JP6984889B2 - Hot melt composition - Google Patents

Description

The present invention relates to a hot melt composition which is excellent in ball tackiness, flow resistance and yarn spreading property at room temperature and low temperature environment and can be easily peeled off from a release paper, and particularly provides an adhesive layer for a small organism trap. Concerning hot melt compositions useful for use in forming.

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

In recent years, in order to investigate foreign matter contamination or hygiene in various factories, warehouses, various workplaces, etc., a trap with an adhesive layer on a support such as cardboard or plastic sheet has been installed for a certain period of time. Increasingly, we are investigating the number of pests caught in the area.

As the composition for capturing small organisms used for the above-mentioned applications, various compositions including the following Patent Documents 1 to 3 are known.

Patent Document 1 describes (a) 1 to 10% by mass of polyisobutylene rubber having a viscosity average molecular weight in the range of 1 million to 2.5 million, and (b) 0.1 to 10% by mass of melt flow rate (MFR; 190 ° C./212 kPa load). 20, high-pressure polyethylene 1 to 10% by mass having a density of 0.97 or less and a melting point of 120 ° C. or less as measured by DSC, (c) liquid polybutene having a number average molecular weight in the range of 400 to less than 1200, and ( d) A composition obtained by melt-mixing liquid polybutene having a number average molecular weight in the range of 1200 to 10,000, wherein the total of (c) and (d) is 80 to 98% by mass, (c): (d). ) Is in the range of 1:99 to 10:90 by mass ratio, and a tacky composition for capturing small organisms is disclosed. Further, it is described that the predetermined adhesive composition is excellent in adhesive strength and flow resistance during coating processing.

Patent Document 2 describes (1) 100 parts by weight of a styrene-based thermoplastic elastomer having an ultimate 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 of 300 to 4000 parts. It contains ~ 5,000 softeners and (3) natural or synthetic tackifier resins having a softening point of 60 ° C. or higher in 200 to 3000 parts by weight, and the stress at pushing 15 mm or less at room temperature is 0.15 kg or less. Disclosed is a hot melt pressure-sensitive 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 the predetermined hot melt adhesive composition is excellent in adhesiveness, flow resistance and followability to captured small animals.

Patent Document 3 describes the components (1) to (4);
Component (1): AB-A 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): Adhesive-imparting resin with a softening point of 65 ° C or higher;
Ingredient (3): Adhesive-imparting resin liquid at 25 ° C;
Component (4): Liquid rubber containing liquid polybutene having a number average molecular weight of 200 to 2500 (however, the total blending amount of component (2) and component (3) is 55 parts by weight to 200 parts by weight with respect to 100 parts by weight of component (1). (Weight part)
Is disclosed as an adhesive for capturing small organisms, which comprises the above as an essential component. Further, it is described that the predetermined adhesive for capturing small organisms is excellent in cold flow, peelability from release paper, capture rate and maintenance of capture performance.

Japanese Patent No. 4791821 Japanese Patent No. 5052086 Japanese Patent No. 4215364

However, it is pointed out that there are the following problems when the pressure-sensitive adhesive layer is formed by using the composition or the pressure-sensitive adhesive disclosed in Patent Documents 1 to 3 and used for capturing small organisms.

For example, since the adhesive composition of Patent Document 1 uses high-density polyethylene to satisfy the flow resistance of the adhesive layer, there is a high possibility that the capture performance in a low temperature environment will be significantly reduced.

The hot melt adhesive composition of Patent Document 2 has a melt viscosity that can be applied with a slot coater, and contains a large amount of a liquid softener in order to satisfy the flow resistance and the yarn spreading property of the composition. Therefore, it is highly possible that it will be difficult to peel off from the release paper.

Since Patent Document 3 uses an AB-A type styrene-diene block copolymer that can be peeled off from a release paper and satisfies flow resistance, the capture performance in a low temperature environment is significantly reduced. There is a high possibility that the yarn drawability will deteriorate.

