JPS5925859A - Slightly tacky sheet - Google Patents

Abstract

PURPOSE:To obtain titled sheet useful for removing dusts, etc. through sticking, by first coating on a specific substrate a weak tackifier comprising each specific amount of natural (or synthetic) rubber and tackifying resin followed by laminating a releasing film constituted by thermoplastic resin. CONSTITUTION:The objective sheet can be obtained by first coating on (A) a substrate constituted by thermoplastic resin (e.g., polypropylene) sheet, (B) a weak tackifier comprising (i) 60-90wt% of natural or a synthetic rubber (e.g., a styrene-butadiene-styrene block copolymer) and (ii) 10-40wt% of a tackifying resin (e.g., rosin or a derivative therefrom), followed by laminating on a thermoplastic resin film, a releasing film made by baking a silicone. EFFECT:Giving high weatherability, etc. USE:Applicable to mats for sickroom, computer-operating room and various laboratory entrances, and to brushes for clothes and shoes.

Description

Detailed Description of the Invention: This relates to a weakly viscous sheet useful for adhering and removing dust, dirt, dirt, etc. that does not adhere to the object and adheres to the surface of the object when the sheet is bonded to the object. It is.

Many adhesive sheets or tapes are known to date. In addition, as a sheet for selectively removing mud and dirt, a sheet coated with a coating material mainly composed of vinyl acetate polymer and ethylene-vinyl acetate copolymer (Japanese Patent Laid-Open No. 57
-5778) Ethylene-vinyl acetate copolymer, tackifier resin. A sheet coated with a coating material containing vinyl chloride resin as a main component (Japanese Unexamined Patent Publication No. 57-10669) is well known.

However, all of these known adhesives have a strong temperature dependence, become more sticky in the summer, have a sticky surface, and adhere to many objects such as dust and mud. In the winter, the stickiness decreases, and it has the disadvantage that dust, mud, etc. do not stick to it.

The inventors of the present invention have conducted extensive research in search of a weakly viscous sheet that is temperature-independent and can efficiently remove dust, dirt, dirt, and other substances adhering to the surface of objects.
(JIS Z 0237), holding force Omm (JI
The present invention was completed based on the knowledge that a sheet having the surface characteristics of S1 Z 0237) was required.

That is, the first object of the present invention is to provide a weakly viscous sheet formed by coating the surface of a support made of a thermoplastic resin sheet with 60 to 90% by weight of natural or synthetic rubber and 10 to 10% of a tackifier resin. There is a particular thing.

Furthermore, the second object of the present invention is to apply 55 to 90% by weight of natural or synthetic rubber on the surface of a support made of a thermoplastic resin sheet.
, an adhesive sheet formed by applying a weak viscosity agent containing 5 to 35% by weight of a tackifier resin and 5 to 20% by weight of a plasticizer, and covering the surface to which the weak viscosity agent is applied with a thermoplastic resin film with q-. Our goal is to provide the following.

In the present invention, the thermoplastic resin sheet constituting the support and the thermoplastic resin constituting the release film include polypropylene and polyethylene.

Polyethylene terephthalate, polyvinyl chloride.

Examples include polyvinylidene chloride and cellophane paper.

As the mold release film, a film made of these resins whose surface has been subjected to mold release treatment by a general method such as silicone baking is used.

The thickness of the support is generally 20-80μ, preferably 3
Those having a diameter of 0 to 50μ are used. The thickness of the release film generally used is 10 to 30 microns. Although thicker layers may be used, it is not economical.

Next, the weak viscosity agent used in the present invention contains natural or synthetic rubber and tackifier resin as essential components.

Here, the synthetic rubbers include styrene-butadiene styrene block copolymer, styrene isoprene styrene block copolymer, polyisoptylene, polybutene,
Styrene butadiene rubber.

Examples include styrene-butadiene random copolymer and styrene-isoprene random copolymer. Examples of the tackifier resin include rosin or rosin derivatives such as hydrogenated rosin, aliphatic petroleum resins, aromatic petroleum resins, or mixtures thereof, and natural or synthetic terpene resins. When using liquid rosin, liquid petroleum resin, etc. as the tackifier resin,
The object of the present invention can be fully achieved without adding the plasticizer described below. This is because these rosins or petroleum resins themselves also function as plasticizers.

The blending ratio of the natural or synthetic rubber and the tackifier resin is 60 to 90% by weight, preferably 65 to 80% by weight of the former.
and the latter is 10 to 40% by weight, preferably 20 to 3% by weight.
It is 5% by weight.

When adding a plasticizer to the above composition, naphthenic oil, phthalic acid ester, dioctyl adipate, dioctyl sebacate, castor oil, trimellitic acid ester, etc. are preferably used.

When using these plasticizers, the blending ratio of the king is 55 to 90% by weight of natural or synthetic rubber, preferably 65 to 80% by weight.
% by weight, tackifier resin 5-35% by weight, preferably 10-30% by weight, plasticizer 5-20% by weight, preferably 5-15% by weight.

