JPH05317767A - Masking tape or sheet for coating - Google Patents

Abstract

PURPOSE:To finish a beautiful and sharp parting line even on a bonding face with a curved section or large recesses and projections at the time of coating by forming an adhesive layer on one face of a substrate of a copolymer of olefins and unsaturated carboxylic acid or vinyl monomer or a neutralized material of the above copolymer. CONSTITUTION:A masking tape or sheet for coating is provided by forming an adhesive layer 4 on one face of a substrate 5 of a copolymer of olefins and unsaturated carboxylic acid, a copolymer of olefins and vinyl monomer, or a neutralized material of these copolymers. The masking tape or sheet for coating is flexible and can be applied in compliance with the kind of a face to be bonded and can follow the face to be bonded firmly even if the temperature is varied, and a sharp parting line is formed. Also a plasticizer or the like is not used therein, and the face to be bonded is not modified or the cohesive power is not lowered.

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, which is particularly useful for line drawing (parting line) during painting work on a curved surface such as a bumper of an automobile or a tank of a motorcycle. Regarding tape or sheet.

[0002]

2. Description of the Related Art Conventionally, masking tapes for line-out are used at color boundaries when coating automobiles and the like, and the support for those tapes is
Polyethylene terephthalate, Japanese paper, crepe, polyvinyl chloride, polyethylene, etc. are used. that time,
If the surface to be adhered is smooth (flat) and horizontal, the tape using the support will not cause any problem, but for the adhered surface that is curved or uneven like a bumper of a car or a tank of a motorcycle, The target parting line will not be obtained unless a tape using a flexible support such as crepe, polyvinyl chloride, or polyethylene is used (Act.
No. 7370, and Japanese Utility Model Laid-Open No. 62-17372).

However, the crepe-supporting tape does not show a sharp parting line, and in the case of polyvinyl chloride-supporting tape, the plasticizer in the support migrates to the adhesive to agglomerate the adhesive. That the adhesiveness deteriorates or the plasticizer migrates to the adhered surface to change the quality of the adhered surface and that the solvent in the sprayed paint swells the support and the finished parting line does not appear sharply. There is a problem. Further, when polyethylene is used as the support, there is a problem that the dimension in the width direction of the tape is apt to change due to the tension when the tape is attached (necking phenomenon), and a sharp parting line cannot be obtained.

Therefore, an object of the present invention is to provide a masking tape or sheet for painting which can provide a sharp parting line even on an adherend having a curved or uneven surface such as a bumper of an automobile or a tank of a motorcycle. Is to provide.

[0005]

The present inventors have achieved the present invention as a result of extensive studies to solve the above problems. That is, the present invention is a copolymer of olefins and unsaturated carboxylic acid, a copolymer of olefins and other vinyl monomers, or one side of a support made of a neutralized product of these copolymers, an adhesive A masking tape or sheet for coating, which is provided with layers. Further, the present invention is a masking tape or sheet for coating, wherein the support is further laminated with a thermoplastic resin layer,
A masking tape or sheet for coating wherein the 10% modulus at 23 ° C. × 65% RH of the support is 0.3 to 4.0 kg / mm ² .

This coating masking tape or sheet for coating is flexible and can be attached according to the surface to be adhered. It adheres well to the surface to be adhered even if the temperature changes and a sharp parting line is obtained. It is what is done. Further, since no plasticizer or the like is used, the surface to be adhered is not deteriorated and the cohesiveness of the pressure-sensitive adhesive is not reduced.

The support used in the present invention is a copolymer of an olefin and an unsaturated carboxylic acid, a copolymer of an olefin and another vinyl monomer, or a copolymer of an olefin and an unsaturated carboxylic acid. A neutralized product or a neutralized product of a copolymer of an olefin and another vinyl monomer.

The olefins in the present invention means an aliphatic unsaturated hydrocarbon having one or more double bonds in the molecule, and those having 2 to 4 carbon atoms are preferable, and specifically, ethylene, propylene and butene are preferable. , Butadiene, etc.,
Ethylene and butadiene are preferable.

The unsaturated carboxylic acid in the present invention means an unsaturated carboxylic acid and its ester, and preferred examples thereof include acrylic acid, methacrylic acid, maleic acid, and their mono- or diesters.

As the vinyl monomer in the present invention,
Examples thereof include vinyl acetate, vinyl ether, acrylonitrile, acrylamide and the like.

In the copolymer of olefins and unsaturated carboxylic acid, the unsaturated carboxylic acid is usually contained in an amount of 1 to 50 in total.
%, Preferably 5 to 30% by weight. In the copolymer of olefins and other vinyl monomers, the vinyl monomer is usually contained in an amount of 1 to 30% by weight, preferably 3 to 20% by weight based on the total weight. The copolymer used in the present invention can be obtained by a method known per se.

