JPH10152655A - Adhesive sheets for coating protection and coating protection method - Google Patents

Abstract

(57) [Summary] [Problem] To provide an adhesive sheet for coating protection that can protect the coating of an article such as a business card and does not cause damage or contamination of the article when releasing the coating protection. . SOLUTION: This is an adhesive sheet 1 for covering and protecting the article 3 with an adhesive seal 4 at the peripheral edge thereof in close contact with the surfaces 3a and 3b of the article 3. A polyester containing a polycarbonate structure and having a weight average molecular weight of 30,000 or more as a main component. This polyester is crosslinked to make the solvent insoluble content 1 to 50% by weight. It is characterized in that a layer 11 made of a non-sticky or slightly sticky adhesive composition is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet used for covering and protecting articles such as business cards, name tags, photographs and documents.
The present invention relates to an adhesive sheet for covering and protecting in the form of a tape or a tape, and a method for protecting and covering the above-mentioned articles using the same.

[0002]

2. Description of the Related Art Conventionally, as a method for covering and protecting articles such as business cards, name tags, photographs, documents, etc., a method in which a plastic is pressed against a surface of the article by using a heat press, an adhesive sheet, and the like. Is known.

[0003]

However, the heat press method requires a special device for that purpose,
In addition, there is a fear of burns, etc., so that it cannot be easily performed by anyone.
On the other hand, the method using adhesive sheets can be easily performed by anyone.However, after pasting once, when trying to take out an article such as a business card, the article is broken by the adhesive force of the adhesive sheet. There is a problem that the glue is left on the surface of the article and contaminates the article.

[0004] In view of the above circumstances, the present invention aims to protect articles such as business cards by using an adhesive sheet that can be easily used by anyone. The purpose of the present invention is to prevent breakage or contamination of a safe article.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, they have shown substantially no tackiness on the substrate as an adhesive sheet. By using a layer of a specific pressure-sensitive adhesive composition that exhibits self-adhesiveness, it is possible to sufficiently protect the cover of articles such as business cards, and to break or contaminate the article when releasing this cover protection. Knowing that such problems can be avoided, the present invention has been completed.

That is, the present invention relates to pressure-sensitive adhesive sheets which are closely adhered to the surface of an article to cover and protect the article by means of an adhesive seal at a peripheral portion thereof. (R is a linear or branched hydrocarbon group having 2 to 20 carbon atoms) having a weight average molecular weight of 30,000 or more containing a polycarbonate structure as a main component. Crosslinking to make solvent insoluble content 1-50%
A self-adhesive force of not less than 1 kg / 20 mm width and a layer comprising a non-adhesive or slightly-adhesive adhesive composition at room temperature; It relates to sheets (claim 1).

Further, the present invention provides a method for protecting a coating using the adhesive sheet for coating protection having the above-mentioned structure, wherein the adhesive surface of the adhesive sheet for coating protection having the above-mentioned structure is brought into close contact with the surface of an article.
A method of protecting a coating, characterized in that articles are coated and protected only with the above-mentioned adhesive sheets by bonding the above-mentioned adhesive surfaces together at a peripheral portion to form an adhesive seal portion. Item 2) and a non-adhesive sheet in which the adhesive surface of the adhesive sheet for covering protection having the above-mentioned structure is brought into close contact with the surface of the article, and the adhesive force of the adhesive surface is 1 kg / 20 mm width or more at the periphery. Forming an adhesive seal portion by adhering the adhesive sheet to the article so as to cover and protect the article between the adhesive sheet and the non-adhesive sheet. And a method (claim 3).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive sheet for covering protection of the present invention is brought into close contact with the surface of various articles such as business cards, name tags, photographs, documents, etc. It is used to protect the coating, and comprises a substrate and a layer made of a specific pressure-sensitive adhesive composition provided on the substrate. As the base material, polyester film,
From plastic films such as polycarbonate films, metal foils, porous materials, etc., from those having a large anchoring force with a layer made of an adhesive composition provided thereon,
Thickness usually about 10 to 100 μm is used.

The layer comprising the pressure-sensitive adhesive composition provided on the substrate has the following formula: (R is a straight-chain or branched hydrocarbon group having 2 to 20 carbon atoms) containing a polyester having a polycarbonate structure as a main component. The weight average molecular weight is 30,000 or more, preferably 50,000 or more (usually up to 300,000). If the weight average molecular weight is less than 30,000, the cohesive strength is insufficient, which is not preferable.

