JPH0689310B2 - Temporary adhesive containing microcapsules - Google Patents

Description

Detailed Description of the Invention

 Purpose of the invention

[Industrial applications]

The present invention relates to a temporary adhesive containing microcapsules encapsulating a fragrance or the like. This temporary adhesive is suitable for producing magazines and pamphlets that emit an aroma by opening the pages to which they are attached.

[Prior art]

It is known that microcapsules encapsulating fragrances, dyes, deodorants, liquid crystals, etc. are printed or applied on the surface of the paper, and the parts are rubbed strongly to break the microcapsules and give off aroma. There is. There is also one in which two papers coated with microcapsules are pasted together with an adhesive so that an aroma is emitted when the paper is peeled off. However, conventional adhesives have too high an adhesive strength and are difficult to peel off. Attempts have been made to obtain an appropriate peel strength by applying an adhesive in the form of halftone dots and controlling the area ratio, but even if it is only partial, the base material is destroyed by peeling, so-called "paper". "Muke" occurs. This is of course the case where the substrate is a printed matter,
Even if it is not, it is not preferable because it spoils the aesthetics. Therefore, it is also possible to dry the adhesive until it becomes "dry", reduce the adhesive strength, and then use it by bonding it to the opposing paper. Obtaining the product is difficult. It has been proposed to use wax as a temporary adhesive that is easy to peel off and does not cause "paper sticking". If the wax is temporarily adhered, the base material will not be destroyed because peeling proceeds due to cohesive failure. However, the adhesive force of the wax is weak, and the peel strength is 20 g / inch (T-shaped peeling, peeling speed 10
0mm / min, 25 ° C, humidity 50%) is normal,
There is a risk that the adhesive may peel off during the transportation or bookbinding of the temporary adhesive. In addition, when the ambient temperature is high such as in summer, the wax may melt and spoil the appearance of the product.

[Problems to be Solved by the Invention]

The object of the present invention is to improve the current state of the art described above, to have a strong adhesive force to the extent that the adhesive does not peel off when handling the temporary adhesive body, while in the adhesive layer without breaking the substrate. It is an object of the present invention to provide a temporary adhesive containing microcapsules, which has a weak adhesive force such that it can be peeled off by cohesive failure. Structure of the invention

[Means for solving problems]

The temporary adhesive containing microcapsules of the present invention is formed by mixing microcapsules using a foreskin material having an adhesive function and particles of a release agent having a particle size smaller than the particle size of the microcapsules. The contents to be encapsulated in microcapsules are fragrances, dyes,
It is needless to say that two or more kinds of microcapsules having different contents may be used together, and two or more kinds of microcapsules may be used in combination, such as a deodorant and a liquid crystal. If desired, the contents of the microcapsules may be used by impregnating or adsorbing them on a carrier of various porous materials, typically silica gel or activated carbon. Zirconium phosphate complex is a suitable porous material for this purpose. The first group of microcapsule foreskin material having adhesive function is a water-soluble polymer substance typified by gelatin, glue, and cyclodextrin. The technique of forming microcapsules from this type of material is known as the coacervation method. The second group of the microcapsule foreskin material is, as typical examples of various synthetic resins and rubbers, viscenol A, acrylic resin, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, chloroprene rubber,
Examples include urethane rubber, polyester, alkyd resins and nitrocellulose. These are suitable when the above-mentioned carrier of the porous material is used. The release agent used in the present invention means, in short, a substance which easily causes cohesive failure of itself upon peeling. Commonly used silicone emulsions, silicone rubber oils, Teflon emulsions, Teflon rubber oils, wax emulsions, waxes and the like can be used, but it is necessary to select the grade in relation to the particle size of the microcapsules. The temporary adhesive of the present invention, which is a mixture of microcapsules and a release agent, can be applied in any pattern on any substrate such as paper. For example, first
As shown in the drawing, the microcapsule-containing temporary adhesive 1 is applied to the left side piece 2A from the folding line 3 of the paper 2 in a pattern composed of a combination of a rectangle and a heart shape, folded at the folding line 3 and the other piece 2B is applied. Overlap, crimp and air dry. This work can be performed in-line using, for example, the device having the configuration shown in FIG. That is, after the desired printing is performed in the printing unit 5 on the paper 2 unwound from the winding and dried through the dryer 6,
The above-mentioned printing is performed by the temporary adhesive pattern coating unit 7. Then, using the folding roll 8, a predetermined folding line 3
The paper is folded along the line and cut by the cutting unit 9. The temporary adhesive body thus obtained can be subsequently peeled off as shown in FIG.

