JPH0532943A - Composite ribbon for forming adhesive pattern - Google Patents

Abstract

PURPOSE:To provide a ribbon for forming an adhesive pattern and capable of forming an adhesive layer having an arbitrary pattern on the surface of a receptor. CONSTITUTION:The objective ribbon for forming an adhesive pattern is composed of (A) an adhesive layer consisting of the 1st layer free from tacky adhesivity or having weak tacky adhesivity at ordinary temperature and exhibiting adhesivity by heating and the 2nd layer exhibiting adhesivity at ordinary temperature or by heating and formed on the 1st layer in a state immiscible with the 1st layer under hot pressing condition and (B) a releasable film base applied to the surface of the 2nd layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a novel adhesive layer forming system, and more particularly, it is suitable for forming an adhesive pattern having a desired shape on the surface of a desired article. The present invention provides a method for forming an adhesive pattern and a composite ribbon useful for forming the adhesive pattern.

[0002]

2. Description of the Related Art There are two known methods for joining two articles using an adhesive technique. One is a method using a so-called adhesive, and the other is a method using a processed product of an adhesive material such as a double-sided adhesive tape or sheet.

The former adhesive method is to apply an adhesive liquid such as a solvent or an emulsion to one or both surfaces of the articles to be joined, and to keep them stationary by superimposing them. This is a method in which an activating adhesive is applied to one or both surfaces of an article by using a heating device, and the both are superposed and kept stationary. However, when using an adhesive solution such as a solvent or an emulsion system, it takes time to dry the both immediately after coating and obtain the desired adhesive strength, or it is necessary to temporarily stand still after overlapping. However, there is a problem of environmental pollution due to release of solvent and the like into the atmosphere. Further, when the heat-activatable adhesive is used, many inconvenient problems when using the adhesive liquid are solved, but a heating device and a large amount of heat capacity are required.

The latter method, which uses a processed product of a double-sided adhesive tape or sheet, solves many drawbacks when the above adhesive is used because the front and back surfaces of the processed product generally have excellent pressure-sensitive adhesiveness. It is so versatile. Then, if the processed product is, for example, a punched product punched into a window frame shape,
If the punched product is relatively small, there are few parts to be discarded, so there is little economic disadvantage, but if it is large, there are many parts to be discarded, which is extremely expensive compared to the actual used area. Is to have.

Recently, as a method of forming an adhesive layer in a pattern such as a window frame, for example, Japanese Patent Application Laid-Open No. 3-5428.
In the publication No. 1, a pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer and a layer mainly composed of a low-melting point compound are sequentially formed on a separator is used, and the separator surface of the sheet is partially heated by using a thermal printer or the like to form a heated portion. There has been proposed a method of forming an agent image on the surface of a transferred material.

According to the above-mentioned method, however, the outermost layer of the sheet, that is, the surface in contact with the material to be transferred is substantially non- or weakly tacky mainly composed of higher fatty acids and their esters or higher alcohols. Since it is composed of the low melting point compound, the adhesiveness at the interface between the transferred material and the formed pressure-sensitive adhesive pattern is insufficient, and the desired adhesive strength cannot be obtained, so that it cannot be put to practical use.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to develop a composite ribbon for forming an adhesive pattern, which adheres the adhesive layer provided on the surface of the film-shaped substrate to the transfer target without waste. And

[0008]

Means for Solving the Problems The inventors of the present invention apply a composite ribbon composed of a film-like base material and a specific adhesive layer when applying the adhesive layer to the surface of a transfer target (article). The present invention was completed by finding that the adhesive layer can be used without waste and can be firmly adhered to the surface of the transferred material by overlapping the surface of the transferred material and operating the heating head as instructed by the computer. It is a thing.

That is, in the present invention, the adhesive layer is composed of at least the first layer and the second layer, and the adhesive layer of the first layer is non- or weakly viscous adhesive at room temperature and is activated by heating to be strong. The adhesive composition of the second layer is formed of a compounded composition exhibiting tacky adhesiveness, and the adhesive composition of the second layer is formed of a compounded composition exhibiting strong viscous adhesiveness at room temperature or by heating, and the two adhesive layers are heated. It is intended to provide a composite ribbon for forming an adhesive pattern in which a compounding composition that is substantially not mixed under pressure is selected, and a peelable film-like substrate is provided on the surface of the second layer.

