JPH039971A - Aerosol adhesive - Google Patents

Abstract

PURPOSE:To provide an aerosol adhesive which is not toxic, safe for the human body, chemically stable and free from a lowering in bonding strength with the lapse of time and does not cause clogging by adding polybutene to an adhesive component as a binder. CONSTITUTION:An adhesive component is prepared by using polybutene as a binder and blending it with a rosin (e.g. synthetic rosin) and an organic solvent (e.g. n-hexane) when necessary. Then, an aerosol adhesive is produced by putting this adhesive component into an aerosol container, pressing a propellant (e.g. liquefied petroleum gas) into it and sealing it tightly. It is adequate to use polybutene in an amount of 5 to 100wt.% in the adhesive component, and the weight ratio of the adhesive component to the propellant is preferably 95/5 to 5/95. The obtained aerosol adhesive is used suitably for sticking a level to a corrugated fiberboard case, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is non-toxic and safe for the human body, is chemically stable and does not lose adhesive strength over time, and is suitable for use with aerosol mechanism valves and This invention relates to a pressure-sensitive aerosol adhesive that does not cause clogging due to adhesive components inside buttons.

[Prior art] Pressure-sensitive adhesives have traditionally been widely used on adhesive surfaces of so-called cellophane adhesive tapes, but in recent years, demand for pressure-sensitive adhesives that can be used directly on surfaces to which they are adhered has increased. There is. This type of pressure-sensitive adhesive is mainly used for pasting paper sheets together, such as pasting labels on cardboard cases, pasting posters, pasting photographs, pasting newspaper clippings, pasting stamps, etc. Since it is easy to use, it is being used as an aerosol adhesive, for example. Examples of pressure-sensitive adhesives used as aerosol adhesives include synthetic resins such as vinyl acetate resin and acrylic resin, and synthetic rubbers such as chloroprene rubber and styrene rubber as binders. It is known that a propellant is added to a solution in which this is dissolved or dispersed in a solvent.

However, if a solvent with a high dissolving power, such as an aromatic hydrocarbon solvent or a chlorinated solvent, is used as a binder solvent for an aerosol adhesive, such a solvent is highly toxic and may pose a risk to the human body. This poses a major safety issue, and the use of solvents with low dissolving power may pose a major safety issue.Although such solvents have low toxicity and pose little safety issue, they do not meet the physical requirements of the resulting aerosol adhesive. In order to impart stability, much labor is required at the product design stage and production process stage, which has the disadvantage of increasing costs.

Furthermore, due to the physical and chemical properties of the binder used in conventional aerosol adhesives, they often clog inside the valves and buttons of the aerosol mechanism, resulting in a loss of commercial value as an aerosol adhesive. It had the disadvantage of being small.

[Problems to be Solved by the Invention] Therefore, as a result of intensive research in view of the above-mentioned conventional technology, the present inventors have developed an adhesive that is low in toxicity and safe for the human body, is chemically stable, and has adhesive strength that lasts over time. Furthermore, even if the adhesive component dries, it will not completely solidify, and the valves and buttons of the aerosol mechanism will not become clogged, and since the adhesive component is liquid at room temperature, it is physically stable. For the first time, they discovered a completely new aerosol adhesive that solved all of the problems of the prior art, such as being easy to prepare, and completed the present invention.

[Means for Solving the Problems] That is, the present invention relates to an aerosol adhesive characterized in that the adhesive component contains polybutene as a binder.

[Function and Examples] The aerosol adhesive of the present invention contains polybutene as a binder.

The polybutene used in the present invention is a chemically stable compound with low toxicity, and is easily soluble in low toxicity saturated aliphatic hydrocarbon and saturated alicyclic hydrocarbon solvents, and remains completely dry even when dried. It has an excellent property of not solidifying.

A typical example of the polybutene is a random copolymer of isobutylene and normal butylene.

The kinematic viscosity (37.8°C) of the polybutene is 600C8
t or more, preferably 2000 cSt or more. If the kinematic viscosity is less than 800 cSt, the adhesive effect tends to decrease.