Further, as a problem related to Patent Document 1, since the polyisobutylene contained in the conventionally used polyisobutylene-based pressure-sensitive adhesive is a very high polymer, it is used as a pressure-sensitive adhesive in order to improve the coating suitability. It has been pointed out that the content of the liquid plasticizer contained becomes large, and as a result, the flow resistance tends to be inferior.

As described above, it is excellent in adhesiveness, flow resistance and yarn spreading property in normal temperature and low temperature environments, and can be easily peeled off from the release paper, and is particularly suitable for the application of forming an adhesive layer of a small organism trap. The hot melt composition has not yet been developed.

Therefore, the present invention is excellent in ball tack resistance, flow resistance and yarn spreading property in normal temperature and low temperature environments, and can be easily peeled off from release paper, and is particularly used for forming an adhesive layer of a small organism trap. It is an object of the present invention to provide a suitable hot melt composition.

As a result of diligent research to solve the above problems, the present inventor has found that a specific hot melt composition containing butyl rubber, liquid polybutene, a liquid plasticizer and a tackifier resin in a predetermined ratio can achieve the above object. The invention was completed.

That is, the present invention relates to the following hot melt composition.
1. 1. Contains butyl rubber A, liquid polybutene B, liquid plasticizer C and tackifier resin D,
(1) The content of the liquid polybutene B is 100 to 300 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(2) The content of the liquid plasticizer C is 50 to 100 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(3) The content of the tackifier resin D is 200 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(4) The softening point temperature is 60 to 80 ° C.
A hot melt composition characterized by that.
2. 2. Item 2. The hot melt composition according to Item 1, wherein the butyl rubber A has a weight average molecular weight of 300,000 to 700,000.
3. 3. Item 2. The hot melt composition according to Item 1 or 2, wherein the liquid polybutene has a number average molecular weight of 900 to 2100.
4. ^{Item 2.} The hot melt composition according to any one of Items 1 to 3, wherein the liquid plasticizer C has a 40 ° C. kinematic viscosity of 30 to 110 mm 2 / s.
5. Item 2. The hot melt composition according to any one of Items 1 to 4, wherein the tackifier resin D has a softening point of 80 ° C. or higher.
6. Item 2. The hot melt composition according to any one of Items 1 to 5, wherein the total content of the liquid polybutene B and the liquid plasticizer C is 150 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A.
7. The hot melt composition according to any one of Items 1 to 6 above, wherein the melt viscosity at 180 ° C. is 30,000 mPa · s or less.
8. The hot melt composition according to any one of Items 1 to 7, which has a ball tack of 20 to 32 in an environment of 23 ° C.
9. The hot melt composition according to any one of Items 1 to 8 above, wherein the ball tack in an environment of 10 ° C. is 20 to 28.
10. Item 6. The hot melt composition according to any one of Items 1 to 9, which is used for forming an adhesive layer of a small organism trap.

The hot melt composition of the present invention contains butyl rubber, liquid polybutene, a liquid plasticizer, and a tackifier resin in a predetermined ratio, and thus has excellent ball tackiness, flow resistance, and yarn spreading property in normal temperature and low temperature environments. It is also easy to peel off from the release paper, and is particularly suitable for applications that form an adhesive layer for small organism traps.

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

The hot melt composition of the present invention contains butyl rubber A, liquid polybutene B, liquid plasticizer C, and tackifier resin D.
(1) The content of the liquid polybutene B is 100 to 300 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(2) The content of the liquid plasticizer C is 50 to 100 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(3) The content of the tackifier resin D is 200 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(4) The softening point temperature is 60 to 80 ° C.
It is characterized by that.

The hot melt composition of the present invention having the above-mentioned characteristics contains butyl rubber, liquid polybutene, a liquid plasticizer and a tackifier resin in a predetermined ratio, so that the hot melt composition has ball tackiness, flow resistance and spreadability at room temperature and low temperature environment. It has excellent threadability and can be easily peeled off from release paper, and is particularly suitable for applications that form an adhesive layer for small organism traps.

