JPH09169960A - Tacky label or tape and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a tacky label or tape capable of carrying out the in-line coating even in the combination of an addition reactional curing type silicone composition with an acrylic tacky agent and provide a method for producing the tacky label or tape. SOLUTION: This tacky label or tape is obtained by successively laminating a mold release agent layer 2 comprising a cured film of an addition reactional curing type silicone composition and an acrylic tacky agent layer 3 containing 0.01-1wt.% platinum-based catalyst poisoning substance. The tacky label or tape has excellent peeling characteristics and is capable of carrying out the in-line coating and excellent in productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive label attached to a product or the like, an adhesive tape for packing, and a method for producing the same.

[0002]

2. Description of the Related Art
For the purpose of preventing adhesion and sticking of a pressure sensitive adhesive to a base material such as paper, processed paper or plastic film, a silicone composition film is formed on the surface of the base material to impart releasability. ing.

In this case, as a method for forming a silicone film on the surface of a substrate, an organopolysiloxane containing an aliphatic unsaturated group and an organohydrogenpolysiloxane are subjected to an addition reaction by using a platinum compound as a catalyst and then separated. A method of forming a moldable film, a method of forming a mold-releasing film by subjecting an organopolysiloxane to a condensation reaction using an organic acid metal salt catalyst such as an organic tin compound, are known. Silicone compositions used in these methods are all called a heat cure type for forming a film by heating, a solvent type in which silicone is dissolved in an organic solvent such as toluene depending on its properties,
It is classified into an emulsion type dispersed in water and a solventless type consisting only of silicone. As the adhesive, (a) solvent type rubber type, (b) solvent type acrylic type,
(C) Emulsion type acrylic type, (d) hot melt type, but in combination of addition reaction curing type silicone and acrylic adhesive (particularly (b) solvent type), silicone coating and adhesion When an adhesive label or adhesive tape is manufactured by an in-line method in which the agent processing is performed on the same line, the peeling force is extremely heavy, and in some cases, the peeling may not be possible. Therefore, in the above combination,
An off-line method of aging after silicone coating and coating an adhesive is usually used.

However, even in this case, since the peeling force changes depending on the aging conditions (temperature, time, humidity) of silicone, the peeling force is stable in order to manufacture an adhesive label or adhesive tape of a certain quality. Weekly aging was required.

The present invention has been made in view of the above circumstances, and provides an adhesive label or tape capable of in-line coating even in the combination of an addition reaction-curable silicone composition and an acrylic adhesive, and a method for producing the same. With the goal.

[0006]

Means for Solving the Problems and Modes for Carrying Out the Invention As a result of intensive studies to achieve the above object, the present inventor has found that an organopolysiloxane containing an alkenyl group on a substrate and an organohydrogen Polysiloxane,
After forming a cured film (release agent layer) of an addition reaction curable silicone composition containing a platinum-based catalyst as a main component, 0.01 to 1% (wt%, platinum-based catalyst poisoning substance) of a platinum-based catalyst poisoning substance is formed thereon. The same shall apply hereinafter) When an added acrylic pressure-sensitive adhesive is applied, peeling does not become heavy, and it is possible to perform the formation of the release agent layer and the formation of the acrylic pressure-sensitive adhesive layer on the same line (in-line). I found it.

That is, although the platinum-based catalyst contained in the addition reaction-curable silicone composition acts as an effective catalyst for the curing reaction of the organopolysiloxane, it retains its activity even after the reaction and the Since it also acts as an addition reaction catalyst between the SiH group and the acrylic group in the acrylic pressure-sensitive adhesive, if the residual amount of SiH group in the cured silicone film is large, the acrylic pressure-sensitive adhesive will be peeled off heavily. On the other hand, when the platinum-based catalyst poisoning substance is added to the acrylic adhesive, the catalytic action of the platinum-based catalyst in the silicone cured coating is inhibited, and the SiH group in the silicone cured coating and the acrylic adhesive in the acrylic adhesive are It was found that a light peeling force can be obtained even when the addition reaction with a group is suppressed and the release agent layer and the acrylic pressure-sensitive adhesive layer are formed in-line, and the present invention has been accomplished. Is.

