JPH09143443A - Tacky agent and tacky catching tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tacky agent for a tacky catching tool having excellent a peeling property of a peeling paper and capable of strongly catching harmful organisms having strong legs such as a cockroach even after exposing the tacky face for a long time. SOLUTION: This tacky agent for a tacky catching tool is composed mainly of an elastomer, a tackiness imparting agent and a softener. The tacky agent has excellent peeling property and durability of catching property. It is composed of 100 pts.wt. of rubber component comprising natural rubber and/or synthetic rubber and styrene rubber in a blend ratio of (8/2)-(4/6) as an elastomer, 10-30 pts.wt. of A-B-A type styrene-diene-based block copolymer having 100,000-500,000 weight-average molecular weight, 10-30mol% styrene content and <=80% coupling percentage and 30-70 pts.wt. of a softener containing at least 10 pts.wt. of liquid polyisoprene having 20,000-50,000 weight-average molecular weight as essential components.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pressure-sensitive adhesive for sticking and capturing harmful insects such as cockroaches, flies, mites, and rats or small pests (hereinafter abbreviated as pests) and a suitable support. The present invention relates to a tacky capture tool manufactured.

[0002]

2. Description of the Related Art An adhesive trapping device for pests, in which a pressure-sensitive adhesive layer is provided on a support surface having an appropriate shape such as a film, a sheet, or a body, and the adhesive surface is covered with a release paper and protected, is known. , Various things are known.

An important technical issue of this type of sticky trap is the performance of the sticky agent, and what has hitherto been a necessary condition is:
There is no glue sticking out, and the release paper that protects the adhesive surface
It was that it could be easily peeled off and that it had a strong adhesive capture property. In order to satisfy such a need, inventions have been presented that specify the composition and physical properties of an adhesive.

For example, in Japanese Unexamined Patent Publication (Kokai) No. 52-154781 (Japanese Patent Publication No. 55-38100), a mixture of a thermoplastic elastic material, a tackifying resin and a softening agent in a specific range, and viscosity and holding time are used. Adhesives in a specific range are presented, and as the thermoplastic elastic body, natural rubber, isoprene rubber, styrene-butadiene rubber, other synthetic rubbers, styrene-diene block copolymers, and other thermoplastic elastomers are used. It is described that one or more kinds are used, and as the softener, process oil, hydrocarbon oil such as paraffin, animal and vegetable oil, polybutene, and liquid butyl rubber are used. Further, JP-A-54-86623 (Japanese Patent Publication No. 61-54)
764), as an elastomer component,
Block copolymer rubber alone or in a mixture with other rubber containing at least 25% by weight thereof, and a softening point of 60
A tackifier having a tackifying resin at a temperature of not higher than 0 ° C. as an essential component and having a viscosity and a holding time in a specific range is proposed.

[0005]

As exemplified above, in the prior art, it was possible to satisfy the tentative requirements for an adhesive agent for an adhesive trap, but in order to further increase the commercial value. However, this was not enough, and it was necessary to deepen the research. That is, an adhesive having necessary and sufficient performance must have excellent long-term maintainability (preservability) of the adhesive capturing performance in addition to the characteristics that have been conventionally pursued. The inventors of the present invention, for the purpose of this, as a result of earnestly researching the blending and physical properties of the elastomer, as a result, there is no sticking out of the adhesive, easy peeling, good adhesive capture property, and moreover, good adhesiveness thereof. The present invention has been completed by discovering a composition and physical properties for maintaining the capturing performance for a long time.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a pressure-sensitive adhesive for a pressure-sensitive adhesive trap, which comprises an elastomer, a tackifier and a softening agent as main components, and uses natural rubber and / or
Alternatively, the blend ratio of synthetic natural rubber and styrene rubber is 8:
100 parts by weight of a rubber component having a weight ratio of 2 to 4: 6 (hereinafter, weight parts will be simply referred to as "parts") and a weight average molecular weight of 100,000 to 5
ABA type styrene-diene block copolymer having a styrene content of 100,000, a styrene content of 10 to 30 mol% and a coupling rate of 80% or less, and a weight average molecular weight of 20,000 to 50, Adhesive of 30 to 70 parts of a softening agent containing at least 10 parts of liquid polyisoprene of at least 10 parts and having excellent releasability and storability of capture performance, and coating this adhesive on part or all of the support. Then, an adhesive capture tool prepared by adhering a release paper to the adhesive surface is presented.

