JPH04220478A - Biodegradable pressure-sensitive adhesive tape and its production - Google Patents

Abstract

PURPOSE:To provide a biodegradable pressure-sensitive tape which is used in farm working for fruit culture and horticulture, can easily bind branches or stems to a rack frame or a support, and is biodegradable into soil when abandoned at a farm land. CONSTITUTION:The title tape is produced by coating one side of a biodegradable tape base with an aqueous solution of a water-soluble coating material or a mixture of an emulsion of a natural resin with an emulsion of a releasable resin, or with an aqueous solution of a water-soluble coating material or an emulsion of a natural resin, drying the applied emulsion, coating the formed film with a releasable resin to form a release layer, coating the other side of the base with a pressure-sensitive adhesive, and cutting the resulting base into a suitable width.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape for use in agricultural work such as growing fruit trees and gardening.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 3, in agricultural work such as fruit growing and gardening, branches a of fruit trees are tied to shelf frames b,
Branches and stems (a) of garden crops are often fixed to supports (b), and it has been common practice since ancient times to tie them together using straw ropes or palm ropes (c) as shown. Since these straw ropes and palm ropes are natural products, the advantage is that even if they are disposed of on farmland after use, they will biodegrade, that is, they will be broken down by bacteria and assimilated into the soil, so there is no need to worry about harming the farmland. be. however,
These require a great deal of effort and time to tie, which is one of the worries of farmers.

One possible solution to this problem is to surround the bundled portion with an adhesive tape having an appropriate strength with the adhesive surface facing inside, paste the adhesive tape at the end with the adhesive surfaces facing each other, and then cut the tape at an appropriate location.

0004

[Problem to be solved by the invention] However, this type of adhesive tape is generally made of synthetic resin such as vinyl chloride, polypropylene, or polyester, and even if it is made of cloth or paper. , Synthetic resins such as polyethylene and polyurethane are used for the release layer on the back, so these synthetic resins do not decompose in the ground and remain for a long time, so if they are disposed of on cultivated land after use, they will be a problem. It was necessary to collect it, which was time-consuming.

[0005]

[Means for solving the problem] A means for solving the above problem is to apply a mixture of an aqueous solution of a water-soluble coating material or an emulsion of a natural resin and an emulsion of a releasable resin to one side of a biodegradable tape base material. Either apply a solution and heat and dry cure to form a release layer, or apply an aqueous solution of a water-soluble coating material or an emulsion of a natural resin to one side of the base material and dry it, then apply a release resin on the upper surface. This method involves applying an emulsion to form a release layer, then applying an adhesive to the other side of the base material to provide an adhesive layer, and then cutting this into an appropriate width.

[0006]

[Example] An example of the adhesive tape of the present invention will be explained based on the drawings.

[0007] The tape base material 1 is made of biodegradable material, ie, cloth, nonwoven fabric, paper, etc. that can be decomposed by bacteria, and a liquid mixture that will become the release layer 2 is applied to one side of the base material 1, or Either an aqueous solution or an emulsion is applied, a peeling treatment is performed thereon, and then an adhesive that will become the adhesive layer 3 is applied to the other surface of the base material 1.

[0008] In order to promote biodegradability, it is advantageous to treat this tape base material 1 with a biodegradability promoter such as chitosan.

The release layer 2 is formed by applying an aqueous solution of a water-soluble coating material or a mixed solution of a natural resin emulsion and a release resin emulsion to one side of the tape base material 1, and heating and drying and curing it; It is formed by coating an aqueous solution of a water-soluble coating material or an emulsion of a natural resin, drying it, and then coating the top surface with a releasable resin.

This water-soluble coating material includes polyvinyl alcohol, polyoxytylene, sodium polyacrylate, starch, carboxymethyl cellulose (C.M.C.), methyl cellulose, etc., and aqueous solutions of these are used.

[0011] Natural resins include rosin and terpene, and emulsions of these resins are used.

Further, the release resin is silicone, fluororesin, etc., and this emulsion is used.

Either an aqueous solution of these water-soluble coating materials or an emulsion of a natural resin and an emulsion of a release resin are used as a mixed solution, or an aqueous solution or a natural resin emulsion of the coating material is used alone, and then a release resin emulsion is used. It is also possible to use emulsions.

The adhesive layer 3 is formed on the opposite side of the release layer 2, and is coated with a biodegradable material such as rubber.