Although such a polyester can be synthesized by various methods, it is usually preferable to synthesize it by a condensation reaction using a diol and / or dicarboxylic acid having a polycarbonate structure. Particularly, diols having a polycarbonate structure are preferably used because they are commercially available. In this case, the esterification reaction between the diol component, which requires a diol having a polycarbonate structure as an essential component, and a dicarboxylic acid component can be carried out according to a conventional method using no catalyst or an appropriate catalyst. In this case, the diol component and the dicarboxylic acid component are desirably in equimolar reaction, but any one of them may be used in excess to promote the esterification reaction.

[0011] Examples of the diol having a polycarbonate structure include hexamethylene carbonate diol, 3-methylpentenecarbonate diol, propylene carbonate diol, and the like. There is a mixture or a copolymer thereof. These diols have a number average molecular weight of usually 500 or more, preferably 800 or more (usually 10,000 or more).
00). If the molecular weight is low, the synthesized polyester becomes too hard as a pressure-sensitive adhesive, and the self-adhesiveness decreases. Examples of commercially available products include “PLACCEL CD208PL”, “CD210PL”, “CD220PL”, and “CD2PL” manufactured by Daicel Chemical Industries, Ltd.
08 "," CD210 "," CD220 "," CD "
D208HL "," CD210HL "," CD22 "
0HL ".

The diol component may be ethylene glycol, propylene glycol, butanediol, if necessary.
Components such as linear diols such as diol, hexanediol, octanediol, decanediol, octadecandiol, and various branched diols may be appropriately mixed and used. Also, to increase the molecular weight of the polymer,
A small amount of a tri- or higher functional polyol component may be added.

The dicarboxylic acid component has an aliphatic or alicyclic hydrocarbon group having 2 to 20 carbon atoms as a molecular skeleton, and the above-mentioned hydrocarbon group may be linear or branched. May be. Specifically, succinic acid, methylsuccinic acid, adipic acid, pimelicic acid, azelaic acid, sebacic acid,
Examples thereof include 1,12-dodecandioic acid, 1,14-tetradecandioic acid, tetrahydrophthalic acid, endomethylenetetrahydrophthalic acid, and acid anhydrides and lower alkyl esters thereof.

In the present invention, such a polyester is appropriately crosslinked so that the solvent-insoluble content is 1 to 50% by weight, preferably 2 to 30% by weight, and substantially no tack is exhibited. An adhesive composition exhibiting strong self-adhesiveness. Here, when the solvent insoluble content exceeds 50% by weight,
If sufficient self-adhesiveness cannot be obtained, or a non-adhesive
Insufficient adhesive strength for If the content is less than 1% by weight, there is a problem that the feeling of tackiness is increased, the article is broken when the covering protection of the article is released, and the article is contaminated by adhesive residue.

The crosslinking method is optional. For example, a method using a so-called crosslinking agent, in which a compound having a functional group capable of reacting with a hydroxyl group and / or a carboxyl group contained in the polyester is added and reacted. Examples of such a crosslinking agent include a polyisocyanate compound, an epoxy compound, and an aziridine compound. Among them, a polyisocyanate compound is particularly preferably used.

The polyisocyanate compound includes:
Ethylene diisocyanate, butylene diisocyanate
Alicyclic polyisocyanates such as lower aliphatic polyisocyanates such as hexamethylene diisocyanate, cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate ,
Aromatic polyisocyanates such as 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate. In addition, tolylene diisocyanate adduct of trimethylolpropane,
Hexamethylene diisocyanate adduct of trimethylolpropane is also used.

These crosslinking agents can be used alone or in a mixture of two or more. The amount used is appropriately selected depending on the balance with the polyester to be crosslinked.
In general, the ratio of the crosslinking agent is preferably about 0.3 to 5 parts by weight with respect to 100 parts by weight of the polyester. By using such a ratio, the solvent-insoluble content falls within the above range. An adhesive composition can be obtained.

As another crosslinking method, a method of adding a polyfunctional monomer as a substantial crosslinking agent and crosslinking with an electron beam or the like may be adopted. The polyfunctional monomers include polyethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, tetramethylol methanetetra (meth) acrylate, trimethylol
And propane tri (meth) acrylate.

The amount of the polyfunctional monomer used is appropriately selected depending on the balance with the polyester to be crosslinked and the purpose of use as the pressure-sensitive adhesive composition. In general, the ratio of the polyfunctional monomer is preferably about 1 to 7 parts by weight with respect to 100 parts by weight of the polyester. By using such a ratio, the solvent-insoluble content falls within the above range. An adhesive composition can be obtained.

