JP7414475B2 - hot melt composition - Google Patents

Description

The present invention relates to a hot melt composition that has excellent ball tack properties and flow resistance at room and high temperatures, and can be easily applied to release paper, particularly for forming adhesive layers of small organism traps. The present invention relates to a hot melt composition useful for applications such as:

BACKGROUND ART In various factories, warehouses, various workshops, agriculture and livestock industries, general households, etc., chemicals aimed at killing pests, such as insecticides and pesticides, are sprayed to exterminate the pests that occur. Although these insecticides and agricultural chemicals have considerable effects, they are temporary and there are concerns about environmental pollution and adverse effects on the human body. Therefore, from the viewpoint of handling and hygiene, a common method is to install a trap made of a support such as cardboard or a plastic sheet with an adhesive layer in the path of the small organisms, and to adhesively capture the small organisms.

In addition, in recent years, in order to investigate foreign matter contamination and hygiene in various factories, warehouses, various workplaces, etc., traps with adhesive layers on supports such as cardboard and plastic sheets have been installed and held for a certain period of time. Increasingly, surveys are being conducted on the number of pests caught in

Various types of compositions for capturing small organisms are known for use in the above-mentioned applications, including those disclosed in Patent Documents 1 and 2 below.

Patent Document 1 includes components (1) to (4);
Component (1): ABA type styrene-diene block copolymer with a weight average molecular weight of 50,000 to 500,000 and a styrene content of 10 to 30 mol%;
Component (2): tackifier resin with a softening point of 65°C or higher;
Component (3): tackifying resin that is liquid at 25°C;
Component (4): Liquid rubber containing liquid polybutene with a number average molecular weight of 200 to 2,500 (however, the total amount of component (2) and component (3) is 55 to 200 parts by weight per 100 parts by weight of component (1)) parts by weight)
A pressure-sensitive adhesive for capturing small organisms is disclosed, which contains the following as an essential component. Further, it is described that a certain pressure-sensitive adhesive for capturing small organisms is excellent in cold flow, peelability from release paper, capture rate, and maintenance of capture performance.

Patent Document 2 discloses (1) 100 parts by weight of a styrene thermoplastic elastomer with an intrinsic viscosity [η] of 1 dl/g or more measured in decalin at 135°C, and (2) a number average molecular weight of 250 parts by weight. ~5,000 parts by weight of a softener, and 200 to 3,000 parts by weight of (3) natural or synthetic tackifying resin with a softening point of 60°C or higher, and the stress when pushed 15 mm at room temperature is 0.15 kg or less discloses a hot melt adhesive composition for capturing small animals, which has an elongation of 60 mm or more when pulled up, and a stress of 0.05 Kg or more when pulled up by 60 mm. Further, it is described that a certain hot melt adhesive composition has excellent adhesiveness, flow resistance, and ability to follow captured small animals.

Patent No. 4215364 Patent No. 5052086

However, when forming an adhesive layer using the compositions disclosed in Patent Documents 1 and 2 and using it for capturing small organisms, even if the adhesive layer has excellent flow resistance at room temperature, it is necessary to At high temperatures (up to 80°C), sagging may occur and flow resistance may be poor. In this regard, it is conceivable to increase the viscosity of the composition in order to improve its flow resistance at high temperatures, but in that case it may be difficult to coat it on a release paper. In addition, a composition for forming an adhesive layer for capturing small organisms is required to have good ball tack properties, which is a measure of good repellency, but compositions that have the above properties (hot melt compositions) are also required. ) has not yet been developed.

Therefore, the present invention has excellent ball tack properties and flow resistance at room temperature and high temperature, and can be easily applied to release paper, and is particularly suitable for forming adhesive layers of small organism traps. The purpose is to provide a hot melt composition.

As a result of intensive research aimed at solving the above problems, the present inventors found that a specific hot melt composition containing butyl rubber, a liquid plasticizer, an olefin having a specific softening point, and a tackifying resin in a predetermined proportion can achieve the above objectives. We have discovered what can be achieved and have completed the present invention.

That is, the present invention relates to the following hot melt composition.

