JPS588757Y2 - adhesive sheet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an adhesive sheet for adhesion to glass, and more particularly to an adhesive sheet for glass that has particularly strong adhesive strength even when wet and can be peeled off when no longer needed.

Recently, there have been many reports of damage caused by broken or scattered window glass during disasters such as earthquakes, typhoons, fires, explosions, etc., and there is a strong desire to prevent such damage.

Existing adhesive sheets for glass shatter prevention have a drawback in moisture resistance, and when the humidity is high, moisture that has passed through the film layer enters the interface between the glass and the adhesive, significantly reducing the adhesive strength and reducing the shatter prevention effect. The defect was so serious that it completely lacked.

The inventor of the present invention originally considered that the adhesive strength of adhesive sheets for glass shatter prevention should be maximized in the rain, especially during typhoons, and that the moisture-resistant adhesive strength is extremely high. As a result of intensive research into creating a pressure-sensitive adhesive sheet that can control the adhesive strength to the extent that it can be peeled off when not needed, we were able to achieve this goal.

The adhesive sheet according to the present invention also has a suitable application as an adhesive sheet for labels of ampoules that are sterilized with hot steam or boiling water, and can be used for that purpose.

The adhesive sheet of the present invention is obtained by coating a thin layer of a mixture of a 7 run coupling agent and an adhesive on one side of a sheet substrate, and the amount of the silane coupling agent is determined based on the solid weight of the adhesive. It is limited within the range of 0.0003 to 10%.

Coupling agents below this lower limit have low adhesive strength when wet (no shatterproofing effect; exceeding the upper limit not only reduces adhesive strength but also reduces the cohesive force of the adhesive, making it difficult to use for bonding glass windows) In this case, the anti-scattering effect is lost, and on the other hand, when used for glass ampoules, a repellency phenomenon occurs and the adhesion function is no longer achieved.

The adhesive sheet according to the present invention is provided by coating a sheet substrate with a thin layer of an adhesive mixture containing a silane coupling agent within the above range,
It can be used as it is, rolled into a roll, or protected by attaching release paper to the coated surface.

The sheet base material used in the adhesive sheet of this invention may be a plastic film, paper, or a sheet made from a composite material made by coating or bonding plastics onto paper (plastic films include polyester film, polycarbonate film, polyvinyl chloride film, etc.). film, nylon film.

Films with excellent breaking strength and weather resistance, such as acrylic film and polystyrene film, can be used.

Furthermore, especially for glass ampoules, high-quality paper, coated paper, composite materials, etc. may be used in addition to the above-mentioned film.

The silane coupling agent used in this project has the following general formula:
R-8i3(R')3 (wherein R is a vinyl group, a methacryloxy group, an epoxy group, or an amino group.

(represents a mercapto group, R' represents a methoxy group, an ethoxy group, a β-methoxyethoxy group, a halogen group), specifically vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) Silane, γ-crisitoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N-β(aminoethyl)γ-aminopropylmethyldimethoxysilane, γ-mercaptofuroyltrimethoxysilane, γ-aminopropyltrimethoxysilane One or a mixture of two or more selected from the group consisting of ethoxysilanes is used.

In addition, the adhesive used in this invention is natural rubber, synthetic com,
A resin selected from acrylic resin, polyester resin, vinyl ether resin, acetal resin, and vinyl alcohol resin is used as a base, and the silane coupling agent is added to the base using a suitable solvent such as ethyl acetate. 0.0003 to 10% by weight and 30% by weight
~40%, and the solution is applied in a thin layer onto a release paper to a dry thickness of approximately 20-30μ.

One of the sheet base materials is bonded to this release paper, and the adhesive is transferred to the base material to obtain a pressure-sensitive adhesive sheet.

An embodiment of the adhesive sheet according to the present invention will be explained with reference to the cross-sectional view in FIG. 1 shows a layer of a glass adhesive containing an amount of a silane coupling agent.

FIG. 2 is a side view of a medicinal ampoule using the adhesive sheet according to the present invention as a label.

In this figure, 5 is an ampoule and 6 is an adhesive tape of the present invention used as a label.

Next, an example of manufacturing an adhesive sheet according to the present invention, and this
Figure 2 shows the results of a destructive test as an adhesive sheet for preventing scattering.

