JPH0734047A - Production of base paper for adhesive tape and adhesive tape using the base paper - Google Patents

Abstract

PURPOSE:To obtain a paper adhesive tape which is produced at a low cost without using large facilities and can be regenerated together with a base paper for corrugated board. CONSTITUTION:This production method of a base paper material comprises forming a releasing layer on one side of a clupak kraft paper having a delamination resistance of 100g/15mm or more, a size fastness of 12 second or more and a degree of air permeability of 12 second or more. The clupak kraft paper having a smoothness of 5 second or more is coated with a solventless silicone having a viscosity of 200cps or more at least by 0.3g/cm<2> or more and curing it, and further with the same solventless silicone by 0.3g/m<2> or more and again curing it to form the releasing layer. An adhesive layer is coated on the non- coated side of the clupak kraft paper to produce the objective adhesive paper tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kraft tape for general packaging and a paper base material used therefor, and more particularly to a paper adhesive tape used as a packing tape for sealing a cardboard box. The present invention also relates to a heat-resistant paper adhesive tape having heat resistance.

[0002]

2. Description of the Related Art In conventional paper adhesive tapes, the surface of the paper is subjected to a certain treatment as described below so that a small amount of release agent can be applied effectively and stably. .
If such a treatment is not performed, the peeling effect is not exhibited and it becomes difficult to unwind the tape.

A general craft adhesive tape has a basis weight of 50.
Clupak processed kraft paper of ~ 100 g / m ² is used as a base material, polyethylene is laminated on the base material, and a silicone-based release agent is further applied thereon (recently, an organic release agent is used instead of the silicone-based release agent). An example of applying the agent is also seen), followed by drying, and the surface opposite to the silicone-treated surface of this substrate is subjected to an adhesive treatment, which is wound into a coil. For example, in Japanese Unexamined Patent Publication (Kokai) No. 2-191796, an ethylene resin is extruded on a paper base material and laminated by laminating, and then a thermosetting silicone release agent is applied onto the ethylene resin layer and heat-cured. The release paper thus obtained is disclosed. However, in this case, equipment for polyethylene lamination is required before the normal release processing.

Recently, in order to prevent laminated polyethylene from interfering with the reproduction of cardboard base paper, clay, poval, etc., which can be dissolved / separated with water during cardboard reproduction, can be separated by the weight difference so as not to be polyethylene laminated. There has been proposed a method in which a surface coating treatment is performed with a natural product, and a release treatment is performed on a super calendered product. For example, JP-A-6
Japanese Laid-Open Patent Publication No. 1-65183 discloses a silicone release paper in which an undercoat layer made of polybutadiene is fixed to a super calendered kraft paper, and a silicone release layer is bonded onto the undercoat layer. this is,
Although it can be recycled together with cardboard base paper, it requires significantly larger equipment than polyethylene laminate for coating and supercalendering.

[0005]

As described above, large-scale equipment is required to obtain stable peeling performance. When polyethylene is laminated,
There is a problem that the cardboard base paper cannot be recycled.

An object of the present invention is to provide a paper pressure-sensitive adhesive tape which can be manufactured at low cost without using large-scale equipment and can be recycled together with cardboard base paper.

[0007]

In order to achieve such an object, the method for producing an adhesive tape paper base material of the present invention comprises:
A clupak-processed kraft paper having an interlaminar strength of 100 g / 15 mm or more, a size degree of 12 seconds or more, and an air permeability of 12 seconds or more, and the smoothness of one surface thereof is 5 seconds or more. One side has a viscosity of 200
At least 0.3 g of solventless silicone with cps or more
/ M ² or more is applied and cured, further similar solventless silicone thereon, and forming a release layer is cured by applying 0.3 g / m ² or more.

The paper pressure-sensitive adhesive tape of the present invention is obtained by laminating an adhesive layer on the surface of the paper base material obtained by the above-mentioned production method on which the non-release agent is applied.