The pressure-sensitive adhesive composition of the present invention is obtained by cross-linking the above-mentioned polyester as described above, and is non-adhesive or slightly adhesive at room temperature and shows substantially no tack, but has a self-adhesive force of 1 kg / kg.
It shows a width of 20 mm or more, preferably 2.5 to 10 kg / 20 mm. In this pressure-sensitive adhesive composition, if necessary,
Various conventionally known tackifiers may be added. Also,
Various conventionally known additives such as inorganic or organic fillers, powders such as metal powders and pigments, particles, and foils can be arbitrarily included.

The pressure-sensitive adhesive sheet for coating protection of the present invention is obtained by providing the pressure-sensitive adhesive composition thus constituted on the above-mentioned substrate so as to have a thickness of usually about 20 to 70 μm. is there. According to a conventional method, it may be applied directly on the base material or may be once applied on a release paper and then transferred onto the base material according to a conventional method. The cross-linking treatment is usually performed after such coating or transfer.

Next, a method for coating and protecting an article such as a business card by using the adhesive sheet for coating protection of the present invention will be described with reference to the drawings. FIG. 1 shows an example in which an article is coated and protected only with the adhesive sheet for coating protection of the present invention, and FIG. 2 shows an article using the adhesive sheet for coating protection and a non-adhesive sheet of the present invention. This is an example of coating protection.

In FIG. 1, two sheets of the adhesive sheet for covering protection of the present invention are used. The two protective sheets 1 of the present invention having a configuration in which a layer 11 made of the specific adhesive composition is provided on a base material 10 on the front surface 3a and the back surface 3b of an article 3 such as a business card. 1 adhesive surface, that is, the above layers 11, 11
The sides are brought into close contact with each other, and the adhesive surfaces are bonded together at the peripheral edge to form an adhesive seal portion 4. As a result, the article 3 is covered and protected by the adhesive sheets 1 and 1 having the above configuration.

In this example, the self-adhesiveness of the coating-protecting adhesive sheet is used as it is. Since the self-adhesive force is large, strong coating protection is achieved. On the other hand, in order to release the coating protection, the adhesive surfaces adhered to the adhesive seal portion 4 may be peeled off from each other, and at this time, the surface of the article 3 is non-adhesive or slightly adhesive at room temperature. Since the layer 11 composed of the composition is merely in close contact with the layer, it does not mean that the layer 11 is strongly adhered. Therefore, there are no particular problems such as tearing of the article and generation of adhesive residue on the article surface.

In the above example, instead of using two sheets of covering and protecting adhesive sheets, one sheet of covering and protecting adhesive sheets is used and this is folded in half. Various modifications can be made such that the article is brought into close contact with both the front and back surfaces, and the adhesive faces are adhered to each other at the periphery to cover and protect the article in a bag shape.

In FIG. 2, an adhesive sheet for coating protection of the present invention and a non-adhesive sheet having an adhesive force of 1 kg / 20 mm width or more are used. On the surface 3a of the article 3 such as a business card, the adhesive surface of the coating protective adhesive sheet 1 of the present invention having the base material 10 and the layer 11 composed of the specific adhesive composition, that is, the above-mentioned layer 11 side The adhesive surface is adhered to the non-adhesive sheet 2 closely attached to the back surface 3b side of the article 3 at the peripheral edge to form an adhesive seal portion 5. As a result, the article 3 is covered and protected between the adhesive sheet 1 and the non-adhesive sheet 2 having the above configuration.

This example utilizes the adhesive force of the adhesive sheet for coating protection of the present invention to non-adhesive sheets, and the above-mentioned non-adhesive sheets include an adhesive sheet. The same adhesive strength as that of the base material constituting the kind, for example, polyester film or polycarbonate film, the above-mentioned adhesive strength is 1 kg / 20 mm width or more, especially 2.5-10 kg / 2.
Those having a width of 0 mm are preferably used. Also in this example, strong covering protection is achieved, and the release can be achieved by peeling off the adhesive surface of the adhesive seal portion 5, and in this case,
The surface of the article 3 is only in close contact with the layer 11 made of the pressure-sensitive adhesive composition that is non-adhesive or slightly adhesive at room temperature, and is not strongly adhered. There is no particular problem such as generation of glue residue.

[0028]

Next, an embodiment of the present invention will be described in more detail. In the following Examples and Comparative Examples, the solvent-insoluble content, self-adhesive strength, and adhesive strength to non-adhesive sheets of the pressure-sensitive adhesive composition were measured by the following methods. In the following, “parts” means “parts by weight”.