Neutralized products of the above-mentioned copolymers of olefins and unsaturated carboxylic acids, or copolymers of olefins and other vinyl monomers (of which have acidic groups)
The neutralized product of is also produced by a means known per se. Examples of the reagent used for the neutralization treatment include alkali metals, alkaline earth metals, zinc, and organic bases (for example, ammonium, sulfonate, sulfanate, amine) and the like.

A neutralized product of the copolymer of the olefin and the unsaturated carboxylic acid, or a copolymer of the olefin and another vinyl monomer (of which has an acidic group)
Specific examples of the neutralized product include ethylene-methacrylic acid copolymer metal ion crosslinked resins (Mitsui DuPont Polychemical Co., Ltd., Himilan; DuPont Co., Ltd., Surlyn), butadiene-acrylic acid copolymers. Metal ion cross-linking resin (BF Goodrich Co., Ltd., Hiker), metal ion cross-linking resin of ethylene-methyl acrylate-ethyl hydrogen maleate terpolymer (DuPont Co., Va
mac), carboxylated NBR (acrylonitrile-butadiene rubber) metal ion crosslinked resin (Nippon Zeon Co., Ltd.)
Manufactured by Elaster).

Further, the support may be one in which a thermoplastic resin layer is further laminated, whereby the solvent resistance is further improved. Examples of the thermoplastic resin include polyolefin resin and nylon resin, and polyethylene and polypropylene are preferable.

Further, the above-mentioned support is preferably relatively flexible, and its 10% modulus (pulling speed 300 mm / min) at 23 ° C. × 65% RH is usually 0.3 to 4.0 kg / m 2.
m ² is preferably in the range of 0.6 to 2.5 Kg / mm ² , and more preferably 0.8 to 2.3 Kg / mm ² . When the 10% modulus exceeds 4.0 Kg / mm ² , the masking tape or sheet does not have the necessary flexibility, and it is difficult to attach it depending on the curved portion or uneven portion, and the desired line-out property cannot be obtained. .. Further, if the 10% modulus is less than 0.3 kg / mm ² , the tape is too flexible, the dimensional stability of the tape width due to the tension at the time of sticking is poor, the sticking workability is poor, and the desired wire drawing property cannot be obtained. ..

The 10% modulus is measured in accordance with the tensile strength and elongation test methods of JIS Z-0237. The above-mentioned support can be prepared by changing the composition ratio of the copolymer, the thickness of the thermoplastic resin to be laminated, the grade, etc.
The% modulus value can be adjusted within the above range.

The thickness of the support is usually 60 to 150 μm,
It is preferably 70 to 130 μm. If necessary, electron beam cross-linking, peroxide cross-linking, water cross-linking, etc. are applied.
The heat resistance and solvent resistance can be further improved.

When the support has a laminated structure,
Co-extrusion using a known extrusion technique such as inflation method or T-die method, or a known laminating technique such as heat-bonding of individually extruded individual films with a thermocompression roll. It is made by pasting.

The adhesive is preferably highly cohesive, for example, acrylic adhesive, natural rubber adhesive, synthetic rubber adhesive [SIS (styrene-isoprene-styrene), S
Block copolymers such as BS (styrene-butadiene-styrene), IR (isoprene rubber), and the like, mixed adhesives of natural rubber and synthetic rubber, and the like can be mentioned. The thickness of the pressure-sensitive adhesive layer is usually 5 to 100 μm, preferably 10
It is 50 μm.

As the method for providing the above-mentioned pressure-sensitive adhesive layer on the support, a method generally used in the past can be used, for example, a pouring method, a roll coater method, a reverse coater method,
A doctor blade method, a bar coater method or the like can be used.

[0021]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1 An ethylene / methacrylic acid copolymer resin (Nucrel 1207C, manufactured by Mitsui DuPont Polychemical Co., Ltd.) was used as a support to obtain a film having a thickness of 70 μm. The 10% modulus of this film at a temperature of 23 ° C and a relative humidity of 65%,
When measured at a pulling speed of 300 mm / min, 1.0 kg / mm ²
Met. An acrylic adhesive (SE-5300, manufactured by Showa Highpolymer Co., Ltd.) was applied to the support so that the thickness after drying was 25 μm to obtain an adhesive tape.

Example 2 A metal ion-crosslinked resin of ethylene-methacrylic acid copolymer (HIMIRAN 1652, manufactured by Mitsui DuPont Polychemical Co., Ltd.) was used as a support to obtain a film having a thickness of 90 μm. The 10% modulus of this film was measured in the same manner as in Example 1 and found to be 1.2 kg / mm ² . Further, a natural rubber-based pressure-sensitive adhesive was applied to the support so that the thickness after drying was 25 μm to obtain a pressure-sensitive adhesive tape.

