JPH0978044A - Tacky agent composition and tacky tape or sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition eliminating or reducing deterioration of working environment by malodor by blending a deodorant into a tacky agent composition including natural rubber as a base material within a range of the composition having tacky property and imparting odorless or odor- suppressing property to the composition. SOLUTION: The objective tacky agent composition provided with odorless or odor-suppressing property and capable of eliminating or reducing deterioration of working environment by malodor and usable as a tacky tape or a sheet, etc., or also for packaging of a medicine or a food, etc., is obtained by using natural rubber as a base material and blending a tackiness-imparting resin to make a tacky agent composition and further adding one or plural kinds of deodorant containing at least one kind of a material having adsorbing property such as activated carbon, silica gel or zeolite to the tacky agent composition within a range the composition having tacky property, then kneading with a kneader.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pressure-sensitive adhesive composition capable of removing or reducing the deterioration of working environment due to a bad odor, and a pressure-sensitive adhesive tape or sheet produced by using the composition.

[0002]

2. Description of the Related Art Adhesives and adhesive tapes obtained by coating various base materials have various excellent properties, and thus have been widely used by industry and general consumers. It has been. However, the pressure-sensitive adhesive product based on natural rubber has an odor peculiar to natural rubber, which causes a bad working environment due to a bad odor during the production and use of the pressure-sensitive adhesive and the pressure-sensitive adhesive tape. Further, the above-mentioned products have a wide range of applications such as being used for packaging medical products and foods, and deodorants are added to synthetic rubber-based adhesives to reduce odors (for example, Japanese Patent Laid-Open No. -170575), however, we have found a product that has excellent adhesive properties and is odorless or has excellent deodorant properties as a product based on natural rubber, which has a stronger odor than synthetic rubber. It has not been.

[0003]

Since the adhesive product based on natural rubber is flexible and can be applied thickly, it can be easily attached even on a rough surface. For example, a packaging cloth which is an adhesive tape unique to Japan. Widely used as an adhesive tape. Adhesives based on natural rubber have excellent performance, but have an odor peculiar to natural rubber, which causes a bad working environment due to a bad odor during the production and use of the adhesive and the adhesive tape, There is a problem that an odor is attached when used for packaging medical products, foods, etc., and there is a strong demand for deodorizing or imparting deodorant properties to the adhesive tape.

[0004]

[Means for Solving the Problems] The above-mentioned problem is that in a pressure-sensitive adhesive composition based on natural rubber, a deodorant is blended in an amount or composition range in which the pressure-sensitive adhesive composition can sufficiently exhibit adhesive properties. Can be solved by As the deodorant to be blended, any substance having adsorption ability can be used, but since it is added to the pressure-sensitive adhesive composition, desirably,
Powder of activated carbon, silica gel, zeolite, etc. is preferable. Also, these deodorants may be added alone,
You may add 2 or more types. An appropriate amount of the deodorant compounded is 10 to 200 parts by weight based on 100 parts by weight of natural rubber.

The above-mentioned problems can be solved by using the above-mentioned pressure-sensitive adhesive composition as a pressure-sensitive adhesive tape or pressure-sensitive adhesive sheet coated on a substrate such as cloth, paper or film.

To add a little supplementary explanation, when a natural rubber-based pressure-sensitive adhesive composition is produced, a large amount of calcium carbonate powder or the like is generally added in order to facilitate kneading. It can be expected that even if some or all of the above is replaced with the deodorant powder, the adhesive properties are hardly changed. In fact, powders of activated carbon, silica gel, zeolite, etc. could be blended in place of the calcium carbonate powder to obtain a pressure-sensitive adhesive composition having almost the same characteristics.

In the pressure-sensitive adhesive composition containing the deodorant as described above, it is possible to significantly reduce the deterioration of the working environment due to the bad odor during production. Further, by coating the pressure-sensitive adhesive composition on a substrate such as cloth or paper or a film, it is possible to impart odor eliminating property or deodorant property even when the pressure-sensitive adhesive product is used, and thus medical products and foods. It is possible to obtain a pressure-sensitive adhesive product that can be used for packaging such as.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in more detail below. However, the present invention is not limited to the scope of these examples.

[0009]

First Embodiment 100 parts by weight of natural rubber, 100 parts by weight of tackifying resin, 170 to 200 parts by weight of calcium bicarbonate (variable amount), 0 to 30 parts by weight of zeolite (variable amount), process oil 5
A composition consisting of 0 parts by weight and 2 parts by weight of an anti-aging agent was kneaded using a kneader to prepare 4 kinds of pressure-sensitive adhesive composition samples. Applied to. Physical properties of the obtained adhesive tape were measured by the following methods. (Physical property measurement method) Adhesive force: JIS-Z-0237 Tack: JIS-Z-0237 (Inclined ball tack method, using steel balls with a diameter of 1/32 to 32/32 inches, and a ball No.
Retention force: JIS-Z-0237 (however, load at 40 ° C
1000gf ) Sensory test: In a sensory test by 20 panelists, each panelist evaluated the presence or absence of a specific odor and its degree on each sample on a three-stage scale, and the evaluation score with the largest number of people was indicated.

●: No odor ○: Almost no odor ×: Peculiar odor Table 1 shows the results of the composition of the adhesive composition sample and the measured physical properties.

[0011]

[Table 1]

From the results in Table 1, 10 parts by weight of zeolite,
It can be seen that the peculiar odor can be suppressed by replacing with calcium bicarbonate.

Claims (4)

[Claims] 1. A natural rubber-based pressure-sensitive adhesive composition containing one or more deodorizing agents within a range in which the pressure-sensitive adhesive composition exhibits adhesive performance, thereby deodorizing or deodorizing the composition. A pressure-sensitive adhesive composition characterized by being applied. 2. The pressure-sensitive adhesive composition according to claim 1, wherein the deodorant is a deodorant containing at least one substance having an adsorbing ability such as activated carbon, silica gel, or zeolite. 3. A pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition containing 10 to 200 parts by weight of the adsorbent according to claim 2 with respect to 100 parts by weight of an elastomer. 4. A pressure-sensitive adhesive tape or sheet obtained by coating the pressure-sensitive adhesive composition according to claim 1 on a substrate such as cloth, paper or film.