[Work]

FIG. 3 is a schematic cross-sectional view of the one bonded with the microcapsule-containing temporary adhesive. The peeled state is as shown in FIG. In the figure, 11 is a microcapsule, and 12 is a release agent particle. The particle size of the microcapsules is generally in a wide range of 0.5 to 80 µ, but in the present invention, a relatively large diameter, typically 30 to 50 µ is suitable. On the other hand, as the particles of the release agent, those having a smaller diameter, preferably a fraction to a few tenths, are used. Therefore, the diameter is selected from the range of 0.0001 to 10μ, preferably 0.0001 to 0.1μ. With such a combination of particle sizes, small release agent particles can enter between the large microcapsules and form a film there, thus exhibiting cohesive failure. On the other hand, some of the microcapsules directly adhere to the paper and also adhere to each other, so that the strength of the temporary adhesive layer is made larger than the mere cohesive failure strength of the release agent. This is the reason why the temporary adhesive of the present invention has a peel strength (50 to 500 g / inch) larger than that of the conventional wax (20 to 30 g / inch). If the particles of the release agent have a size comparable to that of the microcapsules, such an effect cannot be expected,
Adhesive strength becomes high, causing “paper waste”. The formulation of the temporary adhesive containing microcapsules is selected from the range of microcapsules: release agent = 10 to 95:90 to 5 (weight ratio). If the amount of the releasing agent is too large, the adhesive strength will be insufficient, and if it is too small, the peeling due to the cohesive failure cannot be expected. As will be understood from the explanation given above, the adhesive strength is affected not only by the mixing ratio of the microcapsules and the release agent, but also by the particle size ratio of the two, and the larger the particle size ratio, the better the adhesive strength. Easy to control. When the difference in particle size is small, the adhesive strength rapidly increases due to the mutual adhesion of the microcapsules unless the releasing agent is present in a relatively large amount. However, if a large amount of a release agent is applied, the adhesive strength will remain low and it will be difficult to obtain an appropriate value. Particle size
The particle size of the release agent is 0 for microcapsules of 10 to 30μ.
If the particle size is 1 to 1 μm, the adhesive strength does not become excessive if it is at least 17%. On the other hand, if the particle size is 5 to 10 μm, it is necessary to add 40% or more.

Example 1 Benzaldehyde (perfume ingredient) was used as microcapsules (particle size: 10 to 30 μ) of gelatin foreskin. Silicone emulsion "LE46" (Nippon Unicar, particle size 0.1
~ 1μ) was used to prepare the following ink composition. Microcapsules 78% (by weight) Silicone emulsion 17 Sodium alginate (thickener) 5 By the device shown in Fig. 5, coated paper "Diacoat"
(Jujo Paper Co., Ltd., weight 46 edition / 10Kg)
After folding, the printed matter shown in FIG. 1 was obtained and naturally dried. The adhesive strength of this temporary adhesive is about 200 g / inch (T-shaped peeling,
Immediately 100 mm / min, humidity 50%), this value is at room temperature (25
It did not change when stored at high temperature (80 ° C) as well as at 0 ° C. When the peeled surface after T-shaped peeling was observed, peeling occurred between the gelatin wrap of the microcapsules and the silicone film, and it was confirmed that some of the microcapsules were broken and aroma was generated.

Example 2 A zirconium phosphate complex salt “ZSP” (Daiichi Rare Element Chemical Industry, average particle size 3 μ) was impregnated with an aqueous dispersion of plant turmeric powder, and this was mixed with an alkyd resin. Make the following ink composition, microcapsules 70% (by weight) Silicone oil “KF96” (Shin-Etsu Chemical, silicone rubber with an average particle size of 0.1μ) 20 Flaxseed oil 5 Phenol-modified rosin 5 Fine paper “Kasugai” (Oji Paper, Offset sheet-fed printing was carried out on the weigher 46th edition / 76 Kg), and it was naturally dried by folding with a folding machine before drying. The temporary adhesive strength was around 100 g / inch, and when peeled off, it had a curry-like scent.

