JP7283745B2 - hot melt composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot-melt composition excellent in stringiness, high-temperature anti-flow property, and intermittent coating property on release paper, and is particularly useful for forming an adhesive layer of a small creature trap. It relates to hot melt compositions.

In various factories, warehouses, various workshops, agriculture and livestock industries, general households, etc., insecticides, agricultural chemicals, and other agents intended to kill pests are sprayed in order to exterminate pests that occur. Although these insecticides and pesticides 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 sanitation, it is common to install a catcher having an adhesive layer on a support such as cardboard or a plastic sheet in the path of the small creatures to catch the small creatures by adhesion.

In recent years, in order to investigate foreign matter contamination or hygiene in various factories, warehouses, various workplaces, etc., we have installed a catcher with an adhesive layer on a support such as cardboard or plastic sheet. Surveys are increasingly being conducted on the number of pests caught in

As a composition for capturing small organisms used for the above applications, various compositions are known, including Patent Documents 1 and 2 below.

Patent Document 1 describes components (1) to (4);
Component (1): ABA type styrene-diene block copolymer having a weight average molecular weight of 50,000 to 500,000 and a styrene content of 10 to 30 mol%;
Component (2): a tackifying resin having a softening point of 65°C or higher;
Component (3): a tackifying resin that is liquid at 25°C;
Component (4): liquid rubber containing liquid polybutene having a number average molecular weight of 200 to 2500 (however, the total amount of component (2) and component (3) is 55 parts by weight to 200 parts by weight per 100 parts by weight of component (1) weight part)
is disclosed as an essential component for catching small organisms. Further, it is described that the predetermined pressure-sensitive adhesive for trapping small creatures is excellent in cold flow, releasability from release paper, retention of trapping rate and trapping performance.

Patent Document 2 describes (1) 100 parts by weight of a styrene-based thermoplastic elastomer having an intrinsic viscosity [η] of 1 dl/g or more measured in decalin at 135°C, and (2) 300 to 4000 parts by weight of (2) a number average molecular weight of 250. 5,000 to 5,000 parts by weight of a softening agent, and 200 to 3,000 parts by weight of (3) a natural or synthetic tackifying resin having a softening point of 60° C. or higher, and a stress of 0.15 kg or less when pushed 15 mm at room temperature. , discloses a hot-melt adhesive composition for catching 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. Also, it is described that the given hot-melt pressure-sensitive adhesive composition is excellent in adhesiveness, anti-flow property and followability to captured small animals.

Japanese Patent No. 4215364 Japanese Patent No. 5052086

However, when an adhesive layer is formed using the compositions disclosed in Patent Documents 1 and 2 and used for capturing small organisms, even if the adhesive layer has excellent flow resistance at room temperature, high temperatures (especially 80 to 100 °C), sagging may occur and the flow resistance may be poor. In this respect, it is conceivable to increase the viscosity of the composition in order to improve the flow resistance at high temperatures, but in that case intermittent coating on the release paper may become difficult. In addition, the composition for forming the adhesive layer for capturing small organisms is also required to have good stringing properties, which is a measure of good insect repelling properties. ) has not yet been developed.

Therefore, the present invention provides a hot-melt composition that is excellent in stringiness, high-temperature anti-flow property, and intermittent coating property on release paper, and is particularly suitable for use in forming the adhesive layer of a small creature trap. intended to

As a result of intensive research to solve the above problems, the present inventors have 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 predetermined proportions achieves the above object. We have found that it can be achieved, and have completed the present invention.

That is, the present invention relates to the following hot-melt compositions.
1. A hot melt composition containing a butyl rubber A, a liquid plasticizer B, an olefin C having a softening point of 110° C. or higher and 180° C. or lower, and a tackifying resin D,
(1) The content of the liquid plasticizer B is 180 to 550 parts by mass with respect to 100 parts by mass of the butyl rubber A,
(2) the content of the olefin C is 40 to 320 parts by mass with respect to 100 parts by mass of the butyl rubber A;
(3) The content of the tackifying resin D is 10 to 430 parts by mass with respect to 100 parts by mass of the butyl rubber A,
(4) The hot melt composition has a melt viscosity of 9,000 mPa s or less at 180° C. and is used to form an adhesive layer of a small organism trap.
A hot melt composition characterized by:
2. When the mass part of the liquid plasticizer B is B, the mass part of the tackifying resin D is D, and the mass part of the olefin C is C, the ratio represented by (B + D) / C is 2.0 to 20. 2. The hot melt composition according to item 1, wherein the hot melt composition is 0.0.
3. 3. The hot-melt composition according to item 2, wherein the ratio represented by (B+D)/C is from 2.0 to 14.0.
4. 4. The hot melt composition according to any one of Items 1 to 3, wherein the softening point of the olefin C is 120°C or higher and 140°C or lower.
5. 5. The hot melt composition according to any one of Items 1 to 4, wherein the tackifying resin D has a softening point of 90°C or higher.