<Measurement of Solvent-Insoluble Content> Adhesive sheet for coating protection
Layer composed of pressure-sensitive adhesive composition (after crosslinking treatment)
Was sampled in about 0.1 g, precisely weighed, immersed in about 50 ml of toluene at room temperature for 5 days, then the solvent-insoluble matter was taken out, dried at 130 ° C. for about 1 hour, and weighed. The solvent insoluble content [X] (% by weight) was calculated by the following equation.

<Measurement of self-adhesive force> A test piece having a width of 20 mm and a length of 150 mm was prepared from a pressure-sensitive adhesive sheet for coating protection, and the pressure-sensitive adhesive surfaces were bonded together at the center with a 2 kg roller. After 20 minutes of application at 23 ° C., the peeling force was measured at a peeling speed of 300 mm / min.

<Measurement of adhesive strength to non-adhesive sheets>
20mm wide and 150mm long from the adhesive sheet for coating protection
Was prepared, and the pressure-sensitive adhesive surface was set at an ambient temperature of 23 ° C.
Then, on a non-adhesive sheet, it was bonded with a 2 kg roller, and after 20 minutes of bonding, the peeling force was measured at a peeling speed of 300 mm / min.

Example 1 A four-neck separable flask was equipped with a stirrer, a thermometer and a water separating tube, and was made into a liquid polycarbonate [PLACCEL CD210P manufactured by Daicel Chemical Industries, Ltd.]
L ", hydroxyl value: 115.9 KOHmg / g] 200 g
(Hydroxyl group: 0.41 equivalent), succinic anhydride 20.51 g
(Acid group: 0.41 equivalent), dibutyltin oxide (hereinafter referred to as DBTO) 102 mg (0.1 equivalent%) as a catalyst were charged, and stirring was started in the presence of a small amount of toluene as a reaction water discharge solvent. While raising the temperature to 180 ° C,
It was kept at this temperature. After a while, effluent separation of water was observed, and the reaction began to proceed. The reaction was continued for about 30 hours to obtain a polyester having a weight average molecular weight of 65,000.

This polyester was diluted with toluene to a solid concentration of 40% by weight. To 100 parts (solid content) of the polyester, 2 parts (solid content) of diphenylmethane diisocyanate (“Millionate MT” manufactured by Nippon Polyurethane Co., Ltd.) was added as a cross-linking agent. Solution. This adhesive composition solution is applied by an applicator.
Applied on a 38 μm thick polyethylene terephthalate film (hereinafter referred to as PET film)
For 5 minutes to form a layer of a pressure-sensitive adhesive composition having a thickness of 50 μm. Furthermore, 5
Aging was performed for 2 days in an atmosphere of 0 ° C. to prepare an adhesive tape for coating protection.

This pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 10% by weight in a layer composed of the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 5.5 kg / 20 mm.
It was width. From the adhesive tape for coating protection, 100
Cut out two tape pieces of 150 mm in length and 150 mm in length, and as shown in FIG. 1, these tape pieces are brought into close contact with the front and back surfaces of a paper business card, and the adhesive surfaces are adhered to each other at the peripheral edge. By forming a seal portion, a composite was prepared in which the business card was covered and protected with the tape pieces in a San-Germanic manner.

Since the self-adhesive force between the adhesive surfaces was large, this composite had an excellent effect of protecting business cards. After leaving the composite in an oven at 80 ° C. for 7 days, the adhesive tape with the adhesive surfaces stuck together was peeled off, and the business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 2 As a non-adhesive sheet, the adhesive tape for coating protection prepared in Example 1 had an adhesive force of 5.0 kg / 2.
A polycarbonate film having a width of 0 mm and a thickness of 50 μm was used. From these adhesive tapes and non-adhesive sheets, cut out 100 mm wide and 150 mm long tape pieces, respectively, and as shown in FIG. 2, these tape pieces were put on the front and back of a paper business card. The above business card is made to adhere to both the adhesive tape and the non-adhesive sheet by making the adhesive tape portion adhere to the non-adhesive sheet at the peripheral edge while being adhered to both sides. A complex was formed by coating and protecting in a San-Germanic manner.

Since this composite had a large adhesive force of the adhesive tape to the non-adhesive sheets, it was excellent in the effect of protecting the business card from being covered. This complex is placed in an oven at 80 ° C. for 7 minutes.
After standing for a day, peel off the adhesive tape
The business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

In the production of the above-mentioned composite, the adhesive force of the coating protective adhesive tape prepared in Example 1 was 0.1 kg / 20 mm width and the thickness was non-adhesive sheets. 50
When a polyethylene film having a thickness of μm was used, the above-mentioned adhesive strength was too small, so that the effect of protecting the cover of the business card was inferior, and satisfactory results were not obtained.