Example 3 The zirconium phosphate complex salt used in Example 2 was impregnated with a saturated aqueous solution of ascorbic acid and mixed with an ethylene-vinyl acetate copolymer emulsion to prepare deodorant microcapsules. 60 parts by weight of this microcapsule and emulsion wax "Mobile Sur C" (mobile oil, average particle size of 0.
1 μ) 40 parts by weight were mixed. Coated paper "Top Coat" (Kanzaki Paper Co., Ltd.)
The above temporary adhesive was brushed onto g), and the same paper was overlaid and pressure-bonded. Peel strength is 50-70 g / inch, with lemon-like aroma,
A temporary adhesive having a deodorizing effect was obtained.

Example 4 In Example 3, a silicone emulsion was used in place of the emulsion wax, and was applied to the pattern of the sole of the shoe. By cutting out and peeling off, a pair of deodorant-containing spread leather was obtained.

Example 5 Using the microcapsules of Example 1 and microcapsules encapsulating a liquid crystal whose color changes with a change in temperature, a thermometer was printed (inside-out pattern) on a support. A polyester film was applied to the back surface to increase the flatness and dried, and the film was peeled off to apply an adhesive. This thermometer was able to be stuck on any object with the above-mentioned pressure-sensitive adhesive, and when the support was peeled off, fragrance was generated and it could function as a thermometer. Effects of the Invention The microcapsule-containing temporary adhesive of the present invention is 50 to 500 g /
Provides a temporary bond with the desired peel strength in the inch range. Therefore, even if special care is not taken in transportation of the temporary adhesive body or in bookbinding work, the adhesive can be easily peeled off without causing breakage of the base material. Part of the microcapsules is torn off by peeling and the encapsulated substance appears, which acts as fragrance. The rest of the microcapsules are stored as is,
After that, rub the paper surface strongly to break these,
The action can be reproduced. As described above, by using the temporary adhesive of the present invention, it is easy to produce a newspaper, a book, a magazine, a pamphlet, a catalog or the like that has an aroma when opened. This temporary adhesive can be used in the form of printing ink or paint, and can be efficiently printed or coated with various conventional devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are for explaining an example of use of the temporary adhesive containing microcapsules of the present invention.
FIG. 2 is a perspective view showing a stage of pattern-coating a temporary adhesive on the paper surface, and FIG. 2 is a stage showing a stage of folding and temporarily adhering the paper and then peeling it off. FIGS. 3 and 4 are for explaining the function of the temporary adhesive containing microcapsules of the present invention. FIG. 3 shows a bonded portion, and FIG. 4 shows a peeled portion. It is a typical sectional view showing each. FIG. 5 is a conceptual diagram showing a typical embodiment in which the microcapsule-containing temporary adhesive of the present invention is applied. 1 ... Temporary adhesive containing microcapsules 11 ... Microcapsules, 12 ... Release agent 2,2A, 2B ... Paper

Claims (8)

[Claims] 1. A microcapsule-containing temporary adhesive obtained by mixing microcapsules using a foreskin material having an adhesive function and particles of a release agent having a particle size smaller than the particle size of the microcapsules. 2. The temporary adhesive containing microcapsules according to claim 1, wherein the content of the microcapsules is one or more of perfume, dye, deodorant and liquid crystal. 3. A microcapsule-containing temporary adhesive according to claim 1, which is used by impregnating the contents of the microcapsule with a porous material selected from silica gel, zirconium phosphate complex salt and activated carbon. . 4. The temporary adhesive containing microcapsules according to claim 1 or 2, wherein a material selected from gelatin, glue and cyclodextrin is used as a foreskin material for microcapsules. 5. A microcapsule wrapping material selected from bisphenol A, acrylic resin, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, chloroprene rubber, urethane rubber, polyester, alkyd resin and nitrocellulose. The temporary adhesive containing microcapsules according to claim 3, wherein the temporary adhesive is used. 6. A silicone emulsion as a release agent,
The microcapsule-containing temporary adhesive according to claim 1 or 2, wherein silicone rubber oil, Teflon emulsion, Teflon rubber oil, wax emulsion, and wax selected from wax are used. 7. Microcapsules having a particle size of 0.5 to 80 μ, preferably 30 to 50 μ, and release agent particles having a particle size of 0.0001 to
The microcapsule-containing temporary adhesive according to claim 1 or 2, which has a thickness of 10 μ, preferably 0.0001 to 0.1 μ. 8. The microcapsule-containing temporary adhesive according to claim 1, wherein the microcapsules are mixed in an amount of 10 to 95% by weight and the release agent is mixed in an amount of 90 to 5% by weight.