to the spraying of a coating material. The adhesive layer may be constituted of an acrylic adhesive. The gel fraction of the adhesive is, for example, >=30 wt.%. The tacky power for pasting the body to be stuck after spraying is, for example, 1.7-4.4 N/18 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masking tape or sheet for painting, and more particularly to a masking tape or sheet used for painting an automobile or the like, and more particularly, to a masking tape or sheet for surely following the surface of a target adherend. The present invention relates to a masking tape or sheet for painting that can be stuck and attached, and can be peeled off cleanly without breaking or tearing when it is no longer needed.

[0002]

2. Description of the Related Art Conventionally, as an adhesive tape used for so-called masking applications, which is peeled off at the end of application after pasting, a tape using a plastic such as a vinyl chloride resin or polyester as a base material, Japanese paper / crepe paper as a base material, etc. Tapes using porous paper materials are widely used.

[0003] Among them, those using a porous paper material such as Japanese paper as a base material are widely used because tapes can be cut by hand, workability is good, and they are relatively inexpensive. ing. Adhesive tapes made of this porous paper material are generally made by mixing beaten wood pulp with hemp and synthetic staple fibers to form a porous paper material, appropriately adjusting the strength and elongation of the paper material, impregnating and separating. It is manufactured by applying a pressure-sensitive adhesive to the surface after performing a mold treatment. However, with such an adhesive tape, the tensile strength, end tear strength, elongation, etc., are smaller than those of an adhesive tape using a plastic substrate, and when the tape is peeled off, the tape breaks or tears in the middle. Had occurred. This phenomenon is considered to be due to the fact that the adhesive force increases due to the forced heating during the coating process and a greater load is applied to the substrate.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent an adhesive tape or sheet using a porous substrate from being cut or torn midway when peeled from an adherend. An object of the present invention is to provide a masking tape or sheet for painting.

[0005]

Means for Solving the Problems In order to achieve the above object, the inventors of the present invention have repeatedly studied focusing on the adhesive force after spraying paint, and as a result, the adhesive having the property of reducing the adhesive force by spraying paint. The present inventors have found that the use of a tape or a sheet can facilitate the operation of peeling the tape or the sheet after the painting step, and have completed the present invention.

That is, the present invention relates to a coating masking tape or sheet having a pressure-sensitive adhesive layer formed on one surface of a porous substrate, wherein the pressure-sensitive adhesive layer comprises a water-dispersed pressure-sensitive adhesive, Provided is a masking tape or sheet for coating having a property that the air permeability of a conductive base material is 10 to 36000 seconds / 100 ml and the adhesive strength to adhere to an adherend is reduced by spraying a paint.

The pressure-sensitive adhesive layer may be composed of an acrylic pressure-sensitive adhesive. The gel fraction of the adhesive is, for example, 30.
% By weight or more. The adherence to the adherend after spraying the paint is, for example, in the range of 1.7 to 4.4 / 18 mm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The porous substrate used in the present invention has an air permeability of 10 to 10 as measured by the method described later.
It is necessary to be 36000 seconds / 100 ml. The air permeability is preferably 30 to 35000 sec / 100m
1, more preferably about 50 to 30,000 seconds / 10 ml. When the air permeability is less than 10 seconds / 100 ml, when applying the water-dispersed pressure-sensitive adhesive to a porous substrate, the pressure-sensitive adhesive solution passes through the substrate layer and moves to the back side of the substrate, so-called, A strikethrough phenomenon is likely to occur, which is not preferable. On the other hand, if the air permeability exceeds 36000 sec / 100 ml, the effect of lowering the adhesion to the adherend by spraying the paint, which is the object of the present invention, cannot be exhibited, which is not preferable. In the present invention,
The air permeability of the porous substrate is a value measured using a Gurley standard densometer (type B) according to JIS P-8117.

The material and the like of the porous substrate are not particularly limited as long as they have air permeability in the above specified range.
For example, a porous paper material made of a fibrous substance such as kraft paper, crepe paper, and Japanese paper may be used. Among them, general-purpose Japanese paper is preferable.

As the Japanese paper, beaten wood pulp or one obtained by mixing one or more kinds of synthetic short fibers with the pulp is used. Examples of the material of the synthetic short fiber include vinylon, nylon, polyester, polypropylene, polyvinyl chloride and the like.