The term "holding time" as used in the present invention means that a sample piece having a pressure-sensitive adhesive layer formed on the surface of a support is formed into a strip piece having a width of 10 mm, and the area of attachment is 1 at an end portion of a bakelite plate.
Affix it to 0 × 20 mm with finger pressure, and then leave it for 20 minutes (20 ° C., 65 ± 10% RH), and then with the sample body vertical, load 100 g on the end of the sample piece (measurement condition: 20 C., 65 ± 10% RH), and the time value until the sample piece comes off the Bakelite plate is designated.

The probe tack referred to in the present invention is 3 g when a load is attached to a stainless wire having a diameter of 0.5 mm.
The jig was attached to the Tensilon tester, the tip of the wire was brought into contact with the adhesive surface of the tack sheet for 10 seconds, and then the tack sheet
It is peeled off at a speed of 00 mm / min, and the maximum load at that time is designated.

The natural rubber (NR) and the synthetic natural rubber (IR) used in the present invention are masticated by using a deflocculating agent for raw rubber, and have a Mooney viscosity of 10-40 ML1 + 4 (100).
What was prepared at (° C) is used. The styrene-butadiene rubber (SBR) has a bound styrene content of 5 to 40 mol% and a Mooney viscosity of 20 to 100 ML1 + 4 (100).
(° C) is used. NR and / or IR and SBR
The mixing ratio is 8: 2 to 4: 6. If the ratio is out of this range, the sticking performance will be deteriorated.

Further, one of the essential conditions for the pressure-sensitive adhesive of the present invention is to blend a specific amount of a specific ABA type styrene-diene block copolymer in order to prevent the adhesive from sticking out.

As the block copolymer, the polymer block A is a styrene polymer, the polymer block B is butadiene, isoprene, or a polymer obtained by hydrogenating these.
Those having a weight average molecular weight of 100,000 to 500,000 and a styrene content of 10 to 30 mol% can be used. If the weight average molecular weight is less than 100,000, the releasability of the release paper will be poor and the effect of preventing squeeze out will be small, such being undesirable. When the weight average molecular weight is more than 500,000, the effect of preventing the adhesive from sticking out is good, but the adhesive trapping property is deteriorated, which is not preferable. When the styrene content is less than 10 mol%, the releasability of the release paper deteriorates and the effect of preventing squeeze out is small, which is not preferable. If the styrene content exceeds 50 mol%, the effect of preventing the adhesive from sticking out is good,
It is not preferable because the adhesiveness is poorly captured.

Further, a coupling rate of 80% or less is preferable, and a coupling rate of more than 80% is not preferable because the adhesiveness-capture property is deteriorated. Examples of such block copolymer rubber include Clayton from Ciel Chemical Co.,
Under the product name of Califlex or Asahi Kasei Corporation
Those commercially available under the trade name Toughprene from the same company are suitable. The latter radial teleblock copolymer has a polybutadiene block / polystyrene block ratio of 80/2.
An average molecular weight of 0 to 60/40 is 300 × 10 ³ to 15
It is 0 × 10 ³ , and as such a radial teleblock copolymer rubber, one commercially available from Asahi Kasei Kogyo Co., Ltd. under the trade name of Sorprene is suitable.

The amount of the block copolymer compounded is preferably 10 to 30 parts per 100 parts of the rubber component. 1
If the content is less than 0 parts, the release properties of the release paper will deteriorate and
Glue will squeeze out and workability will deteriorate. If it exceeds 30 parts, the adhesiveness is poorly captured, which is not preferable.