1. Contains butyl rubber A, liquid plasticizer B, olefin C with a softening point of 110 ° C. or higher, and tackifying resin D, and the liquid plasticizer B contains process oil,
(1) The content of the liquid plasticizer B is 220 to 420 parts by mass based on 100 parts by mass of the butyl rubber A,
(2) The content of the olefin C is 15 to 90 parts by mass based on 100 parts by mass of the butyl rubber A,
(3) The content of the tackifier resin D is 150 to 350 parts by mass based on 100 parts by mass of the butyl rubber A.
A hot melt composition characterized by:
2. 2. The hot melt composition according to item 1 above, wherein the softening point of the olefin C is 120°C or higher.
3. 3. The hot melt composition according to item 1 or 2 above, wherein the tackifying resin D has a softening point of 90° C. or higher.
4. The hot melt composition according to any one of items 1 to 3 above, which has a melt viscosity at 180° C. of 20,000 mPa·s or less.
5. 5. The hot melt composition according to any one of items 1 to 4 above, further comprising a styrenic block copolymer E.
6. The styrenic block copolymer E is a styrene-isoprene-styrene (SIS) copolymer, a styrene-ethylene-butylene-styrene (SEBS) copolymer, a styrene-ethylene-propylene-styrene (SEPS) copolymer, and a styrene-based block copolymer E. - The hot melt composition according to item 5, which is at least one selected from the group consisting of butylene-butadiene-styrene (SBBS).
7. 7. The hot melt composition according to any one of items 1 to 6 above, which is used to form an adhesive layer of a small organism trap.

The hot melt composition of the present invention contains butyl rubber, a liquid plasticizer, an olefin having a specific softening point, and a tackifying resin in a predetermined ratio, thereby improving ball tack properties and flow resistance at room temperature and high temperature. It has excellent properties and is easy to apply to release paper, making it particularly suitable for forming adhesive layers for small organism traps.

Hereinafter, the hot melt composition of the present invention will be explained in detail.

The hot melt composition of the present invention contains butyl rubber A, liquid plasticizer B, olefin C having a softening point of 110°C or higher, and tackifier resin D,
(1) The content of the liquid plasticizer B is 220 to 420 parts by mass based on 100 parts by mass of the butyl rubber A,
(2) The content of the olefin C is 15 to 90 parts by mass based on 100 parts by mass of the butyl rubber A,
(3) The content of the tackifier resin D is 150 to 350 parts by mass based on 100 parts by mass of the butyl rubber A.
It is characterized by

The hot melt composition of the present invention having the above-mentioned characteristics contains butyl rubber, a liquid plasticizer, an olefin having a specific softening point, and a tackifying resin in a predetermined proportion, thereby improving ball tack properties and properties at room temperature and high temperature. It has excellent flow resistance and can be easily applied to release paper, making it particularly suitable for forming adhesive layers in small organism traps.

In addition, "excellent ball tackiness" means that the hot melt composition of the present invention and the adhesive layer formed therefrom have adhesiveness suitable for capturing small organisms at least at room temperature. "Excellent flow resistance at room temperature and high temperature" means that the adhesive layer does not change shape not only at room temperature but also at high temperature (particularly 60 to 80° C.). In addition, "it is easy to coat the release paper" means that the hot melt composition has good intermittent coating properties on the release paper at a coating temperature of 160 to 180°C. This refers to the fact that the glue (composition) is less likely to become stringy and dirty at the end of the process, in other words, that it "cuts easily".

Butyl rubber A
The hot melt composition of the present invention contains butyl rubber A. Butyl rubber A imparts adhesive strength and insect-catching properties (particularly drawability) to the hot melt composition. Spreadability is a property that improves insect-catching property, and refers to the property of entangling small organisms by drawing the thread. Butyl rubber is a copolymer of isobutene (isobutylene) and a small amount of isoprene (isobutylene-isoprene rubber).

The type of butyl rubber A is not particularly limited, and examples thereof include recycled butyl rubber, synthetic butyl rubber, and the like. The weight average molecular weight of butyl rubber A is not limited, but from the viewpoint of the viscosity of the hot melt composition, it is preferably 300,000 to 700,000, more preferably 400,000 to 600,000. Note that the weight average molecular weight in this specification is a measured value obtained by conversion using standard polystyrene using a gel permeation chromatography measuring device.

