JPS63213589A - Tacky adhesive tape of sheet - Google Patents

Abstract

PURPOSE:To obtain a tacky adhesive tape or sheet capable of semipermanently eliminating disagreeable smell such as organic solvent smell and putrid small while maintaining the tacky adhesivity, by applying a tacky adhesive layer on one surface of a porous substrate containing a deodorizing compound and laminating the other surface with a lamination material. CONSTITUTION:The objective tacky adhesive tape or sheet can be produced by applying a tacky adhesive agent such as rubber and acrylic resin to one surface of a porous substrate containing a deodorizing compound (preferably an odor-neutralizing deodorant composed of a network polymer compound such as lignin) and laminating a polyalkylene lamination material such as PE, PP and an ethylene/vinyl acetate copolymer to the other surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive tape or sheet. More specifically, the present invention relates to an adhesive tape or sheet that has an excellent deodorizing effect semi-permanently against unpleasant odors such as organic solvents and other putrid odors without impairing adhesiveness.

[Prior art] Adhesive tapes or sheets made of a porous base material with an adhesive layer laminated on one side and a polyalkylene laminate material on the other side are already known, and are widely used for packaging, bonding, masking, etc. has been done.

Typically, the adhesive layer of such adhesive tapes or sheets includes:
Natural and/or synthetic rubber adhesives, acrylic adhesives, etc. are used. Most of the adhesive is dissolved in an organic solvent such as hebutane, and then applied to the support surface and dried to form an adhesive layer. Therefore, there is a problem that the organic solvent remains in the adhesive, and the unpleasant odor peculiar to the organic solvent remains in the adhesive tape or sheet. In addition, in the case of a hot-melt adhesive that does not use an organic solvent, since the adhesive layer is formed by heating and melting the adhesive, it has an unpleasant odor such as the smell of burnt organic compounds. When these tapes or sheets are used to seal cardboard boxes, etc., there is a problem that these unpleasant odors are transferred to the contents through the cardboard box. This becomes a serious problem especially when the contents are food-related.

In order to solve this problem, there are known adhesive tapes or sheets in which an aromatic agent that masks unpleasant odors, such as an aromatic agent, is sprayed onto an adhesive layer, or which is mixed in the adhesive layer.

However, in the case of such adhesive tapes or sheets, the adhesive function is impaired because fragrances, etc. are sprayed onto the adhesive or mixed into the adhesive, and it is necessary to use a large amount of fragrances, etc. There are problems such as increased manufacturing costs.

Furthermore, although unpleasant odors such as those of organic solvents are masked by fragrances, there are cases where the smell of aromatic agents is disliked.

Therefore, an object of the present invention is to provide an adhesive tape or sheet that has a semi-permanent deodorizing effect on unpleasant odors such as organic solvents without impairing the adhesive performance of the adhesive layer.

[Means for solving problems]

The present invention uses an adhesive tape or sheet in which an adhesive layer is laminated on one side of a porous substrate containing an odor-reducing compound and a polyalkylene laminate material is laminated on the other side.

The porous base material used in the present invention is not particularly limited as long as it is a porous base material that can be used in this field, and examples thereof include paper such as kraft paper and Japanese paper, cloth such as woven fabric and non-woven fabric, porous Examples include a single substance or a composite such as a plastic film.

One side of the base material has polyethylene, polypropylene,
It is necessary that a polyalkylene laminate material such as ethylene-vinyl acetate copolymer be laminated. In addition,
The laminate material may contain pigments, stabilizers, fillers, crosslinking agents, and the like.

Furthermore, if necessary, a mold release agent used in this field, such as a silicone compound, a long-chain alkyl group-containing compound, or a fluorine compound, may be laminated on the laminate material.

The odor-reducing compound used in carrying out the present invention is capable of reducing odor and is not particularly limited as long as it can achieve the object of the present invention, and volatile compounds are usually used. Particularly preferred are odor neutralizing deodorizers.
Odor-neutralizing deodorizers have the ability to weaken or eliminate odors by appropriately combining odor-producing groups such as carbonyl groups and carboxyl groups present in substances. be. For example, by combining a compound with a putrid odor such as ethyl mercaptan and a compound with a camphor odor such as cineole, the putrid odor disappears, and a compound with an almond odor such as benzaldehyde is combined with a compound with a camphor odor such as cyclohexadecanone. There are examples where the almond scent disappears by combining these. For example, linear polymeric compounds such as lignin collected from trees and plants [for example, Airchem 105 (
(manufactured by Daiichi Kogyo ■)] etc. are exemplified as odor neutralizing deodorizing agents.

The odor-reducing compound is contained in the porous substrate, and examples of the mode of its inclusion include, for example, a mode in which it is coated only on the surface, a mode in which it penetrates into the pores of the porous substrate, An example is an embodiment in which both of these embodiments are mixed.

Examples of methods for incorporating the odor-reducing compound into the porous substrate include the following methods.

Specifically, examples include a method in which the odor-reducing compound is dissolved in water and sprayed onto the substrate, and a method in which the odor-reducing compound is applied by a roll coater. In this case, the content in the porous base material is 0.1
g/rd or more and 2 g/- or less, preferably 0.2 g
/rd or more and 1.5g/rrr or less is suitable. If it is less than 0.1 g/n, the deodorizing effect will be low, and if it is more than 2 g/n, there is a concern that the odor of the odor-reducing compound itself will be emitted.

An adhesive layer is provided on the side surface of the porous base material on which the polyalkylene laminate material is not laminated.