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 predetermined proportions, thereby improving stringiness, high-temperature flow resistance, and releasing paper. It has excellent intermittent coating properties, and is particularly suitable for forming the adhesive layer of small organism traps.

The hot-melt composition of the present invention will be described in detail below.

The hot melt composition of the present invention contains a butyl rubber A, a liquid plasticizer B, an olefin C having a softening point of 110° C. or higher and 180° C. or lower, and a tackifying resin D,
(1) The content of the liquid plasticizer B is 180 to 550 parts by mass with respect to 100 parts by mass of the butyl rubber A,
(2) the content of the olefin C is 40 to 320 parts by mass with respect to 100 parts by mass of the butyl rubber A;
(3) The content of the tackifying resin D is 10 to 430 parts by mass with respect to 100 parts by mass of the butyl rubber A.
It is characterized by

The hot-melt composition of the present invention having the characteristics described above contains butyl rubber, a liquid plasticizer, an olefin having a specific softening point, and a tackifying resin in a predetermined proportion, thereby improving stringiness and high-temperature flow resistance. , and excellent intermittent coating properties on release paper, and is particularly suitable for use in forming the adhesive layer of small organism traps.

The term "excellent stringiness" means that the hot-melt composition of the present invention and the adhesive layer formed therefrom have adhesiveness suitable for trapping small organisms at least at room temperature. "Excellent flow resistance at high temperature" means that the adhesive layer does not change shape not only at normal temperature but also at high temperature (especially 80 to 100°C). "Excellent intermittent coating property on release paper" means that the hot melt composition is intermittently coated on release paper at a coating temperature of 160 to 180 ° C. (coating end It means that stringy stains of time glue (composition) are less likely to occur, that is, "good glue removal"). The term "excellent ball tackiness" described later means that the hot-melt composition of the present invention and the adhesive layer formed therefrom have adhesiveness suitable for catching small organisms at least at room temperature (especially objects that move on the adhesive layer). It means to have stickiness to catch).

Butyl rubber A
The hot melt composition of the present invention contains butyl rubber A. Butyl rubber A imparts adhesive strength and insect trapping properties (particularly stringiness) to the hot melt composition. Stringiness is a characteristic that improves insect-catching properties, and means the characteristic of entangling small organisms by stringiness. Butyl rubber is a copolymer of isobutene (isobutylene) and small amounts 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. Although the weight average molecular weight of butyl rubber A is not limited, it is preferably from 300,000 to 700,000, more preferably from 300,000 to 400,000, from the viewpoint of the viscosity of the hot-melt composition. In addition, the weight average molecular weight in this specification is a measured value obtained by converting with 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 following measurement apparatus and measurement conditions.
Measuring device: Product name “ACQUITY APC” manufactured by Waters
Measurement conditions: Column ACQUITY APC XT45 1.7 μm × 1 ACQUITY APC XT125 2.5 μm × 1 ACQUITY APC XT450 2.5 μm × 1 Mobile phase: Tetrahydrofuran 0.8 mL/min Sample concentration: 0.2 mass %
Detector: Differential refractive index (RI) detector Standard substance: Polystyrene (manufactured by Waters, molecular weight: 266 to 1,800,000)
Column temperature: 40°C
RI detector temperature: 40°C
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 the like.

Since butyl rubber A does not have a hard segment such as a styrene block as compared with conventional styrene-based thermoplastic elastomers, it can be expected to reduce the cohesive force, and as a result, the hot-melt composition has good stringiness. becomes.

Liquid plasticizer B
The hot melt composition of the present invention contains a liquid plasticizer B. The above-mentioned "liquid" means having fluidity at 25°C (that is, changing the shape according to the container when placed in a 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, and hydrocarbon synthetic oil. Among these liquid plasticizers B, at least one of polybutene and process oil is preferable. As the process oil, at least one of paraffinic process oil and naphthenic process oil is more preferred, and paraffinic process oil is particularly preferred from the viewpoint of enhancing flow resistance at high temperatures.

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

Polybutene is not particularly limited, and examples thereof include homopolymers of isobutene and copolymers of isobutene and n-butene.