In addition, "excellent in ball tackiness in normal temperature and low temperature environments" means that the hot melt composition of the present invention and the adhesive layer formed from the hot melt composition have adhesiveness suitable for capturing small organisms in normal temperature and low temperature environments. Means that. “Excellent in flow resistance” means that the adhesive layer does not change its shape even when heated. "Excellent in yarn spreading property" means that the composition and the adhesive layer have excellent yarn spreading property (capturing by entwining small organisms with thread spreading). Further, "easily peeling from the release paper" means that when the release paper is provided on the adhesive layer, the adhesive layer can be easily peeled from the release paper without stringing before use.

Butyl rubber A
The hot melt composition of the present invention contains butyl rubber A. Butyl rubber A imparts adhesive strength and yarn spreading property of the hot melt composition. 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 regenerated butyl rubber and synthetic butyl rubber. The weight average molecular weight of the butyl rubber A is not limited, but is preferably 300,000 to 700,000, more preferably 400,000 to 600,000 from the viewpoint of the viscosity of the hot melt composition. The weight average molecular weight in the present 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, with the following measuring device and measuring conditions.
Measuring device: Waters product name "ACQUITY APC"
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 Refractometer (RI) Detector Standard Material: Polystyrene (Molecular Weight: 266 to 1,800,000, manufactured by Waters)
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, a commercially available product can be used. Examples of commercially available products include "Butyl Rubber 065" manufactured by JSR Corporation and "Butyl Rubber 268" manufactured by JSR Corporation.

Compared with the conventional styrene-based thermoplastic elastomer, butyl rubber A does not have a hard segment like a styrene block, so that a decrease in cohesive force can be expected, which results in good yarn spreading property of the hot melt composition. It becomes.

Liquid polybutene B
The hot melt composition of the present invention contains liquid polybutene B. The above-mentioned "liquid" means that it has fluidity at 25 ° C. (that is, it changes its shape according to the container when it is put in a container). The liquid polybutene B is not particularly limited, and examples thereof include homopolymers of isobutene, copolymers of isobutene and n-butene, and the like.

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

As the liquid polybutene B, a commercially available product can be used. Examples of commercially available products include "Nisseki Polybutene" manufactured by Nippon Petrochemicals and "Tetrax" manufactured by Nippon Petrochemicals.

The number average molecular weight of the liquid polybutene B is not limited, but is preferably 900 to 2100, more preferably 1000 to 1800. When the number average molecular weight of the liquid polybutene is 900 or more, the ball tack performance of the hot melt composition in a low temperature environment is improved, and the composition has good flow resistance. Further, when the number average molecular weight of the liquid polybutene is 2100 or less, the hot melt composition can be suitably coated with a slot coater. The number average molecular weight in the present specification is a value measured according to ASTM D 3536.

The content of the liquid polybutene B may be 100 to 300 parts by mass with respect to 100 parts by mass of the butyl rubber A, and 150 to 250 parts by mass is particularly preferable. When the content of the liquid polybutene B is 100 parts by mass or more, the ball tack performance of the hot melt composition in a low temperature environment is improved. Further, when the content of the liquid polybutene B is 300 parts by mass or less, the flow resistance of the hot melt composition is improved.

Liquid plasticizer C
The hot melt composition of the present invention contains a liquid plasticizer C. The above-mentioned "liquid" means that it has fluidity at 25 ° C. (that is, it changes its shape according to the container when it is put in a container). The liquid plasticizer C is not particularly limited, and examples thereof include paraffin-based process oils, naphthen-based process oils, aromatic process oils, liquid paraffins, and hydrocarbon-based synthetic oils. Among these liquid plasticizers C, process oil is preferable, paraffin-based process oil and at least one of naphthen-based process oil are more preferable, and paraffin-based process oil is particularly preferable.

The liquid plasticizer C can be used alone or in combination of two or more.

As the paraffin-based process oil, a commercially available product can be used. Examples of commercially available products include "PW-32" manufactured by Idemitsu Kosan Co., Ltd., "Diana Fresia S32" manufactured by Idemitsu Kosan Co., Ltd., and "PS-32" manufactured by Idemitsu Kosan Co., Ltd.