The weight average molecular weight of the butyl rubber A can be measured, for example, using the measuring device and measurement conditions described below.
Measuring device: Manufactured by Waters, product name “ACQUITY APC”
Measurement conditions: Column - ACQUITY APC XT45 1.7 μm x 1 - ACQUITY APC XT125 2.5 μm x 1 - ACQUITY APC XT450 2.5 μm x 1 Mobile phase: Tetrahydrofuran 0.8 mL/min Sample concentration: 0.2 mass %
Detector: Differential refractive index (RI) detector Standard material: Polystyrene (manufactured by Waters, molecular weight: 266-1,800,000)
Column temperature: 40℃
RI detector temperature: 40℃
Butyl rubber A can be used alone or in combination of two or more.

As the butyl rubber A, commercially available products can be used. Commercially available products include "Butyl Rubber B065" manufactured by JSR, "Butyl Rubber 268" manufactured by JSR, and "Butyl Rubber 365" manufactured by JSR.

Compared to conventional styrene-based thermoplastic elastomers, butyl rubber A does not have hard segments like styrene blocks, so it can be expected to have lower cohesive force, which improves the drawability of hot melt compositions. becomes.

Liquid plasticizer B
The hot melt composition of the present invention contains liquid plasticizer B. Note that the above-mentioned "liquid" means that it has fluidity at 25° C. (that is, when it is put into a container, it changes its shape to match the container). The liquid plasticizer B is not particularly limited, and examples thereof include polybutene, paraffinic process oil, naphthenic process oil, aromatic process oil, liquid paraffin, hydrocarbon synthetic oil, and the like. Among these liquid plasticizers B, at least one of polybutene and process oil is preferred. Further, as the process oil, at least one of paraffinic process oil and naphthenic process oil is more preferable, and paraffinic process oil is particularly preferable in terms of improving flow resistance at high temperatures.

Liquid plasticizer B can be used alone or in combination of two or more.

The polybutene is not particularly limited, and examples thereof include homopolymers of isobutene, copolymers of isobutene and n-butene, and the like.

As the polybutene, commercially available products can be used. Commercially available products include, for example, "Indopol H-100" manufactured by Ineos, "Nisseki Polybutene" manufactured by Nippon Petrochemicals, and "Tetrax" manufactured by Nippon Petrochemicals.

Although the number average molecular weight of polybutene is not limited, it is preferably 900 to 2,100, more preferably 900 to 1,800. When the number average molecular weight of the polybutene is 900 or more, the ball tack properties of the hot melt composition are improved and the composition has good flow resistance at room temperature and high temperature. Further, when the number average molecular weight of the polybutene is 2,100 or less, the hot melt composition becomes a composition that can be suitably coated with a slot coater. Note that the number average molecular weight in this specification is a value measured according to ASTM D 3536.

As the paraffinic process oil, commercially available products can be used. Commercially available products include, for example, "PW-32" manufactured by Idemitsu Kosan, "Diana Fresia S-32" manufactured by Idemitsu Kosan, "PS-32" manufactured by Idemitsu Kosan, and "Diana Process Oil PS-90" manufactured by Idemitsu Kosan. ”, etc.

As the naphthenic process oil, commercially available products can be used. Commercially available products include, for example, "Diana Fresia N-28" manufactured by Idemitsu Kosan, "Diana Fresia N-90" manufactured by Idemitsu Kosan, "Diana Fresia U-46" manufactured by Idemitsu Kosan, and "Diana Process" manufactured by Idemitsu Kosan. Oil NR" and the like.

As the aromatic process oil, commercially available products can be used. Commercially available products include, for example, "Aromax" manufactured by Nippon Oil Co., Ltd.

Although the number average molecular weight of these process oils is not limited, it is preferably from 200 to 700, more preferably from 300 to 600.

As the liquid paraffin, commercially available products can be used. Commercially available products include "P-100" manufactured by MORESCO and "Kaydol" manufactured by Sonneborn.

As the hydrocarbon synthetic oil, commercially available products can be used. Commercially available products include "Lucant HC-10" manufactured by Mitsui Chemicals, "Lucant HC-20" manufactured by Mitsui Chemicals, and the like.

The content of liquid plasticizer B may be from 220 to 420 parts by weight based on 100 parts by weight of butyl rubber A, and particularly preferably from 240 to 350 parts by weight. When the content of liquid plasticizer B is 220 parts by mass or more, the hot melt composition has good flexibility and ball tack properties are improved. Moreover, when the content of liquid plasticizer B is 420 parts by mass or less, the composition has good flow resistance at room temperature and high temperature.

