JPS63235386A - Tacky tape or sheet - Google Patents

Abstract

PURPOSE:To obtain the title tape or sheet which has excellent unrollability even when rolled into a roll, can be applied on top of another, and has the back side good for writing with an oil-base ink, by laminating two kinds of specified laminate materials on a porous base material and providing a self-adhesive layer in a prescribed manner. CONSTITUTION:A laminate material (a) having a coefficient of linear expansion, specified in ASTM D-696, of 15X10<-5>/ deg.C or less and a laminate material (b) having a coefficient of linear expansion greater than 15X10<-5>/ deg.C and containing a tack-reducing compound are laminated at least on one side of a porous base material so that the base material, the laminate material (a), and the laminate material (b) are present in this order in the laminate. A self-adhesive layer is then formed on that surface of the base material where no laminate material is present when the laminate materials (a) and (b) are laminated only on one side of the base material, or formed on any side when the laminate materials (a) and (b) are laminated on both sides of the base material, thus giving a self-adhesive tape or sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive tape or sheet made of a porous base material. More specifically, it provides an adhesive tape or sheet that has excellent unwinding properties even when wound into a roll, allows the tape (sheet) to be stacked, has good oil-based ink writing properties on the back side, and has non-slip properties. It is.

[Prior art/Problems to be solved by the invention] Many adhesive tapes or sheets are known, which are formed by providing an adhesive layer on one side of a support and winding it into a roll, and are suitable for packaging, bonding, masking, etc. It is commonly used.

Usually, paper, cloth, plastic films, etc. are used as the support for the adhesive tape or sheet.

When using a porous base material such as paper or cloth among the supports, at least one surface of the base material is usually coated with high-pressure low-density polyethylene or the like in order to improve the coatability of a release agent, etc. A laminate material is provided as a sealing layer.

In addition, since the adhesive tape or sheet is used by winding it into a roll, in order to adjust the unwinding force appropriately,
A release agent is applied to the sealing layer. Silicone compounds are known as typical release agents. However, when applying a release treatment agent, complicated steps are required: a sealing layer forming step, a release treatment agent application step, and a drying or curing step of the #I# treatment agent.

Further, there are problems such as the need for advanced technology to apply a thin film of the release agent.

In order to solve this problem, a method is known in which a thermoplastic polymer containing a silicone compound is used in the sealing layer. For example, a method of containing radiation-curable silicone and curing the bled silicone with radiation;
There is a method in which a silicone compound that is compatible with polyolefin is contained and the bled silicone is cured by heat treatment.

In this case, only one process is required, but the silicone compound migrates to the surface of the adhesive, impairing its adhesive performance, and may cause problems such as the inability to overlay tapes (sheets), poor writing performance with oil-based inks, and slipperiness. There's a problem.

On the other hand, if the shear modulus specified in JIS K-7213 is 2.0 x 10' dyne/cd or less, JIS
The equilibrium contact angle specified in K-6768 is 55”J,
It is also known that attempts are made to improve the stacking properties of tapes (sheets) and the writing properties with oil-based inks by using a laminate material mainly composed of the ethylene-α olefin copolymer mentioned above.

However, when the main component of the adhesive layer of this type of adhesive tape or sheet is a polymer containing acrylic acid ester as a raw monomer, it has excellent rewinding properties; The reality is that such adhesives do not have good rewinding properties and the laminate material peels off from the base material. This is because -i, adhesives whose base polymer is natural and/or synthetic rubber are softer and more fluid than adhesives whose main component is a polymer whose main monomer is acrylic acid ester, and their adhesion area is smaller. As it becomes wider, the unwinding force increases. Furthermore, the silicone compounds and ethylene-α-olefin copolymers contained in the laminate material diffuse not only onto the surface of the laminate material but also at the interface with the porous base material, resulting in poor adhesion to the porous base material. This is because the strength decreases and it becomes easier to peel off from the base material.

It is an object of the present invention to provide a method for winding up into a roll even when using a porous substrate as a support and using a highly fluid adhesive such as an adhesive having a base polymer of natural and/or synthetic rubber. To provide an adhesive tape or sheet that has good unwinding properties even when turned, allows tapes (sheets) to be stacked, has good oil-based ink writing properties, has non-slip properties, and can form a delamination in one step. That's true.

[Means for solving problems]

As a result of intensive studies to achieve this object, the present inventors found that at least one surface of a porous base material has two layers having different linear expansion coefficients and containing an adhesion-reducing compound on one side, as defined below. Different types of laminate materials are laminated in a certain order, and if the laminate material is laminated on only one side of the porous base material, the laminate material is laminated on both sides of the porous base material on the non-laminated side. If the adhesive tape or sheet has a structure with an adhesive layer on one side, it has excellent unwinding properties even when wound into a roll, can be layered, and can be coated with oil-based ink. It was discovered that it has good writing properties and non-slip properties, and further research led to the present invention.

