JPS6017465B2 - Adhesive composition for surface protection materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive composition for surface protection materials for metal plates such as stainless steel plates, aluminum plates, and steel plates, decorative plates, glass plates, etc. (hereinafter referred to as protection plates).

As a surface protection material for the protection plate, a surface protection sheet is often used in which a paper or synthetic resin film is used as a support and a pressure-sensitive adhesive based on rubber is coated on the support.

However, the pressure-sensitive adhesive of these surface protection sheets has the disadvantage that the adhesive strength increases significantly over time, making it extremely difficult to remove the sheet from the protection plate, and in severe cases, the adhesive strength increases significantly over time. It was a common occurrence that adhesive remained on the surface of the protective plate. As a method to solve these drawbacks, adhesive compositions have been proposed and used in which a suitable amount of phosphate ester and/or its derivatives, surfactants such as amine surfactants are blended into the adhesive composition. If a surface protection sheet provided with such an adhesive composition is temporarily attached to the protection plate and left under high temperature and high humidity, the surface of the protection plate may be contaminated, and a solution to this problem is desired.

The present invention has been developed as a result of studies to improve these drawbacks and to develop a more suitable adhesive composition for surface protection materials. To provide a pressure-sensitive adhesive composition for a surface protection material, which exhibits little change in adhesive strength over time and maintains an adhesive strength to the extent that it can be easily peeled off.

That is, the present invention is a pressure-sensitive adhesive composition for a surface protection material, which is characterized in that it is formed by adding a factis to the pressure-sensitive adhesive composition.

This adhesive composition is applied to paper or a synthetic resin film to obtain a surface protection material, and even if it is temporarily attached to a protection plate and left for a relatively long period of time, the adhesive strength does not change over time. It has the unique effect of maintaining adhesive strength to the extent that it can be easily peeled off.

The adhesive composition used in the present invention may be either a synthetic resin type or a rubber type adhesive composition.

Therefore, adhesive compositions made of a main material that is difficult to cross-link, such as polyisobutylene rubber, or cross-linked with peroxide such as ethylene→vinyl acetate copolymer, or by light irradiation, can be used to adhere to the protective plate over time. This is particularly effective when using a pressure-sensitive adhesive composition that increases strength.

Factis (generally called sapu) is black sabu, which is made by heating and vulcanizing oxidized vegetable oil or fish oil with sulfur.
White or black sub, which is made by vulcanizing vegetable oil with sulfur chloride at room temperature, is used.

The amount of Factis added varies depending on the properties of the pressure-sensitive adhesive composition, particularly its creep properties, but it is generally used in the range of 0.1 to 50 parts by weight based on 10 parts by weight of the composition.

Examples of the present invention will be shown below.

The text middle part means the weight part. Example 1 Polyisobutylene rubber 100 with an average molecular weight of about 80,000
A mixture prepared by adding 15 parts of white saps to 100°C
The pressure-sensitive adhesive composition of the present invention is obtained by mixing for 10 minutes with a mixing roll held in a .

In order to evaluate the properties of this composition, toluene was added to it to prepare a solution of the composition with a solid content of 1% by weight, and this was applied to one side of a 60 mm thick polypropylene film so that the thickness after drying was It was applied to a thickness of 10 mm and dried at 8 pi for 3 minutes to obtain a surface protection material.

Example 2 An ethylene monovinyl acetate copolymer with a vinyl acetate content of 4% by weight was woven with 10 ribs.5. A mixture for an adhesive composition to which $Miyako Sub was added and a low density polyethylene resin were charged into respective hoppers of a two-layer extruder and coextruded to obtain a surface protection material.

The thickness of the adhesive composition layer was 15 m, and the thickness of the polyethylene resin layer was 45 m. Table 1 shows the test results for Examples 1-2.

Comparative Examples 1 and 2 in Table 1 correspond to Examples 1 and 2, respectively, and each does not use fruitis (sub). Table 1 Test method in Table 1: A sample (2 broadsides) was pasted on a BA-finished stainless steel plate and an acrylic-painted colored aluminum plate, and after storage at the initial stage and under the specified conditions, it was peeled off at 180 degrees and the adhesion strength (conditions , 2000×65
%R. Day. The results were measured at a tensile rate of 30%/min).

As is clear from the above examples, it is remarkable that the adhesive composition for surface protection materials to which Factis is added exhibits little increase in adhesive strength over time after application.

The reason why the adhesive strength does not increase over time is because the addition of Factis reduces the fluidity of the adhesive composition and suppresses the increase in the contact area between the adhesive composition layer and the protective plate due to aging. Seem.

Claims (1)

[Claims] 1. A pressure-sensitive adhesive composition for surface protection material, characterized in that Factis is added to the pressure-sensitive adhesive composition.