The present invention will be described in detail below.

The Krappak processed kraft paper used in the present invention has a basis weight of 50 to 100 g / m ² and an interlaminar strength of 100 g.
/ 15 mm or more, size degree of 12 seconds or more, and air permeability of 12 seconds or more, and the smoothness of the release agent coated surface is 5
If it is more than a second, there is no particular restriction on exposed or unexposed.

In the present invention, the sizing degree of the Kurpac processed kraft paper must be 12 seconds or more.
If the sizing degree of the clupak-processed kraft paper is less than 12 seconds, the hygroscopicity is increased, so that the interlayer strength of the clupak-processed kraft paper is reduced and the strength of the tape as a base material is weakened. In addition, the dimensional stability of the tape as a base material also decreases.

In the present invention, the air permeability of the Clupak-processed kraft paper must be 12 seconds or more. If the air permeability of the Clupak-processed kraft paper is less than 12 seconds, the release agent penetrates into the Clupak-processed kraft paper so much that a large amount of the release agent is required.

In the present invention, it is necessary that the Bekk smooth surface of at least one surface of the Clupak processed kraft paper is 5 seconds or more. If the Beck's smoothness is less than 5 seconds, a large amount of a release agent is required when performing the release treatment, or the adhesiveness between the release agent and the Clupak-processed kraft paper is reduced.

As the silicone used in the present invention, a solvent-free type silicone is used instead of the commonly used solvent-based or water-based silicone. If the viscosity of the solventless silicone at 40 ° C. is 200 cps or more, there is no particular limitation, but the viscosity at 40 ° C. is 200
When it is 0 cps or less, the coating workability is improved, which is more preferable. Moreover, you may add unreactive silicone rubber, silicone resin, silica, etc. as needed.

The above solvent-free silicone is coated on the above-mentioned Krappak processed kraft paper in an amount of 0.3 g / m ² or more and cured, and further applied thereon in an amount of 0.3 g / m ² or more and cured. Thus, by applying a total of 0.6 g / m ² or more, an excellent peeling effect can be obtained. By applying the solventless silicone in two times in this manner, a sufficient amount of the silicone release effect can be obtained with a smaller amount of silicone than in the case of applying only once. In the case of applying only once, the solvent-free silicone was required to be 1 g / m ² or more, whereas in the case of applying it twice or more, 0.6 g was applied.
/ M ² or more is sufficient. Further, according to the above method, the solventless silicone can be applied in three or more times.

In the present invention, an adhesive tape paper base material having one surface subjected to a mold release treatment can be obtained by applying the solventless silicone as described above on the Clupak processed kraft paper. As a result, a sufficient peeling effect can be obtained, and the sealing process and super calendering process which are conventionally required by coating with polyethylene, clay, poval, etc. are not required.

The paper pressure-sensitive adhesive tape of the present invention can be obtained by laminating a pressure-sensitive adhesive layer on the surface of the pressure-sensitive adhesive tape paper base opposite to the silicone-coated surface. That is, the paper pressure-sensitive adhesive tape of the present invention is obtained by applying a pressure-sensitive adhesive to the surface of the pressure-sensitive adhesive tape paper base material opposite to the silicone-coated surface, and drying to form a roll.

The pressure-sensitive adhesive is not particularly limited in type, but examples thereof include rubber-based pressure-sensitive adhesives. But,
When the amount of tape used for the cardboard is large, it is preferable to use a water-soluble pressure-sensitive adhesive so that reproduction can be performed more neatly.

The paper pressure-sensitive adhesive tape obtained in the present invention is suitably used as a general-purpose craft tape. Since the paper pressure-sensitive adhesive tape of the present invention does not contain polyethylene, the heat resistance is improved, so that the paper pressure-sensitive adhesive tape can be preferably used as a heat-resistant paper pressure-sensitive adhesive tape.

[0020]

The polyethylene laminating process required in the ordinary craft tape production process can be reduced, and the super-calendering facility is not required due to the large-scale coating required when polyethylene laminating is not performed.