That is, the present invention provides AST on at least one surface of a porous substrate.
The linear expansion coefficient specified in MD-696 is 15
A laminate material (a) having a temperature of X 10-5/°C or less, and
A laminate material (b) whose coefficient of linear expansion is greater than 15 x 10-'/'c and which contains a tack-reducing compound.
are laminated in the order of base material - laminate material (a) - laminate material (b), and further laminate material (a) - laminate material (b) are laminated only on one side of the base material. The laminate material (a)-
The present invention provides an adhesive tape or sheet characterized in that when the laminate material (b) is laminated on both sides of a base material, an adhesive layer is provided on any one side.

The porous base material used in carrying out the present invention is not particularly limited as long as it is used in this field, and examples thereof include paper such as kraft paper and Japanese paper, cloth such as woven fabric and non-woven fabric,
Examples include a single substance or a composite such as a porous plastic film.

Laminate material (a) used in carrying out the present invention
Examples of the material polymer of (b) include thermoplastic polymers such as polyethylene, polypropylene, polyethylene-polypropylene copolymer, polyethylene terephthalate, and polyvinyl acetate-polyethylene copolymer.

As the laminate material (a), ASTM D-696
A single polymer or a mixture of several types of polymers having a linear expansion coefficient of 15×10 −5 /° C. or less, preferably 11X102 S /−c or less as defined in 1.

On the other hand, the laminate material (b) has a coefficient of linear expansion larger than 15 x 10-'/l, preferably 16
A single polymer or a mixture of several types of polymers having a larger value than X 10-'/l and containing an adhesion-reducing compound described below may be used.

The tack-reducing compound used in the practice of the present invention can be suitably used as long as it is a release agent used in the field. Examples include silicone compounds, long-chain alkyl group-containing compounds, and fluorine compounds. However, the tape (sheet) stacking properties, oil-based ink writing properties,
In order to achieve non-slip properties, compounds containing long-chain alkyl groups are more preferred.

The blending ratio of the material polymer and the tack-reducing compound constituting the laminate material (b) is in the range of 1 to 80 parts by weight, particularly in the range of 10 to 50 parts by weight, of the tack-reducing compound to 1003!1 parts of the material polymer. It is preferable that there be.

If the amount of the tack-reducing compound is less than 1 part by weight, it is difficult to obtain good unwinding properties.On the other hand, if it is more than 80 parts by weight, the mixture with the laminating material polymer becomes poor, making it difficult to form a uniform laminate layer. It becomes difficult to form.

The difference in linear expansion coefficient between the laminate material (a) and the laminate material (b) is l x 1 G-'/'e or more, especially 4
It is preferable that X 10-'/ is or more.

In addition, each laminate material used in the present invention is
Pigments, stabilizers, fillers, crosslinking agents, etc. may be contained within the range that satisfies the above conditions.

The thickness of the laminate material (a) is usually 5 to 50, preferably 8 to 40, and the thickness of the laminate (b) is usually 3 to 50.
50, preferably 5-40.

The composition of the adhesive layer is not particularly limited as long as it can be used in this field, and it usually includes conventionally known adhesives,
Examples include adhesives whose main component is a polymer containing acrylic acid ester as a main monomer, adhesives whose main component is natural and/or synthetic rubber, and the like. Especially (softly)
The effects of the present invention can be significantly obtained when using an adhesive whose base polymer is natural and/or synthetic rubber with high fluidity.

In the adhesive tape or sheet of the present invention, an adhesive layer is usually provided on one side of a porous base material, and laminate materials (a) and laminate materials (b) are laminated on the other side, but depending on the purpose, Each material is laminated on both sides of the base material in the order of laminate material (b) - laminate material (a) - base material - laminate material (a) - laminate material (b), and an adhesive layer is provided on any one surface. The adhesive tape or sheet obtained in this case is in the form of a tape or sheet consisting of the adhesive itself.

In addition, when each material is laminated on both sides of the base material in the order of laminate material (b) - laminate material (a) - base material - laminate material (a) - laminate material (b), the laminate laminated on one side The material (a) and the laminate material (a) laminated on the other side may be made of the same material or different materials as long as the conditions specified in the present invention are satisfied. Of course, the same can be said for the laminate material (b).

As described above (in the adhesive tape or sheet of the present invention, laminate material (a) - laminate material (b)
It is necessary that each material be laminated in this order. If the order of the laminate materials (a) and (b) is reversed, the adhesion between the base material and the laminate material will decrease, making it impossible to obtain good unwinding properties.