[0015] As shown in Fig. 2, the tape having such a structure is placed between branches, stems, etc. (a) and supports, etc. (b), with the adhesive layer 3 on the inside.
The adhesive layers are pasted together and fixed.

Next, specific embodiments of the present invention will be described in detail. Example 1 Chitosan treated 100% rayon non-woven fabric (32
g/cm2) as a base material, apply the following mixed solution on the surface, dry it, cure it at about 130℃ for 1 minute, then apply a natural rubber adhesive on the back side, and after drying, 50mm
I made a tape by cutting it to the width of . 23% aqueous solution of Poval 105
100.0 copies
X-52-165
25.0
Part Same as above catalyst

1.5 parts water

25.0 copies
*Poval 105: - Polyvinyl alcohol manufactured by Kuraray X-52-165
: Shin-Etsu Chemical - Silicon emulsion

Example 2 The procedure was the same as in Example 1 except that the following mixture was used. Aron A-20LL
100.0
Section Aron A-20P

2.0 parts X-52-165

25.0 parts Same as above catalyst

1.5 parts water

25.0
*Aron A-20LL: Sodium polyacrylate manufactured by Toago Chemical Industry Co., Ltd.
Aqueous solution Aron A-20P:
Powdered sodium polyacrylate manufactured by the company

Example 3 The procedure was the same as in Example 1 except that the following mixed solution was used. First, a glue is prepared in a ratio of 5 parts cornstarch to 35 parts water. cornstarch glue
100.
Part 0 X-52-165

15.0 parts Same as above catalyst

0.9 parts water

15.0 copies

0
Example 4 In place of the mixed solution of Example 1, Chiccolate G-
150 (C.M.C. manufactured by Nichirin Chemical Industry Co., Ltd.) was applied and dried, 3.00 parts of X-52-165 and 0 parts of the same catalyst were added.
．． An emulsion containing 18 parts of water and 3.00 parts of water was applied, and the other conditions were the same as in Example 1.

Example 5 Metrose 65SH4 was used in place of Kykkolate in Example 4.
Using 000 (Methylcellulose manufactured by Shin-Etsu Chemical Co., Ltd.),
The rest is the same as in Example 4.

Example 6 The corn starch paste of Example 3 was used in place of the kyccholete of Example 4, and the other conditions were the same as in Example 4.

As described above, the tapes prepared in Examples 1 to 6 were mixed with fertilized soil in a planter, left exposed to nature, and subjected to a rot test. As a result, although there was a slight difference in slowness, none of the tapes rotted. Most of them were disassembled within six months. By the way, ordinary rayon 100% non-woven fabric is 1
It took several years.

[0023]

[Effects of the Invention] The tape manufactured by the above-mentioned method of the present invention is extremely easy to bind in agricultural work, and by mechanizing it, efficiency can be further improved, making a great contribution to saving time and labor. I can do what I can.

[0024] Furthermore, even if this tape is left as it is on cultivated land after use, it will dissolve into the ground because the release layer uses a water-soluble coating material or natural resin as a base, as mentioned above. In addition, the adhesive is biodegradable such as rubber, and the base material is of course biodegradable cloth,
Since it is made of nonwoven fabric or paper, it does not harm cultivated land.

Furthermore, by treating the base material with a biodegradability accelerator such as chitosan, which promotes biodegradability, it can be decomposed in a short period of time and assimilated into the soil, making it even more effective.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the adhesive tape of the present invention.

FIG. 2 is an explanatory diagram of the state of use.

FIG. 3 is a conventional explanatory diagram.

[Explanation of symbols]

Claims (3)

[Claims] 1. A biodegradable adhesive tape comprising a biodegradable tape base material, provided with a water-soluble or degradable release layer on one side, and a biodegradable adhesive layer on the other side. [Claim 2] An aqueous solution of a water-soluble coating material or a mixed solution of a natural resin emulsion and a release resin emulsion is applied to one side of a biodegradable tape base material, and a release layer is formed by heating and drying and curing. After that, a pressure-sensitive adhesive is applied to the other side to form a pressure-sensitive adhesive layer, and then this is cut into an appropriate width. [Claim 3] An aqueous solution of a water-soluble coating material or an emulsion of a natural resin is applied to one side of a biodegradable tape base material and dried, and an emulsion of a release resin is applied to the upper surface to form a release layer. After that, a pressure-sensitive adhesive is applied to the other side to form a pressure-sensitive adhesive layer, and then this is cut into an appropriate width.