Example 1 1) Production of adhesive sheet 60 parts of butyl acrylate, 10 parts of ethyl acrylate, 20 parts of 2-ethylhexyl acrylate, 8 parts of vinyl acetate,
KBM-403 was added as a silane coupling agent to a 36-polyethyl acetate solution of a copolymer consisting of 2 parts of acrylic acid.
(manufactured by Shin-Etsu Chemical) separately. 0.0001. 0
．． 001.0.005,0.01゜0.06. 1.0
．． 2.0. 3.0. 4.0 and 5.0 parts by weight were added, thoroughly mixed, and the obtained adhesive was coated on a release paper so that the thickness after drying was about 20 μm.

These were each transferred to a polyester film with a thickness of 50 μm to prepare a destructive test sample.

2) Destructive test method The sample was attached to a square plate glass with a thickness of 3 mm and a size of 300 mm x 300 mm.

After being left at room temperature for 3 days, it was exposed to an atmosphere of 20°C and looφR,H for 24 hours, and immediately the test glass plate with the sample pasted thereon was fixed horizontally with the sample side facing up.

A hard baseball snap ball (diameter 73 mm, weight 535 mm) was fixed at a height of 1.6 m directly above the sample-attached glass.
g) was dropped to break the glass plate, and the peel strength of the unbroken portions was measured by a peel test, and the degree of scattering of the broken portions was observed.

3) Test Results Table 1 below shows the results of the peel test and destructive test by coupling agent content.

The test conditions were measured according to JISZ-1529.

From the above Q results, when the adhesive sheet containing the silane coupling agent is used for scattering prevention according to the present invention,
It has been found that it maintains its adhesive strength even in high humidity conditions, and damage caused by glass breakage can be kept to a minimum.

Further, from the above results, it was found that the adhesive containing a silane coupling agent with an adhesive solid content ratio of 10 wt.w. windward was undesirable as an adhesive because it resulted in a decrease in adhesive strength and a decrease in cohesive force.

The adhesive sheet according to the present invention can be attached to the surface of a plate glass to improve its adhesion when wet and enhance the shatterproof effect.In addition, when steam sterilizing glass ampoules in the pharmaceutical industry, it can be peeled off under high temperature and high humidity conditions. It can be safely used as a label for ampoules without causing floating.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the adhesive sheet according to the present invention, where 1 is the adhesive sheet according to the present invention, 2 is a sheet base material, and 3 is a sectional view showing an embodiment of the adhesive sheet according to the present invention.
4 indicates a release paper, and 4 indicates a layer of an adhesive for attaching glass containing the amount of silane coupling agent specified according to the present invention. FIG. 2 is a side view of a medicinal ampoule using the adhesive sheet according to the present invention as a label.

Claims (1)

[Claims for Utility Model Registration] 1) A thin layer of a mixture of a silane coupling agent and an adhesive is coated on one side of a sheet base material selected from plastic film, paper, or composite materials thereof, The silane coupling agent is <0.00 based on the solid weight of the adhesive.
A moisture-resistant pressure-sensitive adhesive sheet for glass, characterized in that the moisture content is within the range of 0.03 to 10%. 2) Select from the above plastic film, polycarbonate film, polyvinyl chloride film, nylon film, acrylic film, polystyrene film, and the above paper is high quality paper,
The adhesive sheet according to claim 1 of the utility model registration claim, which is selected from coated paper. 3) The silane coupling agent is vinylsilane. Contains methacryloxylan, epoxysilane, aminosilane, mercaptosilane, specifically vinyltrichlorosilane, vinyltrinidoxinlan, vinyltris(β)
-methoxyethoxy)silane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N-β(aminoethyl)r-aminopropylmethyldimethoxysilane, r-mercaptoflupyltrimethoxysilane, The adhesive sheet according to claim 1, wherein one or a mixture of two or more selected from the group consisting of γ-aminopropyltriethoxysilane is used. 4) The adhesive is natural rubber, synthetic rubber, acrylic resin,
Polyester resin, vinyl ether resin. The adhesive sheet according to claim 1, which is manufactured using a resin selected from the group consisting of acetal resin and vinyl alcohol resin as a main raw material.