JPH07258614A - Heat-sensitive tacky adhesive material - Google Patents

Abstract

PURPOSE:To provide a tacky adhesive label produced by applying a heat- sensitive tacky adhesive developing tacky adhesivity with heat to one surface of a substrate and enabling the pasting of the label by partially heating the label. CONSTITUTION:This tacky adhesive label 10 is produced by applying a heat- sensitive tacky adhesive layer 12 developing tacky adhesivity with heat to a surface of a substrate 11. The label 10 is partially heated from the side of the substrate to partially form a tacky adhesive part 12a at a prescribed part of the tacky adhesive material layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive adhesive material for use in labels, tapes and the like for attaching to adherends such as paper, wood, metal and plastic boxes and bottles and bulletin boards. Regarding

[0002]

2. Description of the Related Art Conventionally, a method of forming an adhesive label or a striped adhesive tape by punching or slitting from an adhesive material obtained by applying an adhesive to a substrate has been generally performed. However, these adhesive labels and adhesive tapes have a problem that when air is entrapped (air bubbles enter) or peeled off, a part of the adhesive remains on the adherend and is contaminated. On the other hand, an adhesive material partially provided with an adhesive layer so that it can be easily peeled off after being attached to an adherend due to the necessity of re-adhesion and to prevent air inclusion. Is manufactured by the coating method described below.

One method is to coat a small piece of plastic or the like so as not to partially supply the adhesive on the substrate when the adhesive is applied by a coating device such as knife coating, lip coating or roll coating. It was attached to the head of the device to form an uncoated portion parallel to the flow direction of the base material, and stripe-shaped adhesive coated portions parallel to the flow direction were alternately provided to manufacture the adhesive material. .

As another method, a pressure-sensitive adhesive layer is provided on a base material by coating by a gravure printing method, and it can be partially applied in an arbitrary shape in a so-called spot shape.

[0005]

However, in the former case described above, the adhesive could only be applied in stripes parallel to the flow direction. Further, in the latter coating by the gravure printing method, there is a problem that the transfer of the pressure-sensitive adhesive to the substrate is more difficult than that of the gravure plate cells (fine recesses in the gravure plate), and the coating quality becomes extremely unstable.

In view of the above, the present invention provides a heat-sensitive adhesive agent, which produces tackiness when heat is applied, on one or both sides of a substrate, and partially heats it to enable sticking to prevent air inclusion. An object is to provide a heat-sensitive adhesive material that

[0007]

In order to achieve the above object, the present invention provides a heat-sensitive adhesive layer (12) on one surface or both surfaces of a substrate (11), which becomes sticky when heated. The heat-sensitive adhesive material is characterized in that the adhesive material (10) is partially heated and an adhesive portion (12a) is provided at a predetermined portion of the adhesive layer.

The present invention will be described in detail. The heat-sensitive adhesive layer (12) can be provided on both sides of the base material (11). When the heat-sensitive adhesive layers are provided on both sides, release paper is applied to both sides, and by partially heating from the release paper side, the adhesive layers (12a) on both sides partially adhere to the adhesive part (12a). ) Can be provided.

The heat-sensitive adhesive according to the present invention has a pressure-sensitive adhesive layer (basic composition) comprising a polymer material, a tackifier and a solid plasticizer. This pressure-sensitive adhesive is a pressure-sensitive adhesive that is not sticky at room temperature, but becomes sticky by heating and continues for a considerable period after cooling. Usually, the dry coating film of this pressure-sensitive adhesive has no tackiness, and a release paper is not necessary ("Adhesion Handbook", 12th edition, Polymer Publishing Association, 1980).

The above-mentioned polymer material is a component which gives an adhesive force, and is, for example, polyvinyl acetate, copolyethylene-vinyl acetate, polyacrylic ester type, polyvinyl chloride type, natural rubber, synthetic rubber, polyester type, polyurethane type. Polymer compounds can be appropriately selected and used.

The tackifier is a component for enhancing the tackiness when activated by heating, and for example, resins such as longines derivatives, terpene resins, petroleum resins, phenol resins and xylene resins. Can be used.

The solid plasticizer is solid at room temperature and melts when heated above its melting point to swell and dissolve the polymer material and tackifier to develop tackiness. Once melted, it does not crystallize easily, so the adhesive holding time after heat activation can be extended. For example, organic compounds that are solid at room temperature, such as diphenyl phthalate, dihexyne phthalate, dicyclohexyl phthalate, dihydroabietyl phthalate, and ethylene glycol benzoate.

The above materials are appropriately selected and mixed with a lower alcohol solvent to prepare a heat-sensitive adhesive composition. This composition is applied to one side or both sides of a substrate and dried to prepare an adhesive material. This adhesive can be applied by a general coating apparatus such as gravure coating, knife coating, lip coating, and roll coating, but it is preferable to use a gravure coating apparatus that enables thinner and more accurate coating. Good.

A substrate (11) provided with a heat-sensitive adhesive
As high quality paper, art paper, vinyl chloride film, P
Various materials such as E film, PET film, and metal foil can be used depending on the application.

The adhesive material (10) can be made to have a strong adhesive property by heating the entire surface of the adhesive material after temporarily providing the adhesive portion (12a) and temporarily adhering. . In addition, the adhesiveness obtained by heating can be permanently adhered to an adherend because the adhesive layer is solidified after a certain period of time to lose adhesiveness and has adhesiveness. However, it is possible to regenerate the tackiness by heating after the adhesion, so that it can be easily peeled off at the time of replacement or the like, and can be adhered again.

