WO1988006613A1

WO1988006613A1 - Film releasing agent

Info

Publication number: WO1988006613A1
Application number: PCT/JP1988/000232
Authority: WO
Inventors: Hidematsu Shimazaki; Tetsu Tanaka
Original assignee: Nippon Carbide Kogyo Kabushiki Kaisha
Priority date: 1987-03-02
Filing date: 1988-03-02
Publication date: 1988-09-07
Also published as: JPS63213580A; JPH0823000B2

Abstract

A film releasing agent to be used for releasing an adhesive film (or sheet) adhered to an adherent, which is prepared by compounding 100 parts by weight of a resin composed of 5 to 80 wt % of a thermoplastic resin having a solubility parameter of 8 to 11 and 95 to 20 wt % of a solvent having a solubility parameter of 8 to 11 and a boiling point of 40 to 250°C.

Description

Membrane film release agent

Technical field

TECHNICAL FIELD The present invention relates to a film release agent used for peeling an adhesive film (sheet) adhered to an adherend.

The present invention relates to a film release agent capable of easily separating an adhesive film from an adherend without leaving the (adhesive) on the adherend.

Background art

Adhesive films such as marking films are used by being adhered to adherends such as advertising stickers, traffic signs, road signs, information boards, advertising signs, and containers.

Therefore, when the adhesive film is to be re-attached as described above, it is necessary to peel off the adhesive film. Conventionally, this separation is performed with a spatula (scraper) or the like. It is performed by a method such as a method of removing the adhesive film, a method of dissolving the adhesive film with a solvent and wiping it, or a method of swelling and removing the adhesive film with a solvent.

However, the method of removing the adhesive film with a spatula or the like is difficult to separate the film itself, and requires much time and labor. Also, the film cannot be removed neatly, leaving traces of the adhesive. Since the film remains on the adherend, the adhesive must be wiped off with a solvent after the film is peeled off. Furthermore, there is a high possibility that the adherend (substrate) will be damaged.

In addition, the method of dissolving and wiping the adhesive film with a sword does not have a suitable solvent for dissolving the film, adhesive, or the like in a short time, and requires time and labor. Also, it is difficult to wipe off the melted adhesive without soiling the surroundings, and the adherend may be affected by the solvent. In addition, the solvent vapor is easily vaporized and filled, and the odor is severe, and the danger is high.

In addition, a method of removing the adhesive film by swelling it with a solvent is inefficient because the film can be broken finely, and the peeling work is inefficient. Need to be wiped off.

In the latter two methods using solvents, it is necessary to remove the film and the adhesive separately, and it is necessary to use the solvent for the film and the solvent for the adhesive separately. Because peeling work is troublesome.

Therefore, according to the present invention, the workability at the time of film separation can be improved, the film can be easily separated, the adhesive does not remain on the adherend, the adherend is not damaged, and wiping is performed. The present invention provides a novel film release agent which does not require post-treatment and the like, and has various effects such as uniform release of a deteriorated and cracked film. Disclosure of the invention

The present inventors have conducted intensive studies to achieve the above object, and as a result, obtained a composition in which a specific amount of an organic acid is contained in a resin solution obtained by dissolving a specific amount of a specific resin in a specific solvent. When the film is released after being applied or sprayed on the film, the workability at the time of film release can be improved, the film can be easily released, and the adhesive does not remain on the adherend. No post-treatment such as wiping was required, and it was found that even a deteriorated and cracked film could be separated uniformly.

The present invention has been made based on such findings, and has a solubility parameter of 5 to 80% by weight of a thermoplastic resin having a solubility parameter of 8 to 11, a solubility parameter of 8 to 11%, and a boiling point of 8 to 11. Wherein the organic acid is 0.5 to 10 parts by weight with respect to 100 parts by weight of a resin solution comprising 95 to 20% by weight of a solvent having a solvent content of 40 to 250%. The above object has been achieved by providing a film releasing agent which comprises

Hereinafter, the film release agent of the present invention will be described in detail.

The thermoplastic resin, which is one component of the film release agent of the present invention, forms a film when the film release agent of the present invention is applied to or sprayed on a film, thereby reinforcing the film. In addition, a thermoplastic resin having a solubility parameter (SP value) of 8 to 11 retains a solvent, which is another component of the film release agent of the present invention, and suppresses evaporation and outflow. Used. SP If the value is less than 8 or more than 11, the solubility in the solvent to be used is poor, and the adhesion to the film is poor. Preferred thermoplastic resins are those containing 60% or more of chloride chloride and having a number-average degree of polymerization () of 200 to 200, more preferably the thermoplastic resin has a chloride / butyl chloride content of at least 200%. Vinyl acetate = 60 to 100 Z 40 to Q homo- or copolymers of 200 to 200 000. If it is less than 200, the coating after drying is too brittle to reinforce the film, whereas if it is more than 2000, the solubility in the solvent is poor, and the film release agent The viscosity is high and the fluidity is poor, making it difficult to apply.