[0010]

The composite pattern forming composite ribbon of the present invention comprises at least a first layer and a second layer of adhesive layers.
It is composed of a peelable film substrate provided on the surface of the second layer. The first and second adhesive layers each constitute an outer layer of the adhesive layer, and a space between the first and second adhesive layers is strong against these layers. One or more intermediate layers to be bonded may be interposed. The peelable film-like substrate is obtained by superposing the adhesive pattern-forming composite ribbon of the present invention on the surface of the transferred material through the first layer, and heating and pressurizing the film-like substrate surface with a heating head. Only the adhesive layer in the heating and pressurizing portion is transferred to the surface of the transfer target material, and has a releasability to the extent that no adhesive layer remains on the surface of the film-shaped substrate.

The compounding composition forming the first and second adhesive layers can use many commonly known adhesive substances, for example, alkyl ester type, urethane type, natural or synthetic rubber. Examples thereof include alkyl ester type, but from the viewpoint of easy availability, alkyl ester type is preferable.

It is essential that the adhesive layer of the first layer is non- or weakly viscous adhesive at room temperature, which means that when the ribbon is placed on the surface of the transfer target, the self-weight of the ribbon. The term "adhesiveness" means that it does not adhere to the surface of the transferred material. The adhesive layer constituting the first layer is formed of a compounded composition which is non- or weakly viscous adhesive at room temperature and at the same time exhibits strong adhesiveness by heating. As an acrylic copolymer pressure-sensitive adhesive material of an alkyl ester of acrylic acid having an alkyl group having 2 to 14 carbon atoms and a monoethylenically unsaturated monomer copolymerizable with the alkyl ester of acrylic acid, Examples of the heat-adhesive composition include a heat-meltable resin.

The alkyl ester of acrylic acid having 2 to 14 carbon atoms in the alkyl group used in the present invention includes, for example, ethyl acrylate, butyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate and iso Examples thereof include monomers such as octyl acrylate, isononyl acrylate, decyl acrylate, and dodecyl acrylate, and one or more of these are used.

The copolymerizable monoethylenically unsaturated monomer used in the present invention is a copolymer of the acrylic acid alkyl ester to introduce a functional group or polar group to improve the adhesiveness or copolymerization. It controls the glass transition temperature of the coalescence to improve cohesive strength and heat resistance, and is a polymerizable monomer having a carboxyl group such as acrylic acid, maleic acid, itaconic acid, and 2-hydroxyethyl acrylate. Polymerization monomer having hydroxyl group such as ester, acrylic acid-2-hydroxypropyl ester, 2-hydroxy vinyl ether, etc. Polymerization having amino group such as N · N-dimethylaminoethyl acrylate, N-tert-butylaminoethyl acrylate Monomers, polymerizable monomers with amide groups such as acrylamide and methacrylamide, glycidyl Acrylate, a polymerizable monomer having a glycidyl group such as glycidyl methacrylate, other sulfopropyl acrylate, N- vinyl caprolactam, acrylonitrile, vinyl acetate and the like, one or two or more of them are used.

The above-mentioned alkyl acrylate and the monoethylenically unsaturated monomer copolymerizable with the above alkyl acrylate are 70 to 100% by weight, preferably 85% by weight of the alkyl acrylate as a main component on a monomer basis. ~ 100% by weight
And the copolymerizable monoethylenically unsaturated monomer is 30 to
From the viewpoint of adhesiveness and cohesive force, it is preferable that the amount is 0% by weight, preferably 15 to 0% by weight.

The heat-fusible resin used in the present invention is a component that imparts adhesive retention to the adhesive layer, and comprises the acrylic acid alkyl ester and the monoethylenically unsaturated monomer copolymerizable therewith. Has a good compatibility with the acrylic copolymer-based pressure-sensitive adhesive substance and is solid at room temperature, preferably having a melting point of 50 ° C. or higher, more preferably a melting point of 70 to 2
It is in the range of 00 ° C. For example, an epoxy resin, a phenol resin, a xylene resin, a rosin, etc. are mentioned, and these are used 1 type or 2 types or more.