In order to adjust the air permeability of the porous substrate to the above specific range, for example, means for producing the porous substrate include the basis weight, thickness, papermaking method, fiber density, and the like of the porous substrate. (Fiber entanglement) and means for adjusting the type and amount of the binder component for bonding the fibers to each other can be employed. Further, as a means for adjusting the air permeability to the range of the present invention by a post-treatment after the production of the porous substrate, various post-treatments such as back sizing treatment, back surface treatment, and undercoating treatment are performed on the porous substrate surface. There is a means to adjust by.

Although the basis weight of the porous substrate is not particularly limited,
Usually 20 to 100 g / m ² , preferably 25 to 50 g / m ²
m ² . The thickness of the porous substrate varies depending on the purpose of use and the like.
μm is preferred, and more preferably 50 to 100 μm.

Among the means for adjusting the air permeability by the post-treatment after the production of the porous substrate, the back-size treatment and the back treatment are performed on the surface of the porous substrate opposite to the surface on which the pressure-sensitive adhesive layer is formed (pressure-sensitive adhesive). This is a process performed on the surface on which the layer is not formed. As the back sizing agent used in the back sizing treatment, a vinyl acetate resin, an acrylic resin, a styrene-butadiene rubber (SBR) resin, or the like can be used. Further, as a back surface treatment agent used for the back surface treatment, a long-chain alkyl-based release agent, a silicone-based release agent, or the like can be used.
On the other hand, the undercoating treatment is provided on the side of the porous substrate on which the pressure-sensitive adhesive layer is formed to improve the adhesion (anchoring property) between the porous substrate and the pressure-sensitive adhesive layer, and is used for the undercoating treatment. Acrylic, rubber, urethane, epoxy, and other resins can be used as the undercoating agent. The back sizing treatment, the back surface treatment, and the undercoating treatment are performed by applying the treatment agent solution to the surface of the porous base material and drying. At this time, the air permeability required in the present invention is adjusted by adjusting the type, application amount, application method and the like of the treatment agent. In the present invention, when the post-treatment is performed on the porous substrate, the porous substrate after the treatment needs to satisfy the air permeability required in the present invention. .

In the masking tape or sheet for coating of the present invention, a water-dispersed pressure-sensitive adhesive layer is provided on one surface of the porous substrate. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited as long as it is a water-dispersed type, and examples thereof include acrylic and rubber-based pressure-sensitive adhesives. Among them, acrylic pressure-sensitive adhesives are preferred because they are excellent in heat resistance and weather resistance.

The acrylic pressure-sensitive adhesive is often made of an acrylic ester copolymer. The main monomer constituting the acrylate copolymer is usually an alkyl (meth) acrylate having an alkyl group of 4 to 12 carbon atoms, and specifically, butyl acrylate, 2-ethylhexyl acrylate, acrylic Isononyl acrylate, lauryl acrylate, butyl methacrylate, lauryl methacrylate and the like. One or more of these alkyl esters are used. These alkyl esters are generally used in a proportion of 50% by weight or more in the monomer mixture. If the amount is less than this, it becomes difficult to obtain good tackiness.

In the acrylate copolymer, a functional monomer can be copolymerized with the above-mentioned main monomer in order to improve adhesion to an adherend. As the functional monomer, a carboxyl group-containing monomer,
Examples include a hydroxyl group-containing monomer, an epoxy group-containing monomer, an amino group-containing monomer, a mercapto group-containing monomer, an isocyanate group-containing monomer, and more specifically, acrylic acid, methacrylic acid, itaconic acid, maleic anhydride, crotonic acid, Maleic acid, fumaric acid, (meth)
Hydroxyalkyl acrylate, glycerin dimethacrylate, glycidyl (meth) acrylate, methyl glycidyl methacrylate, aminoethyl (meth) acrylate,
There are 2-methacryloyloxyethyl isocyanate and the like, and it is also possible to introduce a mercapto group at the terminal of the chain transfer agent as a functional group. Among these functional monomers, a carboxyl group-containing monomer is preferable in terms of reactivity and versatility, and more preferably, acrylic acid and methacrylic acid.

The content of the functional monomer unit is about 1 to 10 parts by weight, preferably about 1 to 4 parts by weight, based on 100 parts by weight of the acrylate copolymer. When the content of the functional monomer unit is less than 1 part by weight, it is difficult to obtain good adhesion, and when the content is more than 10 parts by weight, the unwinding force tends to increase.