A commercial item can be used as polybutene. Examples of commercially available products include "10N" manufactured by NOF, "Indopol H-100" manufactured by Ineos, "Nisseki Polybutene" manufactured by Nippon Petrochemical, "Tetrax" manufactured by Nippon Petrochemical and the like. .

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 polybutene has a number average molecular weight of 900 or more, the ball tackiness of the hot-melt composition is improved, and the composition has good flow resistance at high temperatures. Moreover, when the number average molecular weight of the polybutene is 2,100 or less, the hot melt composition can be suitably coated with a slot coater. In addition, the number average molecular weight in this specification is the value measured according to ASTM D3536.

A commercially available product can be used as the paraffinic process oil. Examples of commercially available products include "PW-32" manufactured by Idemitsu Kosan Co., Ltd., "Dianafrecia S32" manufactured by Idemitsu Kosan Co., Ltd., and "PS-32" manufactured by Idemitsu Kosan Co., Ltd.

A commercially available product can be used as the naphthenic process oil. Commercial products include, for example, "KN4010" manufactured by PetroChina, "Diana Frecia N28" manufactured by Idemitsu Kosan Co., Ltd., "Diana Frecia N90" manufactured by Idemitsu Kosan Co., Ltd., "Diana Frecia U46" manufactured by Idemitsu Kosan Co., Ltd., "Diana Frecia" manufactured by Idemitsu Kosan Co., Ltd. process oil NR” and the like.

A commercial product can be used as the aromatic process oil. 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 200-700, more preferably 300-600.

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

A commercially available product can be used as the hydrocarbon-based synthetic oil. Commercially available products include “Lucant HC-10” manufactured by Mitsui Chemicals, “Lucant HC-20” manufactured by Mitsui Chemicals, and the like.

The content of the liquid plasticizer B may be 180 to 550 parts by mass with respect to 100 parts by mass of the butyl rubber A, preferably 200 to 400 parts by mass. When the content of the liquid plasticizer B is 180 parts by mass or more, the hot-melt composition has good flexibility and improved stringiness and ball tack. Further, when the content of the liquid plasticizer B is 550 parts by mass or less, stringiness and ball tackiness are improved. The content of the liquid plasticizer B is preferably 200 to 400 parts by mass from the viewpoint of improving the stringiness and anti-flow property at high temperatures. 300 to 400 parts by mass is preferred.

Olefin C with a softening point of 110°C or higher and 180°C or lower
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 and 180° C. or lower. The olefin C is not particularly limited as long as it satisfies the softening point requirement of 110° C. or more and 180° C. or less, and examples thereof include polypropylene, polypropylene copolymers, and polyethylene copolymers. Particularly preferred polypropylene copolymers are, for example, amorphous poly-α-olefins (so-called APAO), and propylene-1-butene copolymers are particularly preferred.

The softening point of Olefin C may be 110°C or higher and 180°C or lower, preferably 120°C or higher, more preferably 120 to 140°C. In addition, the softening point of olefin C in this specification means ring and ball type softening point temperature, and is a value measured based on JISK2207. When the softening point of Olefin C is within this range, good ball tackiness can be ensured and good anti-flow property can be exhibited even at high temperatures.

Although the melt viscosity of Olefin C at 180° C. is not limited, it is preferably 1,000 to 60,000 mPa·s. Also, the melt viscosity at 190° C. is not limited, but it is preferably 500 to 25,000 mPa·s. When the melt viscosity of Olefin C is within such a range, it becomes easier to ensure good ball tack and good flow resistance at high temperatures.

The "melt viscosity" used herein is the viscosity of a hot-melt composition that has been melted by heating at a certain 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 molten state at 180°C using a Brookfield RVT viscometer (spindle No. 29). The melt viscosity at 190°C is obtained by replacing 180°C with 190°C in the above measuring method.

The content of Olefin C may be 40 to 320 parts by mass (particularly 41 to 320 parts by mass) per 100 parts by mass of butyl rubber A, but 50 to 300 parts by mass is particularly preferable. When the content of Olefin C is 40 parts by mass (especially 41 parts by mass) or more, the hot-melt composition of the present invention has good flow resistance at high temperatures. Further, when the content of olefin C is 320 parts by mass or less, the ball tackiness of the hot melt composition of the present invention is improved. The content of olefin C is preferably 90 to 300 parts by mass from the viewpoint of improving stringiness and anti-flow property at high temperatures, and the content of olefin C is preferably 90 to 200 parts by mass from the viewpoint of improving ball tackiness. part is preferred.