Since the resulting paper adhesive tape has no polyethylene layer, the tape has improved heat resistance of the substrate. Since the heat resistance is improved, the curing temperature at the time of silicone processing and the drying temperature at the time of adhesive processing can be made higher, and therefore productivity can be improved.

Also for the tape, heat resistance of 200 ° C. or higher can be given by appropriately selecting the kind of the adhesive.

Due to the absence of this polyethylene layer, the resulting paper adhesive tape can be recycled together with the cardboard base paper.

Furthermore, since it does not have a polyethylene laminate, the surface property is very close to that of paper, and it is not possible to develop with ordinary polyethylene laminate kraft tape.
It is possible to add writability with water-based magic and pencil.

Since the surface is roughened by not having the polyethylene laminate, unlike the usual kraft tape, it becomes matte and gives a high-grade feeling.

[0026]

EXAMPLES The present invention will be described below based on examples.

(Example) Basis weight 73 g / m ² , interlayer strength 1
50g / 15mm, size degree 20 seconds, and air permeability 20
On the surface with a smoothness of 15 seconds for kraft paper that has been processed by Kurpack
0.5 g / m ^{2 of} solventless silicone (KUS-316 manufactured by Shin-Etsu Chemical Co., Ltd.) was applied and cured, and then 0.4 g / m ² of the same silicone was applied thereon and cured to form a base material. Obtained. Further, on the surface opposite to the silicone-coated surface, 100 parts by weight of natural rubber TPC-1X as an adhesive, 100 parts by weight of "ALCON P-100" (manufactured by Arakawa Chemical Co., Ltd.) as a tackifying resin, and an antioxidant As a result, 1 part by weight of "Irganox 1010" (manufactured by Ciba-Geigy) and 603 parts by weight of toluene were stirred and dissolved to obtain 15 parts.
A kraft pressure-sensitive adhesive tape was obtained by applying 0 g / m ² and drying to make a roll.

The interlaminar strength of the Clupak processed kraft paper is described in J. TAPPI No. 19-m, the smoothness of the release agent coated surface is JIS P-8119, and the size is J
According to ISP-8112, the air permeability is JIS P-811.
It measured by 7.

The peeling property of the obtained adhesive tape was evaluated by the peeling force when a tape having a width of 50 mm was pulled out at 60 m / min as a developing force.

(Comparative Example 1) A base material was obtained in the same manner as in Example 1 except that the solventless silicone coating method was changed to coating 0.9 g / m ² once and curing. A tape was formed and evaluated.

(Comparative Example 2) A base material was obtained in the same manner as in Example 1 except that the solventless silicone coating method was changed to one coating of 2.0 g / m ² and curing. A tape was formed and evaluated.

(Comparative Example 3) Basis weight 73 g / m ² , interlayer strength 150 g / 15 mm, size degree 20 seconds, and air permeability 2
Low-density polyethylene (LDPE, density 0.923 g
/ Cm ³ , MI 3.7 g / 10 min) was extruded and laminated to a thickness of 15 μm, and 0.7 g / m ^{2 of} solventless silicone (KUS-316 manufactured by Shin-Etsu Chemical Co., Ltd.) was applied and cured to obtain a base material. . Furthermore, on the surface opposite to the silicone coated surface,
As the adhesive, 100 parts by weight of natural rubber TPC-1X, 100 parts by weight of "Alcon P-100" (manufactured by Arakawa Chemical Co., Ltd.) as a tackifying resin, and "Irganox 1010" (Ciba Geigy Co., Ltd.) as an antioxidant. 1 part by weight and 603 parts by weight of toluene were stirred, and the melted material was applied at 150 g / m ² and dried to obtain a kraft adhesive tape. The obtained tape was evaluated in the same manner as in the example.

