JPH0726069B2 - Solvent for peeling adhesive tape - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a solvent for peeling an adhesive tape, which is applied onto an adhesive tape stuck to a wall surface or the like to peel off the adhesive tape. It relates to the solvent used in.

(Prior Art) It is widely practiced to attach an adhesive tape, a sticker, a label, or the like to a wall, a shelf, or another article for display. It is difficult to peel off the adhesive tape, sticker, label and the like (hereinafter, collectively referred to as an adhesive tape) attached in this manner after the attachment once, as it is. Especially,
It is difficult to even remove an adhesive tape that has been left for a while after being attached.

It is often necessary to remove the adhesive tape after attaching it. For example, when the display is stained or the display needs to be changed, it is necessary to remove the adhesive tape. In such a case, if you forcibly remove the adhesive tape,
The surface layer of the article to which the adhesive tape has been attached until now (hereinafter referred to as the adherend) is stripped off together with the adhesive tape, or only the adhesive remains on the surface of the adherend, The adherend was contaminated. Therefore,
Attempts have been made to facilitate peeling of the adhesive tape using a solvent for peeling the adhesive tape.

The solvent for peeling an adhesive tape is not so simple that it only needs to dissolve the adhesive in the adhesive tape. because,
This is because the solvent for peeling the adhesive tape should not dissolve the support sheet in the adhesive tape and should not damage the surface of the adherend. For example, when a strong solvent such as toluene is used alone as a solvent for peeling an adhesive tape, the toluene dissolves the adhesive, but with it, even the paint applied to the surface of the adherend often dissolves. Leading to. Therefore, a strong solvent such as toluene cannot be used as a solvent for peeling an adhesive tape. As described above, the solvent for peeling the adhesive tape should not be one having an extremely strong dissolving power, nor one having an extremely weak dissolving power, and one which has an appropriate dissolving power. I have to.

In addition to the dissolving power, the solvent for peeling an adhesive tape is required to have various properties. For example, the solvent must not be toxic because the peeling must be done in the presence of a person. Also, the solvent must not be highly flammable. Further, the solvent should not damage the support sheet in the adhesive tape. This is because, for example, if the solvent also damages the support sheet in the adhesive tape, it becomes extremely difficult to peel the support sheet from the adherend. On top of that, the solvent is
Unless it acts so that it easily penetrates between the adhesive tape and the adherend, weakens the adhesive force of the adhesive with the adhesive, and the adhesive can be separated from the adherend together with the supporting sheet. I won't. As described above, since the adhesive tape peeling solvent is required to have various properties, it has not been easy to provide the adhesive tape peeling solvent. Therefore, the conventional one is not satisfactory either.

Examining the patent gazette, Japanese Patent Laid-Open No. 52-95585 provides a solvent for peeling an adhesive tape. In the invention of the solvent for peeling an adhesive tape, the publication explains that it is not easy to provide the solvent as follows. That is, if the support sheet in the adhesive tape has good permeability like paper, the adhesive tape can be peeled off with an ordinary solvent, but the support sheet has poor permeability such as rubber or plastic. If there is, it is said that it cannot be peeled off with an ordinary solvent. In addition, this publication recommends that a ketone-based solvent having a boiling point of 100 ° C. or higher, a carbitol-based solvent, and a lubricating oil be blended in a specific ratio to form an adhesive tape peeling solvent. However, this solvent is not satisfactory. The reason is that this solvent may be effective in first removing the support sheet and removing the adhesive remaining after that, as shown in the examples, but due to its poor penetration into the adhesive layer, This is because the adhesive cannot be peeled off together with the support sheet by applying it from above.

Further, JP-A-60-124676 also provides a solvent for peeling an adhesive tape. The publication discloses that six kinds of aromatic hydrocarbons, ketones, halogenated hydrocarbons, ethylene glycol esters, acetic acid esters, and alcohols are appropriately selected as a solvent for peeling an adhesive tape. Suggests what to do. Since the peeling solvent covers a wide range that can be said to include almost all organic solvents, depending on the selection, the support sheet of the pressure-sensitive adhesive tape and the surface of the adherend may be selected. It may also damage and, in some cases, may have no stripping effect. Further, in this proposal, it is not easy to peel off the pressure-sensitive adhesive together with the support sheet from the adherend because the solvent has a weak penetrating power to the pressure-sensitive adhesive. Thus, the solvent provided by this publication was also unsatisfactory.