As the naphthenic process oil, a commercially available product can be used. Examples of commercially available products include "Diana Fresia N28" manufactured by Idemitsu Kosan Co., Ltd., "Diana Fresia U46" manufactured by Idemitsu Kosan Co., Ltd., and "Diana Process Oil NR" manufactured by Idemitsu Kosan Co., Ltd.

As the aromatic process oil, a commercially available product can be used. Examples of commercially available products include "Aromax" manufactured by Nippon Oil Co., Ltd.

As the liquid paraffin, a commercially available product can be used. Examples of commercially available products include "P-100" manufactured by MORESCO, "Kaydol" manufactured by Sonneborn, and the like.

As the hydrocarbon-based synthetic oil, a commercially available product can be used. Examples of commercially available products include "Lucant HC-10" manufactured by Mitsui Chemicals, Inc., "Lucant HC-20" manufactured by Mitsui Chemicals, and the like.

The content of the liquid plasticizer C may be 50 to 100 parts by mass with respect to 100 parts by mass of the butyl rubber A, and 60 to 90 parts by mass is particularly preferable. When the content of the liquid plasticizer C is 50 parts by mass or more, the ball tack performance of the hot melt composition in a low temperature environment is improved. Further, when the content of the liquid plasticizer C is 100 parts by mass or less, the release property of the release paper from the adhesive layer made of the hot melt composition is improved.

Further, the total content of the liquid polybutene B and the liquid plasticizer C is not limited, but from the viewpoint of the melt viscosity and the flow resistance of the hot melt composition, 150 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A. Of these, 200 to 350 parts by mass is particularly preferable.

40 ° C. The kinematic viscosity of the liquid plasticizer C is not critical but is preferably ^{30~110mm 2 / s, 30~95mm 2 /} s is more preferable. When the 40 ° C. kinematic viscosity of the liquid plasticizer C is 30 mm ² / s or more, the flow resistance and the yarn drawability are improved. Further, when the 40 ° C. kinematic viscosity of the liquid plasticizer C is 110 mm ² / s or less, the ball tack in a low temperature environment is improved. The 40 ° C. kinematic viscosity in the present specification is a value measured according to JIS K2283.

Adhesive-imparting resin D
The hot melt composition of the present invention contains a tackifier resin D. The tackifier 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, and pentaerythritol ester of modified rosin.

Examples of the terpene-based compound include a copolymer of natural terpene, a three-dimensional polymer of natural terpene, a hydrogenated derivative of a copolymer of natural terpene, a terpene resin, and a hydrogenated derivative of a phenol-based modified terpene resin.

Examples of the petroleum resin include petroleum resins such as C5 petroleum resin, C9 petroleum resin, C5C9 petroleum resin, and dicyclopentadiene petroleum resin. Further, hydrogenated petroleum resin (partially hydrogenated petroleum resin, fully hydrogenated petroleum resin) to which these petroleum resins are hydrogenated can also be mentioned. Among the hydrogenated petroleum resins, the partially hydrogenated petroleum resin is more preferable in that it has high compatibility with the butyl rubber A and is excellent in heating stability. The C5 series petroleum resin is a petroleum resin made from the C5 fraction of petroleum, the C9 series petroleum resin is a petroleum resin made from the C9 fraction of petroleum, and the C5 C9 series petroleum resin is 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, pentane and the like. Examples of the C9 fraction include styrene, vinyltoluene, indene and the like. As the C5 type petroleum resin and the C5C9 type petroleum resin, those containing dicyclopentadiene (DCPD) derived from cyclopentadiene, which is a kind of C5 fraction, in the skeleton are preferable.

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

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

The softening point temperature of the tackifier resin D is not limited, but is preferably 80 ° C. or higher, more preferably 100 ° C. or higher. When the softening point of the tackifier resin D is 80 ° C. or higher, the hot melt composition of the present invention can exhibit better flow resistance. The ring-shaped softening point temperature in the present specification is a value measured in accordance with JIS K2207.

