JPH08134484A - Water-based release agent composition and pressuresensitive adhesive tape or sheet made using the same - Google Patents

Abstract

PURPOSE: To provide a water-based release agent which is capable of forming a film in a reduced time for heating and drying and which does not emit any substance harmful to safety and the environment, although water is released therefrom in drying. CONSTITUTION: The composition comprises water and, dispersed or dissolved therein, a release agent having a melting point of 40 deg.C or higher and a liquid having a b.p. at ordinary pressure of 100 deg.C or higher and a viscosity at ordinary temp. of 100,000mPa.s or lower. The tape or sheet comprises a pressure-sensitive adhesive layer in contact with a release film obtained by applying and drying this composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous release agent composition and an adhesive tape or sheet using the same.

[0002]

2. Description of the Related Art To store a sticky substance, a so-called releasable film having a larger cohesive force than the adhesive force at the interface with the sticky substance is placed in a container or a sheet formed therein. It is also attached and stored for the convenience of handling and use.

For example, for adhesive tapes or sheets generally used for various purposes, polyvinyl alcohol-long chain alkyl isocyanate modified product, polyethyleneimine-long chain alkyl isocyanate modified product, etc. are usually used as a release agent. The releasing agent is dissolved in an organic solvent, applied on the surface of the adhesive tape opposite to the adhesive layer, and dried to form a releasing film.

Although the above-mentioned release agent exhibits extremely excellent release performance on adhesive tapes or sheets, since it contains a large amount of organic solvent, it causes a fire during storage or use thereof. Due to the danger of explosion, hygiene of workers and residents near the workplace, and environmental pollution and destruction of the environment, there is an urgent need for organic solvent removal.

Japanese Unexamined Patent Publication No. 3-86778 proposes a water-based releasing agent obtained by post-emulsifying a long-chain alkyl graft polymer obtained by reacting polyvinyl alcohol, polyallyl alcohol or a modified product thereof with an alkyl isocyanate. There is.

Further, Japanese Patent Laid-Open No. 6-73351 discloses that
(A) A long-chain alkyl monoisocyanate compound (a2) having 8 or more carbon atoms per molecule of the polyamine compound (a1) having a plurality of active hydrogen-containing amino groups (a1) and (a2) at a ratio of a plurality of molecules. A strippable composition comprising a long-chain alkyl addition compound obtained by an addition reaction and (B) at least one of compounds having two or more functional groups capable of reacting with active hydrogen of an amino group in one molecule. Is proposed.

However, both of the above cited examples have a problem that they have to be heated for a long time in a film forming process in which water as a dispersion medium is dried and emulsion particles are fused with each other to form a film. Is.

Generally, an organic solvent having a low boiling point is added to the emulsion as described above as a film forming property-improving agent in order to shorten the heating for a long time in the film forming process, but the organic solvent remaining in the film forming process is In order to prevent the anchor of the releasable film formed from deteriorating or moving to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape or sheet and deteriorating the adhesive performance, a low-boiling point organic solvent that is less likely to be used is used. It was.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to shorten the drying time in the film-forming process of the release agent and to discharge it at the time of drying. The purpose is to provide a water-based mold release agent that does not emit substances that threaten safety or the environment, other than the water used.

[0010]

The present invention according to claim 1 has a releasing agent having a melting point of 40 ° C. or higher, a boiling point at atmospheric pressure of 100 ° C. or higher, and a viscosity of 100,00 at room temperature.
A gist of an aqueous release agent composition is characterized in that a high-boiling-point liquid substance having a boiling point of 0 mPa · s or less is dispersed or dissolved in water.

The present invention according to claim 2 is characterized in that a release film obtained by applying the water-based release agent composition according to claim 1 and drying it is laminated in contact with the adhesive layer. The subject is a pressure-sensitive adhesive tape or sheet.

The release agent used in the present invention according to claim 1 has a melting point of 40 ° C. or higher, is capable of forming a film, and has a cohesive force rather than an adhesive force at the interface with the adhesive layer. There is no particular limitation as long as it is composed of a large compound.

The above releasing agent has a releasing property of reducing the peeling force when the release sheet is peeled from the adhesive layer or when the adhesive layer is peeled from the back surface of the wound adhesive tape. Since the cohesive force is larger than the adhesive force at the interface with the above-mentioned pressure-sensitive adhesive layer, the formed releasable film coagulates and destroys and contaminates the pressure-sensitive adhesive layer, and does not substantially affect the adhesiveness. It has non-transfer performance.