Note that there is no particular limitation on the upper limit of the kinematic viscosity of the polybutene, and even a general-purpose polybutene having a high viscosity can be used.

The content of the polybutene in the adhesive component is 5 to 100
% (weight %, hereinafter the same), preferably 10 to 70%, particularly preferably 30 to 60%. If the content is less than 5%, the resulting adhesive tends to be less effective in imparting adhesive strength. Here, the polybutene content of 100% means that only polybutene is used as an adhesive component in the present invention, and when only polybutene is used as an adhesive component in this way, sufficient adhesive strength is obtained. In order to express this, it is preferable that the kinematic viscosity of the polybutene is adjusted to be 600 cSt or more, particularly 200 C3t or more.

In order to impart stronger adhesive force to the adhesive component of the aerosol adhesive of the present invention, it is preferable to incorporate rosin into the adhesive component.

The rosin, like polybutene, is a chemically stable compound with low toxicity, and is easily soluble in organic solvents such as saturated aliphatic hydrocarbons and saturated alicyclic hydrocarbons, which tend to have low toxicity.

Examples of such rosin include natural rosin and synthetic rosin. Although any rosin can be used in the present invention, it is preferable to use synthetic rosin because it has excellent chemical stability. Synthetic rosin is an alicyclic saturated hydrocarbon resin synthesized from petroleum naphtha, and since it contains almost no double bonds in its molecules and no groups containing elements other than carbon and hydrogen, it has poor light resistance and other properties. It has excellent chemical stability. The natural rosin is a rosin ester obtained by esterifying abietic acid, which is the main component of natural rosin, and typical examples thereof include ester gum. The content of the rosin in the adhesive component is preferably 80% or less, preferably 60% or less, and particularly preferably 50% or less. If the content exceeds 80%, the adhesive strength decreases, and valves and the like tend to become clogged.

Note that the content of the rosin cannot be determined unconditionally because it varies depending on the use of the adhesive obtained.
In order to provide sufficient adhesive strength, it is usually preferable that the amount is 30% or more.

The adhesive component of the aerosol adhesive of the present invention has a viscosity of 50 to 10,000 cP at 25°C, preferably 100 to 10,000 cP.
Desirably, it is 5000 cP. The viscosity is 50c
If it is less than 10,000 cP, it tends to sag on the coated surface, resulting in poor usability, and if it exceeds 10,000 cP, it tends to cause clogging in valves, etc.

In addition, if the viscosity of the adhesive component is within the above range,
Although it can be used as it is, if the viscosity is higher than the upper limit, it is preferable to dilute it with an organic solvent and adjust it to the desired viscosity.

Examples of the organic solvent include saturated aliphatic hydrocarbon solvents such as n-pentane, n-hexane, and n-heptane because they have low toxicity and have good solubility for polybutene and rosin. They can be used alone or in combination of two or more.

Note that, if necessary, these organic solvents may be used in combination with an alcohol solvent such as ethyl alcohol or isopropyl alcohol.

The content of the organic solvent in the adhesive component cannot be determined unconditionally because it varies depending on the viscosity of the adhesive component as described above, so it is desirable to adjust it appropriately depending on the use of the commonly available aerosol adhesive.

Since the adhesive component consisting of the polybutene, rosin and organic solvent blended as necessary is chemically stable, the resulting aerosol adhesive exhibits very little decrease in adhesive strength over time.

Examples of propellants used in the aerosol adhesive of the present invention include liquefied petroleum gases such as isobutane, normal butane, and propane; liquefied petroleum gases such as dimethyl ether; Freon gases such as methane, monochlorodifluoroethane, and trichlorotrifluoroethane; examples include compressed gases such as N2 gas and CO2 gas; these propellants may be used alone or in combination of two or more.

