JPH11323265A - Adhesive tape of polystyrene film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polystyrene-based adhesive tape soluble in d-limonene, used for stopping or sealing terminal of polystyrene-based film, container, etc., for packaging used in a method for dissolving a container, a cushioning material, etc., made of foamed polystyrene into d-limonene and recovering the container, the cushioning material, etc. SOLUTION: This adhesive tape of polystyrene film is obtained by applying a UV curable silicone-based mold-releasing agent onto either one surface of a polystyrene film having 30 μm thickness and applying a rubber-based tacky agent onto the other surface so that the rubber-based tacky agent has 30 μm thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to d-limonene which is a solvent capable of reducing the volume of recycled polystyrene waste materials such as packaging materials, cushioning materials and containers which are no longer needed and recycling the same. Related to adhesive tape.

[0002]

2. Description of the Related Art Expanded polystyrene is used as a material for various boxes (containers) such as fish boxes, as a cushioning material for foods and trays, and as a packaging material for home appliances and audiovisual (AV) equipment. However, there is a problem in how to treat a large amount of waste materials generated after use.

[0003] In particular, recently, with respect to the treatment of this waste, a recycling technique has been required. As a processing method, a recycling technique by heat treatment (melting treatment) is also performed, but at present, most of the waste materials are landfilled or incinerated.

[0004] The reason is that the heat treatment method has a problem that the physical properties of the regenerated polystyrene are reduced by heating, and there is a difficulty in recycling.

[0005]

Recently, as a technology for recycling expanded polystyrene, which is an alternative to the heat treatment method, a dissolution method using a solvent which causes little deterioration (deterioration) of the physical properties of polystyrene has been developed, and a natural solvent extracted from citrus as this solvent. D-limonene, a kind of vegetable oil, is used.

[0006] As a method for recovering expanded polystyrene using d-limonene, waste expanded polystyrene is put into a polystyrene-based bag, and is put into a dissolving tank containing d-limonene while remaining in the bag. When dissolving the foamed polystyrene waste material by spraying limonene, the conventional adhesive tape used for terminating the terminal does not dissolve the base material of the adhesive tape and / or the adhesive in d-limonene. The adhesive tape used for the stopper may have various adverse effects, and it is necessary to remove the adhesive tape from the polystyrene bag by removing it one by one.

Further, in the case of an adhesive tape used for sealing a fish box or a tray, fixing a terminal, or the like, it is necessary to peel off the adhesive tape at the time of recovering the polystyrene from the expanded polystyrene container or the like as a waste as described above. there were.

Accordingly, the present invention does not require peeling off the terminal-stopping adhesive tape adhered to the polystyrene-based bag, and does not peel off the adhesive tape used for sealing fish boxes or trays or terminal-stopping, without removing the d-type adhesive tape. An object of the present invention is to provide a pressure-sensitive adhesive tape that can be subjected to a recycling step of a dissolution method using a limonene solvent.

[0009]

According to the present invention, there is provided a polystyrene film adhesive tape obtained by laminating an adhesive on at least one surface of a polystyrene film as a base material.
-A polystyrene film adhesive tape characterized by dissolving in limonene, wherein both the base material and the adhesive are dissolved in d-limonene, so that it is used as an end-stopping adhesive tape for a polystyrene-based bag for collection of waste polystyrene foam. However, the adhesive tape does not need to be peeled off, and it can be used for sealing fish boxes and trays and fixing the terminal, and can be subjected to a recycling process by a limonene dissolution method without peeling off the adhesive tape after use.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
As the polystyrene-based film used in the present invention, any film having a thickness of about 10 to 100 μm and soluble in d-limonene can be used. For example, commercially available cellomers (manufactured by Okura Industry Co., Ltd.), Santoclear (manufactured by Mitsubishi Chemical Corporation), O
PS film (manufactured by Asahi Kasei Corporation) or the like can be used.

As the pressure-sensitive adhesive dissolved in d-limonene used in the present invention, the following rubber-based pressure-sensitive adhesives and acrylic pressure-sensitive adhesives can be suitably used.

The base rubber used as the rubber-based pressure-sensitive adhesive includes natural rubber, polyisoprene rubber, styrene
Isoprene / styrene block copolymer or hydrogenated product thereof, styrene / butadiene / styrene block copolymer or hydrogenated product thereof, recycled rubber, styrene / butadiene rubber, polyisobutylene rubber and isobutylene / isoprene copolymer rubber can be used. . The plasticity of these rubbers can be appropriately adjusted by mastication with a roll or addition of a mastication accelerator. The cohesive force of the rubber-based pressure-sensitive adhesive can be controlled by an ordinary crosslinking method such as thiuram vulcanization or resin vulcanization.

The pressure-sensitive adhesive may be a natural or synthetic resin, a tackifying resin, a plasticizer, a softener,
It can be produced by a usual method by blending an antioxidant and the like.

Examples of the tackifier include petroleum resins such as α-pinene and β-pinene polymers, terpene resins, aliphatic and aromatic petroleum resins, and aliphatic / aromatic copolymer petroleum resins, Other rosin-based resins and coumarone-indene-based resins can be used.

As a method of forming the pressure-sensitive adhesive layer on the base polystyrene film, an organic solvent-based pressure-sensitive adhesive, an aqueous dispersion or emulsion-based pressure-sensitive adhesive, or a hot-melt pressure-sensitive adhesive can be used. Can be formed by coating.

As a specific method for producing an adhesive tape,
It can be manufactured by a usual method as described below. A method in which a release agent layer is formed by applying a silicone release agent or the like on one surface of a polystyrene film as a base material in advance, and then applying an adhesive on the other surface, or a water-based emulsion adhesive. There is a method of applying and drying the agent.