Further, the solvent, which is another component of the film release agent of the present invention, can be used when the film release agent of the present invention is applied or sprayed on the film to swell and soften the film. In addition, it reduces the adhesive strength of the adhesive (adhesive) to make the film easier to separate from the adherend. It is a solvent with an SP value of 8 to 11 and a boiling point of 40 to 250 mm. Then, a solvent for dissolving the thermoplastic resin is used. When the SP value is less than 8 or more than 11, it is difficult to dissolve the thermoplastic resin, and the film cannot be swelled or softened. On the other hand, if the boiling point is lower than 40 ° C., the evaporation rate is so high that a sufficient amount of solvent does not reach the adhesive layer, resulting in 250. If it exceeds C, the volatilization rate is too slow, and it takes too much time to form a film having sufficient strength to separate the film.

Examples of the solvent include ethylene glycol monomethyl acetate. Tenorene, ethylene glycol monoethylenolene, ethylenic alcohol butanol, benzene, toluene, xylene, ethylenic alcohol monoethyl ether, acetic acid Ethylene glycol monobutyl ether, n-butyl lactate, diethyl alcohol monoethyl ether acetate, acetone, methino olethino lesketone, methinoleisobutino lesketone, cyclohexinosan, a Those composed of one or more selected from sophorone, methyl acetate, ethyl acetate, n-propyl acetate and ethyl alcohol monomethyl acetate are preferably used.

The organic acid, which is another component of the film release agent of the present invention, weakens the tack of the adhesive when the film release agent of the present invention is applied or sprayed on the film. Preferably, an organic acid soluble in the above-mentioned solvent, particularly preferably p-toluenesulfonic acid, is used.

Thus, the film release agent of the present invention is obtained by adding the organic resin to 100 parts by weight of a resin solution comprising 5 to 80% by weight of the thermoplastic resin and 95 to 20% by weight of the solvent. It is made up of 0.5 to 10 parts by weight of acid.

When the content of the thermoplastic resin is less than 5% by weight or the content of the solvent is more than 95% by weight, the film is formed after the film releasing agent of the present invention is applied to a film or sprayed and dried. The applied film is too thin to reinforce the film, It is not possible to retain the above-mentioned barrier that is sufficient to penetrate the adhesive layer. On the other hand, if the content of the thermoplastic resin is more than 80% by weight or the content of the above-mentioned solvent is more than 20% by weight, it is difficult to dissolve in the above-mentioned solvent, and the viscosity becomes too high and the fluidity is lost. It is difficult to apply a film release agent. If the amount of the organic acid is less than 0.5 part by weight, the compounding of the organic acid does not occur, and the tack of the adhesive is weakened when a film release agent is applied or sprayed on the film. Cannot reduce the adhesive strength. Conversely, if the amount of the organic acid is more than 10 parts by weight, the solubility of the film is poor and the stability of the film release agent is deteriorated. unacceptable.

Further, in the film release agent of the present invention, 5 parts by weight of the surfactant is added to 100 parts by weight of the thermoplastic resin in order to improve the release property of the film and reduce the force required for release. Or less can be owned. Preferred surfactants to be used include, for example, sodium alkylbenzenesulfonate, fatty acid salt, alkylsulfate, alkylamine acetate, and polyoxyethylene alkylene. One-tel type and sorbitan ester type are exemplified.

Further, in the film releasing agent of the present invention, in order to uniformly disperse the surfactant in the film releasing agent, the solvent having a polar group is added to 100 parts by weight of the thermoplastic resin. Not more than parts by weight can be contained. Preferred electrode to be included Examples of the solvent having a functional group include isopropyl alcohol, ethanol, methanol, ethylene glycol, and glyceryl ethylene glycol.

The film releasing agent of the present invention can be produced, for example, by heating a thermoplastic resin and a solvent while stirring to prepare a resin solution, and then adding an organic acid to the resin solution. Can be done.

When the film release agent of the present invention is used, the film release agent of the present invention may be applied or sprayed on a film adhered to an adherend via an adhesive. The applied or sprayed film is separated from the corners when the film surface is dried and no longer sticky after being left for a while after application or spraying, for example. Can be lifted lightly by hand.

The amount of the film release agent used for releasing the film as described above is preferably about 50 to 250 g Z film area (m ² ). Such an amount is much smaller than the amount used in the conventional method of peeling the adhesive film by using a solvent, and therefore does not cause a problem as in the conventional method. Further, when the film is released by applying or spraying the film releasing agent of the present invention in this manner, the workability when the film is released can be improved, and the film can be easily peeled. Adhesive does not remain on the adherend, does not damage the adherend, does not require post-treatment such as wiping, and Even films that have deteriorated and cracked can be peeled uniformly.

In addition, the film release agent of the present invention can be used to apply an adhesive film such as a masking film having an adhesive layer to a relatively large advertising force, a traffic sign, a road sign, a road sign, a guide board, an advertising sign, It is preferably used when separating from an adherend such as a container, but it is needless to say that the present invention is not limited to such a case.