The weight ratio of the propellant to the adhesive component (hereinafter referred to as adhesive component/propellant) is 5/95 to 9515, preferably 30/70 to 90/10, particularly preferably 50/10.
It is desirable to adjust the ratio to 50 to 85/15. If the adhesive component/propellant exceeds 9515, the adhesive tends to be difficult to spray;
If it is less than /95, the amount of adhesive component blended in the aerosol adhesive will be relatively small, and the adhesive force of the resulting aerosol adhesive will tend to be too low.

Among the propellants, liquefied petroleum gas, liquefied dimethyl ether gas, and chlorofluorocarbon gas act as solvents for polybutene and rosin like the above-mentioned solvents, so they can be used in place of the organic solvents. When such a propellant is used, there is no need to intentionally incorporate a solvent, and the viscosity of the adhesive component can be easily adjusted to an appropriate value, which is preferable. It goes without saying that these propellants may be used in combination with the organic solvent to adjust the viscosity of the adhesive component to a desired value.

In the present invention, in addition to the above-described polybutene, rosin, and organic solvent, depending on the purpose and use, thickeners such as silicic anhydride and liquid paraffin; fillers such as calcium carbonate, kaolin, baryta, and talc may be used. The following additives may be appropriately blended into the adhesive component.

There are no particular limitations on the type of aerosol container used in the present invention, and specific examples thereof include commonly used aerosol containers, piston cans, bag-in cans, and the like.

The aerosol adhesive of the present invention is prepared by putting the adhesive component containing the above-mentioned polybutene, rosin and organic solvent blended as necessary into an aerosol container, press-fitting a propellant into the container and sealing it, and then inserting the nozzle into the aerosol container. If the viscosity of the adhesive is adjusted to be particularly high, such as pressure-sensitive adhesives, which are made by attaching paper and are mainly used for gluing paper surfaces together, for example, adhesive cockroach traps, etc. It can also be used as an adhesive for adhesive mousetraps, etc. Also, depending on the purpose of use, for example, if you want to create a foam-type aerosol adhesive, you can reduce the proportion of the propellant, and if you want to create a mist-type adhesive, you can reduce the proportion of the adhesive component Adjustments can be made to change the formulation composition by increasing the proportion of propellant without increasing the viscosity of the aerosol, or by selecting the type of nozzle attached to the aerosol container to change the discharge form that is most suitable for the purpose of use. Bye. The type of the nozzle is
For example, when applying to a large area such as pasting up a poster, you can select a mist spray nozzle, and when applying to a small area such as pasting a stamp, a paste or foam nozzle can be selected. A discharge type nozzle may be selected.

The thus obtained aerosol adhesive of the present invention has low toxicity, is safe for the human body, exhibits very little decrease in adhesive strength over time, and furthermore, the adhesive component does not completely solidify even when dried. , there will be no clogging in the valves or buttons of the aerosol mechanism. moreover,
Since such adhesive components are liquid at room temperature, the resulting aerosol adhesive is physically stable and can be suitably used for various purposes, primarily as a pressure-sensitive adhesive.

Next, the aerosol adhesive of the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples.

In each example, "part" means "part by weight".

Example 1 Polybutene (manufactured by Idemitsu Petrochemical ■, trade name: Idemitsu Polybutene 100H1 kinematic viscosity: 1L200cSt (37.8°C)
), synthetic rosin (manufactured by Arayo Kagaku Kogyo ■, trade name: Alcon M-1oo) and normal hexane were mixed and dissolved to have the composition shown below, and a liquid adhesive component (viscosity: 150 cP (25°C )) was obtained.

Next, the obtained adhesive component is poured into an aerosol container (full amount:
Then, the amount of liquefied petroleum gas shown below was injected using a pressure crab (6 ksg/Q-.G), and the mixture was sealed, and a foam discharge type nozzle was attached to obtain a foam discharge type aerosol adhesive.

(Composition) Polybutene 23.5 parts Synthetic rosin 46 parts Normal hexane 30.5 parts Liquefied petroleum gas 17.5 parts The obtained aerosol adhesive was applied to paper, and photographs and stamps were pasted on it. It was found that the adhesive was stable and did not lose adhesive strength over time, and was suitable for application to small areas. Next, when we pressed another piece of paper with our fingers onto the adhesive-applied paper, the paper bonded together in a short time, confirming that the adhesive surface had stable adhesive strength. Ta.

