JP3020266U - Adhesive tape - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an adhesive tape that is easy to write and print with a water-based ink, is easy to recycle or discard paper materials, and does not pollute the environment. A paper base material 10 containing a paper strength agent, and an adhesive layer 20 arranged on one surface of the paper base material 10 and containing at least one of a natural adhesive agent and a water-soluble synthetic adhesive agent.
And a surface layer 30 disposed on the other surface of the paper substrate and containing at least one of chitosan, alginic acid, and a water-soluble polymer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a recyclable adhesive tape.

[0002]

[Prior art]

 Heretofore, an adhesive tape made by coating an adhesive on a synthetic resin base material such as cellophane or polypropylene has been known and is widely used for packaging or office work. In addition, an adhesive tape using a kraft paper whose surface is treated with a release agent such as silicon as a base material is also known and is used for packing.

These adhesive tapes are usually distributed in a rolled state. In order to make it easier to remove the adhesive tapes without being joined together even in such a wound state, for example, the above-mentioned cellophane tape is a synthetic resin-based release agent, and the above-mentioned kraft paper adhesive tape is a surface. Then, a peeling process is performed with silicon or the like.

[0004]

[Problems to be solved by the device]

 The conventional adhesive tape has a problem that it is difficult to write characters and the like on the surface thereof with a water-based ink regardless of whether it is made of synthetic resin or kraft paper. This is because if the peeling treatment as described above is performed or if a treatment with a non-adhesive synthetic resin material is used, it becomes difficult to write because the aqueous ink does not adhere to the surface, Even if ink adheres, it does not fix sufficiently, so the characters etc. may be erased by simply rubbing the written characters.

As a writable pressure-sensitive adhesive tape using water-based ink, a pressure-sensitive adhesive having a weak adhesive force was used for the pressure-sensitive adhesive layer so that the surface does not peel off even if the tape base material is ordinary paper. Adhesive tapes for temporary fixing have also been proposed. However, in this case, since the adhesive force is too weak, it cannot be used as an ordinary adhesive tape for fastening. Furthermore, as another problem, the conventional adhesive tape is not suitable for the recycling process. Adhesive tapes are widely used for fastening wrapping paper and office paper, but when these paper materials are collected and recycled, if adhesive tape made of synthetic resin is mixed, it will be recycled. It takes time and cost to remove the synthetic resin component that composes the adhesive tape during the work, and the synthetic resin component is mixed as an impurity in the recycled paper, impairing the quality performance of the paper. Also in the case of the above-mentioned adhesive tape made of kraft paper, since the release agent such as silicon is formed relatively thick, the release agent component is an obstacle to the recycling of the paper material.

[0006] Even when the paper material is incinerated without being reused or buried in the soil and disposed of, if a large amount of the synthetic resin component is contained, the incinerator is damaged or corroded in the soil. It is difficult to dispose of it because it remains without it. Therefore, an object of the present invention is to provide an adhesive tape that is easy to write and print with a water-based ink. Another object is to provide an adhesive tape that is easy to recycle or dispose of paper materials and does not pollute the environment.

[0007]

[Means for Solving the Problems]

 The pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive containing a paper base material containing a paper-strengthening agent and at least one of a natural pressure-sensitive adhesive and a water-soluble synthetic pressure-sensitive adhesive, which is disposed on one surface of the paper base material. An agent layer and a surface layer disposed on the other surface of the paper substrate and containing at least one of chitosan, alginic acid, and a water-soluble polymer.

The paper strengthening agent includes a wet paper strengthening agent composed of at least one of epoxidized polyamide resin, ester of allyl acid, dialdehyde starch, melanin resin, urea resin and polyethyleneimine. be able to. The wet strength agent is preferably an epoxidized polyamide resin. The paper strength enhancer may include a dry paper strength enhancer made of at least one of polyacrylamide resin, polyvinyl alcohol, starch, carboxymethyl cellulose, and urea resin.