Comparative Example 4 Basis weight 73 g / m ² , interlayer strength 150 g / 15 mm, size degree 20 seconds, and air permeability 2
100 parts by weight of Poval (manufactured by Kuraray Co., Ltd.) and 10 parts of clay on the surface of the smoothness of the kraft paper that has been processed for 20 seconds with the Kurpack processing for 15 seconds.
10 g / m of a mixture of 0 part by weight and 200 parts by weight of water
To those ² applied and dried, a solventless silicone (Shin-Etsu Chemical Co., Ltd., KUS-316) was 0.7 g / m ² coating, to give a substrate and cured. Further, 100 parts by weight of natural rubber TPC-1X as an adhesive and “ALCON P-100” as a tackifying resin on the surface opposite to the silicone-coated surface.
100 parts by weight (made by Arakawa Chemical Co., Ltd.) and 1 part of "Irganox 1010" (made by Ciba Geigy) as an antioxidant
By mixing 150 parts by weight of toluene and 603 parts by weight of toluene, 150 g / m ^{2 of} the melted material was applied, dried and rolled to obtain a kraft pressure-sensitive adhesive tape. The obtained tape was evaluated in the same manner as in the example.

Comparative Example 5 Basis weight 73 g / m ² , interlayer strength 150 g / 15 mm, size 20 seconds, and air permeability 2
100 parts by weight of Poval (manufactured by Kuraray Co., Ltd.) and 10 parts of clay on the surface of the smoothness of the kraft paper that has been processed for 20 seconds with the Kurpack processing for 15 seconds.
10 g / m of a mixture of 0 part by weight and 200 parts by weight of water
² Coating, drying, super calendering, solventless silicone (KUS-31 manufactured by Shin-Etsu Chemical Co., Ltd.)
0.7 g / m ^{2 of} 6) was applied and cured to obtain a base material.
Furthermore, as an adhesive on the surface opposite to the silicone coated surface,
100 parts by weight of natural rubber TPC-1X and 10 parts of "Arcon P-100" (manufactured by Arakawa Chemical Co., Ltd.) as a tackifying resin.
0 parts by weight and "Irganox 101
0 "(manufactured by Ciba Geigy) and 6 parts of toluene.
Stirring with 03 parts by weight and dissolving the solution, 150 g / m ²
A kraft pressure-sensitive adhesive tape was obtained by coating, drying and rolling. The obtained tape was evaluated in the same manner as in the example. The evaluation results of the obtained kraft adhesive tape are shown in Table 1 below.

[0035]

[Table 1]

The paper pressure-sensitive adhesive tapes obtained in the examples showed good results in all of peeling property, cost, easiness of reproduction, writability, and appearance, as compared with the paper pressure-sensitive adhesive tapes obtained in the comparative examples. .

[0037]

EFFECT OF THE INVENTION In the present invention, the peeling effect can be obtained by applying solvent-free silicone to curpack-processed kraft paper in two separate steps and curing it. Therefore, the coating of polyethylene, clay, poval, etc., which has been conventionally required, can be obtained. Since the sealing process and the super calendering process are not required, it is possible to obtain a paper adhesive tape that can be recycled together with the cardboard base paper by using the conventional kraft paper adhesive tape production equipment.

Claims (2)

[Claims] 1. A clupak processed kraft paper having an interlaminar strength of 100 g / 15 mm or more, a sizing degree of 12 seconds or more, and an air permeability of 12 seconds or more, and one side of which has a smoothness of 5 seconds or more. At least 0.3 g / m ² or more of solvent-free silicone having a viscosity of 200 cps is applied to the one surface of the processed kraft paper and cured, and the same solvent-free silicone is further coated thereon with 0.3 g / m ² A method for producing a pressure-sensitive adhesive tape paper substrate, which comprises forming a release layer by applying and curing the above. 2. A paper pressure-sensitive adhesive tape obtained by laminating a pressure-sensitive adhesive layer on the surface of a paper base material coated with a non-releasing agent, which is obtained by the manufacturing method according to claim 1.