The adhesive tape or sheet of the present invention is manufactured by known means, for example, by the following method.

That is, the laminate materials (a) and (b) are laminated onto at least one of the base materials by a method such as extrusion lamination or dry lamination.
Laminate on the surface. At that time, if the base material is heated at 100°C or less, preferably 50 to 70°C, the effects of the present invention can be significantly obtained.Next, if a laminate material is laminated on one side of the base material, On the other hand, when the laminate material is laminated on both sides of the base material, the adhesive tape or sheet of the present invention can be manufactured by applying an adhesive to any one side using a known roll coater or the like. be done.

Examples of methods for incorporating the tack-reducing compound into the laminate material (b) include kneading using a mixing roll, a Banbury mixer, or the like.

The adhesive tape or sheet of the present invention is usually used by winding it into a roll in a paper tube, synthetic resin tube, or the like with the adhesive layer inside.

[Action/Effect]

The effect of laminating two types of laminate materials with different coefficients of linear expansion on a base material in a certain order and incorporating an adhesion-reducing compound in the laminate material with a large coefficient of linear expansion is as follows. That is, since the tack-reducing compound has a lower molecular weight than the laminate material polymer, it diffuses into the laminate material. In particular, by heating and drying to form the adhesive layer, it becomes easier to diffuse. Linear expansion coefficient is 15
In laminate material (b) larger than ×10-'/l,
When heated, it diffuses significantly and bleeds onto the surface of the laminate (b). However, the coefficient of linear expansion is 15 x 1
Since the laminate material (a), which is 0-'7r or less, does not expand as much as the laminate material (b) even when heated, the proportion of the adhesion-reducing compound transferred to the laminate material <a> is small. The compound is a laminate material (a)
It is present in a larger amount in the laminate material (b) than in the laminate material (b). This seems to be because the adhesive force between the tack-reducing compound bled onto the surface of the laminate material (b) and the adhesive is similar to the tensile force during unwinding, resulting in good unwinding.

According to the present invention, it is possible to obtain an adhesive tape or sheet that has good unwinding properties even when wound into a roll only by the laminate material lamination process and without a special peeling process. Further, since the adhesive tape or sheet of the present invention does not undergo a release treatment step, it is advantageous in processability and at the same time can solve the problem of migration of release treatment agent to the adhesive layer. Furthermore, the tape (sheet) stackability,
A novel adhesive tape or sheet having oil-based ink writing properties and non-slip properties can be provided.

〔Example〕

The adhesive tape or sheet of the present invention will be specifically explained with reference to the following examples, and the adhesive tape or sheet of the present invention will have excellent rewinding properties, stacking properties, oil-based ink writing properties,
The fact that it has non-slip properties will be clarified by the following Examples and Experimental Examples.

The present invention is not limited to this example.

In addition, parts in the text mean parts by weight.

Example I 100 parts of low-density polyethylene having a linear expansion coefficient of l 6 x l O-5/°C as defined in ASTM D-696 and 50 parts of a polyethyleneimine octadecyl carbamate release agent were mixed using a mixing roll. Use it to knead and make pellets.

On the other hand, polypropylene having a coefficient of linear expansion of l'l X l O-5/°C is prepared.

The above polyethylene pellets and polypropylene were combined into a polyester fiber base fabric (80 denier, 80 threads x 80 threads).
A support is prepared by laminating the base fabric, polypropylene, and polyethylene pellets in the order of 30 μm each using a two-layer extruder on the side of the paper (1 inch).

On the other hand, an adhesive is prepared by kneading 100 parts of natural rubber having a Mooney viscosity of 30, 90 parts of petroleum-based tackifier resin, 10 parts of liquid softener, 50 parts of calcium carbonate, and 2 parts of anti-aging agent in a pressure kneader.

Next, using a calender roll on the support, the roll surface temperature of the calender roll was set to 120°C and 90°C for the top roll and center roll of the adhesive coating example, respectively.
The temperature is set at 0° C., and the bottom roll on the side where the laminate material is laminated is set at 60° C., and the adhesive is coated with a solid weight of 100 g/application to obtain an adhesive tape wound into a roll.

Comparative Example 1 An adhesive tape was obtained in the same manner as in Example 1, except that the laminate material used in Example 1 was laminated in the order of base fabric - polyethylene pellet - polypropylene.

Comparative Example 2 An adhesive tape is obtained in the same manner as in Example 1, except that the refractory agent used in Example 1 is not contained in polyethylene.

Comparative Example 3 Example 1 except that the polypropylene used in Example 1 was made to contain a '141M treatment agent to form a laminate material (b).
Obtain adhesive tape in the same manner as above.