Tackifier resin D
The hot melt composition of the present invention contains a tackifying resin D. The tackifying resin D is not particularly limited, and examples thereof include rosin-based compounds, terpene-based compounds, and petroleum resins.

Examples of the rosin-based compound include natural rosin, modified rosin, glycerol ester of natural rosin, glycerol ester of modified rosin, pentaerythritol ester of natural rosin, pentaerythritol ester of modified rosin, and the like.

Examples of the terpene-based compound include natural terpene copolymers, natural terpene three-dimensional polymers, hydrogenated derivatives of natural terpene copolymers, terpene resins, and hydrogenated derivatives of phenolic modified terpene resins.

Examples of the petroleum resin include petroleum resins such as C5-based petroleum resins, C9-based petroleum resins, C5C9-based petroleum resins, and dicyclopentadiene-based petroleum resins. Hydrogenated petroleum resins obtained by hydrogenating these petroleum resins (partially hydrogenated petroleum resins, fully hydrogenated petroleum resins) are also included. Among the hydrogenated petroleum resins, partially hydrogenated petroleum resins are more preferable because of their high compatibility with the butyl rubber A and excellent heat stability. The C5 petroleum resin is a petroleum resin made from a C5 fraction of petroleum, the C9 petroleum resin is a petroleum resin made from a C9 fraction of petroleum, and the C5C9 petroleum resin is a C5 fraction of petroleum. and a C9 fraction as raw materials. C5 fractions include cyclopentadiene, isoprene, pentane, and the like. The C9 fraction includes styrene, vinyltoluene, indene, and the like. As the C5-based petroleum resin and the C5C9-based petroleum resin, those containing in the skeleton dicyclopentadiene (DCPD) derived from cyclopentadiene, which is a kind of C5 fraction, are preferred.

As the tackifying resin D, petroleum resins (including partially hydrogenated petroleum resins and fully hydrogenated petroleum resins) are preferable in terms of excellent 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 tackifying resin D is 90°C or higher, the hot-melt composition of the present invention can exhibit good flow resistance at high temperatures.

The content of the tackifying resin D may be 10 to 430 parts by mass with respect to 100 parts by mass of the butyl rubber A, and particularly preferably 50 to 430 parts by mass. When the content of the tackifying resin D is 10 parts by mass or more, the intermittent coatability of the hot-melt composition of the present invention when intermittently coated onto a release paper is improved. Further, when the content of the tackifier resin D is 430 parts by mass or less, the ball tackiness of the hot-melt composition of the present invention is improved, and good yarn drawability can be exhibited. The content of the tackifying resin D is preferably 200 to 430 parts by mass from the viewpoint of improving the stringiness and the anti-flow property at high temperatures, and the content of the tackifying resin D is 200 parts from the viewpoint of simultaneously improving the ball tackiness. ~380 parts by mass is preferred.

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

As the tackifying resin D, commercially available products can be used. Commercial products include, for example, "HA-085" manufactured by TonenGeneral Sekiyu, "HA-103" manufactured by TonenGeneral Sekiyu, "HB-103" manufactured by TonenGeneral Sekiyu, and "HB-125" manufactured by TonenGeneral Sekiyu. , Arakawa Chemical Co., Ltd. "Alcon P-90", Arakawa Chemical Co., Ltd. "Alcon M-100", Idemitsu Kosan Co., Ltd. "Imarb P100", Kolon Co., Ltd. "Scoretz SU400", Yasuhara Chemical Co., Ltd. "YS Resin TO-105" etc.

In the hot-melt composition of the present invention, the ratio represented by B/C is 1, where B is the mass part of the liquid plasticizer B, D is the mass part of the tackifier resin D, and C is the mass part of the olefin C. It is preferably in the range of 0.2 to 7.0. Moreover, it is preferable that the ratio represented by D/C is in the range of more than 0 and 7.0 or less. Furthermore, it is preferable that the ratio represented by (B+D)/C is 2.0 to 20.0. In particular, the ratio represented by (B+D)/C is preferably in the range of 2.0 to 14.0 among 2.0 to 20.0, more preferably in the range of 2.0 to 8.0. . Within this range, the hot-melt composition is excellent in stringing properties, high-temperature flow resistance, and intermittent coating properties on release paper, and is particularly suitable for use in forming the adhesive layer of a small creature trap. becomes easier to obtain.

Other Additives The hot-melt composition of the present invention may contain other additives to the extent that the objects of the present invention are not essentially hindered. Examples include antioxidants, ultraviolet absorbers, and the like.