In addition, since the hydrosilylation reaction is suppressed at ambient temperature and the hydrosilylation reaction proceeds rapidly when the substrate is heated after being applied as a thin film, the addition reaction-curable silicone composition is similar to an acetylene compound. Although a reaction control agent is added, the boiling point of 200 ° C or less is generally used, the residual amount in the cured silicone film is small, and the effect of poisoning the catalyst is weak.
There is almost no effect of preventing the reaction between the base and the acrylic adhesive.

Therefore, according to the present invention, (1) a release agent layer composed of a cured film of an addition reaction curable silicone composition and a platinum-based catalyst poisoning substance of 0.01 are formed on at least one surface of a substrate.
A pressure-sensitive adhesive label or tape comprising an acrylic pressure-sensitive adhesive layer added in an amount of 1% to 1%, and (2) a cured film of an addition reaction-curable silicone composition on at least one surface of a substrate. After the release agent layer is formed, an acrylic pressure-sensitive adhesive layer containing 0.01 to 1% of a platinum catalyst poisoning substance is formed on the release agent layer in the same line as the release agent layer. A method for manufacturing an adhesive label or tape is provided.

The present invention will be described in more detail below. In the present invention, as the base material, a paper base material such as high-quality paper, glassine paper, polyethylene laminated paper, clay coated paper, or a film base material such as polyethylene, polypropylene or polyester. Is used.

The addition reaction curable silicone composition used in the present invention comprises an organopolysiloxane having an alkenyl group bonded to at least two silicon atoms in one molecule and at least three or more silicon atoms in one molecule. An organohydrogenpolysiloxane having a hydrogen atom bonded to an atom, a platinum-based catalyst as a main component, and a hydrosilylation reaction control agent and the like if necessary,
Known compositions can be used as this composition.

In the organopolysiloxane having an alkenyl group, the alkenyl group is a vinyl group,
Examples thereof include an allyl group, a hexenyl group, and a dodecenyl group, and the economically preferable alkenyl group is a vinyl group. This alkenyl group is from 0.05 to 0.05 with respect to all the organic groups bonded to the silicon atom in the organopolysiloxane.
The content is preferably 50 mol%, particularly 0.2 to 10 mol%. If the amount of alkenyl groups is less than 0.05 mol%, a substantial curing rate may not be obtained, and 5
If it exceeds 0 mol%, the synthesis becomes difficult and the peeling force becomes heavy. Examples of the organic group other than the alkenyl group bonded to the silicon atom include an alkyl group such as a methyl group, an ethyl group and a propyl group, an aryl group such as a phenyl group and a tolyl group, or a hydrogen bonded to these carbon atoms. Examples thereof include substituted or unsubstituted monovalent hydrocarbon groups of the same type or different types in which some or all of the atoms are substituted with halogen atoms, cyano groups and the like. It is desirable that 50 mol% or more of the organic groups other than the alkenyl group bonded to the silicon atom are methyl groups with respect to all the organic groups.

The organopolysiloxane is preferably linear, but may be branched. The substituent bonded to the silicon atom at the terminal may be, for example, any group such as an alkenyl group, an alkyl group, a hydroxyl group, and an alkoxy group, but it is preferable that there is at least one alkenyl group.

The viscosity of the organopolysiloxane is preferably 100 centipoise or higher at 25 ° C.

Next, the organohydrogenpolysiloxane is not particularly limited in the organic groups bonded to silicon atoms other than hydrogen atoms, and various organic groups can be used, and the same organic groups as those mentioned above can be mentioned. However, 90 of all organic groups
It is desirable that the mol% or more is a methyl group.

Specific examples of such an organohydrogenpolysiloxane include (CH ₃ ) HSiO units,
HSiO _3/2 unit, (CH ₃ ) ₂ SiO unit, (CH ₃ ) ₃
Examples thereof include homopolymers or copolymers composed of SiO _1/2 units, which may be linear, branched or cyclic.

The viscosity of the organohydrogenpolysiloxane is preferably 10 to 100 centipoise at 25 ° C.

The amount of the organohydrogenpolysiloxane blended is adjusted according to the amount of alkenyl groups in the alkenyl group-containing organopolysiloxane, and the SiH group / alkenyl group is in a molar ratio of 1.2 to 3.0. It is desirable in terms of adhesion to the substrate and peeling properties. If it is less than 1.2, the peeling property and film-forming property are impaired, and if it exceeds 3.0, the peeling becomes heavy.