The film is separated by hand as described above. For example, after applying or spraying the film releasing agent of the present invention on the adhesive film, water or hot water is sprayed on the film at high pressure. Can also be performed. It is preferable to spray water or hot water at a normal discharge pressure (internal pressure of nozzle during spraying operation) at 30 Kg Zot or more. Spraying hot water can release the film in a shorter time. it can. If the normal discharge pressure of hot ice is less than 30 Kg / c, it is difficult to separate the film because the discharge pressure of hot water from the nozzle is low. For this spraying, it is preferable to use a nozzle with high straightness of the sprayed water or hot water. It is preferable that the spraying is performed toward the peripheral portion (end portion) of the film. Usually, the spraying is performed toward the peripheral portion of the adhesive film, particularly toward the adhesive layer (adhesive layer). It is preferable to carry out at an angle of 0 to 70 degrees, preferably 20 to 45 degrees and a distance of about 1 to 100 cm. The discharge amount of water or hot water is not particularly limited, but is usually 1 to 100 min, preferably 5 to 30 min. £ minutes, more preferably 10 to 20 minutes.

〔Example〕

Next, examples and comparative examples will be described.

Examples 1 to 3 and Comparative Examples 1 to 4

A film release agent was manufactured according to the following film release agent manufacturing method with the composition shown in Table 1 below, and according to the evaluation of the following film release agent, the manufactured film release agent (Example 1) 3 and Comparative Examples 1 to 2 and 4) were evaluated. The results are shown in Table 2 below. Note that the film release agent of Comparative Example 3 was not evaluated because it was cloudy separated.

Table 1

(note)

-Units of mixing ratio: parts by weight '' Viscosity: at 20 mm, the unit is centivoise

• Thermoplastic resin: Copolymer of vinyl chloride / vinyl acetate = 70/30 (SP value 10.5) with T = about 400 'Solvent: methylethyl ketone (SP value 9. 3) / Toluene (SP value: 8.9) Xylene (SP value: 8.8) = 550 Mixed solvent consisting of zo40 '• Organic acid: p-toluenesulfonic acid

• Surfactant: sodium alkylbenzene sulfonic acid • Solvent having polar group: isopropyl alcohol

A thermoplastic resin and a solvent were placed in a flask with a condenser, and a resin solution was prepared while stirring and heating to 50 to 55, and an organic acid was added thereto. A release agent was produced, and the release agents of Cold Examples 2, 3 and Comparative Examples 1 to 4 were made according to such a production method.

剝 Release agent evaluation ffi

(1) Content of tested sample

The following three types of marking films (all manufactured by Nippon Carbide Co., Ltd.) which were affixed to aluminum plates and exposed outdoors for 0, 6, 12, 18, 24 and 30 months, respectively, were used.

♦ H / C 5010 M: White marking film • H / C 5080 A: Transparent marking film

• H / C 5040 M: Black marking film

(2) Peeling test method

A release agent is applied with a paint brush on the sample exposed outdoors and left at room temperature (approximately 20 to 25) for 10 to 15 minutes to remove any sticky surface. At that point, the sample was slowly and manually separated from the corner by hand.

(3) Result judgment method

A: Both film and adhesive are completely separated

B: The adhesive remains after the film is peeled off, but it was easily scraped off

C: The adhesive remained after the film was peeled off and could not be scraped off

D: The film is broken and cannot be separated cleanly.

Industrial.

The film release agent of the present invention can improve the workability when the film is peeled after being applied or sprayed on the film, the film can be easily released, and the adhesive can be used. It does not remain on the adherend, does not damage the adherend, does not require post-treatment such as wiping, and has various effects such as being able to uniformly separate even a deteriorated and cracked film. .

Claims

1. 580% by weight of a thermoplastic resin having a solubility parameter of 811 and a solvent 952 0 having a solubility parameter of 811 and a boiling point of 420.50. 0.5% by weight of organic acid to 100 parts by weight of a resin solution consisting of

A film release agent characterized by having five parts owned.

of

2. Five parts of surfactant per 100 parts by weight of thermoplastic resin

E

Less than 40 parts by weight of a solvent having a polar group

0

The film release agent described in claim 1 <

3. The film release agent according to claim 1, wherein the organic acid is an organic acid soluble in a solvent.

4. The film releasing agent according to claim 1, wherein the organic acid is p-toluenesulfonic acid.

5. The film release agent according to claim 1, wherein the thermoplastic resin contains 60% or more of vinyl chloride and has a number-average degree of polymerization (2) of 200.000. .

6. The thermoplastic resin is vinyl chloride / vinyl acetate = 60

The film releasing agent according to claim 1, wherein the film releasing agent is a homopolymer or a copolymer having a number average polymerization degree () of 200/400.

0 7. When the solvent is ethylene glycol monomethyl ether, ethylene glycol monomethyl ether or ethylene glycol Cornole monobutyl ether, benzene, tonolene, xylene, ethylenic anhydride alcohol monoethyl ether, ethylene glycol acetate monobutyl ether, n-butyl butyrate, diethylene glycol acetate Monoethyl ether, acetate, methyl ethyl ketone, methyl isobutyl ketone, cyclohexinosan, isophorone, methyl acetate, ethyl acetate, n-propyl acetate, n-propyl acetate, ethyl acetate One or two or more selected from the

Four

The film stripping agent according to claim 1 of the claim.