When only the adhesive in the adhesive tape remains on the adherend, a cleaning agent can be used to remove it. However, what is called a cleaning agent cannot be used as it is as a solvent for peeling an adhesive tape. Because, as mentioned above, the solvent for peeling the adhesive tape does not damage the supporting sheet in the adhesive tape, penetrates between the adhesive and the adherend, and easily peels the adhesive together with the supporting sheet. This is because the cleaning agent does not take into account the relationship to the support sheet, where it must be.

(Problems to be Solved by the Invention) In view of the above situation, the present inventor has attempted to newly provide a solvent for peeling an adhesive tape. Specifically, the present invention is a solvent that has no risk of ignition and is less toxic, has a suitable dissolving power for the adhesive of the adhesive tape, and has a suitable boiling point. When applied from above the tape support sheet, the solvent penetrates into the pressure-sensitive adhesive layer without damaging the support sheet, especially between the pressure-sensitive adhesive layer and the adherend, and the pressure-sensitive adhesive adheres to the support sheet. It is intended to provide a solvent that allows the support sheet to be peeled off from the adherend in the left state.

(Means for Solving the Problem) This inventor has 1, 1, 2, 2-tetrachloro-1, 2
-Difluoroethane (hereinafter referred to as Freon 112)
Is a solvent with a high dissolving power and has a moderate boiling point of 92.8 ° C, while normal propyl alcohol (hereinafter referred to as propanol) is a solvent with a low dissolving power and has a moderate boiling point of 98.7 ° C. Moreover, it was noted that the both can be mixed at an arbitrary ratio to form a homogeneous phase mixture. Further, the present inventor, when mixing Freon 112 and propanol, not only does not damage the supporting sheet in the adhesive tape, but also makes it difficult to dissolve general paints, and is sufficient to dissolve only the adhesive. I found that. Furthermore, this inventor
In a mixed solvent of 112 and propanol, an alkylene oxide adduct containing a specific perfluoroalkyl group,
When the alkyl phosphate ester containing a perfluoroalkyl group is added, the mixture thus obtained has a greater force of penetrating the adhesive in the adhesive tape adhered, and thus the adhesive in the adhered state is adhered. It has been found that it is suitable as a solvent for peeling a tape. The present invention has been completed based on such knowledge.

The present invention, (a) and Freon 112, (b) propanol and, (c) general formula _{CnF 2 n + 1 -R 1 -O-} (R 2 -O) mH or An ethylene oxide adduct containing a perfluoroalkyl group represented by (hereinafter referred to as FOR),
(D) general formula _{(CnF 2 n + 1 -R 1} -O) q P (OH) 3 -q or A gist of the solvent for peeling a pressure-sensitive adhesive tape is characterized by being mixed with an alkyl phosphate ester containing a perfluoroalkyl group represented by (hereinafter, referred to as FPO).

In the above formula, n represents an integer of 6-12, m represents a positive integer, q represents 0.5 to 2.5, R ₁ is an alkylene group having ₁ to 3 carbon atoms, R ₂ is an ethylene group, R ₃ represents hydrogen or an alkyl group having 1 to 5 carbon atoms.

The solvent for peeling an adhesive tape according to the present invention is composed of the four components (a) to (d) as described above. Of these, CFC 112 is a solvent having a large dissolving power as described above, and propanol is a solvent having a not so large dissolving power.By mixing the two, only the adhesive in the adhesive tape is appropriately dissolved. On the other hand, even if the support sheet in the pressure-sensitive adhesive tape is made of a plastic material, it can have a dissolving power so as not to dissolve the support sheet. Moreover, Freon
112 and propanol can be mixed in arbitrary ratios and always form a homogeneous phase, so that adjustment of the dissolving power thereof is easier. Further, this mixed solvent has a low toxicity, a low risk of ignition, and an appropriate evaporation rate in air at room temperature.

Further, in the present invention, the FOR described in (c) and the FPO described in (d) are used at the same time. FOR and FP
O is all known as a surfactant containing fluorine. Of these, the former FOR is created as follows, for example. First, the general formula CnF ₂ n _{+ 1} -R 1 -O
- (R ₂ -O) a compound represented by mH, the alcohol containing a perfluoroalkyl group, an ethylene oxide to CnF ₂ n + ₁ -R ₁ -OH It was obtained by blowing in and adding this. This compound is already commercially available. For example from Atchem
Compounds sold under the name FORAFAC1110 are those having a _{C 8 F 17 C 2 H 4} O (C 2 H 4 O) mH structural formula. Instead of CnF ₂ n _{+ 1} -R 1 -OH used above, When a perfluoroalkylsulfonylamino alcohol represented by Is obtained. This compound is already commercially available. For example, the compound sold by Dai Nippon Ink Co., Ltd. under the name of Megafask F142D is Is represented by.