As the tackifier, polyterpene resins, rosin resins, aliphatic hydrocarbon resins and petroleum resins are preferably used. The compounding number is 50 for 100 parts of rubber component.
˜150 parts, and more preferably 70˜120 parts.

The softening agent has a weight average molecular weight of 20,
It is one of the essential conditions of the present invention to blend 000 to 50,000 liquid polyisoprene in an amount of 10 parts or more per 100 parts of the rubber component. If the weight-average molecular weight of the liquid isoprene rubber is less than 20,000, the release property of the release paper will be poor and the paste will easily stick out, which is not preferable. If the weight-average molecular weight of the liquid isoprene rubber exceeds 50,000, the effect as a softening agent becomes small, and the adhesive trapping property is lowered, which is not preferable.

When the amount of liquid isoprene rubber is less than 10 parts, it is not preferable because the adhesiveness of the adhesive surface is lowered when the adhesive surface is exposed for a long time. As other softening agents, polybutene, liquid paraffin, mineral oil and the like can be used in combination. The total number of softeners is 100 for the rubber component.
30 to 70 parts is preferable with respect to parts. If it exceeds 70 parts, the pressure-sensitive adhesive becomes too soft, the release property of the release paper is deteriorated, and the adhesive is extruded to deteriorate the processability.

In addition to the above, the pressure-sensitive adhesive of the present invention may optionally contain vegetable oil such as rapeseed oil, soybean oil and peanut oil, whale oil,
Animal oil such as cod oil, animal powder such as fish and meat, vegetable powder such as grains and vegetables, processed food such as cheese and butter,
Molasses, sugars such as sugar, and attractants such as pheromones are added in small amounts as attractants and / or prey agents for pests, and other fragrances, softeners, antioxidants, antioxidants, UV absorbers, etc. Known compounding agents are added.

As the base material coated with the above-mentioned pressure-sensitive adhesive, a suitable material, shape and structure such as cardboard, water resistant board, thick high-quality paper or plastic sheet, plastic film, non-woven fabric, etc. can be used according to the purpose. Can be used. The thickness of the adhesive coated on the substrate is 100 to 4
00 μm, more preferably 150 to 300 μm is suitable. Below this, the ability to capture pests is unfavorable,
If it is more than this, it is not preferable in terms of economy and processability.

The pressure-sensitive adhesive is formed on the substrate by means of calendering, extrusion or melt coating. The pressure-sensitive adhesive is formed on the base material (mounting paper, inner surface of the container) in a striped, corrugated or spotted shape, which covers a part of the base material surface, or in a state of covering the entire surface. As release paper, paper or plastic film that has been subjected to a release treatment on one or both sides can be used.However, it is possible to use a paper base material laminated with polyethylene and coated with a silicone release agent. it can.

A pressure-sensitive adhesive sheet for trapping harmful organisms, which is obtained by applying a pressure-sensitive adhesive to a suitable substrate, has a holding time of 5 to 100.
Min, probe tack 10 g or more is preferable. If the holding time is less than 5 minutes, the peelability of the release paper is poor and the processability due to squeeze out of the paste is poor, which is not preferable. Further, if the holding time exceeds 100 minutes or the probe tack is less than 10 g, the ability to capture pests is deteriorated, which is not preferable. Therefore, it is necessary to adjust the compounding and kneading conditions so that the pressure-sensitive adhesive satisfies these physical property values.
These adjustments can be made by conventional means.

[0021]

EXAMPLES Next, the contents of the present invention will be described in more detail by posting Examples and Comparative Examples, but the technical scope of the present invention is not limited thereto. Examples 1 to 4 A pressure-sensitive adhesive having the composition shown in Table 1 was prepared using a kneader, and this was coated on a cardboard (350 g / m ² ) to a thickness of 250 μm by an extruder and laminated with release paper for evaluation. A sample was prepared for. No squeeze-out of glue was found in any of the samples. The release paper had good release properties.