Further, the platinum-based catalyst is a catalyst for promoting the addition reaction, and a known addition reaction catalyst can be used. Examples thereof include chloroplatinic acid, alcoholic solutions of chloroplatinic acid, aldehyde solutions, complexes of chloroplatinic acid with various olefins and vinyl siloxanes, and 0.001 to 0.001 as platinum based on 100 parts by weight of alkenyl group-containing organopolysiloxane. Used in the range of 0.1 parts by weight.

On the other hand, as the acrylic pressure-sensitive adhesive, a known one conventionally used for pressure-sensitive adhesive labels or tapes can be used. For example, a solvent-type acrylic pressure-sensitive adhesive which is an organic solvent solution of acrylic resin, An emulsion type acrylic pressure-sensitive adhesive which is an emulsified water dispersion of an acrylic resin can be used.

In the present invention, a platinum catalyst poisoning substance is added to the acrylic pressure-sensitive adhesive. Examples of the platinum catalyst poisoning substance include phosphorus atom-containing compounds such as triphenylphosphine, phosphoric acid ester of polyoxyethylene alkyl ether, tin compounds such as dibutyltin dioctoate and dibutyltin diacetate, dipropylamine, benzothiazole, etc. Examples thereof include compounds having a nitrogen atom or a sulfur atom. Among them, phosphorus compounds are excellent because they have a strong poisoning effect on platinum catalysts. Here, the platinum-based catalyst poisoning substance is added to the pressure-sensitive adhesive, and the platinum-type catalyst poisoning substance-added pressure-sensitive adhesive is applied to a film thickness of 10 to 50 μm. It is necessary for the catalyst poisoning substance to remain in the pressure-sensitive adhesive layer. Therefore, the boiling point of the platinum-based catalyst poisoning substance is preferably 200 ° C. or higher under normal pressure.

The amount of the platinum-based catalyst poisoning substance added to the adhesive is 0.01 to 1% with respect to 100 parts by weight of the solid content of the adhesive.
used. This is because if it is less than 0.01%, the effect of preventing the action of the platinum-based catalyst is small, and if it is more than 1%, the characteristics of the pressure-sensitive adhesive are impaired. A more preferable range is 0.
1 to 0.5%.

In the case of producing the pressure-sensitive adhesive label or tape of the present invention, the addition reaction-curable silicone composition is applied to paper,
A dry coating is applied to a substrate such as a plastic film so as to have a thickness of 0.1 to 3 μm, and the coating is heated to form a cured film. Further, a predetermined amount of an acrylic adhesive containing a platinum-based catalyst poisoning substance is applied on a cured silicone film, and after drying, a top paper is attached to the adhesive label and the adhesive tape is wound up as it is to produce each. It is possible to manufacture an adhesive tape or an adhesive label as shown in FIGS. In the figure, 1 is a base material, 2 is a release agent layer, 3 is an adhesive layer, and 4 is a surface paper.

Here, so-called in-line coating, in which the pressure-sensitive adhesive is processed in the same line immediately after forming the silicone cured film, has high energy efficiency and has great production advantages such as the need for intermediate stock.

[0025]

As described above, the pressure-sensitive adhesive label or pressure-sensitive adhesive tape of the present invention has excellent peeling properties, and in-line coating is also possible, resulting in excellent productivity.

[0026]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In the following examples, all parts are parts by weight, and the viscosity has a value of 25 ° C.

[Example 1] Addition reaction curable silicone composition KS847 (manufactured by Shin-Etsu Chemical Co., Ltd.) on the polyethylene laminated surface of the polyethylene laminated paper substrate (1).
Dissolve 100 parts in 500 parts of toluene, and use platinum catalyst Cat
-PL-50T (manufactured by Shin-Etsu Chemical Co., Ltd.) 1 part of a releasable coating liquid was applied using a gravure coater to a film thickness (dry) of 0.6 micrometer, and hot air circulation type The release agent layer (2) was obtained by drying at 140 ° C. for 20 seconds in a dryer.