[0016]

The pressure-sensitive adhesive material (10) of the present invention is provided with a heat-sensitive pressure-sensitive adhesive layer (12) which becomes sticky when heated, and this pressure-sensitive adhesive is not sticky at room temperature and is heated in a heated place. The adhesive portion (12a) is generated only in the adhesive of (1). Further, even when the temperature returns to room temperature, the portion can retain the adhesive force for a long period of time, and the adhesive solidifies to give adhesiveness. As a result, the partially heated adhesive material can be easily peeled from the non-heated portion, and the heated portion can retain its adhesive force for a long period of time, so that it can be re-attached and solidified and bonded. When the pressure-sensitive adhesive material is heated with hot air or the like, it becomes tacky again and can be easily peeled off, and even if peeled off, the pressure-sensitive adhesive does not remain on the adherend. Furthermore, when it is used as a protective (covering) label or protective tape, it is possible to heat only the periphery of the part to be protected to form an adhesive part, so the part to be protected is contaminated with the adhesive. There is no.

[0017]

Embodiments will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a structure of an adhesive material (a) provided with a heat-sensitive adhesive according to the present invention on one side of a substrate and an adhesive material (b) provided on both sides of the substrate. In addition, FIG. 2 is an explanatory diagram showing a state in which the adhesive material is partially heated from the base material side and an adhesive portion is partially provided.

The adhesive material (10) of the present invention is shown in FIG.
As shown in, a heat-sensitive adhesive layer (12) is provided on one surface of the base material (11), and the base material (11) is partially heated to an arbitrary shape and size from the side, and The pressure-sensitive adhesive layer (12) in the heated portion is provided with a pressure-sensitive adhesive portion (12a).

The pressure-sensitive adhesive material provided with this pressure-sensitive adhesive layer (12) is obtained by partially heating an arbitrary portion of the base material (11), and thus the surface of the pressure-sensitive adhesive layer (12) corresponding to the heated portion. The adhesive portion (12a) is formed on the surface of the substrate, so that it can be attached to the adherend. The heating from the side of the base material is a partial heating in an arbitrary shape and in an arbitrary size. For example, partial heating in a triangular shape, a square shape, a circular shape, or a stripe shape, a mesh shape, or the like. It can be appropriately selected according to the required size such as heating into various geometric patterns (see FIG. 3).

Although not shown in the drawing, this heating method includes a stamper having an arbitrary shape and a pattern of an arbitrary size and a built-in heater or a heater, a thermal head controlled by a computer, a heating lamp, etc. It can be appropriately selected. Further, the adhesive material before partial heating may be partially heated by an electric trowel or the like to be attached manually. These heating temperatures produce an adhesive force when heated at 50 ° C. or higher.

This adhesive material is heated at an arbitrary position on a coating device for applying an adhesive, and the adhesive portion (12
When forming a), it is necessary to insert and receive a release paper on the side of the pressure-sensitive adhesive layer (12), but when heated immediately before use, this heat-sensitive pressure-sensitive adhesive does not produce adhesive strength at room temperature. Therefore, release paper is not required. Further, by applying a release agent to one surface of the base material (11) in advance, it is possible to wind up the release paper without the need for release paper even if adhesiveness is generated due to partial heating (not shown). ).

As shown in FIG. 1 (b), the substrate (1
When the pressure-sensitive adhesive layer (12) is provided on both sides of 1), it is possible to apply release paper to both sides and heat the release paper on both sides to form the adhesive portion, although not shown. Yes, and when partially heating the adhesive layers on both sides,
The shape of heating may be the same for both the front and back sides, or different shapes for the front and back sides can be used, and it is also possible to provide the adhesive portion by heating at different places on the front and back sides.

[0023]

The pressure-sensitive adhesive material of the present invention is provided with a heat-sensitive pressure-sensitive adhesive layer which becomes sticky when heated, and this pressure-sensitive adhesive is not sticky at room temperature, and only the pressure-sensitive adhesive at a heated location is used. Stickiness occurs in the. Further, even when the temperature returns to room temperature, that portion can retain the adhesive force for a long period. Due to this, the partially heated adhesive material can be easily peeled from the non-heated portion, and even when adhered to an adherend made of a material that does not allow air to pass through, such as a plastic film,
Do not trap air between the material and the adherend. Further, since the heated portion can retain the adhesive force for a long period of time, it can be re-attached, and even when peeled off, the adhesive does not remain on the adherend. In addition, when used for protective (covering) labels or protective tape, heating only around the part to be protected causes tackiness, so the part to be protected is not contaminated with adhesive. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a constitution of an adhesive material (a) having a heat-sensitive adhesive provided on one side of a substrate of the present invention and an adhesive material (b) having a heat-sensitive adhesive layer provided on both sides of the substrate. is there.

FIG. 2 is an explanatory diagram showing a situation in which a pressure-sensitive adhesive material is partially heated from a base material side and a pressure-sensitive adhesive portion is partially provided.

FIG. 3 is an explanatory view (a) (b) showing an example in which the adhesive material according to the present invention is partially heated in an arbitrary shape and in an arbitrary size to provide a partial adhesive portion.

[Explanation of symbols]

 10 ... Adhesive material 11 ... Substrate 12 ... Thermosensitive adhesive layer 12a ... Adhesive part 15 which is heated to produce adhesiveness 15 ... Partial heating

Claims (1)

[Claims] 1. A pressure-sensitive adhesive material having a heat-sensitive pressure-sensitive adhesive layer on one or both sides of a substrate, which is not tacky at room temperature and is tacky when heated. The heat-sensitive adhesive material is characterized in that an adhesive portion is provided at a predetermined position of.