Example 3 A four-necked separable flask was equipped with a stirrer, a thermometer, and a water separation tube, and was made into a liquid polycarbonate ["PLACCEL CD210P" manufactured by Daicel Chemical Industries, Ltd.]
L ", hydroxyl value: 115 KOH mg / g], 250 g (hydroxyl group: 0.512 equivalent), adipic acid: 37.44 g (acid group: 0.512 equivalent), DBTO as a catalyst 127
mg (0.1 equivalent%), the mixture was heated to 180 ° C. while stirring was started in the presence of a small amount of toluene as a solvent for discharging reaction water, and kept at this temperature. After a while, effluent separation of water was observed, and the reaction began to proceed. The reaction was continued for about 35 hours to obtain a polyester having a weight average molecular weight of 80,000.

This polyester was diluted with toluene to a solid concentration of 40% by weight. For 100 parts (solid content) of this polyester, 1 part (solid content) of diphenylmethane diisocyanate as a cross-linking agent and hexamethylene diisocyanate adduct of trimethylolpropane [manufactured by Nippon Polyurethane Co., Ltd. Of “Coronate HL”] was added to obtain a pressure-sensitive adhesive composition solution. Next, the pressure-sensitive adhesive composition solution was applied to a thickness of 38 by an applicator.
It was applied on a PET film of μm and dried at 130 ° C. for 5 minutes to form a layer made of a pressure-sensitive adhesive composition having a thickness of 50 μm. Further, aging was carried out for 2 days in an atmosphere of 50 ° C. as an after cure to prepare an adhesive tape for coating protection.

The pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 12% by weight in the layer composed of the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 5.2 kg / 20 mm.
It was width. Using this adhesive tape for coating protection, a paper business card was coated and protected in a San-Germanic manner in the same manner as in Example 1.
A composite as shown in FIG. 1 was produced. This composite had a large self-adhesive force between the adhesive surfaces, and thus had an excellent effect of protecting the business card from being covered. This complex is placed in an oven at 80 ° C. for 7 minutes.
After leaving it to stand for a day, the adhesive surface
The cover was peeled off, and the business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 4 As a non-adhesive sheet, the adhesive tape for coating protection prepared in Example 3 had an adhesive force of 3.1 kg / 2.
Using a polyester film having a width of 0 mm and a thickness of 50 μm, a business card made of paper was covered and protected in the same manner as in Example 2 to form a composite as shown in FIG.
Since this composite had a large adhesive strength of the adhesive tape to non-adhesive sheets, it was excellent in the effect of protecting the cover of the business card. The composite was allowed to stand in an oven at 80 ° C. for 7 days, and then the adhered adhesive tape was peeled off to release the business card from being protected. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

In the production of the above composite, as a non-adhesive sheet, the adhesive force of the coating protective adhesive tape prepared in Example 3 was 0.2 kg / 20 mm width, and the thickness was 20 kg. 50
When using a polypropylene film of μm, because the adhesive force is too small, the effect of protecting the cover of the business card is inferior,
Satisfactory results have not been obtained.

Example 5 A four-necked separable flask was equipped with a stirrer, a thermometer and a water separation tube, and was made into a liquid polycarbonate [PLACCEL CD220P manufactured by Daicel Chemical Industries, Ltd.].
L ", hydroxyl value: 56.1 KOHmg / g] 250 g (hydroxyl group: 0.25 equivalent), sebacic acid 25.28 g (acid group: 0.25 equivalent), DBTO as a catalyst 62 mg
(0.1 equivalent%) In the presence of a small amount of xylene as a solvent for discharging reaction water, the temperature was raised to 180 ° C. while stirring was started, and maintained at this temperature. After a while, effluent separation of water was observed, and the reaction began to proceed. The reaction was continued for about 30 hours to obtain a polyester having a weight average molecular weight of 90,000.

This polyester was diluted with toluene to a solid concentration of 40% by weight. Based on 100 parts (solid content) of this polyester, 0.8 part (solid content) of diphenylmethane diisocyanate as a crosslinking agent, and hexamethylene diisocyanate adduct of trimethylolpropane [Nippon Polyurethane Co., Ltd. (Coronate HL), 0.2 part (solid content) was added to obtain an adhesive composition solution. The pressure-sensitive adhesive composition solution was applied to an 38 μm-thick P
Apply on ET film, dry at 130 ° C for 5 minutes,
A layer made of the pressure-sensitive adhesive composition having a thickness of 50 μm was formed.
Further, aging was carried out for 2 days in an atmosphere of 50 ° C. as an after cure to prepare an adhesive tape for coating protection.

The pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 8% by weight of a layer composed of the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 4.8 kg / 20 mm width. It was. Example 1 was prepared using this adhesive tape for protecting the coating.
In the same manner as described above, the paper business card was covered and protected in a San-Germanic manner to produce a composite as shown in FIG. This composite had a large self-adhesive force between the adhesive surfaces, and thus had an excellent effect of protecting the business card from being covered. After leaving the composite in an oven at 80 ° C. for 7 days, the adhesive tape with the adhesive surfaces stuck together was peeled off, and the business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 6 As the non-adhesive sheet, the adhesive tape for coating protection prepared in Example 5 had an adhesive force of 4.6 kg / 2.
Using a polycarbonate film having a width of 0 mm and a thickness of 50 μm, a paper business card was covered and protected in a San-Germanic manner in the same manner as in Example 2 to produce a composite as shown in FIG. Since this composite had a large adhesive strength of the adhesive tape to non-adhesive sheets, it was excellent in the effect of protecting the cover of the business card. The composite was allowed to stand in an oven at 80 ° C. for 7 days, and then the adhered adhesive tape was peeled off to release the business card from being protected. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 7 To 100 parts (solid content) of the polyester obtained in Example 5, 3 parts of 1,6 hexanediol diacrylate was added as a substantial crosslinking agent to prepare an adhesive composition solution. . The pressure-sensitive adhesive composition solution is applied with an applicator to a thickness of 3
The composition was applied on an 8 μm PET film and dried at 100 ° C. for 5 minutes to form a layer of a 50 μm thick adhesive composition. Further, an electron beam was irradiated for 3 Mard to prepare an adhesive tape for coating protection.

The pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 5% by weight of the layer comprising the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 4.2 kg / 20 mm width. It was. Example 1 was prepared using this adhesive tape for protecting the coating.
In the same manner as described above, the paper business card was covered and protected in a San-Germanic manner to produce a composite as shown in FIG. This composite had a large self-adhesive force between the adhesive surfaces, and thus had an excellent effect of protecting the business card from being covered. After leaving the composite in an oven at 80 ° C. for 7 days, the adhesive tape with the adhesive surfaces stuck together was peeled off, and the business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 8 As a non-adhesive sheet, the adhesive tape for coating protection prepared in Example 7 had an adhesive force of 2.2 kg / 2.
Using a polyester film having a width of 0 mm and a thickness of 50 μm, a business card made of paper was covered and protected in the same manner as in Example 2 to form a composite as shown in FIG.
Since the adhesive strength of the adhesive tape to the non-adhesive sheets was relatively large, the composite almost satisfied the effect of protecting the cover of the business card. The composite was allowed to stand in an oven at 80 ° C. for 7 days, and then the adhered adhesive tape was peeled off to release the business card from being protected. As a result, the peeling is easy,
There was no problem such as the business card being torn, and there was no problem that glue remained on the business card surface and contaminated the business card.

Example 9 To 100 parts (solid content) of the polyester obtained in Example 5, a hexamethylene diisocyanate adduct of trimethylolpropane was used as a substantial crosslinking agent ["Corone" manufactured by Nippon Polyurethane Co., Ltd. -HL ") (2 parts (solid content)) to obtain an adhesive composition solution. This pressure-sensitive adhesive composition solution was applied on a PET film having a thickness of 38 μm by an applicator, and dried at 130 ° C. for 5 minutes.
A layer of a 0 μm pressure-sensitive adhesive composition was formed. further,
As an after-care for 2 days in a 50 ° C atmosphere
Zing was performed to prepare an adhesive tape for coating protection.

This pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 40% by weight of a layer composed of the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 1.5 kg / 20 mm.
It was width. Using this adhesive tape for coating protection, a paper business card was coated and protected in a San-Germanic manner in the same manner as in Example 1.
A composite as shown in FIG. 1 was produced. Since the self-adhesive force between the adhesive surfaces of this composite was relatively large, the effect of protecting the business card from being covered was almost satisfied. After leaving the composite in an oven at 80 ° C. for 7 days, the adhesive tape with the adhesive surfaces stuck together was peeled off, and the business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Example 10 As a non-adhesive sheet, the adhesive tape for coating protection prepared in Example 9 had an adhesive force of 2.0 kg / 2.
Using a polycarbonate film having a width of 0 mm and a thickness of 50 μm, a paper business card was covered and protected in a San-Germanic manner in the same manner as in Example 2 to produce a composite as shown in FIG. Since the adhesive strength of the adhesive tape to the non-adhesive sheets was relatively large, the composite almost satisfied the effect of protecting the cover of the business card. This complex is placed in an oven at 80 ° C. for 7 minutes.
After standing for a day, peel off the adhesive tape
The business card cover protection was released. As a result, there is no problem that the above-mentioned peeling is easy and the business card is broken, and there is no problem that the business card is contaminated by adhesive residue remaining on the business card surface.

