JPS61104971A - Cover material for glass vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a lidding material used for sealing the mouth of a glass container by heat sealing.

(Description and Problems of the Prior Art) Conventionally, liquid Tohin products (e.g., soft drinks, alcoholic beverages, etc.), pasty foods (e.g., jam, ketchup, mayonnaise, etc.), or powdered foods (e.g., seasonings, etc.) have been stored in glass containers. A method is known in which the sealing film is sealed by heat-sealing with a thermoplastic resin film, but there is a problem in that the adhesive strength of this sealing film decreases over time. This decrease in adhesive strength is particularly noticeable at high temperatures and high humidity, and this is thought to be due to the hydrophilic nature of the glass surface.

For this reason, it has been proposed to apply a pulling agent to the mouth of the glass container in advance, but this is not necessarily preferable since it causes problems in terms of manufacturing control and hygiene.

(Purpose of the invention) This invention was made in view of the above circumstances, and it is possible to obtain sufficient adhesive strength, reduce strength loss even under high temperature and high humidity, and cause fewer problems in terms of manufacturing control and hygiene. The purpose is to provide a means for sealing glass containers.

(Means for solving the above four points) That is, the present invention comprises a lid base material and an ionomer composition layer containing a silane coupling agent applied to the adhesive surface side of the base material via an ionomer layer. The present invention provides a lid material for a glass container characterized by the following.

4. Detailed Description of the Invention In this invention, the ionomer (resin type) that is first coated on the lid base material and the ionomer mixed with a silane coupling agent (desversion type) that is further coated thereon are methacrylic A metal crosslinked product of acid-modified polyolefin, particularly one containing 5 to 20% by weight of methacrylic acid, is preferred.

The blending ratio of aminosilane and vinylsilane used as a silane coupling agent in this invention is 5 to 5.
Preferably, it contains 95% by weight, especially 25 to 75 liver fats. Further, a preferred specific example of aminosilane is aminoethylaminomethylphenethyltrimethoxysilane, and a preferred specific example of vinylsilane is vinyltriethoxy7rane or vinyltrimethoxysilane.

The amount of this silane coupling agent added to the Disno and One John type ionomer is 0.5 to 20% by weight.
A suitable amount is preferably 3 to 10% by weight.

The coating amount of the 1-fat type ionomer applied to the lid base material is 20 to 100 μm thick, preferably 40 to 60 μm thick.
Approximately lIm is appropriate.

In addition, the coating amount of the ionomer of Dis Darts and Ntaide with added silane coupling agent is 0.1~
A suitable area is 597 m2, preferably about 0.1 to 11 m2.

Further, as the lid base material, metal foil, glass film, nonwoven fabric, or a laminated film of these may be used.

Heat sealing of the lid material of this invention to the mouth of a glass container is usually carried out at a temperature of 200 to 250°C and a pressure of 1 to 5 kg 7 cm.
”, and the time is 1 to 5 seconds.

Example 1 Methacrylic acid modification I on aluminum foil with a thickness of 50 μm
Liethylene-Zn (zinc) ion cross-linked product (Himilan 1702, trademark "', Mitsui De/N Polychemical (
50 μm of methacrylic acid content 10% by weight
A thickly coated cover material was prepared.

Next, dispersion type ionomer (Chemi A
? -Le 8100. Trademark, Mitsui Petroleum & Chemicals Co., Ltd.) #) (methacrylic acid content: 10%) and aminoethylmethylphenethyltrimethoxysilane (methacrylic acid content: 10%) as a silane coupling agent.
X12-5202° (trade name, Shin-Etsu Chemical) and vinyltriethoxysilane (KBE 1003, trade name,
A 1:1 mixture (manufactured by Shin-Etsu Chemical Co., Ltd.) was mixed at a ratio of 5% by weight, and this mixture was coated on the ionomer coated surface of the lid material paste under conditions such that the coating amount was 1.011/m'' solid content. did.

Next, Nuda Glass (S 1214, product name).

Matsunami Glass Industry Co., Ltd. #) was heat-sealed under the same heat-sealing conditions, i.e., temperature 250°C and pressure. 3yu x 12
The adhesive strength was measured immediately after heat sealing for 3 seconds.

Furthermore, these heat-sealed products were immersed in water at 40° C. for one week and one month, and then their adhesive strength was measured.

The measurement results are shown in Table IK below.

Table 1 Note that the decrease in strength of the suitable material of the present invention after being submerged at 40° C. for one month is considered to be due to the water absorption of the resin rather than the decrease in strength of the adhesive surface.

Example 2 The same resin type ionomer as in Example 1 (
A lid material paste coated with Himilan 1702) to a thickness of 40 μm was prepared (this will be referred to as lid material A).

Next, for comparison, a roofing material was prepared by coating the ionomer layer of this lidding material paste with an ethanol solution (5% molten e) of the same silane coupling agent as in Example 1 and drying it.
This is called suitable material B.

Further, in accordance with the present invention, ionomer (Kemi/'P-L 5100) of Ventide was added to the ionomer layer of the above-mentioned lidding material paste in a solid content to which 3 bits of the same silane coupling agent as in Example 1 was added. 0.3.9/m" and dried (this is called layer material C)
.

Then, in the same manner as in Example 1, heat sealing was performed on the surface to be adhered made of soda glass under the same conditions as in Example 1.

The results of measuring the peel strength of these heat-sealed products are shown in Table 2 below.

Table 2 Example 3 Same conditions as Example 1 except that the blending ratio of aminoethylaminomethylphenethyltrimethoxysilane and vinyltriethoxysilane in the silane coupling agent was changed as shown in Table 3 below. The lid material was manufactured below and then heat sealed. The resulting seal strengths are shown in Table 3 below.

Table 3 From the measurement results, it was confirmed that the blending ratio of aminosilane and vinylsilane is preferably 5 to 95% by weight, particularly 25 to 75% by weight.

(Function, Effect) According to the lid material for a glass container according to the present invention, various liquid foods, paste foods, powder foods, local chemicals, industrial chemicals, etc. can be sealed in a glass container, and the glass container can be kept in a sealed state. It is possible to store it for a long time. In addition, when hot filling foods (at a temperature of 60 to 95 degrees Celsius), steam may be generated from the contents, contaminating the adhesive surface to some extent, and forming a water coating. It can maintain good heat sealability and strength.

Claims (2)

[Claims] (1) A lid material for a glass container comprising a lid material base material and an ionomer composition layer containing a silane coupling agent applied to the adhesive surface side of the base material via an ionomer layer. . (2) The lid material for a glass container according to claim 1, wherein the silane coupling agent is a mixture of amine silane and vinyl silane.