Olefin C with a softening point of 110°C or higher
The hot melt composition of the present invention contains olefin C (hereinafter also referred to as "olefin C") having a softening point of 110° C. or higher. The olefin C is not particularly limited as long as it satisfies the requirement of a softening point of 110° C. or higher, and examples thereof include polypropylene, polypropylene copolymers, polyethylene copolymers, and the like. In particular, as the polypropylene copolymer, for example, an amorphous polyα-olefin (so-called APAO) is preferable, and a propylene-1-butene copolymer is particularly preferable.

The softening point of olefin C may be 110°C or higher, preferably 120°C or higher, and more preferably 125 to 165°C. In addition, the softening point of olefin C in this specification means a ring and ball softening point temperature, and is a value measured based on JIS K2207. By having the softening point of olefin C within this range, it is possible to ensure good ball tack properties and to exhibit good flow resistance at room temperature and high temperature.

Although the melt viscosity of Olefin C at 180° C. is not limited, it is preferably 1,000 to 60,000 mPa·s. Further, the melt viscosity at 190° C. is not limited, but it is preferably 1,000 to 50,000 mPa·s. When the melt viscosity of olefin C is within this range, it becomes easy to ensure good ball tack properties and good flow resistance at room temperature and high temperature.

Note that the "melt viscosity" in this specification is the viscosity of a hot melt composition that has been heated to a molten state at a constant temperature. The melt viscosity at 180°C is a value obtained by heating and melting the hot melt composition and measuring the viscosity of the melted state at 180°C using a Brookfield RVT viscometer (spindle No. 29). Furthermore, the melt viscosity at 190°C is obtained by changing 180°C to 190°C in the above measurement method.

The content of olefin C may be 15 to 90 parts by weight based on 100 parts by weight of butyl rubber A, and 15 to 80 parts by weight is particularly preferable. When the content of olefin C is 15 parts by mass or more, the hot melt composition of the present invention has good flow resistance at room temperature and high temperature. Moreover, when the content of olefin C is 90 parts by mass or less, the ball tack properties of the hot melt composition of the present invention are improved.

Tackifying resin D
The hot melt composition of the present invention contains tackifying resin D. The tackifier resin D is not particularly limited, and examples thereof include rosin compounds, terpene compounds, petroleum resins, and the like.

Examples of the rosin compounds include natural rosin, modified rosin, glycerol ester of natural rosin, glycerol ester of modified rosin, pentaerythritol ester of natural rosin, and pentaerythritol ester of modified rosin.

Examples of the terpene compounds include copolymers of natural terpenes, three-dimensional polymers of natural terpenes, hydrogenated derivatives of copolymers of natural terpenes, terpene resins, hydrogenated derivatives of phenolic modified terpene resins, and the like.

Examples of the petroleum resin include petroleum resins such as C5 petroleum resin, C9 petroleum resin, C5C9 petroleum resin, and dicyclopentadiene petroleum resin. Also included are hydrogenated petroleum resins (partially hydrogenated petroleum resins, fully hydrogenated petroleum resins) obtained by hydrogenating these petroleum resins. Among the hydrogenated petroleum resins, partially hydrogenated petroleum resins are more preferable because they have high compatibility with the butyl rubber A and excellent heat stability. In addition, C5-based petroleum resin is a petroleum resin made from the C5 fraction of petroleum, C9-based petroleum resin is a petroleum resin made from the C9 fraction of petroleum, and C5C9-based petroleum resin is made from the C5 fraction of petroleum. It is a petroleum resin made from C9 fraction and C9 fraction. Examples of the C5 fraction include cyclopentadiene, isoprene, and pentane. Examples of the C9 fraction include styrene, vinyltoluene, indene, and the like. As the C5-based petroleum resin and the C5C9-based petroleum resin, those containing dicyclopentadiene (DCPD) derived from cyclopentadiene, which is a type of C5 fraction, in the skeleton are preferable.

As the tackifier resin D, petroleum resins (including partially hydrogenated petroleum resins and fully hydrogenated petroleum resins) are preferable because they are excellent in odor and thermal stability of the hot melt composition, and partially hydrogenated petroleum resins and Fully hydrogenated petroleum resins are more preferred.

The tackifying resin D can be used alone or in combination of two or more.

Although the softening point temperature of the tackifier resin D is not limited, it is preferably 90°C or higher, more preferably 100°C or higher. Although the upper limit of the softening point temperature is not limited, it is about 130°C. When the softening point of the tackifier resin D is 90° C. or higher, the hot melt composition of the present invention can exhibit good flow resistance at room temperature and high temperature.