Comparative Example 1 Hexamethylene diisocyanate adduct of trimethylolpropane as a substantial crosslinking agent was added to 100 parts (solid content) of the polyester obtained in Example 5 [Corone manufactured by Nippon Polyurethane Co., Ltd.] -HL "] was added to obtain an adhesive composition solution. This pressure-sensitive adhesive composition solution was applied on a PET film having a thickness of 38 μm by an applicator, and dried at 130 ° C. for 5 minutes.
A layer of a 0 μm pressure-sensitive adhesive composition was formed. further,
As an after-care for 2 days in a 50 ° C atmosphere
Zing was performed to prepare an adhesive tape for coating protection.

The pressure-sensitive adhesive tape for coating protection has a solvent-insoluble content of 60% by weight in a layer composed of the pressure-sensitive adhesive composition, is non-adhesive or low-adhesive at room temperature, and has a self-adhesive force of 0.7 kg / 20 mm.
It was width. Using this adhesive tape for coating protection, a paper business card was coated and protected in a San-Germanic manner in the same manner as in Example 1.
An attempt was made to produce a composite as shown in FIG. However, since the self-adhesive force between the adhesive surfaces is too small, the effect of protecting the business card from covering is remarkably inferior, and a sufficiently satisfactory composite has not been obtained.

Comparative Example 2 The adhesive tape for coating protection prepared in Comparative Example 1 and the above-mentioned adhesive tape as a non-adhesive sheet had an adhesive force of 0.8 kg / 2.
Using a polycarbonate film having a width of 0 mm and a thickness of 50 μm, a paper business card was covered and protected in a San-Germanic manner in the same manner as in Example 2, and an attempt was made to produce a composite as shown in FIG. . However, since the adhesive force of the adhesive tape to the non-adhesive sheets is too small, the effect of protecting the cover of the business card is remarkably poor, and a sufficiently satisfactory composite has not been obtained.

Comparative Example 3 The polyester solution obtained in Example 5 was applied on a PET film having a thickness of 38 μm by using an applicator.
After drying at 0 ° C. for 5 minutes, a layer composed of the pressure-sensitive adhesive composition having a thickness of 50 μm was formed. Further, aging was carried out in an atmosphere of 50 ° C. for 2 days to prepare an adhesive tape for coating protection.

This adhesive tape for coating protection has a solvent insoluble content of 0% by weight in the layer composed of the adhesive composition, has tackiness at room temperature, and has a self-adhesive force of 1.9 kg / 20 mm width. Atsuta.
Using this adhesive tape for coating protection, as in Example 1,
A paper business card was covered and protected in a San-Germanic manner to produce a composite as shown in FIG. Since this composite has a relatively large adhesive force between the adhesive surfaces, the effect of protecting the business card from being covered was almost satisfied. However, after leaving it in an oven at 80 ° C for 7 days, the adhesive tape with the adhesive surfaces stuck together is peeled off, and when the protection of the business card is to be released, the adhesive surface of the adhesive tape is removed. Since the business card was sticky at room temperature and strongly adhered to the business card, the business card was torn and the paste was left on the business card surface, contaminating the business card significantly.

Comparative Example 4 The adhesive tape for coating protection prepared in Comparative Example 3 and a non-adhesive sheet as described above had an adhesive force of 2.5 kg / 2.
Using a polycarbonate film having a width of 0 mm and a thickness of 50 μm, a paper business card was covered and protected in a San-Germanic manner in the same manner as in Example 2 to produce a composite as shown in FIG. Since the adhesive strength of the adhesive tape to the non-adhesive sheets was relatively large, the composite almost satisfied the effect of protecting the cover of the business card. However, after leaving it in an oven at 80 ° C for 7 days, the adhesive tape is peeled off, and the protection of the business card is released. The business card was strongly adhered to the business card, and the business card was torn, and the business card was markedly contaminated by adhesive residue on the business card surface.