The above-mentioned hot-melt resin is blended to such an extent that the pressure-sensitive adhesive property of the above-mentioned acrylic copolymer pressure-sensitive adhesive substance is substantially lost at room temperature. 35 to 100 parts by weight of pressure-bonding substance
It may be added in an amount of 180 parts by weight, preferably 50 to 150 parts by weight. If the amount is 35 parts by weight or less, the tackiness of the acrylic copolymer-based pressure-sensitive adhesive material at room temperature becomes insufficient, and if it exceeds 180 parts by weight, the adhesive layer Has a high elastic modulus and becomes unsuitable for the transferred material, which is not preferable.

As described above, the first layer comprising the acrylic copolymer pressure-sensitive adhesive substance and the heat-fusible resin is completely or almost weakly adhesive at room temperature, that is, non- or weakly adhesive. By applying a temperature of 90 to 350 [deg.] C. for a moment or several seconds and applying pressure thereto, it is possible to obtain an adhesive that exhibits an adhesive strength of about 50 to 2500 g / 20 mm.

The adhesive layer of the first layer can be composed of a mixed system of an acrylic copolymer pressure-sensitive adhesive substance and a heat-fusible resin as described above. Typical examples are ethylene-vinyl acetate copolymers. The heat-activatable adhesive layer may be a heat-activatable adhesive layer made of a heat-adhesive resin such as an ethylene polymer or a polyamide resin, or a mixed system containing these resins. In any of the above cases, the thickness of the first adhesive layer is 50 μm or less, preferably 30 μm or less, and practically in the range of 0.3 to 20 μm.

The second adhesive layer is about 300-2 at room temperature.
It exhibits a strong viscous adhesive property of 500/20 mm, and many of the above materials can be used as its material. For example, the acrylic copolymer feel used to form the adhesive layer of the first layer. It can be composed of a mixed system of a pressure-adhesive substance and a heat-meltable resin, but by reducing the amount of the heat-meltable resin from this mixed system, the pressure-sensitive adhesive property of the acrylic copolymer pressure-sensitive adhesive substance is substantially increased. It may be a system in which the resin is not eliminated, or a system in which no resin is added.

The pressure-sensitive adhesive layer may be a mixed system containing an ethylene copolymer typified by an ethylene-vinyl acetate copolymer or a heat-adhesive resin such as a polyamide resin. . In any of the above cases, the thickness of the second adhesive layer is about 50 μm or less, preferably 30 μm or less, and practically in the range of 0.3 to 20 μm.

However, the composition of the adhesive compound of the first layer and the composition of the second layer may be physically or chemically different from each other or may be the same. It must be selected in a combination that does not mix depending on heat and pressure.

The adhesive layer composed of such first and second layers has a total thickness of 100 μm or less, preferably 60 μm.
m or less, and practically in the range of 0.6 to 40 μm, but the thickness ratio of the first layer to the second layer is 0.1: 9.9 to 5:
A value of 5 is preferable.

A colorant, a pigment, a filler, a softening agent, a conductive substance and the like can be added to the adhesive layers constituting the first layer and the second layer in appropriate amounts, if necessary. The addition of a substance such as a metal powder, a metal fiber powder, or a powder surface-treated with a conductive substance is preferable because it can efficiently transfer the heat (including high frequency heating) applied to the ribbon of the present invention in a short time.

On the second layer surface of the adhesive layer composed of the first layer and the second layer as described above, a film-like substrate which can be peeled from the second layer surface is provided. As the base material, a flexible and heat-resistant film-like material is often used as long as the surface has low adhesiveness to the adhesive substance. Typical film-like substrates include a polyester film typified by polyethylene terephthalate or a laminated film of the film and another film, and a film of a low adhesive resin typified by a silicone resin on the surface of these films. It is a film provided with.