From the above, it can be seen that the aerosol adhesive obtained above can be suitably used as a pressure-sensitive adhesive.

Next, when the paper surfaces were left attached for a long time, no decrease in adhesive strength was observed. Furthermore, even when the aerosol adhesive was continuously jetted from the aerosol container, no clogging occurred in the valves or buttons of the aerosol mechanism.

Example 2 Polybutene (manufactured by Idemitsu Petrochemical ■, product name: Polybutene 3
00 II, kinematic viscosity: 37,000 cSt (37,8
(°C)), the same synthetic rosin and normal hexane used in Example 1 were mixed to have the composition shown below to obtain a liquid adhesive component (viscosity: 800 cP (25°C)). Next, the obtained adhesive component was put into an aerosol container (dropping volume: 2230 ml), and then the amount of nitrogen gas shown below was injected (pressure: 6 kg/Cd-G), and then a paste discharge type nozzle was used. I attached it and got a pasty discharge type aerosol adhesive.

(Composition) Polybutene 33 parts Synthetic rosin 40 parts Normal hexane 27 parts Nitrogen gas 0.5 parts The obtained aerosol adhesive was tested in the same manner as in Example 1. It was confirmed that it had excellent properties comparable to those obtained in 1.

Example 3 The same polybutene, synthetic rosin, and n-hexane used in Example 1 were mixed in the amounts shown below to obtain a liquid adhesive component (viscosity: tsocp (25°C)).

Next, put the obtained adhesive component into an aerosol container, then press in the amount of liquefied dimethyl ether gas shown below (pressure crab 4.91 [/CJ-G), and then attach a mist injection nozzle to the following. We obtained a spray-type, quick-drying aerosol adhesive consisting of the following composition.

(Composition) Polybutene 20 parts Synthetic rosin
50 parts normal hexane
30 parts liquefied dimethyl ether gas 65 parts When the obtained aerosol adhesive was used to attach a poster,
Since it was easy to apply and had a suitable adhesive strength, it was confirmed that it is suitable for application to objects having a wide area.

Example 4 The same polybutene used in Example 1, synthetic rosin, ester gum (manufactured by Arayo Kagaku Kogyo ■, trade name Nis-Perester A-75), n-hexane and isopropyl alcohol were mixed to form the following formulation. A liquid adhesive component (viscosity: 130 cP (25°C)) of the composition was obtained.

The obtained adhesive component was poured into an aerosol container (dropping amount: 295 m
1), then the following amount of liquefied petroleum gas was injected (pressure crab 4 cg/cf) and sealed, and a mist injection nozzle was attached to obtain a mist injection type aerosol adhesive.

(Composition) Polybutene 15.5 parts Synthetic rosin
8 parts ester gum 38.5 parts normal hexane 20 parts isopropyl alcohol
18 parts liquefied petroleum gas 54 parts When the obtained aerosol adhesive was used to attach the poster, an even stronger adhesive force was obtained compared to when the aerosol adhesive obtained in Example 3 was used.

Example 5 Polybutene (manufactured by NOF ■, product name: Polybis NC-7
000, kinematic viscosity: 1500-2000 cSt (98,
9° C.)) and 15 parts of liquefied petroleum gas were placed in an aerosol container (dropping fl: L60 ml), and a paste discharge type nozzle was attached to obtain a paste discharge type aerosol adhesive.

The obtained aerosol adhesive was applied to cardboard and used for cockroach-trapping sheets and rat-trapping sheets, and it was found to be suitable for both purposes.

Example 6 10 parts of polybutene (manufactured by NOF ■, trade name: Polyvis 5N, kinematic viscosity: 4400 cSt (37.8°C)) and 90 parts of liquefied petroleum gas were placed in an aerosol container (dropping amount: 230
m1), and a mist spray nozzle was attached to obtain a mist spray type aerosol adhesive.