Comparative Example 5 Styrene-Isoprene-Styrene Block Polymer ("Califlex TR1107" manufactured by Ciel Chemical Co., Ltd.) 10
0 parts, 50 parts of petroleum resin, and 1 part of phenolic antioxidant were dissolved in 150 parts of toluene to prepare a pressure-sensitive adhesive composition solution. This adhesive composition solution was applied on a 38 μm-thick PET film by an applicator and dried at 100 ° C. for 3 minutes to form a layer made of the 50 μm-thick adhesive composition. Further, aging was carried out in an atmosphere of 50 ° C. for 2 days to prepare an adhesive tape for coating protection.

This adhesive tape for protecting the coating has a solvent insoluble content of 0% by weight in the layer composed of the adhesive composition, has tackiness at room temperature, and has a self-adhesive force of 1.6 kg / 20 mm width. Atsuta.
Using this adhesive tape for coating protection, as in Example 1,
A paper business card was covered and protected in a San-Germanic manner to produce a composite as shown in FIG. Since this composite has a relatively large adhesive force between the adhesive surfaces, the effect of protecting the business card from being covered was almost satisfied. However, after leaving it in an oven at 80 ° C for 7 days, the adhesive tape with the adhesive surfaces stuck together is peeled off, and when the protection of the business card is to be released, the adhesive surface of the adhesive tape is removed. Since the business card was sticky at room temperature and strongly adhered to the business card, the business card was torn and the paste was left on the business card surface, contaminating the business card significantly.

COMPARATIVE EXAMPLE 6 The adhesive tape for coating protection prepared in Comparative Example 5 was used as a non-adhesive sheet to have an adhesive force of 2.5 kg / 2.
Using a polycarbonate film having a width of 0 mm and a thickness of 50 μm, a paper business card was covered and protected in a San-Germanic manner in the same manner as in Example 2 to produce a composite as shown in FIG. Since the adhesive strength of the adhesive tape to the non-adhesive sheets was relatively large, the composite almost satisfied the effect of protecting the cover of the business card. However, after leaving it in an oven at 80 ° C for 7 days, the adhesive tape is peeled off, and the protection of the business card is released. The business card was strongly adhered to the business card, and the business card was torn, and the business card was markedly contaminated by adhesive residue on the business card surface.

[0063]

As described above, in the present invention, polycarbonate sheets are provided on a substrate as adhesive sheets which are closely adhered to the surface of the article and cover and protect the article by an adhesive seal at the peripheral portion. Business cards, etc. by using a layer having a layer of a pressure-sensitive adhesive composition that is mainly composed of a polyester having a polyester structure and is non-adhesive or slightly adhesive at room temperature and exhibits self-adhesiveness by appropriately crosslinking the polyester. In this case, it is possible to sufficiently protect the article from covering, and to avoid damage or contamination of the article when the covering protection is released.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example in which a business card (article) is covered and protected by using the adhesive sheet for covering protection of the present invention.

FIG. 2 is a cross-sectional view showing another example in which a business card (article) is covered and protected using the adhesive sheet for covering protection of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adhesive sheet for coating protection 10 Substrate 11 Layer composed of adhesive composition 2 Non-adhesive sheet 3 Business card (article) 3a (3b) Front (back) 4,5 Adhesive seal part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Yamamoto 1-2-1, Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation

Claims (3)

[Claims] 1. An adhesive sheet which is closely attached to the surface of an article and covers and protects the article with an adhesive seal at a peripheral portion,
On a substrate, the following formula: (R is a linear or branched hydrocarbon group having 2 to 20 carbon atoms) having a weight average molecular weight of 30,000 or more containing a polycarbonate structure as a main component. Crosslinking to make solvent insoluble content 1-50% by weight
Self-adhesive force of 1 kg / 20 mm width or more, and a layer comprising a non-adhesive or slightly-adhesive adhesive composition at room temperature; 2. The adhesive surface of the adhesive sheet for covering protection according to claim 1 is brought into close contact with the surface of the article, and the adhesive surfaces are bonded to each other at a peripheral portion to form an adhesive seal portion. Wherein the article is covered and protected only by the above-mentioned adhesive sheets. 3. A non-adhesive sheet having an adhesive force of 1 kg / 20 mm width or more at the periphery of the article by closely adhering the adhesive surface of the adhesive sheet for covering protection according to claim 1 to the surface of the article. -It is characterized in that the article is covered and protected between the above-mentioned adhesive sheet and the above-mentioned non-adhesive sheet by forming an adhesive seal portion by sticking to the sheets. Coating protection method.