The content of the tackifying resin D may be 150 to 350 parts by weight based on 100 parts by weight of the butyl rubber A, and 180 to 320 parts by weight is particularly preferable. When the content of the tackifying resin D is 150 parts by mass or more, the coatability when coating the hot melt composition of the present invention on a release paper becomes good. Moreover, when the content of the tackifier resin D is 350 parts by mass or less, the ball tack properties of the hot melt composition of the present invention are improved and good drawability can be exhibited.

The tackifying resin D can be used alone or in combination of two or more.

As the tackifier resin D, commercially available products can be used. Commercially available products include, for example, "HA-103" manufactured by TonenGeneral Sekiyu, "HB-103" manufactured by TonenGeneral Sekiyu, "HB-125" manufactured by TonenGeneral Sekiyu, and "Alcon P-90" manufactured by Arakawa Chemical. , "Alcon M-100" manufactured by Arakawa Chemical Co., Ltd., "Imarv P100" manufactured by Idemitsu Kosan, "Skoretz SU400" manufactured by Kolon, and "YS Resin TO-105" manufactured by Yasuhara Chemical.

Styrenic block copolymer E
The hot melt composition of the present invention may contain a styrenic block copolymer E in addition to the above-mentioned butyl rubber A, liquid plasticizer B, olefin C, and tackifier resin D. By containing the styrenic block copolymer E, good flow resistance at high temperatures (particularly about 70 to 80° C.) can be easily obtained.

The styrenic block copolymer E is preferably a styrenic thermoplastic elastomer and/or a hydrogenated product thereof. For example, the styrenic thermoplastic elastomer is a styrene-isoprene-styrene (SIS) copolymer, Examples include at least one styrenic thermoplastic elastomer selected from the group consisting of styrene-butadiene-styrene (SBS) copolymer and styrene-isoprene/butadiene-styrene (SIBS) copolymer.

The mode of hydrogenation in the hydrogenated product of the above-mentioned styrenic thermoplastic elastomer may be either complete hydrogenation (complete hydrogenation) or partial hydrogenation (partial hydrogenation). Specifically, as a hydrogenated product, are styrene-ethylene-butylene-styrene (SEBS) copolymer, styrene-ethylene-propylene-styrene (SEPS) copolymer, styrene-ethylene-ethylene-propylene-styrene (SEEPS) copolymer, and styrene-butylene- At least one selected from the group consisting of butadiene-styrene (SBBS) copolymers is included.

In the present invention, among these styrenic block copolymers E, at least one selected from the group consisting of SIS, SEBS, SEPS, and SBBS is used as a styrenic block copolymer because it has a small difference in solubility parameter from butyl rubber. It is preferable to contain.

Specifically, the SEBS is a fully hydrogenated SBS. The above SEPS is a completely hydrogenated product of SIS. SEEPS is a fully hydrogenated version of SIBS. Moreover, SBBS is a partially hydrogenated product of SBS. The above-mentioned SIS, SEBS, SEPS, and SBBS form styrene domains that increase cohesive force, so that the styrene domains are easily diffused throughout the hot melt composition and have an advantageous effect on the development of good flow resistance at room temperature and high temperature. considered to be a thing. In addition, as mentioned above, it has good compatibility with butyl rubber in that the difference in solubility parameters is small, and even when exposed to high temperatures for a long time, it has heat stability and easily suppresses the generation of carbides.

The styrene content of the styrenic block copolymer is preferably 10 to 40% by mass, more preferably 15 to 35% by mass, and 12 to 35% by mass based on 100% by mass of each styrenic block copolymer (hydrogenated material). % is more preferable, and 13 to 30% by weight is most preferable. By keeping the styrene content within this range, good flow resistance at high temperatures (especially around 70 to 80°C) can be easily obtained.

As the SIS copolymer, commercially available products can be used. Examples of commercially available products include Quintac 3433N manufactured by Nippon Zeon Co., Ltd. and D1161 manufactured by Clayton Polymer Co., Ltd., for example.

As the SEBS copolymer, commercially available products can be used. Examples of commercially available products include G1726 manufactured by Kraton Polymer, G1650 manufactured by Kraton Polymer, and G1645 manufactured by Kraton Polymer.