The dry strength agent is preferably a polyacrylamide resin. The paper strength enhancer may be added in an amount of 0.015 to 0.3 g / m ^{2 with} respect to the paper base material. The paper substrate may have a basis weight of 10 to 100 g / m ² . The surface layer may include at least one of chitosan and alginic acid.

The surface layer may have a thickness of 1 to 20 μm. The adhesive tape may be wound in a roll shape.

[0011]

[Action]

 Since the adhesive tape of the present invention uses a paper base material as a main material, it can be easily recycled or disposed of together with packaging paper or office paper. Since a paper strength additive is added to the paper base material, it has excellent mechanical strength and durability. The surface layer provided on the surface of the paper base material allows writing and printing with a water-based ink and has good releasability from the adhesive layer. This is because all of the chitosan, alginic acid and water-soluble polymer that make up the surface layer have good writability and high surface strength, and even if the adhesive layer laminated on the surface is peeled off, It is less likely that even the parts will peel off and the paper base material will not fluff.

As a result, it becomes easy to write or print characters or the like on the surface of the adhesive tape with the water-based ink. Conventionally, printing does not appear on the surface of the adhesive tape that has been subjected to the peeling treatment, so it was necessary to print on the surface of the paper substrate before performing the peeling treatment. For this reason, printing on a small amount of adhesive tape according to the application was troublesome and costly. Specifically, this is the case when the user wants to print the user's store name, advertising message, etc. on the surface of the adhesive tape when using it for packaging.

Moreover, even when the adhesive tape of the present invention is put on the market for distribution in a rolled-up state, the adhesive tape can be easily peeled off and used favorably in use. Among the materials that make up the surface layer, chitosan and alginic acid are made from natural products, so they are easily biodegraded, and there is no concern of polluting the natural environment compared to conventional synthetic resin strippers, and there is no problem in recycling. Nor. In addition, since the water-soluble polymer also dissolves in water during the recycling process, there is no problem in recycling the paper substrate.

When the paper strength enhancer is the specific wet paper strength enhancer as described above, sufficient strength and durability can be maintained even when the adhesive tape is used in a high humidity environment. If the wet paper strength enhancer is an epoxidized polyamide resin, the above-mentioned effects are high. When the paper strength enhancer is the specific dry paper strength enhancer as described above, the strength and durability of the adhesive paper preparation in the dry environment can be increased. In particular, if it is a polyacrylamide resin, the above-mentioned effects are enhanced.

When the paper strength enhancer is added in an amount of 0.015 to 0.3 g / m ^{2 with} respect to the paper base material, the effect of improving the strength and durability of the paper strength enhancer is enhanced. When the paper base material has a basis weight of 10 to 100 g / m ² , it can exhibit appropriate strength, durability, flexibility and handleability as an adhesive tape. When the surface layer is in the thickness range, it is possible to prevent the permeation of the pressure-sensitive adhesive into the paper substrate satisfactorily, and to exhibit the above-described effects of the surface layer satisfactorily.

If the adhesive tape is wound in a roll shape, it is convenient for transportation storage and sales distribution and easy to use. Moreover, even when wound in a roll shape, the adhesive tapes do not adhere to each other, and the adhesive tapes can be easily pulled out from the ends and used.

[0017]

【Example】

 In the adhesive tape T shown in FIG. 1, the adhesive layer 20 is arranged on one surface of the paper base material 10 as a main material, and the surface layer 30 is arranged on the other surface. As the paper base material 10, both Japanese paper and foreign paper can be used. The type of pulp used as a raw material for paper is not particularly limited. The types of trees used as pulp include, for example, fir, veiled fir, Todo pine, shirabe, cypress, sawara, cedar, larch, red spruce, spruce, black pine, spruce, red pine, black pine, oyster, kaya, Conifers of hemlock, bay fir, pea oceder, alaska cedar, redwood and hemlock; hardwoods of cottonwood, aspen and tasmanian oak; bamboo, bacas and other plants of straw. Among them, pulp obtained from softwood has the longest fiber and is a tough paper, which is preferable.