Comparative Example 4 The polyethylene used in Example 1 was used as a laminate material <a>
An adhesive tape was obtained in the same manner as in Example 1, except that it was used in Example 1.

Experimental Example 1 The adhesive tapes obtained in Example 1 and Comparative Examples 1 and 2 were evaluated for rewinding properties, overlapping properties, oil-based ink writing properties, non-slip properties, and transferability of tack-reducing compounds. ,
The results are shown in Table 1.

The evaluation method is as follows.

[Rewindability]

The resistance force is measured when an adhesive tape stored for 48 hours at 65° C. and 80% relative humidity is unwound at a speed of 60 min/min at 20° C. and 65% relative humidity.

[Stackability]

2 kg of the adhesive tape was placed on the laminate layer side of the adhesive tape stored for 48 hours in an atmosphere of 65°C and 80% relative humidity.
It was pressed with a roller of : 1 adhesive tape layered at a speed of 1+/min
Measure the resistance when peeling off in an 80° direction.

[Writability with oil-based ink]

Write on the laminated layer of the adhesive tape with oil-based ink and observe the degree of repellency.

[Non-slip property]

A dynamic friction coefficient measuring device measures the dynamic friction coefficient between the laminate layers of the adhesive tape. - [Transferability of adhesion-reducing compound] The adhesive tape that was evaluated for stackability is reattached to a stainless steel plate, and the adhesive strength is measured when it is peeled off in the 180'' direction at a speed of 0.3 m/min.

[Margin below]

Table 1 Example 2 Low density polyethylene 10 having a linear expansion coefficient of 18 x 10-5/°C as specified in ASTM D-696
0 parts and 10 parts of an octadecyl acrylate-acrylic acid copolymer release agent were kneaded with a mixing roll and pelletized, and the polyethylene 100
B pellets were prepared by kneading 30 parts of the above-mentioned Y1 release treatment agent in the same manner.

Next, a support was prepared by dry laminating a polyethylene terephthalate film having a linear expansion coefficient of 20 x 10"/'c and a thickness of 10" on both sides of a polyethylene foam sheet having a thickness of 50. On the support,
Using a tandem extruder, the above-mentioned pellets and pellets B were separated into the following order: pellet A - polyethylene terephthalate film - polyethylene foam sheet - polyethylene terephthalate film - pellet B, respectively. A laminated support is prepared with a thickness of .

On the other hand, 60 parts of butyl acrylate, 35 parts of 2-ethylhexylcocrylate, 10 parts of vinyl acetate, and 4 parts of acrylic acid were polymerized in ethyl acetate at 65°C for 10 hours using abbisisobutyronitrile as a polymerization initiator. Prepare adhesive.

Next, on the surface of the support on which the A pellets were laminated,
The adhesive is applied and dried so that the thickness after drying becomes 30 units, and the adhesive is wound into a roll to obtain an adhesive tape.

Comparative Example 5 An adhesive tape was obtained in the same manner as in Example 2, except that polyethylene terephthalate films were laminated on both sides of the foamed polyethylene sheet laminated with the A pellets and Hippeleft used in Example 2.

Comparative Example 6 An adhesive tape is obtained in the same manner as in Example 2, except that the release agent used in Example 2 is not contained in polyethylene.

Experimental Example 2 The rewindability of the adhesive tapes obtained in Example 2 and Comparative Examples 5 and 6 above was evaluated, and the results are shown in Table 2. Note that the evaluation method was the same as in Experimental Example 1.

As is clear from the examples in Table 2 and above, at least one surface of the porous base material has a laminate material ( a) and the linear expansion coefficient is l 5 x l
The laminate material (b), which is larger than O-5/°C and contains a tack reducing compound, is a base material-laminate material (a
) - laminate material (b), and if laminate material (a) - laminate material (b) are laminated only on one side of the base material, on the surface without said lamination,
When the laminate material (a) and laminate material (b) are laminated on both sides of a base material, the unique effects of the present invention can only be obtained when an adhesive layer is provided on any one surface.

Claims (1)

[Claims] (1) ASTM D-6 on at least one side of the porous substrate
The linear expansion coefficient specified in 96 is 15 x 10^-^5
/℃ or less, and the laminate material (b) whose linear expansion coefficient is larger than 15 x 10^-^5/℃ and contains an adhesion-reducing compound are the base material-laminate material (a). ) - laminate material (b), and further laminate material (a) - laminate material (b)
is laminated on only one side of the base material, the laminate material (a) - laminate material (b) is laminated on the non-laminated side.
) is laminated on both sides of a base material, an adhesive layer is provided on any one side of the base material.