As the SEPS copolymer, commercially available products can be used. Commercially available products include, for example, SEPTON2063 manufactured by Kuraray Co., Ltd. and SEPTON2005 manufactured by Kuraray Co., Ltd.

As the SEEPS copolymer, commercially available products can be used. Commercially available products include, for example, SEPTON4033 manufactured by Kuraray Co., Ltd. and SEPTON4055 manufactured by Kuraray Co., Ltd.

The number average molecular weight of the styrenic block copolymer is preferably in the range of 10,000 to 220,000, more preferably in the range of 20,000 to 210,000, and more preferably in the range of 23,000 to 200,000. The range is more preferred. By being within this range, good flow resistance at high temperatures (particularly about 70 to 80° C.) can be easily obtained. Note that the number average molecular weight in this specification is a value measured according to ASTM D 3536.

The content of the styrenic block copolymer E is preferably 15 to 35 parts by weight, particularly preferably 20 to 35 parts by weight, based on 100 parts by weight of the butyl rubber A. When the content of the styrenic block copolymer E is within this range, good flow resistance at high temperatures (particularly about 70 to 80° C.) can be easily obtained.

Other Additives The hot melt composition of the present invention may contain other additives as long as they do not essentially impede the object of the present invention. Examples include antioxidants, ultraviolet absorbers, and the like.

As antioxidants, 2,6-di-t-butyl-4-methylphenol, n-octadecyl-3-(4'-hydroxy-3',5'-di-t-butylphenyl)propionate, 2, 2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), 2,4-bis(octylthiomethyl)-o-cresol, 2 -t-butyl-6-(3-t-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenylacrylate, 2,4-di-t-amyl-6-[1-(3,5 -di-t-amyl-2-hydroxyphenyl)ethyl]phenylacrylate, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)]acrylate, tetrakis[methylene-3-(3, Hindered phenolic antioxidants such as 5-di-t-butyl-4-hydroxyphenyl)propionate] methane; dilaurylthiodipropionate, laurylstearylthiodipropionate, pentaerythritol tetrakis (3-laurylthiopropionate) Examples include sulfur-based antioxidants such as tris(nonylphenyl) phosphite and tris(2,4-di-t-butylphenyl) phosphite.

Antioxidants can be used alone or in combination of two or more.

As ultraviolet absorbers, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-t-butylphenyl)benzotriazole, 2-(2' Benzotriazole UV absorbers such as -hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole; Benzophenone UV absorbers such as 2-hydroxy-4-methoxybenzophenone; Salicylic acid esters Examples include ultraviolet absorbers; cyanoacrylate ultraviolet absorbers; and hindered amine light stabilizers.

The ultraviolet absorbers can be used alone or in combination of two or more.

The total content of the other additives in the hot melt composition of the present invention is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 5 parts by weight, based on 100 parts by weight of butyl rubber A.

By setting the total content of the other additives within the above range, it is possible to impart superior thermal stability and coating suitability to the hot melt composition of the present invention, and also to provide the hot melt composition of the present invention with desired properties. performance can be imparted.

Physical Properties of Hot Melt Composition As used herein, "melt viscosity" refers to the viscosity of a hot melt composition heated to a molten state at a constant temperature. The melt viscosity at 180°C is a value obtained by heating and melting the hot melt composition and measuring the viscosity of the melted state at 180°C using a Brookfield RVT viscometer (spindle No. 29).

The hot melt composition of the present invention preferably has a melt viscosity at 180° C. of 20,000 mPa·s or less. When the melt viscosity at 180° C. exceeds 20,000 mPa·s, the coating suitability of the hot melt composition of the present invention may be reduced. The melt viscosity at 180° C. is preferably 4,500 to 20,000 mPa·s, more preferably 9,000 to 15,000 mPa·s. By setting the melt viscosity at 180°C within the above range, the coating suitability of the hot melt composition of the present invention is further improved.

As used herein, the "softening point" of the hot melt composition is the melting temperature of the hot melt composition that can be measured by the R&B method (Japan Adhesive Industry Association Standard JAI 7). The hot melt composition of the present invention has a softening point temperature of 60 to 90°C. By being within this range, it is possible to obtain small organism trapping performance and good flow resistance at room temperature and high temperature.

"Ball tack" in this specification is a value that can be measured based on the tack test method (rolling ball method, 23° C.) of JIS Z0237.

The hot melt composition of the present invention preferably has a ball tack of 24 or more, more preferably 24 to 32, at 23°C. By being within the ball tack range, it has excellent performance in capturing small organisms at room temperature.