The composite ribbon for forming an adhesive pattern, which comprises the first layer, the second layer and the peelable film-like substrate in this order, can be prepared by a conventional method. One of the production methods is a method in which the adhesive of the second layer is applied or laminated on the surface of the film-shaped substrate by a generally known method, and the adhesive of the first layer is applied or laminated on the surface of the adhesive layer. In addition, the first and second adhesives are co-extruded from the die and the extruded second adhesive
This is a method of sticking a peelable film-like substrate to the adhesive layer surface of the above. Another method is a method in which the first layer and the second layer are separately manufactured on the surface of the film-shaped substrate, and the layers are bonded together. The composite ribbon thus produced is usually wound into a roll with the film-shaped substrate surface facing outward.

This composite ribbon for forming an adhesive pattern is rewound and superposed on the surface of a post-transferring object (article) via the first adhesive layer. At this time, since the adhesive layer of the first layer is configured to have non- or weakly viscous adhesion at room temperature, it is possible to cause the surface of the transfer target (article) to travel without difficulty.
Then, the film-shaped base material surface of the overlapping portion is heated and pressed in a desired pattern by a heating head of a thermal transfer printer or the like to soften or melt the adhesive layer of the first layer to form an object on the surface of the transfer target (article). The adhesive layer having the following pattern is transferred and adhered, and then the ribbon is peeled off to form an adhesive layer which is sticky at room temperature on the surface of the transfer target (article). If necessary, another transfer target (article) is attached to the formed adhesive layer surface.

[0027]

EFFECTS OF THE INVENTION The composite ribbon for forming an adhesive pattern of the present invention has a non-contact or weakly viscous adhesive surface for contact with the transferred material, so that the composite ribbon can run on the transferred material surface and the transferred material can be transferred. The adhesiveness to the body is that it can be firmly adhered by heating, and the target patterned adhesive layer can be formed with less waste of the adhesive. In particular, since the first layer and the second layer of the adhesive layer are composed of a non-mixed system that does not mix even when heated and pressed,
None of the layers is modified or denatured by heating and pressing, and the desired adhesive strength can be obtained.

[0028]

EXAMPLES Next, examples of the present invention will be described and specifically described. In the following, "parts" means "parts by weight".

Example 1 Formulation of Adhesive for First Layer and Formation of Layer Butyl acrylate: acrylic acid = 97: 3 (weight ratio)
An acrylic copolymer pressure-sensitive adhesive material solution (average weight molecular weight 300,000) solution-polymerized (45%) is prepared at the ratio of.
Epoxy resin (melting point 110
100 ° C.) and added and mixed to a thickness of 12
1 μm of a releasable film-like substrate made of a polyester film (having a silicone resin coating formed on the surface) so that the thickness after drying is 3 μm, and 1
Dry at 00 ° C for 2 minutes. The adhesive layer after drying showed almost no viscous adhesiveness, and was bonded to a stainless steel plate finished with BA for measurement by applying a pressure of one reciprocation with a 2 kg roll at room temperature to measure the adhesive force. However, it showed a 180-degree adhesive strength of 10 g / 20 mm (pulling speed: 300 m / min).

Second Layer Adhesive Formulation Composition and Layer Shape
Forming an epoxy resin was added and mixed 15 parts of the solid content: 100 parts of acrylic copolymer sensible adhesive agent solution used in the first layer, drying the mixture to one surface of the film-form substrate capable of peeling of the Apply it to a thickness of 10 μm and apply 1
Dry at 00 ° C for 3 minutes. When the 180 degree adhesive force was measured in the same manner as above, it was 900 g / 20 mm.

Adhesive Pattern Forming Composite Ribbon The first and second layers of the adhesive film are laminated together by adhering the adhesive layers to each other, and a pressure of one reciprocating movement is applied with a roll of 2 kg under heating, followed by a width of 15 mm. Was cut into a tape shape, the film on the first layer side was peeled off, and the film was wound around a cylindrical bobbin in a roll shape.