Mixing of the components of these weak viscosity agents is carried out under humidification using a conventional heated mixing pot, kneader, or the like.

During this mixing, BI(T, 4.4'-thiobis6-t
- Adding 0.1 to 1-0 parts by weight of an anti-aging agent such as butylphenol to 100 parts by weight of the thinning agent composition is one of the preferred formulations to prevent changes over time such as aging. be.

The weak tack agent described above is applied onto the surface of the support, and a release film is coated on the surface coated with the weak tack agent to obtain the weak tack sheet of the present invention. This coating is performed by conventionally known extrusion coating processing (laminate processing), press processing, calender processing, etc.

According to the present invention, pole tack (angle 60°) A1-10 (JIS Z
0237), holding force Om (JIS Z 0237)
A weakly viscous sheet having the following characteristics is obtained. Therefore, there is almost no temperature dependence, and dust, mud, dirt, etc. can be easily removed from objects to which they adhere, regardless of the location, whether in summer or winter.

Even when the slightly viscous sheet of the present invention was subjected to a 48-hour weather test at 65°C and 80° relative humidity, almost no change was observed in its physical properties, indicating that it has excellent weather resistance. be.

Since the weakly viscous sheet according to the present invention has the function of adhering and removing only the above-mentioned dust, mud, dirt, etc., it can be conveniently used as a cloak for entrances to hospital rooms, computer room entrances, and entrances to various test laboratories. It is also used as a substitute for clothes brushes, shoe polishing brushes, etc.

The present invention will be explained in more detail below with reference to Examples. The present invention is not limited to these Examples. In addition, in the examples, parts indicate parts by weight.

Example 1 Styrene isoprene styrene block copolymer (manufactured by Shell Chemical ■, trade name "Krayton 1107J") 695
1 part, 200 parts of polybutene (manufactured by Toyo Soda Kogyo ■, trade name [HIVIS 7000/45J), and 200 parts of BHTS were placed in a kneader with a heating jacket, and mixed and heated at 150° C. for 30 minutes. Next, 100 parts of hydrogenated rosin (manufactured by Herkiles, trade name: Stepelai J) was added to the mixture, and the mixture was melted and heated at 150° C. for 15 minutes.

The resulting mixture was immediately applied to a 30μ thick polyester film (coating thickness 100μ). Next, this coated surface was covered with a polyolefin release film (thickness: 50 μm). The physical property values of this coated surface are first displayed.

Example 2 Sterene-butadiene-styrene-pronoc copolymer (manufactured by Asahi Kasei ■, trade name "Toughblen A") 825 parts 9 petroleum resin (Arayo Kagaku ■, trade name "Alcon M-100J") 90
The mixture was placed in a kneader with a heating jacket, and mixed and heated at 150°C for 30 minutes. Next, 80 parts of naphthenic oil (manufactured by Shell Chemical Company, trade name: Shell Flex 371J) was further added, and the mixture was melted and mixed at 150° C. for 15 minutes.

The resulting mixture was immediately applied to a 30μ thick polyester film (coating thickness 50μ). Next, this coated surface was covered with a cellophane release film (thickness: 30 μm). The physical properties of this coated surface are shown in Table 1.

Examples 6 to 10 A weak viscosity agent having the composition ratio shown in Table 1 was prepared according to Example 1, a weak viscosity sheet was created, and the physical properties of the coated surface were measured in the same manner as in Example 1. The results shown are obtained.

Claims (1)

[Claims] U) 60 to 90% by weight of natural or synthetic rubber and 1 tackifier resin on the surface of a support made of a thermoplastic resin sheet.
A weakly viscous sheet formed by applying a weakly viscous agent containing 0 to 40% by weight and covering the surface coated with the weakly viscous agent with a release film made of a thermoplastic resin film. (Odor) Thermoplastic resins include polypropylene, polyethylene,
Claim No. 1 which is polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride or cellophane paper (
The weakly viscous sheet described in item 1). (3) Synthetic rubbers include styrene-butadiene styrene block copolymer, styrene-isoprene styrene block copolymer, polyimbutylene, polyphthene, and styrene-butadiene rubber. The weakly viscous sheet according to claim 1 or 2, which is a styrene-butadiene random copolymer or a hastyrene isoprene random copolymer. (4) the tackifier resin is rosin or its derivative;
Claim 1 (1) which is petroleum resin or terpene resin
) to (3). (5) Claim 1 (1) using a release film treated with silicone baking on a thermoplastic resin film
) to (4). (6) On the surface of a support made of a thermoplastic resin sheet, 55 to 90% by weight of natural or synthetic rubber and 5 to 5% of tackifier resin are added.
A weakly viscous sheet formed by coating a weakly viscous agent containing 35% by weight and 5 to 20% by weight of a plasticizer, and covering the surface coated with the weakly viscous agent with a release film obtained by subjecting a thermoplastic resin film to a release treatment. (7) Plasticizer is naphthenic oil, phthalate ester,
The weakly viscous sheet according to claim (6), which is dioctyl adipate, dioctyl sebacate, castor oil, or trimellitic acid ester.