The reason for limiting the melting point of the release agent to 40 ° C. or higher is to satisfy various performances of the release agent.
Examples of such a releasing agent include polystearyl acrylate, polystearyl acrylamide, polyvinyl stearate, polyvinyl stearyl ether, cellulose tristearate, polyvinyl stearyl carbamate, and polystearoyl ethyleneimine having 6 carbon atoms.
The above long-chain alkyl group-containing polymer, a copolymer of phenylmethylsiloxane and dimethylsiloxane, 2- (2
-Hydroxyethylthio) ethyl group-containing condensate of methylphenylsiloxane and acrylic polymer having a hydroxyl group, silicone polymer such as condensate of α, ω-dihydroxypolydimethylsiloxane / triacetoxyvinylsilane / TDI, poly (1 , 1-dihydroperfluorohexyl methacrylate), poly (N-ethyl, N
-Perfluorooctanesulfoamidoethylmethacrylate), perfluoro-based polymers such as N-methylperfluorooctanesulfoamidediaminotriazine methylol compound, polymers of stearamide and polyethylene, alkyd resins, vinyl acetate copolymers, etc. Examples thereof include a mixture with an alkyl group-containing compound.

The high-boiling-point liquid substance having a boiling point of 100 ° C. or more at atmospheric pressure and a viscosity at room temperature of 100,000 mPa · s or less, which is used in the present invention according to claim 1,
It has a function of facilitating the formation of a releasable film by compatibilizing the releasing agent and softening it, and examples thereof include naphthenic oil, lanolin, oligomers of olefins, vegetable oil, animal oil, and process oil. A mineral oil such as the above, a liquid tackifying resin such as a liquid rosin or turpentine, and a plasticizer such as polybutene or diisodecyl phthalate are used.

The boiling point of the above liquid substance at atmospheric pressure is 100.
If the temperature is lower than 0 ° C, it may evaporate and volatilize depending on the drying temperature applied in the film forming process for forming the releasable film, which is not preferable from the viewpoint of safety and environment.
Also, the viscosity of the high boiling point liquid substance at room temperature is 100,000.
When it exceeds 0 mPa · s, the fluidity is low in the film forming process for forming the releasable film, and it does not contribute to the improvement of the film forming property.

The above-mentioned high-boiling-point liquid substance having a boiling point of 100 ° C. or higher under atmospheric pressure and a viscosity at room temperature of 100,000 mPa · s or lower has the above-mentioned properties and functions, and therefore is used as a base material. In the film-forming process to form a releasable film,
It acts as a softening agent as one component of the formed releasable film, and some of it migrates to the adhesive layer when in contact with the adhesive layer, but it substantially affects the adhesive performance. There is no such thing. Further, as described above, in the film-forming process, there is substantially no evaporation or volatilization due to the drying temperature applied, so there is no adverse effect on safety and the environment.

In addition to the above-mentioned components, additives such as a surfactant and a crosslinking agent can be appropriately selected and used within a range not departing from the spirit of the present invention. The above-mentioned surfactant facilitates dispersion of the above components in water, suppresses foaming, and further, in the step of applying the resulting water-based release agent composition, the back surface of the release sheet or the adhesive tape substrate. It has the function of improving the wettability (opposite surface of the adhesive layer) and forming a uniform coating film.

Examples of the above-mentioned surfactant include ether type such as polyoxyethylene alkyl phenyl ether and polyoxyethylene alkyl ether, ester type such as glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyethylene glycol fatty acid ester, and the like. Nonionic surfactants composed of ester ether type such as polyoxyethylene sorbitan fatty acid ester, fatty acid alkanolamide type, etc., carboxylic acid type such as fatty acid monocarboxylic acid salt, N-acryloylglutamate, alkylbenzene sulfonate, naphthalene sulfone Acid-formaldehyde condensates, sulfonic acid types such as sulfosuccinic acid dialkyl esters, sulfuric acid ester types such as sulfuric acid alkyl esters, and phosphoric acid ester types such as phosphoric acid alkyl esters. ON-type surfactant, amine salt type such as alkylamine salt, quaternary ammonium salt type such as alkyltrimethylammonium salt, dialkyldimethylammonium salt, alkyldimethylbenzylammonium salt, etc., cationic surfactant, N, N Examples include amphoteric surfactants such as carboxybetaine type such as dimethyl-N-alkylaminoacetic acid betaine and glycine type such as 2-alkyl-1-hydroxyethyl-1-carboxymethylimidazolinium betaine.