The acrylate copolymer may contain, as necessary, other copolymerizable monomers as constituent monomers in addition to the main monomer and the functional monomer. Such copolymerizable monomers include, for example, alkyl (meth) acrylates having an alkyl group having 1 to 3 carbon atoms, such as methyl methacrylate, ethyl acrylate, and isopropyl acrylate; tridecyl methacrylate, (meth) Alkyl (meth) acrylate having 13 to 18 carbon atoms in the alkyl group such as stearyl acrylate; triethylene glycol diacrylate;
Polyfunctional monomers such as ethylene glycol dimethacrylate and trimethylolpropane tri (meth) acrylate; vinyl acetate, styrene, (meth) acrylonitrile, n-vinylpyrrolidone, (meth) acryloylmorpholine, cyclohexylmaleimide, isopropylmaleimide, and (meth) acrylamide And so on.

The acrylate copolymer can be synthesized from the above monomer mixture by a general polymerization method, for example, an emulsion polymerization method, by general batch polymerization, continuous drop polymerization, divided drop polymerization, or the like. . The polymerization temperature is, for example, 3
The range is from 0 to 80 ° C.

Examples of the polymerization initiator include, for example, 2,2'-
Azobisisobutyronitrile, 2,2'-azobis (2
-Amidinopropane) dihydrochloride, 2,2'-
Azobis (N, N'-dimethyleneisobutylamidine)
Azo polymerization initiators such as; persulfates such as potassium persulfate and ammonium persulfate; benzoyl peroxide;
peroxide polymerization initiators such as t-butyl hydroperoxide; and redox polymerization initiators such as persulfate and sodium bisulfite.

Examples of the emulsifier include anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate; polyoxyethylene alkyl ether, polyoxyethylene Nonionic emulsifiers such as ethylene alkyl phenyl ether and the like can be mentioned, and one or more of these are used. In both the anionic and nonionic types, a radical polymerizable emulsifier into which a propenyl group or the like is introduced may be used. These emulsifiers have an adhesive solid content of 1
0.3 to 10 parts by weight, preferably 0.1 to 100 parts by weight.
It is preferred to mix in the range of 5 to 9 parts by weight. If the compounding amount of the emulsifier is less than 0.3 parts by weight, the polymerization stability may be deteriorated. Adhesive residue or contamination may occur on the body surface. It is not necessary to use the entire amount of the emulsifier during the polymerization, and a part of the emulsifier may be added later to the pressure-sensitive adhesive solution after the polymerization.

In the present invention, the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is preferably 30% by weight or more, more preferably 40 to 40%, in order to suppress an increase in adhesive force due to heating in the coating step. It is about 95% by weight. Gel fraction 3
If the amount is less than 0% by weight, the adhesive strength tends to increase, and the adhesive tends to remain when peeled. On the other hand, when the gel fraction exceeds 95% by weight, the adhesive strength is reduced, and the gel tends to peel off during the operation.
Here, the gel fraction refers to a pressure-sensitive adhesive (polymer) having a dry weight of W ₁ (g) in toluene at room temperature (for example, 20 g).
C.) for 7 days, taken out and dried, and the weight calculated from the following formula is defined as W ₂ (g).

Gel fraction (% by weight) = (W ₂ / W ₁ ) × 100 More specifically, the gel fraction is determined by the following method.
That is, an aqueous dispersion of the pressure-sensitive adhesive is applied onto the release-treated film, dried at 130 ° C. for 5 minutes, and a certain amount of the obtained polymer is collected (W ₁ g). Next, the polymer was wrapped with a Teflon membrane having a pore size of 0.2 μm, the mouth was tied up with a kite string, and left at room temperature in toluene for 7 days to elute the sol component.
The Teflon film containing the gel is dried at 130 ° C. for 2 hours, and the weight of the gel is measured (W ₂ g). The above W ₁ and W ₂
Is substituted into the above equation to determine the gel fraction.

The gel fraction of the pressure-sensitive adhesive is determined, for example, by the type and ratio of the monomers constituting the pressure-sensitive adhesive, the type and amount of the polymerization initiator,
It can be adjusted by appropriately selecting the polymerization conditions such as the reaction temperature and the type and amount of the crosslinking agent.