When the obtained aerosol adhesive was applied to one side of the wallpaper and then the powder pigment was attached, the powder pigment adhered uniformly and firmly. From this, it can be seen that the obtained aerosol adhesive can be suitably used for the purpose of attaching a powder pigment after applying the adhesive.

Example 7 Polybutene (manufactured by NOF ■, product name: Bolivis 015N
, kinematic viscosity: 880 cSt (37.8°C)) 21 parts, synthetic rosin (manufactured by Arayo Kagaku Kogyo ■, trade name: Alcon M-1
00) Liquid aerosol adhesive (viscosity: 120 cP (25°C)) was prepared by mixing 70 parts and 9 parts of normal hexane.
) was obtained. 100 parts of the obtained aerosol adhesive and 8 parts of liquefied petroleum gas as a propellant were added to an aerosol container (dropping amount:
200 ml), and then a paste discharge type nozzle was attached to obtain a paste discharge type aerosol adhesive.

When the obtained aerosol adhesive was applied to the mortar surface, it was able to be applied uniformly to the uneven surface, indicating that the obtained aerosol adhesive can be suitably used on surfaces with large unevenness. Recognize.

Examples 8 to 12 Adhesive components were obtained by adjusting various components shown in Table 1. Table 1 shows the viscosity of the adhesive component obtained.

Next, the obtained adhesive component and the propellant shown in Table 1 were filled into an aerosol container (dropping amount: 295 ml),
Then, a mist spray nozzle was attached to obtain a mist spray aerosol adhesive. The physical properties of the resulting aerosol adhesive were evaluated for adhesive strength, valve clogging, and ease of application based on the following evaluation criteria. The results are also listed in Table 1.

(Adhesive strength) The obtained aerosol adhesive was applied to cardboard paper, memo paper was pasted on the coated surface, and evaluation was made based on the following evaluation criteria.

(Evaluation criteria) O: High adhesive strength and suitable for use.

Δ: Adhesive strength is small and may be unsuitable for practical use.

×: Adhesive force is too small to be practical.

(Clogging of valve) The obtained aerosol adhesive was dispensed 30 times per month and evaluated based on the following evaluation criteria.

(Evaluation criteria) ○: No clogging occurs and can be used suitably.

Δ: Some clogging is observed, but it is usable for practical use.

×: Clogging occurs and cannot be put to practical use.

(Ease of application) The obtained aerosol adhesive was applied to a vertically held corrugated paperboard and evaluated based on the following evaluation criteria.

(Evaluation criteria) ○: Can be applied uniformly and easily to the adhered surface.

Δ: Slight sagging occurs on the adhered surface, but it can be used in practical use.

×: The coating is not uniformly applied to the adhered surface or the coating operation is difficult.

[Margin below] From the above results, it can be seen that the aerosol adhesives obtained in Examples 8 to 12 all have excellent adhesive strength, do not clog valves, and are easy to apply.

[Effects of the Invention] The aerosol adhesive of the present invention is non-toxic and safe for the human body, and since the adhesive component is chemically stable, it maintains excellent adhesive strength over time. It has the effect of being maintained for a long period of time without significant changes.

In addition, the aerosol adhesive of the present invention does not completely solidify even when the adhesive component dries, so it does not cause clogging in the valves or buttons of the aerosol mechanism, and can be used repeatedly over a long period of time. be effective.

Further, the aerosol adhesive of the present invention is physically stable because the adhesive component is liquid at room temperature, and is easy to prepare.

Claims (1)

[Scope of Claims] 1. An aerosol adhesive characterized in that the adhesive component contains polybutene as a binder. 2. The aerosol adhesive according to claim 1, wherein the adhesive component contains rosin. 3. The aerosol adhesive according to claim 2, wherein the rosin is a synthetic rosin. 4 Weight ratio of adhesive component and propellant (adhesive component: propellant)
The aerosol adhesive according to claim 1, wherein the aerosol adhesive is blended in a ratio of 5:95 to 95:5.