A paper strengthening agent is added to the paper base material 10. The paper-strengthening agent is not particularly limited, and examples thereof include a wet paper-strengthening agent containing an epoxidized polyamide resin, an acrylic ester, a dialdehyde starch, a melanin resin, a urea resin, a polyethyleneimine; a polyacrylamide resin, a polyvinyl alcohol. , Starch, carboxymethyl cellulose, urea resin, and other dry paper strengthening agents. By using a wet strength agent and a dry strength agent selected from these in combination, it is tough, has excellent wet strength and surface strength, and it is strong in both wet and dry conditions. Will increase. Among the wet strength agents, epoxidized polyamide resin is preferable, and among the dry strength agents, polyacrylamide resin is preferable. Epoxidation By using a polyamide resin and a polyacrylamide resin together, the tension can be increased without hardening the paper base material 10.

The paper base material 10 may contain a sizing agent. The sizing agent has an advantage that the surface layer 30 made of chitosan or the like can be applied more easily and the amount used can be reduced. As the sizing agent, the sizing material used in ordinary paper manufacturing is used. The method of adding the paper strength enhancer to the paper base material 10 is not particularly limited. For example, a method of adding a paper strength enhancer or a sizing agent to pulp in a state of being dispersed in water, and then making paper. Examples include a method of impregnating the paper base material 10 obtained by making paper from pulp with a solution containing the agent, or a method of applying the solution with a coating machine. The method of impregnation or coating with a coating machine may be applied to the paper base material 10 that is already a tape. Above all, it is preferable to add each agent to pulp in a state of being dispersed in water and then perform papermaking, which does not require a special step and can uniformly add each agent.

The amount of the paper-strengthening agent used is not particularly limited, but 0.015 to 0.3 g per 1 square meter is preferably attached to the paper substrate 10. If the amount of the paper strength enhancer used is less than 0.015 g / m ² , sufficient wet strength cannot be imparted to the paper base 10, and it is difficult to apply the surface layer 30 to the paper base 10. Is. If the amount of the paper-strengthening agent used exceeds 0.3 g / m ² , the resulting paper becomes hard and difficult to use.

The basis weight of the paper base material 10 is not particularly limited, but normally a base weight of 10 to 100 g / m ² is used. If it is less than 10 g / m ² , sufficient working strength cannot be maintained. When used as a document stopping tape or the like, a paper base material 10 in the range of 10 to 35 g / m ² is preferable. When used as a packing tape or the like, a paper base material 10 in the range of 35 to 100 g / m ² is preferable.

The adhesive layer 20 contains a natural adhesive or a water-soluble synthetic adhesive. The adhesive is preferably acid-free. Specific examples of the pressure-sensitive adhesive include water-soluble acrylic resin, PVA, vinyl acetate emulsion, natural rubber, starch, pineapple, dextrin, glue and casein. For the surface layer 30, chitosan, alginic acid, or a water-soluble polymer is used. Specifically, for example, it is formed by coating or impregnating carboxymethyl chitosan (water-soluble). The thickness of the surface layer 30 is set to about 8 μm. PVA can be used as the water-soluble polymer.

As described above, the pressure-sensitive adhesive tape T having the pressure-sensitive adhesive layer 20 and the surface layer 30 respectively arranged on the front and back surfaces of the paper base material 10 is used after being cut into appropriate dimensions according to the application. It The adhesive tapes T are placed on top of each other for distribution and sale. In the adhesive tape T shown in FIG. 2, the adhesive tape T cut into a thin strip is wound around a core tube 40 made of cardboard or the like in a roll shape. The pressure-sensitive adhesive layer 20 of the tape T arranged on the outer peripheral side is wound on the chitosan layer 30 of the tape T arranged on the inner peripheral side.

As a method of manufacturing the adhesive tape T, the adhesive layer 20 and the chitosan layer 30 are formed in advance in a state where the paper base material 10 is cut into a band-shaped tape, and the obtained band-shaped adhesive tape is obtained. It can be manufactured by winding T in a roll shape. Further, the adhesive tape T manufactured in a wide sheet shape may be cut into a strip shape and wound into a roll shape. A specific manufacturing process of the adhesive tape T may be a combination of manufacturing processes similar to those of a normal adhesive tape.