The adhesive used in the adhesive layer is not particularly limited, and it is sufficient to use adhesives conventionally known in this field, such as natural and/or synthetic rubber adhesives, acrylic adhesives, etc. . In particular, in the present invention, it is preferable to use a hot-melt adhesive that does not require a drying process, and in this case, the odor-reducing compound in the base material is difficult to scatter, so that the effects of the present invention are more clearly exhibited. Ru.

[Action/Effect]

The effects of an adhesive tape or sheet in which a polyalkylene laminate material is laminated on one side and a porous base material containing an odor-reducing compound is used as a tape support are as follows. In other words, the odor-reducing compound is relatively volatile, so it easily scatters from the porous substrate. It will volatilize onto the adhesive layer. Although the adhesive layer is also formed into a film, it has more pinholes than laminate materials, so the odor-reducing compound evaporates little by little from these pinholes, so it will not last for a long time. Can remove unpleasant odors from adhesives, etc. Furthermore, since the odor-reducing compound is contained in the base material, the adhesive performance is not impaired.

Therefore, according to the present invention, without compromising adhesive performance,
An adhesive tape or sheet having an excellent deodorizing effect on unpleasant odors in adhesives is provided.

〔Example〕

The pressure-sensitive adhesive tape or sheet of the present invention will be specifically explained below with reference to Examples, and the fact that the pressure-sensitive adhesive tape or sheet of the present invention has less unpleasant odor of the pressure-sensitive adhesive will be clarified by the following Examples.

The present invention is not limited in any way by this example.

In addition, parts in the text mean parts by weight.

Example 1 A support is prepared by laminating low-density polyethylene to a thickness of LL- on one side of 173 g/rd kraft paper. On the laminate layer of this support, an addition-reactive silicone mold release agent of 0.7 g/n (solid weight) was applied (after coating, air was applied. Furthermore, a water-soluble odor neutralizing deodorizer (Airchem 105, Daiichi Kogyo Co., Ltd. Prepare a 10% aqueous solution of Qm) and apply the odor-neutralizing deodorizer to the opposite side of the support from the laminate layer using a roll coater to a weight of 0.3g1rd to completely impregnate the base material with water. Leave at room temperature until ready.

On the other hand, an adhesive was prepared by kneading 100 parts of styrene-isoprene-styrene block copolymer, 100 parts of petroleum-based tackifying resin, 15 parts of coumaron resin, 30 parts of liquid softener, and 1 part of anti-aging agent in a pressure kneader. do.

Next, 50% solids weight was applied to the non-laminated side of the support.
g/n? The adhesive is applied by melt extrusion to obtain an adhesive tape wound into a roll.

Comparative Example 1 An adhesive tape is obtained in the same manner as in Example 1, except that the base material is not impregnated with the odor-neutralizing deodorizer.

Comparative Example 2 Same as Example 1 except that after applying the adhesive, the odor neutralizing deodorizer was sprayed onto the adhesive layer so that the same amount of the same kind of odor neutralizing deodorizer as in Example 1 was contained per unit area of the adhesive tape. to obtain adhesive tape.

Experimental Example 1 The odor intensity and adhesive strength of the adhesive tapes obtained in Example 1 and Comparative Examples 1 and 2 were measured, and the results are shown in Table 1. The measurement method is as follows.

[Odor intensity]

A roll of adhesive tape was placed in a cardboard box and sealed, left for 3 months, then taken out, 10 people were asked to smell the odor, and measurements were made using Scheffe's paired comparison method.

〔Adhesive force〕

The measurement was performed according to the adhesive force measurement method specified in JIS-20237-1980.

Table 1 Example 2 A support is prepared by laminating low-density polyethylene to a thickness of 30P on one side of kraft paper having a basis weight of 73 g/rd.

Furthermore, a 30% aqueous solution of a water-soluble odor neutralizing deodorizer (Airchem 132 manufactured by Daiichi Kogyo ■) was prepared, and a roll coater was used.
An odor-neutralizing deodorizing agent is applied to the opposite side of the support from the laminate layer at a solid content of 1.5 g/d, and is left at room temperature until it is sufficiently impregnated into the substrate.

On the other hand, a toluene solution of an acrylic pressure-sensitive adhesive having a weight average molecular weight of about 1 million and having a monomer composition of 60 parts of butyl acrylate, 30 parts of 2-ethylhexyl acrylate, 10 parts of vinyl acetate, and 3 parts of acrylic acid obtained by a conventional method. Prepare.

Next, the adhesive is applied to the support and dried to a thickness of 30 Ps after drying, thereby obtaining an adhesive tape wound into a roll.

Comparative Example 3 An adhesive tape is obtained in the same manner as in Example 2, except that the base material is not impregnated with the odor-neutralizing deodorizer.

Comparative Example 4 A polyethylene laminate containing no odor-neutralizing deodorizer by blending an odor-neutralizing deodorizer into the adhesive solvent so that the same amount of the same type of odor-neutralizing deodorizer as in Example 2 was contained per unit area of the adhesive tape. An adhesive tape was obtained in the same manner as in Example 2, except that it was applied and dried on the non-laminated surface of kraft paper.

Experimental Example 2 The odor intensity and adhesive strength of the adhesive tapes obtained in Example 2 and Comparative Examples 3 and 4 were measured, and the results are shown in Table 2.
The measurement method was the same as in Experimental Example 1.

Table 2 [Effects] As is clear from the examples above, adhesives containing odor-reducing compounds and using a porous base material laminated with a polyalkylene laminate material on one side as the tape support. In the tape or sheet, there is no deterioration in the adhesive performance of the adhesive layer, and unpleasant odors such as those caused by solvents and the like are reduced.

Claims (1)

[Claims] An adhesive tape or sheet comprising a porous base material containing an odor-reducing compound, an adhesive layer laminated on one side, and a polyalkylene laminate material laminated on the other side.