When the organic solvent-based pressure-sensitive adhesive is directly applied to the polystyrene-based film as the substrate, it can be performed by selecting a solvent that does not damage the polystyrene-based film. Alternatively, the method can be carried out by a method in which an adhesive is applied to one side of a release paper, dried, and bonded to a polystyrene film as a base material.

[0018]

The present invention will be described below by way of specific examples.

Example 1 A polystyrene film having a thickness of 30 μm (manufactured by Okura Industries Co., Ltd.)
Silicone release agent (X-62)
-2416: Shin-Etsu Chemical Co., Ltd.) with a thickness of 1 μm,
Further, the pressure-sensitive adhesive shown in Table 1 was applied at a thickness of 30 μm to obtain a polystyrene film pressure-sensitive adhesive tape. 1 g of this tape was collected in a glass bottle, and 19 g of d-limonene solution was added to conduct a solubility test. The determination method of the solubility test was as follows: ：: Uniform dissolution was possible. Δ: Partially swelled and did not dissolve. ×: Swelled and did not dissolve (became a gel). Normal adhesive strength A test piece cut into a roll of 20 mm and a polystyrene bag are stuck at 23 ° C.
mm / min. One reciprocation is performed at the speed shown in FIG. After standing for 20 minutes, 300 mm / min. The force at which the adhesive surface is peeled by 180 degrees is measured at the following speed. Normal holding force The holding force is determined according to JIS Z0237. 25mm ×
When a load of 1 kg was applied to an area of 25 mm, it was judged as "O" when it did not drop after 30 minutes, and as "X" when it dropped after 30 minutes. A: SK-1720 (manufactured by Soken Chemical Co., Ltd .: acrylic solvent-based pressure sensitive adhesive) B: SBR (manufactured by Nippon Synthetic Rubber Co., Ltd .: 1013N) 100
Parts by weight, petroleum-based tackifying resin (manufactured by Zeon Corporation: M-1)
00) A solid content of 100 parts by weight dissolved in a hexane solvent 2
0% solvent type adhesive. C: IIR (Nippon Synthetic Rubber Co., Ltd .: Butyl 365) 10
0 parts by weight, petroleum-based tackifying resin (manufactured by Zeon Corporation: M-
100) A solvent-type pressure-sensitive adhesive having a solid content of 20% and 100 parts by weight dissolved in a hexane solvent. D: SIS (Shell Japan Co .; Clayton D-1)
107) 100% by weight of a petroleum tackifier resin (manufactured by Nippon Zeon Co., Ltd .: M-100) in a hexane solvent dissolved in hexane solvent and having a solid content of 20%. E: SBS (Shell Japan; Clayton D-1)
101) 100% by weight of a petroleum-based tackifying resin (manufactured by Nippon Zeon Co., Ltd .: M-100) in a hexane solvent and a 20% solids solvent-based pressure-sensitive adhesive. F: Natural rubber (Wallace plasticity W = 15) 100
Parts by weight, petroleum-based tackifying resin (manufactured by Zeon Corporation: M-1)
00) A solid content of 100 parts by weight dissolved in a hexane solvent 2
0% solvent type adhesive. G: solid content 20 obtained by dissolving PS463- (manufactured by ACI JAPAN: hot melt type adhesive) in a hexane solvent
% Solvent-based adhesive. H: Natural rubber (Wallace plasticity W = 30) 100
Parts by weight, petroleum-based tackifying resin (manufactured by Zeon Corporation: M-1)
00) A solid content of 100 parts by weight dissolved in a hexane solvent 2
0% solvent type adhesive. I: X-392-411E (manufactured by Seiden Chemical Co., Ltd .: natural rubber emulsion type adhesive) J: SBS latex (manufactured by Zeon Corporation: LX-21)
0) An emulsion-type pressure-sensitive adhesive comprising 100 parts by weight and 100 parts by weight of a lon-based tackifier resin (DS-70E, manufactured by Harima Chemicals, Inc.). K: 100 parts by weight of SK-1720 (manufactured by Soken Chemical Co., Ltd .: acrylic solvent-based pressure sensitive adhesive) isocyanate curing agent (L-
45) An acrylic solvent-based pressure-sensitive adhesive consisting of 1 part by weight. L: E-03H (manufactured by Soken Chemical Co., Ltd .: acrylic emulsion-type adhesive)

[0020]

[Table 1] BG are examples of the present invention, and HL and A are comparative examples.

[0021]

According to the present invention, since the pressure-sensitive adhesive tape is constituted so that both the base material and the pressure-sensitive adhesive are dissolved in d-limonene, the pressure-sensitive adhesive tape can be used as an end-stopping pressure-sensitive adhesive tape for a polystyrene-based bag for collecting waste polystyrene foam. It can be used for sealing fish boxes and trays and for terminating it, and can be subjected to a recycling process by the limonene dissolution method without peeling off the adhesive tape after use.

Claims (4)

[Claims] 1. A polystyrene film adhesive tape comprising a polystyrene film as a base material and an adhesive layer formed on at least one surface thereof, wherein the adhesive tape is dissolved in d-limonene. 2. The polystyrene film adhesive tape according to claim 1, wherein the adhesive layer is a rubber-based adhesive. 3. A polystyrene-based film substrate having a release agent layer formed on the other surface thereof.
The polystyrene film adhesive tape of the above. 4. The polystyrene film pressure-sensitive adhesive tape according to claim 1, wherein a release material is bonded to the surface of the pressure-sensitive adhesive layer.