The FPO of (d) is made as follows. For example, the general formula _{(CnF 2 n + 1 -R 1} -O) q P (OH) compounds represented by 3 -q is phosphorylase a containing perfluoroalkyl group alcohol CnF ₂ n _{+ 1} -R 1 -OH Honi chloride It can be made by reacting with POCl ₃ . This compound is also commercially available. For example, the compound sold under the name Zonyl UR by Deyupon It is a compound having the structural formula of. Instead of CnF ₂ n _{+ 1} -R 1 -OH used above, With, Can be obtained. This compound is also commercially available. For example, the compound sold by Dainippon Ink Co., Ltd. under the name of Megafask F191 is It is a compound with the structure of.

The solvent of the present invention is mainly composed of Freon 112 and propanol, and only a small amount of FOR and FPO is added. Freon 112 accounts for 80-90 parts by weight, propanol accounts for 10-20 parts by weight, and FOR is 0.1-0.
2% by weight, and 0.01% to 0.05% by weight of FPO.

The solvent according to the present invention is preferably placed in a suitable container, a sponge such as urethane sponge is attached to the mouth of the container, and an appropriate amount of the solvent can be applied through the sponge. By doing this, it is possible to easily move a desired amount of solvent to the adhesive tape and to a desired position on the adhesive tape only by allowing the sponge portion to rub and move over the support sheet of the adhesive tape. Can be given to.

(Effect of the Invention) The solvent according to the present invention can be easily peeled off from the surface of an adhesive tape adhered to the surface of an adherend by simply applying the solvent onto the adhesive tape. That is, since this solvent contains Freon 112 and propanol, it mainly acts on the pressure-sensitive adhesive without damaging the support sheet of the pressure-sensitive adhesive tape, dissolves the pressure-sensitive adhesive, and reduces its adhesive strength. In particular, since this solvent contains FOR and FPO, it easily penetrates between the pressure-sensitive adhesive and the adherend based on their surface-active effects, and therefore easily reduces the adhesive force between them. Becomes Therefore, when this solvent is applied around the adhesive tape and then the adhesive tape is peeled off from the adherend, the adhesive tape can be easily peeled off from the adherend while the adhesive is still adhered to the support sheet. Further, since both CFC 112 and propanol are volatile solvents having a boiling point of near 90 ° C., the solvent according to the present invention is
It exhibits a moderate volatility at room temperature, which means that the adhesive in the adhesive tape has been dissolved over a suitable time period, thus facilitating the peeling of the adhesive tape. Further, since the solvent according to the present invention has less risk of ignition and less toxicity, it is suitable for use as a stripping agent. The solvent according to the present invention has the advantages described above.

The reason why the solvent according to the present invention is excellent will be specifically described below with reference to Examples and Comparative Examples. Below,
The term “parts” means “parts by weight”.

Example 1 The following composition was prepared as a solvent for peeling an adhesive tape.

Freon 112 85 parts Propanol 15 parts Compound represented by the following structural formula as FOR A compound represented by the following structural formula as FPO On the other hand, adhesive tape made of kraft paper (Gumtape manufactured by Sekisui Chemical Co., Ltd.) was attached to a stainless steel plate polished with water-resistant abrasive paper No. 300 over a width of 5 cm and a length of 10 cm, and then 2 kg of rubber was applied on it. The roller was placed and pressed with a rubber roller to adhere the adhesive tape well onto the stainless steel plate.

From above the adhesive tape, 3 ml of the above-mentioned solvent was applied to the entire periphery of the adhesive tape and left for 1 minute, and then the adhesive tape was peeled off in the direction of 180 ° at a peeling speed of 300 mm / min. In this way, the adhesive tape could be easily peeled off. The adhesive strength when peeled off was 804 g / 50 mm. No adhesive remained on the stainless steel plate after peeling.

Further, similar experiments were conducted using a melamine decorative board, a polymethylmethacrylate board, a phenol resin coated board, and a white wood instead of the stainless steel board. In that case, 10 cc of the above solvent was applied or left for 15 minutes after application, but the adhesive tape could be easily peeled off without damaging the plate.

For comparison, an attempt was made to peel off the above-mentioned pressure-sensitive adhesive tape without using the solvent of the present invention, but in that case, the adhesive strength at the time of peeling was 2089 g / 50 mm.