Example 3 FIG. 1 shows a sectional view of an adhesive tape of Example 3 of the present invention. This pressure-sensitive adhesive tape comprises a pressure-sensitive adhesive layer 4 on the lower side of a support 5 composed of an upper layer 1, an intermediate layer 2 and a lower layer 3.
Is provided. Here, the upper layer 1 and the lower layer 3 are made of a linear high-density polyethylene resin (density 0.94) and each has a thickness of 20 μm. The intermediate layer 2 uses the same high milan 1652 as in Example 2 and has a thickness of 30 μm. The pressure-sensitive adhesive layer 4 is made of the same pressure-sensitive adhesive as in Example 2, and has a thickness of 20 μm. The three-layer laminated support 5 was coextruded by the T-die method to form a film, and the 10% modulus of the obtained film was measured in the same manner as in Example 1 and found to be 1.6 kg / mm ² .

Example 4 The three-layer laminated film obtained in Example 3 was irradiated with an electron beam of 10 Mrad to obtain a crosslinked film having a gel content of 50%. The 10% modulus of this film was measured in the same manner as in Example 1 and found to be 1.7 kg / mm ² . Further, the same pressure-sensitive adhesive as in Example 2 was applied to the support so that the thickness after drying was 20 μm to obtain a pressure-sensitive adhesive tape.

Comparative Example 1 As a support, a 100 μm thick polyvinyl chloride film plasticized with 40 parts by weight of a polyester plasticizer (Polycizer W-360ELS, manufactured by Dainippon Ink and Chemicals, Inc.) was used. When the 10% modulus of this film was measured in the same manner as in Example 1, it was 1.4 Kg / mm ² . Further, the same adhesive as in Example 2 was applied so that the thickness after drying would be 30 μm to obtain an adhesive tape.

Comparative Example 2 A low-density polyethylene (density 0.92) having a thickness of 80 μm was used as a support. The 10% modulus of this film was measured in the same manner as in Example 1 and found to be 1.0 kg / mm ² . Further, the same adhesive as in Example 2 was applied so that the thickness after drying was 20 μm to obtain an adhesive tape.

Experimental Example 1 With respect to the above-mentioned pressure-sensitive adhesive tapes, the adhesive strength, 100R curved surface sticking property, line-out property and adherend stain property were measured by the following methods. The results are shown in Table 1.

Adhesion force: According to the JIS C-2107 test method, 23 ° C. × 65% RH, pressure bonding load 2 kg rubber roller 1 reciprocation, pulling speed 300 mm / m
The peel force at in was measured.

100R curved surface sticking property A circle having a diameter of 100 mm was drawn on a melamine coated plate, the state of the tape when the tape was stuck along the circumference was examined, and the following criteria were evaluated. ○: Can be attached along the circumference without wrinkles or floats △: Can be attached along the circumference but has some wrinkles or floats ×: Difficult to stick along the circumference

Drawability The resulting tape was attached to a melamine coated plate, and
Spray a urethane-based paint (High Urethane No. 5000 manufactured by NOF CORPORATION) diluted with a solvent with a spray gun to a thickness of 30 μm after drying, dry at 70 ° C for 30 minutes, and then cool at room temperature. Then, the tape was peeled off. Penetration of the coating material due to swelling with a solvent and floating of the tape end portion were visually inspected, and evaluated according to the following criteria. ○: No paint penetrated into the tape-attached surface. △: Paint penetrated part of the tape edge. ×: Paint penetrated all over the tape edge.

Contamination property of adherend After the above test, the tape was peeled off, and the contamination of the part where the tape was adhered with the plasticizer was visually inspected and evaluated according to the following criteria. ○: No contamination of adherends △: Contamination of adherends partially seen ×: Contamination of adherends observed all over

[0033]

[Table 1]

[0034]

EFFECTS OF THE INVENTION The masking tape or sheet for painting of the present invention adheres well to curved portions (surfaces) and adherends with large irregularities, does not rise or turn over, and makes the parting line during painting beautiful and sharp. Can be finished. Further, since the support does not contain a plasticizer, the plasticizer does not reduce the cohesiveness of the pressure-sensitive adhesive and the surface to be adhered does not deteriorate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an adhesive tape of Example 3.

[Explanation of symbols]

 1 Upper Layer 2 Middle Layer 3 Lower Layer 4 Adhesive Layer 5 Support

Claims (3)

[Claims] 1. A pressure sensitive adhesive is provided on one surface of a support comprising a copolymer of olefins and an unsaturated carboxylic acid, a copolymer of olefins and another vinyl monomer, or a neutralized product of these copolymers. A masking tape or sheet for painting, which is provided with layers. 2. The masking tape or sheet for coating according to claim 1, wherein the support is further laminated with a thermoplastic resin layer. 3. A support at 23 ° C. × 65% RH at 1
The masking tape or sheet for coating according to claim 1 or ² , wherein the 0% modulus is 0.3 to 4.0 kg / mm ² .