JPS5815552A - Composition for adhesion medium - Google Patents

Abstract

PURPOSE:To provide the titled compsn. producing molding products with a smooth surface and a high adhesive power to hydrophilic material and substrate, prepared by adding a diene rubber to a thermoplastic styrene/diene block copolymer. CONSTITUTION:3-30pts.wt. diene rubber is added to 100pts.wt. thermoplastic styrene/diene block copolymer. The dienes are e.g., butadiene and isoprene. The diene rubber includes styrene/butadiene, polyisoprene, natural and acrylonitrile/ butadiene rubbers. When the diene rubber content is less than 3pts.wt., the compsn. shows poor adhesion to hydrophilic material and when it exceeds 30pts.wt., a molding product shows severe plastic deformation and is no longer suitable for practical use. Molding products formed from the compsn. have low-level cold flow and swelling and consequently good dimentional stability and can be bonded readily and strongly to paper, cloth, wood and other hydrophilic materials with a water-soluble adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive medium composition used as an intermediate medium for bonding a hydrophilic substance and a substrate.

When bonding a hydrophilic substance such as paper, wood, or cloth to a base material such as aluminum, iron, or plastic that has poor affinity, it may be sufficient to apply a water-soluble adhesive directly to the base material to bond the two. Adhesive forced questions cannot be obtained. Therefore, in such cases, the common method is to attach a medium to which a water bath adhesive can easily adhere to the base material, and 1- adhere the medium and the hydrophilic substance via a water-soluble adhesive. As the medium, a vulcanized rubber product represented by styrene-butadiene rubber is used.

However, in order to obtain this molded product, it is necessary to go through a vulcanization process, and the equipment for this process is not as simple as a plastic molder, and the production efficiency is low. Moreover, rubber has a large swell when extruded, etc.
Furthermore, the surface texture of the molded product is poor, and furthermore, the adhesion with water-soluble adhesives is not necessarily sufficient.

Therefore, the present inventor conducted research to develop an adhesive medium composition that has good surface texture when molded and also has excellent adhesive strength with hydrophilic substances and base materials. Per 100 parts by weight of diene block copolymer,
The present invention was accomplished by discovering that a composition containing 5 to 30 parts by weight of diene rubber achieves the intended purpose.

As the thermoplastic styrene-diene block copolymer used in the present invention, any of the various previously proposed and commercially available block copolymers can be used. Note that examples of the diene include butadiene and isogrene.

Examples of the diene rubber used in the present invention include styrene-butadiene rubber, polyethylene rubber, natural rubber, acrylonitrile-butadiene rubber, etc.
The amount used is 3 to 30 per 100 parts by weight of the block copolymer.
Parts by weight, preferably 5 to 20 parts by weight. If it is less than 3 parts by weight, the adhesion to the hydrophilic substance is poor, and if it exceeds 30 parts by weight, the molded product will undergo severe deformation and cannot be put to practical use.

The composition of the present invention may further include fillers, stabilizers,
It may contain a tackifier, a lubricant, a pigment, etc. as appropriate. The use of fillers is effective in improving moldability. Specific examples include calcium carbonate, talc, clay, wood flour, etc., and 0 to 100 parts by weight of the block copolymer.
It can be used in an amount of 500 parts by weight, preferably 100 to 300 parts by weight.

Since vulcanization is not necessary in molding the composition, a molded article can be efficiently obtained using simple equipment commonly used for block copolymers. This molded product is cold 70-
Since the swell and swell are extremely small, the dimensional accuracy is high (and it can be easily and firmly bonded to hydrophilic materials such as paper, cloth, and wood using a water bath adhesive).

Therefore, the molded article of the composition of the present invention is extremely effective as a medium for adhering a hydrophilic substance to a substrate with poor affinity.

Next, the present invention will be explained by examples.

12DC15 using an 8-inch roll mill with the ingredients shown in the example table
The mixture was mixed for a minute, formed into a sheet, and passed through a sheet pelletizer to form pellets.

The pellets were processed using a 40 m diameter single screw extruder (screw L/
D=24, O:R=2.5) and extrusion molded into a ribbon shape with a width of 5 m and a thickness of 1 fin. The extrusion molding temperature is cylinder temperature 80-150C and die temperature 80-15C depending on the compounding composition.
Appropriate conditions were selected by appropriately changing the temperature within the range of 0C. The table shows the observation results of the surface smoothness of the molded product at the exit of the die.

Next, this ribbon-shaped molded product is 1w x 30m x 100m
After adhering it to an aluminum plate using a commercially available synthetic rubber adhesive, shoji paper was pasted on the surface that was not adhered to the aluminum using commercially available starch glue for shoji. It was left indoors for 24 hours, and after confirming that the moisture in the glue had evaporated and the shoji paper had completely dried, the adhesive strength was measured.

The results are shown in the table. The results obtained when a commercially available styrene-butadiene-processed product or soft vinyl chloride resin product was used in place of the above-mentioned molded product are also shown.

From the table, it can be seen that the adhesive medium composition of the present invention has a good surface texture when formed into a molded article, and also has excellent adhesion to shoji paper.

*1 Toughprene λ Manufactured by Asahi Kasei Industries *2 Niball 1502 Manufactured by Nippon Zeon *3 Evaluation by intraocular observation

Claims (1)

[Claims] An adhesive characterized in that it contains 6 to 60 parts by weight of diene rubber per 100 parts by weight of the polymerizable styrene-diene block copolymer, and is used as an adhesive medium between a hydrophilic substance and a base material. Composition for medium.