The hot melt composition of the present invention can be suitably used as an adhesive layer of a trap for trapping small organisms such as pests such as cockroaches and flies.

Examples of the present invention will be described below. The invention is not limited to the examples below.

The raw materials used in the Examples and Comparative Examples are as follows.
<Butyl rubber A>
・Butyl Rubber A1: Butyl Rubber B065 manufactured by JSR Corporation
(Weight average molecular weight 430,000)
・Butyl Rubber A2: Butyl Rubber 268 manufactured by JSR Corporation
(Weight average molecular weight 580,000)
・Butyl Rubber A3: Butyl Rubber 365 manufactured by JSR Corporation
(Weight average molecular weight 460,000)

<Liquid plasticizer B>
・Liquid polybutene B1: Indopol H-100 manufactured by Ineos
(Number average molecular weight 910)
・Napthenic process oil B2: Diana Fresia N-90 manufactured by Idemitsu Kosan Co., Ltd.
(Number average molecular weight 410)
・Paraffinic process oil B3: Diana process oil PS-90 manufactured by Idemitsu Kosan Co., Ltd. (number average molecular weight 533)

<Olefin C with a softening point of 110°C or higher>
・Olefin C1: EVONIK VP828
(Propylene-1-butene copolymer (APAO), softening point 161°C, melt viscosity at 180°C 3,3000 mPa・s, melt viscosity 25,000 mPa・s at 190°C)
・Olefin C2: EVONIK VP750 (comparison product)
(Propylene-1-butene copolymer (APAO), softening point 107°C, 180°C melt viscosity 6,2000 mPa・s, 190°C melt viscosity 50,000 mPa・s)
・Olefin C3: Chiba Fine Chemical Sun Attack M
(Mixture of PP, PP-1 butene, PE-PP, PE (APAO), softening point 123°C, melt viscosity at 180°C 1,300 mPa・s, melt viscosity at 190°C 670 mPa・s)
・Olefin C4: Aerafin17 manufactured by EASTMAN
(PP copolymer (APAO), softening point 130°C, 180°C melt viscosity 2,000 mPa・s, 190°C melt viscosity 1,700 mPa・s)

<Tackifying resin D>
・Hydrogenated petroleum resin D1: Arkon P-90 manufactured by Arakawa Chemical Industry Co., Ltd.
(Softening point: 90℃)
・Hydrogenated petroleum resin D2: HB-103 manufactured by TonenGeneral Sekiyu Co., Ltd.
(Softening point: 100℃)
・Hydrogenated petroleum resin D3: HB-125 manufactured by TonenGeneral Sekiyu Co., Ltd.
(Softening point: 125℃)

<Styrenic block copolymer E>
・Styrenic block copolymer E1: G1650 manufactured by Clayton
(Styrene-ethylene-butylene-styrene (SEBS), styrene content 30% by mass, number average molecular weight 81,000)
・Styrenic block copolymer E2: G1652 manufactured by Clayton
(Styrene-ethylene-butylene-styrene (SEBS) styrene content 30% by mass, number average molecular weight 62,000)
・Styrenic block copolymer E3: SEPTON 4033 manufactured by Kuraray
(Styrene-ethylene-propylene-styrene (SEPS) styrene content 30% by mass, number average molecular weight 76,000)
・Styrenic block copolymer E4: Asahi Kasei Chemical Tuftec P1500
(Styrene-butadiene-butylene-styrene (SBBS) styrene content 30% by mass, number average molecular weight 50,000)
・Styrenic block copolymer E5: Quintac 3433N manufactured by Nippon Zeon
(Styrene-isoprene-styrene (SIS) styrene content 16% by mass, number average molecular weight 23,000)
・Styrenic block copolymer E6: G1645 manufactured by Clayton
(Styrene-ethylene-butylene-styrene (SEBS) styrene content 13% by mass, number average molecular weight 170,000)
・Styrenic block copolymer E7: D1161 manufactured by Clayton
(Styrene-isoprene-styrene (SIS) styrene content 15% by mass, number average molecular weight 200,000)

Examples 1 to 27 and Comparative Examples 1 to 6
The above-mentioned raw materials were put into a stirring kneader equipped with a heating device in the amounts shown in Tables 1 to 3, and heated and kneaded at 145° C. for 90 minutes to produce hot melt compositions.