On this release agent layer (2), a solvent-type acrylic pressure-sensitive adhesive BPS8170 (manufactured by Toyo Ink Mfg. Co., Ltd.) 1
A mixture of 00 parts with 0.01 parts, 0.1 parts and 1 part of benzothiazole was used to form a film having a film thickness of 2 using an applicator.
Immediately after forming the cured film and 2
After 24 hours at 5 ° C, apply and dry at 100 ° C for 3 minutes,
An adhesive layer (3) was provided to obtain the adhesive tape shown in FIG.

After the resulting tape was aged at 25 ° C. for 24 hours, the force required for peeling in the direction of 180 ° at a speed of 0.3 m / min was measured and used as the peeling force. Further, the peeled adhesive surface was attached to a stainless steel plate, pressure-bonded with a 2 kg roller, and left at 25 ° C. for 3 hours to give 180 m in a direction of 0.3 m /
The force required when peeling at a speed of minutes was measured and used as the adhesive force. Moreover, the tack of the peeled adhesive surface was measured by J. Based on the DOW method, the maximum diameter of the steel ball that stopped was measured. Table 1 shows the results.

Example 2 On one side of the glassine paper base material (1), 100 parts of an addition reaction curable silicone composition KS847 (manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in 400 parts of toluene, and a platinum catalyst Cat-PL was used. Using a gravure coater, a releasable coating solution containing 1 part of -50T (manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to a film thickness (dry) of 0.9 micrometer, and a hot air circulation dryer was used. At 120 ° C for 3
It was dried for 0 seconds to obtain a release agent layer (2).

On this release agent layer (2), a solvent-type acrylic pressure-sensitive adhesive BPS8170 (manufactured by Toyo Ink Mfg. Co., Ltd.) 1
A mixture of 0.1 part of phosphoric acid ester of polyoxyethylene alkyl ether [Phospher RD-710 (manufactured by Toho Chemical Industry Co., Ltd.)] in 00 parts so that the film thickness becomes 25 μm using an applicator. Immediately after formation of the cured film and after 24 hours at 25 ° C, apply at 100 ° C for 3
After drying for a minute, a pressure-sensitive adhesive layer (3) was provided, and a high-quality paper was attached onto the pressure-sensitive adhesive layer to form a surface paper (4) to obtain the pressure-sensitive adhesive label shown in FIG.

After aging the obtained label at 25 ° C. for 24 hours, the peeling force, the adhesive force and the ball tack were measured in the same manner as in Example 1. Table 2 shows the results.

Comparative Example 1 A pressure-sensitive adhesive tape was manufactured by using the solvent-type acrylic pressure-sensitive adhesive BPS8170 in Example 1 without adding benzothiazole. The results of peeling force, adhesive force and ball tack are shown in Table 1.

Comparative Example 2 In Example 2, solvent-type acrylic pressure-sensitive adhesive BPS8170 was added to Phosfar RD-7.
An adhesive label was produced without adding 10. The results of peeling force, adhesive force, and ball tack are shown in Table 2.

[0035]

[Table 1]

[0036]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an adhesive tape of the present invention.

FIG. 2 is a cross-sectional view showing an example of the adhesive label of the present invention.

[Explanation of symbols]

 1 Base Material 2 Release Agent Layer 3 Adhesive Layer 4 Surface Paper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Isobe 1 Hitomi, Oita, Matsuida-cho, Usui-gun, Gunma 10 Shin-Etsu Chemical Co., Ltd. Silicone Electronic Materials Research Laboratory

Claims (3)

[Claims] 1. An acrylic adhesive in which a release agent layer comprising a cured film of an addition reaction curable silicone composition and 0.01 to 1% by weight of a platinum catalyst poisoning substance are added to at least one surface of a substrate. A pressure-sensitive adhesive label or tape comprising an agent layer sequentially laminated. 2. The adhesive label or tape according to claim 1, wherein the platinum-based catalyst poisoning substance has a boiling point of 200 ° C. or higher. 3. A release agent layer comprising a cured film of an addition reaction-curable silicone composition is formed on at least one surface of a substrate, and the platinum-based catalyst poisoning substance is added in an amount of 0.01 to 0.01 in the same line. A method for producing a pressure-sensitive adhesive label or tape, comprising forming an acrylic pressure-sensitive adhesive layer added at 1% by weight on the release agent layer.