Antioxidants include 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]phenyl acrylate, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)]acrylate, tetrakis[methylene-3-(3, 5-di-t-butyl-4-hydroxyphenyl)propionate]methane; hindered phenolic antioxidants; sulfur-based antioxidants such as tris (nonylphenyl) phosphite and tris (2,4-di-t-butylphenyl) phosphite;

An antioxidant can be used individually or in mixture of 2 or more types.

UV absorbers include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-t-butylphenyl)benzotriazole, 2-(2' -Hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole and other benzotriazole UV absorbers; 2-hydroxy-4-methoxybenzophenone and other benzophenone UV absorbers; salicylate esters UV absorbers; cyanoacrylate UV absorbers; hindered amine light stabilizers.

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 mass, more preferably 0.5 to 5 parts by mass, per 100 parts by mass of butyl rubber A.

By setting the total content of the other additives in the above range, the hot melt composition of the present invention can be provided with excellent thermal stability and coatability, and the hot melt composition of the present invention can have the desired performance can be given.

Physical properties of hot-melt composition The term "melt viscosity" used herein is the viscosity of a hot-melt composition that has been heated and melted at a certain 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 molten state at 180°C using a Brookfield RVT viscometer (spindle No. 29).

The hot-melt composition of the present invention preferably has a 180° C. melt viscosity of 9,000 mPa·s or less. If the 180° C. melt viscosity exceeds 9,000 mPa·s, the coatability of the hot melt composition of the present invention may deteriorate. The 180° C. melt viscosity is preferably 100 to 7,000 mPa·s, more preferably 400 to 4,000 mPa·s. By setting the melt viscosity at 180°C within the above range, the intermittent coating suitability of the hot melt composition of the present invention is further improved.

As used herein, the "softening point" of a 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 preferably has a softening point temperature of 60 to 110°C. Within this range, small creature trapping performance and good anti-flow effects at high temperatures can be obtained.

The "stringing property" in this specification is evaluated by measuring the stringing stress. Specifically, a probe having an adhesion area of 80 mm ² was sunk into an adhesive block formed from the hot-melt composition of the present invention by 5 mm at 10 mm/min, and then lifted by 25 mm at 300 mm/min. The maximum value of the stress at that time is taken as the stringing stress measurement value. The stringing stress is preferably 3.0 N or more, and the higher the stress, the stronger the stickiness.

“Ball tack” as used herein 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. When the ball tack is within such a range, the ability to trap small organisms at room temperature is excellent.

The hot-melt composition of the present invention can be suitably used as an adhesive layer of traps for trapping small creatures such as cockroaches and flies.

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

The raw materials used in Examples and Comparative Examples are as follows.

<Butyl Rubber A>
・Butyl rubber A1: Butyl Rubber B065 manufactured by JSR
(Weight average molecular weight 430,000)
・Butyl rubber A2: Butyl Rubber 268 manufactured by JSR
(weight average molecular weight 580,000)

<Liquid plasticizer B>
・Liquid polybutene B1: 10N manufactured by NOF Corporation
(Number average molecular weight 1,000)
・ Naphthenic process oil B2: KN4010 manufactured by PetroChina
(Number average molecular weight 385)

<Olefin C with a softening point of 110°C or higher and 180°C or lower>
・ Olefin C1: Sun Attack M manufactured by Chiba Fine Chemicals
(PP, PP-1 butene, PE-PP, PE mixture (APAO), softening point 123° C., 180° C. melt viscosity 1,300 mPa s, 190° C. melt viscosity 670 mPa s)
・Olefin C2: Aerafin17 made 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)
・Olefin C3: VP828 made by EVONIK
(Propylene-1-butene copolymer (APAO), softening point 161°C, 180°C melt viscosity 3,3000 mPa s, 190°C melt viscosity 25,000 mPa s)
・Olefin C4: EVONIK VP750 (comparative 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)

<Tackifying resin D>
・ Hydrogenated petroleum resin D1: HA-085 manufactured by Tonen General Sekiyu K.K.
(Softening point: 85°C)
・ Hydrogenated petroleum resin D2: HB-103 manufactured by Tonen General Sekiyu K.K.
(Softening point: 100°C)
・ Hydrogenated petroleum resin D3: HB-125 manufactured by Tonen General Sekiyu K.K.
(Softening point: 125°C)

Examples 1-24 and Comparative Examples 1-5
The raw materials described above were put in the blending amounts shown in Tables 1 to 4 into a stirring kneader equipped with a heating device, and heated and kneaded at 145° C. for 90 minutes to produce a hot melt composition.