The pressure-sensitive adhesive layer contains various additives as required, for example, a tackifier, a cross-linking agent, a plasticizer, a softener, a filler, a pigment, a dye, an antioxidant, and a stabilizer. May be.

The thickness of the pressure-sensitive adhesive layer can be appropriately selected within a range that does not impair the handleability and the like.
m, more preferably about 15 to 40 μm.

The coating masking tape or sheet of the present invention can be produced according to a usual method for producing an adhesive tape. For example, an undercoating treatment is performed on one surface of the porous substrate, a backsize treatment and / or a back surface treatment is performed on the other surface, and the surface on which the undercoating treatment has been performed contains an adhesive and, if necessary, the additive. It can be produced by directly applying the aqueous dispersion, drying it, and cutting it into an appropriate size or width as needed. Further, it can also be produced by a method in which an aqueous dispersion containing the pressure-sensitive adhesive or the like is coated on a separator, dried, and then transferred to one surface of the substrate. The aqueous dispersion containing the pressure-sensitive adhesive or the like can be prepared, for example, by adding the above-mentioned additives to the pressure-sensitive adhesive composition obtained by emulsion polymerization, if necessary. The aqueous dispersion can also be prepared by dispersing the pressure-sensitive adhesive (polymer) obtained by a polymerization method other than emulsion polymerization and, if necessary, the above-mentioned additive in water using an emulsifier.

An important feature of the present invention is the property that the adhesion to the adherend is reduced by spraying the paint, that is, the adhesive strength to adhere to the adherend when the paint is sprayed is reduced when the paint is not sprayed. It is characterized in that it has a characteristic of being smaller than the adhesive strength for attaching to an adherend. For example, in the masking tape or sheet for coating of the present invention, a paint is sprayed while being adhered to an adherend and a predetermined condition (for example, 100
C. × 1 hour) is smaller than the adhesive strength when heat-treated under the same conditions as described above without sticking to the adherend and spraying paint. Such characteristics can be obtained by providing a water-dispersed pressure-sensitive adhesive layer on the surface of a porous substrate having a specific air permeability, but the details of the mechanism are not clear. Since the masking tape or sheet for coating of the present invention has the above-mentioned characteristics, the tape or sheet is not cut or torn at the time of re-peeling after the coating step, and the work can be performed smoothly.

Normally, a certain amount of adhesive force is required to adhere well to an adherend or to follow it well. When only bonding is considered, the absolute value of the adhesive force does not exceed a large value, but it is designed so that the adhesive force is within a certain range due to the balance with the strength of the base material etc. Is preferred.

The initial adhesive strength of the coating masking tape or sheet of the present invention is preferably 1.5 N / 18 mm or more. If the initial adhesive strength is less than 1.5 N / 18 mm, the tape or sheet is likely to be peeled off from the adherend, and the mist of the paint is likely to penetrate from the edge of the tape or sheet. In the present invention, the initial adhesive strength refers to a polyester-melamine-based paint applied as an adherend, a pressure-sensitive adhesive tape cut to a width of 18 mm, adhered to a dried melamine coated plate by reciprocating a 2 kg roller once at 100 ° C. After heating for 1 hour at room temperature, and then allowed to cool at room temperature, a peeling force (N / 18 mm) obtained by performing a 180 ° peel test at a tensile speed of 300 mm / min using a tensile tester.

Further, the adhesive strength at the time of re-peeling (adhesive strength to adhere to an adherend after spraying paint) is preferably 9.8 N / 18 mm or less in order to prevent the substrate from being broken. Further, from the viewpoint of workability, the adhesive strength at the time of re-peeling is more preferably 4.9 N / 18 mm or less, and particularly preferably 1.
The range is 7 to 4.4 N / 18 mm. By adjusting the adhesive strength at the time of re-peeling within the above range, it is possible to secure workability under a wide range of working conditions such as manual peeling and mechanical peeling. In the present invention, the adhesive strength at the time of re-peeling (adhesive adherence after paint spraying) refers to a polyester-melamine-based paint applied as an adherend, cut into a dried melamine-coated plate to a width of 18 mm. After the adhesive tape was adhered by reciprocating a 2 kg roller once, the paint was sprayed on the adhesive tape, heated at 100 ° C. for 1 hour, allowed to cool at room temperature, and then pulled using a tensile tester. It is a value of a peeling force (N / 18 mm) obtained by performing a 180 ° peel test at a speed of 300 mm / min.