Comparative Example 1 The following composition was prepared as a solvent for peeling an adhesive tape.

1,1,2-Trichloro-1,2,2-trifluoroethane 45 parts Isopropyl alcohol 45 parts Polyethylene glycol (average molecular weight 200) 10 parts Surfactant containing a perfluoroalkyl group In exactly the same manner as in Example 1, an adhesive tape was attached on a stainless steel plate, the above solvent was applied thereto, and then the adhesive tape was peeled off. The adhesive strength when peeled off is 1414 g /
It was 50 mm and it was difficult to peel it off. Also, after peeling off, a large amount of adhesive was attached on the stainless steel plate. The adhered adhesive could be removed by rubbing it with the above solvent.

Comparative Example 2 The following composition was prepared as a solvent for peeling an adhesive tape.

Freon 112 85 parts Propanol 15 parts Compound represented by the following structural formula as FOR In exactly the same manner as in Example 1, an adhesive tape was attached on a stainless steel plate, the above solvent was applied thereto, and then the adhesive tape was peeled off. Adhesion when peeled off is 1046g /
It was 50mm and it was not easy to peel it off. Also,
After peeling off, a large amount of adhesive remained on the stainless steel plate. The residual adhesive could be wiped off with the above solvent.

Comparative Example 3 The following composition was prepared as a solvent for peeling an adhesive tape.

Freon 112 85 parts Propanol 15 parts A compound represented by the following structural formula as FPO In exactly the same manner as in Example 1, an adhesive tape was attached on a stainless steel plate, the above solvent was applied thereto, and then the adhesive tape was peeled off. Adhesion when peeled off is 1109 g /
It was 50 mm and it was not easy to peel it off. Also, a large amount of adhesive remained on the stainless steel plate after peeling off, but this adhesive could be wiped off with the above solvent.

Comparative Example 4 The following composition was prepared as a solvent for peeling an adhesive tape.

Freon 112 85 parts Propanol 18 parts Alkyl phosphates not containing perfluoroalkyl groups C ₁₆ H ₃₃ OP (OH) ₂ 0.02 parts Alkylene oxide adducts not containing perfluoroalkyl groups C ₁₆ H ₃₃ O (C ₂ H ₄ O ) ₁₀ H 0.2 part Adhesive tape was stuck on a stainless steel plate, the above solvent was applied thereon, and the adhesive tape was peeled off in exactly the same manner as in Example 1. Adhesive strength when peeled off is 1300 g /
It was 50 mm and it was difficult to peel it off. Also, after peeling off, a large amount of adhesive remained on the stainless steel plate. The residual adhesive could be removed by further applying the above solvent and wiping it off.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyasu Haraguchi 2-4-4 Nishitenma Kita-ku, Osaka City, Osaka Prefecture Sekisui Chemical Co., Ltd. (56) Reference JP-A-2-151682 (JP, A) JP 52-95585 (JP, A) JP 60-124676 (JP, A) JP 1-111181 (JP, A) JP 63-471 (JP, B2) JP 53-23271 (JP, B2) Japanese Patent Publication No. Sho 58-41891 (JP, B2) “Collection of Well-Known and Conventional Techniques (Adhesion)” edited by the Japan Patent Office (S59. 6.15) p. 170

Claims (2)

[Claims] 1. (a) 1,1,2,2-tetrachloro-
And 1,2-difluoroethane, (b) and n-propyl alcohol, (c) general formula _{CnF 2 n + 1 -R 1 -O-} (R 2 -O) mH or Ethylene oxide adduct containing a perfluoroalkyl group represented in, (d) general formula _{(CnF 2 n + 1 -R 1} -O) q P (OH) 3 -q or A solvent for peeling an adhesive tape, characterized by being mixed with an alkyl phosphate ester containing a perfluoroalkyl group represented by: However, n is an integer of 6-12, m is a positive integer, q is 0.5 to 2.5, R ₁ is an alkylene group having a carbon number of 1-3, R ₂ is an ethylene group, R ₃ is hydrogen or a carbon number of 1-. 5 represents an alkyl group. 2. In the first claim, 1, 1,
80% of 2,2-tetrachloro-1,2-difluoroethane
-90 parts by weight, 10-20 parts by weight of normal propyl alcohol, 0.1-0.2 parts by weight of an alkylene oxide adduct, and 0.01-0.05 parts by weight of an alkyl phosphate ester. Adhesive tape peeling. Solvent.