The properties of the obtained hot melt composition were evaluated under the following measurement conditions.

(melt viscosity)
The hot melt composition was heated and melted, and the viscosity of the melted state at 180° C. was measured using a Brookfield RVT viscometer (spindle No. 29).

(softening point)
The hot melt composition was heated and melted and measured according to the method specified by the Japan Adhesive Industry Association standard JAI 7.

(ball tuck)
The hot melt composition is applied onto release paper by slot coating at a coating temperature of 160°C to 180°C.

Next, a test piece is obtained by transferring it to a separately prepared cardboard. The coating amount is 350 g/m ² and the coating width is 50 mm. The coated test piece at this time is stored for 24 hours in an atmosphere of 23° C. and 50% relative humidity to cool the hot melt composition.

Next, the release paper was peeled off, measurements were taken based on the tack test method (rolling ball method) of JIS Z0237, the test piece was placed on a stand tilted at 30°C, and the ball was rolled at a run-up distance of 10cm. Record the maximum size of the ball that stopped on the hot melt composition.

(Flow resistance)
Using a test piece prepared in the same manner as the ball tack measurement method described above, it was cut into a size of 100 mm x 50 mm, and the test piece was placed at 60 mm so that the longitudinal direction (the direction in which the hot melt composition was applied) was located above and below. It was stored vertically in a constant temperature bath controlled at ℃ and cured for 12 hours. After 12 hours, it was taken out from the thermostatic oven, and the shape change of the lower surface in the longitudinal direction was evaluated according to the following criteria.

Similarly, flow resistance was evaluated under the conditions of 70°C x 12 hours, 80°C x 12 hours, and 80°C x 48 hours.

Note that if the evaluation is ○ or higher, it can be evaluated that there is no problem in actual use.
◎: Deformation of 0 mm or more and less than 2 mm is observed.
○: Deformation of 2 mm or more and less than 5 mm is observed (no problem in actual use).
Δ: Deformation of 5 mm or more and less than 10 mm is observed.
×: Deformation of 11 mm or more is observed.

The results are shown in Tables 1 to 3.

As is clear from the results in Tables 1 to 3, the hot melt compositions prepared in Examples 1 to 27 that meet the predetermined requirements have good ball tack properties (an indicator of insect trapping properties) and flow resistance at room temperature and high temperature. It is found that it has excellent properties and is easy to apply to release paper, making it particularly suitable for forming adhesive layers for small organism traps. On the other hand, the hot melt compositions prepared in Comparative Examples 1 to 6, which did not meet the predetermined requirements, had insufficient ball tack properties (indicator of insect trapping properties), especially in Comparative Examples 1, 4, and 6. In Examples 2, 3, 4, and 6, the flow resistance at high temperatures (especially 80°C) was insufficient, and in Comparative Example 5, the melt viscosity at 180°C was too high, making it difficult to coat on release paper. I know it will happen.

Claims (7)

Contains butyl rubber A, liquid plasticizer B, olefin C with a softening point of 110 ° C. or higher, and tackifying resin D, and the liquid plasticizer B contains process oil,
(1) The content of the liquid plasticizer B is 220 to 420 parts by mass based on 100 parts by mass of the butyl rubber A,
(2) The content of the olefin C is 15 to 90 parts by mass based on 100 parts by mass of the butyl rubber A,
(3) The content of the tackifier resin D is 150 to 350 parts by mass based on 100 parts by mass of the butyl rubber A.
A hot melt composition characterized by: The hot melt composition according to claim 1, wherein the softening point of the olefin C is 120°C or higher. The hot melt composition according to claim 1 or 2, wherein the tackifier resin D has a softening point of 90°C or higher. The hot melt composition according to any one of claims 1 to 3, having a melt viscosity at 180° C. of 20,000 mPa·s or less. The hot melt composition according to any one of claims 1 to 4, further comprising a styrenic block copolymer E. The styrenic block copolymer E is a styrene-isoprene-styrene (SIS) copolymer, a styrene-ethylene-butylene-styrene (SEBS) copolymer, a styrene-ethylene-propylene-styrene (SEPS) copolymer, and a styrene-based block copolymer E. The hot melt composition according to claim 5, which is at least one selected from the group consisting of -butylene-butadiene-styrene (SBBS). The hot melt composition according to any one of claims 1 to 6, which is used to form an adhesive layer of a small organism trap.