The adhesive strength can be adjusted by appropriately selecting, for example, the type and ratio of the monomer components constituting the adhesive, the type and amount of the polymerization initiator, the polymerization temperature and the polymerization time, and the type and amount of the crosslinking agent. .

The masking tape or sheet of the present invention can be applied to both coating using a water-based coating and coating using an oil-based coating.

[0034]

According to the present invention, the pressure-sensitive adhesive layer is made of a water-dispersed pressure-sensitive adhesive and uses a porous base material having a specific air permeability, and the adhesion to the adherend is reduced by spraying paint. As it has the property of deteriorating, it can be adhered to the surface of the adherend without fail, and even when using a porous substrate, it can be peeled off cleanly without breaking or tearing when peeling be able to.

[0035]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples. In the following examples, “parts” means “parts by weight”.

Example 1 A reactor equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser was charged with 50 parts of water and 0.2 parts of potassium persulfate, and was purged with nitrogen for 1 hour with stirring. Here, acrylic acid 2
A mixture of 97 parts of ethylhexyl, 3 parts of acrylic acid, 2 parts of sodium lauryl sulfate and 1 part of polyoxyethylene lauryl ether emulsified with 150 parts of water was added dropwise at 70 ° C. over 3 hours, followed by aging at 70 ° C. for 2 hours. Was. Thereafter, the mixture was cooled to room temperature and neutralized with 10% aqueous ammonia to obtain a copolymer emulsion. 0.1 part of an epoxy-based crosslinking agent was added to 100 parts of the solid content of the copolymer emulsion and mixed well to prepare an aqueous dispersion of an adhesive. The gel fraction of this pressure-sensitive adhesive was 55% by weight. An acrylic backsize agent (trade name: AE318, manufactured by Nippon Synthetic Rubber Co., Ltd.) is applied to one side of Japanese paper having a basis weight of 30 g / m ² , and dried at 130 ° C. for 3 minutes.
to form a backsize layer of m ^2. The air permeability of the porous substrate subjected to this backsize treatment was 50 seconds / 100 ml. The above aqueous dispersion of the pressure-sensitive adhesive was applied to the opposite side of the Japanese paper on which the back size layer was formed, and was applied in a hot air dryer at 130 ° C. for 3 hours.
Drying treatment for 20 minutes to form an adhesive layer having a thickness of 20 μm, and a masking tape for coating of the present invention (adhesive tape A)
Was prepared.

Example 2 After the Japanese paper used in Example 1 was subjected to a backsize treatment under the same conditions as in Example 1, an aqueous urethane resin (trade name: Adecabon Titer HUX-260, manufactured by Asahi Denka Kogyo Co., Ltd.), dried at 130 ° C. for 3 minutes, and coated at 5 g / m ^2.
Undercoat layer was formed. The air permeability of the porous substrate that has been subjected to the backsize treatment and the undercoat treatment is 30,000 seconds / 1.
It was 00 ml. The same adhesive as in Example 1 was applied to the undercoat layer side of the porous substrate, and dried in a hot air drier at 130 ° C. for 3 minutes to form an adhesive layer having a thickness of 20 μm. Masking Tape for Painting (Adhesive Tape B)
Was prepared.

Comparative Example 1 A porous substrate (back air permeability) obtained by back-sizing an adhesive solution obtained by adding 20 parts of a rosin-based tackifier to 100 parts of a natural rubber-based adhesive dissolved in toluene as in Example 1 50 seconds / 100 ml) and put in a hot air drier
The coating was dried at 3 ° C. for 3 minutes to form an adhesive layer having a thickness of 20 μm, and a masking tape for coating (adhesive tape C) was produced. The gel fraction of this pressure-sensitive adhesive was 5% by weight.

Comparative Example 2 An acrylic backsize agent (trade name: AE318, manufactured by Nippon Synthetic Rubber Co., Ltd.) was applied at a coating amount of 2 g / m ² to form a backsize layer to form a porous substrate (air permeability 9). Sec / 100m
A masking tape for coating (adhesive tape D) was produced in the same manner as in Example 1 except that l) was produced. In this pressure-sensitive adhesive tape, when the water-dispersed pressure-sensitive adhesive was applied to the porous base material, the pressure-sensitive adhesive penetrated the porous base material and slipped through to the back surface (the surface on which the back size layer was formed).