The cross-linking agent is the heat generated in the film-forming process,
It has a function of introducing a cross-linking structure into the formed releasable film by a crosslinking reaction by light or the like to improve the strength of the releasable film.

As the cross-linking agent, for example, polyvalent isocyanate compounds, blocked polyvalent isocyanate compounds, polyvalent epoxy compounds, polyvalent acroyl compounds, polyvalent methylol compounds, polyvalent aziridine compounds, polyvalent metal ions and the like are preferable. Can be used for

The water-based release agent composition of the present invention according to claim 1 is prepared by dissolving the release agent and the high-boiling-point liquid substance in an appropriately selected organic solvent, and then stirring the mixture in a high-speed emulsifying machine in a predetermined amount. Mixed with water, emulsified and dispersed, then a solvent dissolution method excluding the organic solvent, without using an organic solvent, the release agent and the high-boiling-point liquid substance is melted by heat, a pressure kneader, a colloid mill It can be produced by a high-pressure emulsification method or the like which is used, mixed with a predetermined amount of water, and emulsified and dispersed.

The adhesive tape or sheet of the present invention according to claim 2 is a polyethylene, polypropylene, polyester or vinyl chloride resin having an adhesive layer on one surface thereof,
The water-based release agent composition of the present invention according to claim 1 is applied to the other surface of a substrate made of a plastic film such as cellophane, a paper such as kraft paper, and Japanese paper, and dried by heating to form a release film. It may be formed and wound on a core material, and as described above, a plastic film such as polyethylene, polypropylene, polyester, cellophane, fine paper, kraft paper, crepe paper, glassine paper, etc. 2. The water-based release agent composition of the present invention according to claim 1 is applied to one or both sides of a base material such as paper, impregnated paper, plastic-coated paper or the like, or a cloth or the like, and heated and dried. The release sheet with the release film formed on it by using the above-mentioned adhesive tape or sheet base material, polyethylene foam, acrylic acid foam, non-woven fabric, woven fabric, etc. Cohesive tape or stuck to the adhesive layer of the sheet, or which has been made and the adhesive tape or sheet was Mekuomo to or core material as sheet.

[0024]

EXAMPLES The present invention will be specifically described based on the following examples.

(Example 1) 42.9 parts by weight of a long-chain alkyl organic releasing agent (manufactured by Yasuhara Chemical Co., trade name: Release 70, melting point 80 ° C, 7% by weight toluene solution), anionic surfactant (Kao) Product name: Perex OT
P, 10% by weight methanol solution) 4.0 parts by weight, nonionic surfactant (manufactured by Kao, trade name: Emulgen 91)
3) 0.4 parts by weight, high-boiling-point liquid substance 1: naphthene-based process oil (manufactured by SUNOCO, trade name: Kansen oil, viscosity 1,100 mPa · s, boiling point 20 under atmospheric pressure)
(0 ° C or higher) 0.1 part by weight and 97.0 parts by weight of water are mixed, and the number of revolutions is 10,0 with a vacuum type emulsifying machine (made by Tokushu Kika Co., Ltd.)
Stir at 00 rpm for 60 minutes to emulsify. Then 50
The pressure is reduced to 60 mmHg at ℃, and the solvent such as the solvent toluene is removed while stirring. At this time, the water azeotropically removed with toluene was replenished with the reduced amount under stirring. Thus, an aqueous release agent composition was obtained. (Example 2) Polyethylene was extrusion-laminated to a thickness of 20 μm on a Klupack kraft paper having a basis weight of 75 mg / m ² , and
The polyethylene surface was treated with corona discharge (44 dyne / c
m) The water-based release agent composition obtained in Example 1 was applied to the polyethylene surface of the sealing paper with a # 8 Meyer bar coater at 8.5 g / m ² , and then the drying conditions shown in Table 1 were used. After drying at 120 ° C. for 60 seconds, a release sheet was obtained.