The width and winding length of the adhesive tape T can be appropriately set according to the intended use. Usually, the tape width is about 10 to 100 mm.

[0026]

[Effect of device]

 Since the pressure-sensitive adhesive tape of the present invention comprises the paper base material, the pressure-sensitive adhesive layer, and the surface layer as described above, it has sufficient basic functions as a pressure-sensitive adhesive tape, and at the same time, the surface layer makes In addition, writing and printing can be easily performed with a water-based ink. In addition, it is easy to recycle (recycle) or dispose of and has a low environmental impact. Even if a strong adhesive is used for the adhesive layer, the stacked adhesive tapes can be easily peeled off from each other, making it particularly suitable for applications requiring a strong adhesive function such as packing tape.

When the wet strength agent or the dry strength agent is used as the strength agent, the strength, durability and water resistance of the adhesive tape in a wet or dry environment can be improved. it can. If the paper strength enhancer is added in an amount of 0.015 to 0.3 g / m ^{2 with} respect to the paper base material, the effect of improving the strength and durability of the paper strength enhancer is enhanced.

When the paper base material has a basis weight of 10 to 100 g / m ² , the adhesive tape has excellent practicability such as strength, durability, flexibility and handleability. When the surface layer is in the above-mentioned thickness range, the permeation of the pressure-sensitive adhesive into the paper base material can be favorably prevented, and the function and effect of the surface layer can be favorably exhibited. If the surface layer contains chitosan or alginic acid, since these materials are natural materials, they can be easily recycled and disposed of, and environmental pollution is small.

If the adhesive tape is wound in a roll shape, it is convenient to handle and the adhesive tape can be easily pulled out from the end for use.

[Brief description of drawings]

FIG. 1 is a sectional view of an adhesive tape showing an embodiment of the present invention.

FIG. 2 is a perspective view of an adhesive tape using the adhesive tape of FIG.

[Explanation of symbols]

 10 Paper Base Material 20 Adhesive Layer 30 Surface Layer T Adhesive Tape

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C09J 7/04 JKS

Claims (10)

[Scope of utility model registration request] 1. A paper base material containing a paper strength enhancer, and an adhesive layer disposed on one surface of the paper base material and containing at least one of a natural adhesive and a water-soluble synthetic adhesive. A pressure-sensitive adhesive tape comprising: a surface layer disposed on the other surface of the paper substrate, the surface layer containing at least one of chitosan, alginic acid, and a water-soluble polymer. 2. The paper-strengthening agent contains a wet paper-strengthening agent comprising at least one selected from an epoxidized polyamide resin, an acrylic ester, a dialdehyde starch, a melanin resin, a urea resin, and a polyethyleneimine. The adhesive tape according to claim 1. 3. The adhesive tape according to claim 2, wherein the wet strength agent is an epoxidized polyamide resin. 4. The dry strength agent according to claim 1, wherein the strength agent contains a dry strength agent made of at least one of polyacrylamide resin, polyvinyl alcohol, starch, carboxymethyl cellulose and urea resin. Adhesive tape as described. 5. The adhesive tape according to claim 4, wherein the dry paper strengthening agent is a polyacrylamide resin. 6. The paper strengthening agent is 0.0 with respect to a paper substrate.
The adhesive tape according to any one of claims 1 to 5, wherein 15 to 0.3 g / m ^{2 is} added. 7. The adhesive tape according to claim 1, wherein the paper substrate has a basis weight of 10 to 100 g / m ² . 8. The surface layer contains at least one of chitosan and alginic acid.
The adhesive tape according to any one of 1. 9. The adhesive tape according to claim 1, wherein the surface layer has a thickness of 1 to 20 μm. 10. The adhesive tape according to claim 1, wherein the adhesive tape is wound in a roll shape.