COMPARATIVE EXAMPLE 3 An acrylic backsize agent (trade name: AE318, manufactured by Nippon Synthetic Rubber Co., Ltd.) was applied at a coating amount of 10 g / m ² to form a backsize layer, and an undercoating agent (Adekabon Titer HUX) was further formed. -260, manufactured by Asahi Denka Kogyo Co., Ltd.) with a coating amount of 10 g / m ² to form an undercoat layer to produce a porous base material, except that a porous masking tape was prepared in the same manner as in Example 2. E) was prepared. The air permeability of the porous substrate was 38000 sec / 100 ml.

Experimental Example 1 An adhesive tape A cut to an 18 mm width was adhered to a melamine coated plate by reciprocating once with a 2 kg roller.
After heating for a period of time and cooling, a 180 ° peel test was performed (tensile speed: 300 mm / min), and the peeling force (N / 18 mm) was measured. The adhesive tape A cut to a width of 18 mm was adhered to a melamine coated plate by reciprocating with a 2 kg roller once, heated at 100 ° C. for 1 hour, allowed to cool, and then subjected to a high-speed peeling tester (tensile speed: 30 m / min). The tape was peeled off, and the tearability of the tape was visually observed. The case where the tape did not tear was evaluated as “「 ”, and the case where the tape was torn was evaluated as“ X ”.

Experimental Example 2 Peeling force and tearing property were measured in the same manner as in Experimental Example 1 except that the adhesive tape A was adhered to a melamine coated plate, sprayed with an aqueous paint, and then heated at 100 ° C. for 1 hour. ,
evaluated.

Experimental Example 3 The peeling force and tearing property were measured in the same manner as in Experimental Example 1 except that the adhesive tape A was bonded to the melamine coated plate, then the oil-based paint was sprayed, and then heated at 100 ° C. for 1 hour. ,
evaluated.

Experimental Example 4 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 1 except that the adhesive tape B was used instead of the adhesive tape A.

Experimental Example 5 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 2 except that the adhesive tape B was used instead of the adhesive tape A.

Experimental Example 6 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 3 except that the adhesive tape B was used instead of the adhesive tape A.

Experimental Example 7 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 1 except that the adhesive tape C was used instead of the adhesive tape A.

Experimental Example 8 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 2 except that the adhesive tape A was replaced with the adhesive tape C.

Experimental Example 9 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 3 except that the adhesive tape C was used instead of the adhesive tape A.

Experimental Example 10 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 1 except that the adhesive tape D was used instead of the adhesive tape A.

Experimental Example 11 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 2 except that the adhesive tape D was used instead of the adhesive tape A.

Experimental Example 12 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 3 except that the adhesive tape D was used instead of the adhesive tape A.

Experimental Example 13 The peeling force and tearing property were measured and evaluated in the same manner as in Experimental Example 1 except that the adhesive tape E was used instead of the adhesive tape A.

Experimental Example 14 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 2 except that the adhesive tape E was used instead of the adhesive tape A.

Experimental Example 15 The peeling force and tearability were measured and evaluated in the same manner as in Experimental Example 3 except that the adhesive tape E was used instead of the adhesive tape A.

Table 1 shows the results of the above experimental examples.

[Table 1] From Table 1, it can be seen that in the tapes of Examples, the adhesive strength when spraying paint is clearly lower than the adhesive strength when spraying paint is not performed, the tearing property is good, and the workability at the time of re-peeling is excellent. Understand.

Claims (4)

[Claims] 1. A coating masking tape or sheet having a pressure-sensitive adhesive layer formed on one surface of a porous substrate, wherein the pressure-sensitive adhesive layer comprises a water-dispersed pressure-sensitive adhesive, and A masking tape or sheet for coating having an air permeability of 10 to 36000 sec / 100 ml and having a property of reducing the adhesive strength for applying to an adherend by spraying paint. 2. The masking tape or sheet for coating according to claim 1, wherein the pressure-sensitive adhesive layer comprises an acrylic pressure-sensitive adhesive. 3. The masking tape or sheet for coating according to claim 1, wherein the gel fraction of the pressure-sensitive adhesive is 30% by weight or more. 4. The adhesive strength for adhering to an adherend after spraying paint is 1.7 to 4.4 N / 18 mm.
4. The coating masking tape or sheet according to any one of the above items 3.