Separately, SIS (manufactured by Shell Chemical Co., trade name:
TR-1107) 100 parts by weight, C5 tackifying resin (manufactured by Nippon Zeon Co., Ltd., trade name: Kraton A-100) 1
00 parts by weight, rosin-based tackifying resin (manufactured by Arakawa Chemical Industry Co., Ltd., trade name: Super Ester L) 25 parts by weight, naphthene-based process oil (manufactured by SUNOCO, softener, trade name: Kansen Oil) 50 parts by weight, aging An adhesive comprising 2 parts by weight of an inhibitor (trade name: Irganox 1010, manufactured by Ciba Geigy) and 500 parts by weight of toluene was applied at 83 g / m ² on the sealing paper used for the release sheet, and 1
It was dried at 20 ° C. for 60 seconds to obtain an adhesive sheet. A pressure-sensitive adhesive sheet was obtained in which the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet was brought into contact with the release film of the release sheet and the pressure-sensitive adhesive layer was protected.

(Examples 3, 5, 7), (Comparative Examples 1, 3) An aqueous release agent composition was obtained in the same manner as in Example 1 except that the high boiling point liquid substance was changed as shown in Table 1. It was The high-boiling-point liquid substance 2 used in Examples 5 and 7 is rosin ester (manufactured by Arakawa Chemical Industry Co., Ltd., trade name: Super Ester L,
Viscosity 40,000 mPa · s, boiling point 200 under atmospheric pressure
℃ or more).

(Examples 4, 6, 8), (Comparative Examples 2, 4) Using the water-based release agent compositions obtained in the immediately preceding Examples and Comparative Examples, the same procedure as in Example 2 was carried out. An adhesive sheet with an adhesive layer protected was obtained.

The spreading force and the residual adhesive force of the pressure-sensitive adhesive sheet or release sheet obtained in the above examples were measured by the following methods.

1. Spreading power: Based on JIS Z-0237, a sample is prepared in a 25 mm width strip form from the pressure-sensitive adhesive sheet obtained by protecting the pressure-sensitive adhesive layer obtained in each of the even-numbered examples and comparative examples, and pressure-bonded by a specified pressure-bonding roller. And then at 24 ° C for 24 hours
Leave for hours. Then, the above sample was subjected to a "180 degree peel test" at a speed of 10 m / min using a high speed peel tester.
I went. The obtained peeling force is also shown in Table 1 as a developing force, and this force substitutes the peeling performance of the release agent. 2. Residual adhesive strength: In accordance with JIS Z-0237, a sample was prepared in the same manner as in the test of the previous section, after which the release sheet was peeled off and the pressure-sensitive adhesive sheet was attached to a stainless steel plate, and it was placed at 23 ° C. for 24 hours.
Leave for hours. Then, a "180 degree peeling test" was performed at a speed of 300 mm / min. At the same time, the pressure-sensitive adhesive sheet before protection with a release sheet was also measured, and the ratio of the former to the latter was expressed in percentage. This value substitutes for the non-transfer performance of the release agent to the adhesive surface.

[0031]

[Table 1]

As shown in Table 1, each of the water-based release agent compositions obtained in the examples of the present invention has excellent film-forming properties, and the release properties obtained at the indicated drying temperature and drying time are shown. The coating bonds strongly to the substrate and exhibits good release and non-migration performance.

On the other hand, in the case of the water-based release agent composition of Comparative Example 1, even if a release film was formed under the same conditions as in Example, the release was insufficient and the release sheet was difficult to peel off. It also shows that the adhesiveness is extremely lowered. In order to make the performance of the releasable coating in the above comparative example equal to that of the example, as shown by the result of the comparative example 4, the drying time in the example is 4
It takes more than double the time.

[0034]

Since the water-based release agent composition of the present invention according to claim 1 is constituted as described above, it is
There is no safety and environmental problems due to the organic solvent, it is possible to shorten the drying time in the film forming process of the release agent, the resulting release film can be firmly bonded to the substrate, and
Since it is excellent in non-migration property to an adhesive substance, it can be provided for a wide range of applications.

Since the pressure-sensitive adhesive tape or sheet of the present invention according to claim 2 uses the water-based release agent composition of the present invention according to claim 1, in addition to the above excellent film-forming property, Since the release agent is firmly bonded to the base material and is rarely transferred to the adhesive layer, excellent adhesiveness and spreadability can be maintained for a long period of time.

Claims (2)

[Claims] 1. A release agent having a melting point of 40 ° C. or higher, a boiling point at atmospheric pressure of 100 ° C. or higher, and a viscosity at room temperature of 1
A water-based release agent composition, wherein a high-boiling-point liquid substance having a boiling point of 0,000 mPa · s or less is dispersed or dissolved in water. 2. A pressure-sensitive adhesive tape or sheet, wherein a release film obtained by applying the water-based release agent composition according to claim 1 and drying it is laminated in contact with the pressure-sensitive adhesive layer.