Comparative Examples 1 to 8 Test adhesives were prepared in the same manner as in Examples 1 to 4 with the formulations shown in Table 1 to prepare samples for evaluation. Example 1
4 to 4 and Comparative Examples 1 to 8 are summarized in Table 1 and the properties of the pressure-sensitive adhesive and the performance as a pressure-sensitive adhesive trap are shown.

[0023]

[Table 1] Note: NR: Mooney viscosity ML1 + 4 (100 ° C) adjusted to 25 SBR: Bonded styrene content 24 mol%, Mooney viscosity M
Adjusted to L1 + 4 (100 ° C) 55 (manufactured by Japan Synthetic Rubber Co., Ltd.,
SBR-SL-552) SIS / A: Styrene content 16 mol%, coupling rate 45%, weight average molecular weight 300,000 (Nippon Synthetic Rubber Co., Ltd., J
SR-SIS-5500) SIS / B: Styrene content 15 mol%, coupling rate 83%, weight average molecular weight 210,000 (Ciel Chemical Co., Ltd., Kraton D1107) Petroleum resin: Softening point 100 ° C (Nippon Zeon Co., Ltd., Quinton A100) Liquid polyisoprene: weight average molecular weight 30,000 (Kuraray Co., Ltd., Kuraprene LIR-30) Polybutene: weight average molecular weight 1350 (Nippon Oil Co., Ltd.,
Polybutene HV-300)

[Cockroach capture] The evaluation sample was placed in the experimental compartment with the release paper peeled off in the center of the box, and 12 black cockroaches were released. The capture rate is calculated based on how many black cockroaches are caught in the sticky trap after a certain period of time. A: Capture rate 90 to 100% O to A: Capture rate 70 to 90% B: Capture rate 50 to 70% X: Capture rate 50% or less

[Peelability of Release Paper] The evaluation sample is left in an air oven at 35 ° C., the release paper is peeled off, and judgment is made based on the following judgment criteria. ○: easy to peel ○ to △: slightly easy to peel △: difficult to peel ×: not peelable at all

[Cockroach capturing ability after exposure to glue surface] After peeling off the release paper from the adhesive trap and leaving it in the room for one week, the cockroach capturing ability is evaluated, and the determination is made based on the following criteria. ○: No difference from before leaving ○ to △… Almost same as before leaving △: Slightly lower capture rate than before leaving ×… Clearly lower capture rate than before leaving

[Comprehensive Evaluation] ◎ Excellent ○ Excellent △ There are some problems in practical use × There are considerable problems in practical use. As is clear from the results in Table 1, the sticky traps using the pressure-sensitive adhesive of the present invention are suitable for pests. On the other hand, in addition to having excellent tackiness, the release property of the release paper was good, and even if the adhesive surface was exposed for a long time, the capture property of pests was not easily lowered.

[0028]

As described above, the sticking / capturing device using the pressure-sensitive adhesive of the present invention has a holding time of 5 to 100 minutes and a probe tack of 10 g or more, and has good releasability of the release paper and is also adhesive. Even if the surface is exposed for a long time, it can strongly capture pests with strong leg power such as cockroaches, so its practical performance is significantly improved compared to conventional products.

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Claims (2)

[Claims] 1. A pressure-sensitive adhesive for a pressure-sensitive adhesive trap, which comprises an elastomer, a tackifier and a softening agent as a main component, and as an elastomer, a blend ratio of natural rubber and / or synthetic natural rubber and styrene rubber is 8: 2 to 4: 6. Rubber component of 100
Weight part, weight average molecular weight 100,000-500,0
00, 10 to 30 mol% of styrene content, and 10 to 30 parts by weight of ABA type styrene-diene block copolymer having a coupling rate of 80% or less, and a weight average molecular weight of 2
A pressure-sensitive adhesive excellent in releasability and trapping performance preserving property, which comprises as an essential ingredient 30 to 70 parts by weight of a softening agent containing at least 10 parts by weight of liquid polyisoprene of 50,000 to 50,000. 2. A pressure-sensitive adhesive trap comprising the support according to claim 1, which is applied to a part or the whole of a support, and release paper is attached to the pressure-sensitive adhesive surface.