The properties of the resulting 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 molten 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 Japan Adhesive Industry Association Standard JAI 7.

(Stringiness)
A probe having an adhesion area of 80 mm ² is immersed in an adhesive block formed from the hot melt composition of the present invention by 5 mm at 10 mm/min, and then the probe is lifted by 25 mm at 300 mm/min. The maximum value was taken as the stringing stress measurement value. If the stringing stress is 3.0 N or more, it is judged that the larger the numerical value, the better the insect-catching property.

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

Next, a test piece is obtained by transferring onto a separately prepared cardboard. The coating amount is 300 g/m ² and the coating width is 50 mm. The coated test piece is stored for 24 hours under conditions of 23° C. and 50% relative humidity to cool the hot-melt composition.

Next, the release paper is peeled off, measurement is performed based on the tack test method (rolling ball method) of JIS Z0237, the test piece is placed on a pedestal with an inclination of 30 ° C., and the ball is rolled at an approach distance of 10 cm, Record the maximum size of the ball that stops on the hot melt composition.

(flow resistance)
Using a test piece prepared in the same manner as the ball tack measurement method described above, cut it into a size of 100 mm × 50 mm, and cut the test piece into 90 mm so that the longitudinal direction (coating direction of the hot melt composition) is vertically positioned. It was stored vertically in a constant temperature bath adjusted to ℃, and cured for 12 hours. After 12 hours, it was taken out from the constant temperature bath, and the shape change of the lower surface in the longitudinal direction was evaluated according to the following criteria.

Similarly, the flow resistance was evaluated under conditions of 100° C.×24 hours and 100° C.×48 hours.

If the evaluation is ◯ or higher, it can be evaluated that there is no problem in actual use.
A: 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.
Δ: Deformation of 5 mm or more and less than 10 mm is observed ×: Deformation of 11 mm or more is observed.

(intermittent coatability)
The hot melt composition of the present invention is applied at a coating temperature of 160 ° C. to 180 ° C. at a speed of 5 m / min to a thickness of 50 μm with 1 second coating and 1 second stop (intermittent coating), and the degree of stringing was measured.
◎: Less than 1 cm ○: 1 cm or more to less than 3 cm △: 3 cm or more to less than 5 cm ×: 5 cm or more

If the evaluation is ◯ or higher, it can be evaluated that the intermittent coating property is excellent.

The results are shown in Tables 1-4.

As is clear from the results in Tables 1 to 4, the hot-melt compositions prepared in Examples 1 to 24 satisfying the predetermined requirements had stringing properties (indicators of insect-trapping properties), high-temperature flow resistance, and release liner properties. It can be seen that it has excellent intermittent coating properties, and is particularly suitable for use in forming the adhesive layer of small organism traps. On the other hand, the hot melt compositions prepared in Comparative Examples 1 to 5, which do not satisfy the predetermined requirements, have insufficient stringiness or insufficient flow resistance at high temperatures, especially in Comparative Examples 1 to 4. It can be seen that in No. 5, the intermittent coating property to the release paper is insufficient.

Claims (5)

A hot melt composition containing a butyl rubber A, a liquid plasticizer B, an olefin C having a softening point of 110° C. or higher and 180° C. or lower, and a tackifying resin D,
(1) The content of the liquid plasticizer B is 180 to 550 parts by mass with respect to 100 parts by mass of the butyl rubber A,
(2) the content of the olefin C is 40 to 320 parts by mass with respect to 100 parts by mass of the butyl rubber A;
(3) The content of the tackifying resin D is 10 to 430 parts by mass with respect to 100 parts by mass of the butyl rubber A,
(4) The hot melt composition has a melt viscosity of 9,000 mPa s or less at 180° C. and is used to form an adhesive layer of a small organism trap.
A hot melt composition characterized by: When the mass part of the liquid plasticizer B is B, the mass part of the tackifying resin D is D, and the mass part of the olefin C is C, the ratio represented by (B + D)/C is 2.0 to 20. 2. The hot melt composition of claim 1, wherein the hot melt composition is .0. 3. The hot melt composition according to claim 2, wherein the (B+D)/C ratio is 2.0 to 14.0. The hot melt composition according to any one of claims 1 to 3, wherein the softening point of the olefin C is 120°C or higher and 140°C or lower. The hot melt composition according to any one of claims 1 to 4, wherein the tackifying resin D has a softening point of 90°C or higher.