The tape roll-shaped composite ribbon was set in a line type thermal transfer printer, and stainless steel foil (thickness 50 μm
m) linear pattern with a width of 10 mm on the surface (10 cm in length)
Was printed. The print pattern had a straight outer contour, the adhesive layer had good adhesiveness, and no mixing of the first and second layers was observed.

For the measurement, a width of 1 is printed on the surface of the printed pattern.
When 0 mm stainless steel foil was laminated and heated at 100 ° C. for 1 minute to make an adhesive force of 180 degrees, the adhesive layer of the second layer was cohesively broken, and peeling between the adhesive layer of the first layer and the stainless steel foil was recognized. There wasn't.

Example 2 A polyamide resin was prepared as the first adhesive layer, and 100 parts of ethylene-vinyl acetate copolymer (vinyl acetate content 28% by weight) and rosin resin were used as the second adhesive layer. Prepare a mixture with 100 parts, put this into each hopper of a two-layer extruder and extrude two layers with a thickness of 3 μm on the first layer side and 15 μm on the second layer side, and use in Example 1 on the second layer side. The peelable film-like substrate was attached and wound into a roll.

A tape-rolled composite ribbon was prepared from this roll-shaped product in the same manner as in Example 1, and the printing characteristics and adhesive strength were measured in the same manner. The outline of the print pattern is linear. No mixing of the first and second layers is observed. The 180 degree adhesive force between the second adhesive layer and the stainless steel foil was 1010 g / 20 mm. No peeling between the first adhesive layer and the stainless steel foil was observed.

Comparative Example The second layer adhesive of Example 1, namely butyl acrylate:
Acrylic acid = 97: 3 (weight ratio) solution polymerization (4
5%) Acrylic copolymer pressure-sensitive adhesive substance solution (average weight molecular weight 300,000) 15 parts of epoxy resin (melting point 110 ° C.) was added to 100 parts of solid content, and the mixture was peeled off. The coated substrate is coated on one side with a thickness after drying of 10 μm and dried at 100 ° C. for 3 minutes. 900g when measuring 180 degree adhesive strength as above
It was / 20 mm. A mixed solution of acrylic resin: carnauba wax: solvent = 1: 4: 45 (weight ratio) was applied to the surface of the adhesive layer so that the thickness after drying was in the range of 2 to 3 μm, and the composite ribbon ( Tape roll shape) was prepared.

When the printing characteristics and the adhesive force of this ribbon were measured, the outline of the printing pattern as shown below was substantially linear. The first layer (wax layer) is mixed with the second layer and hardly remains. The 180 degree adhesive strength of the adhesive layer to the stainless steel foil on the wax layer side was 200 g / 20 mm.

Claims (4)

[Claims] 1. An adhesive layer is composed of at least a first layer and a second layer, and the adhesive layer of the first layer is non- or weakly viscous adhesive at normal temperature and is activated by heating to have strong viscous adhesiveness. The adhesive layer of the second layer is formed of a compounded composition that exhibits strong viscous adhesion at room temperature or by heating, and the two adhesive layers are substantially heated and pressurized. A composite ribbon for forming an adhesive pattern, wherein a blended composition that is not mixed with each other is selected, and a peelable film-like substrate is provided on the surface of the second layer. 2. An adhesive layer of the first layer, which is non- or weakly viscous adhesive at room temperature and exhibits strong viscous adhesiveness by heating, is made of an acrylic copolymer pressure-sensitive adhesive substance and the pressure-sensitive adhesiveness of the substance. The composite ribbon for forming an adhesive pattern according to claim 1, which is composed of a heat-meltable resin which is blended to such an extent that it is substantially eliminated. 3. The adhesive pattern formation according to claim 1, wherein the adhesive layer layer of the first layer which is non- or weakly adhesive at room temperature and exhibits strong adhesiveness by heating is a heat-activatable adhesive layer. Ribbon for use. 4. The adhesive layer which exhibits strong viscous adhesion at room temperature or by heating so that the acrylic copolymer pressure-sensitive adhesive substance and the pressure-sensitive adhesive property of the substance are not substantially lost. The composite ribbon for forming an adhesive pattern according to claim 1, which is composed of a blended hot-melt resin.