The content of the tackifier resin D may be 200 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A, and 250 to 350 parts by mass is particularly preferable. When the content of the tackifier resin D is 200 parts by mass or more, the hot melt composition of the present invention can exhibit good release property from a release paper. Further, when the content of the tackifier resin D is 400 parts by mass or less, the hot melt composition of the present invention can exhibit good yarn spreading property.

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

As the tackifier resin D, a commercially available product can be used. Commercially available products include, for example, TonenGeneral Sekiyu Co., Ltd. "HA-103", Arakawa Chemical Co., Ltd. "Alcon M-100", Idemitsu Kosan Co., Ltd. "Imarb P100", Kolon Co., Ltd. "Scorets SU400", and Yasuhara Chemical Co., Ltd. " YS resin TO-105 "and the like.

Other Additives The hot melt composition of the present invention may contain other additives as long as it does not essentially interfere with the object of the present invention. For example, antioxidants, ultraviolet absorbers and the like can be mentioned.

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- (3,3) 5-Di-t-butyl-4-hydroxyphenyl) propionate] Hindered phenolic antioxidants such as methane; dilaurylthiodipropionate, laurylstearylthiodipropionate, pentaerythritol tetrakis (3-laurylthiopropionate) Sulfur-based antioxidants such as Nate); phosphorus-based antioxidants such as tris (nonylphenyl) phosphite and tris (2,4-di-t-butylphenyl) phosphite can be mentioned.

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

Examples of the ultraviolet absorber include 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-t-butylphenyl) benzotriazole, 2- (2'). -Hydroxy-3', 5'-di-t-butylphenyl) -benzotriazole-based ultraviolet absorbers such as 5-chlorobenzotriazole; benzophenone-based ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone; salicylic acid ester-based Examples thereof include an ultraviolet absorber; a cyanoacrylate-based ultraviolet absorber; and a hindered amine-based light stabilizer.

The ultraviolet absorber may 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 with respect to 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 imparted with excellent thermal stability and coating suitability, and the hot melt composition of the present invention is desired. Performance can be imparted.

Physical Properties of Hot Melt Composition The "melt viscosity" in the present specification is the viscosity of the hot melt composition that has been heated and melted at a constant temperature. For example, 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 type viscometer (spindle No. 29).

The hot melt composition of the present invention preferably has a melt viscosity at 180 ° C. of 30,000 mPa · s or less. If the melt viscosity at 180 ° C. exceeds 30,000 mPa · s, the coating suitability of the hot melt composition of the present invention may decrease. The melt viscosity at 180 ° C. is preferably 5,000 to 20,000 mPa · s, more preferably 9,000 to 15,000 mPa · s. By setting the melt viscosity at 180 ° C. in the above range, the coating suitability of the hot melt composition of the present invention is further improved.

In the present specification, the "softening point" 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 80 ° C. Within this range, the effects of capture performance and flow resistance in a low temperature environment can be obtained.

The “ball tack” in the present specification is a value that can be measured based on the tack test method (rolling method) of JIS Z0237.

The hot melt composition of the present invention preferably has a ball tack of 20 to 32 in an environment of 23 ° C., more preferably 24 to 32. Since it is within the range where the ball tack is applied, it is excellent in the ability to capture small organisms at room temperature.

Further, the hot melt composition of the present invention preferably has a ball tack of 20 to 28 in an environment of 10 ° C., more preferably 24 to 28. Since it is within the range where the ball tack is applied, it is excellent in the ability to capture small organisms even in a low temperature environment.

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

Hereinafter, examples of the present invention will be described. The present 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: JSR Butyl Rubber 065
(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)
-Styrene-isoprene-styrene copolymer A4: Clayton D1161
(Weight average molecular weight 210,000)
<Liquid polybutene B>
・ Liquid polybutene B1: Indopole H-300 manufactured by Ineos Co., Ltd.
(Number average molecular weight 1300)
-Liquid polybutene B2: Indopole H-100 manufactured by Ineos Co., Ltd.
(Number average molecular weight 910)
-Liquid polybutene B3: Ineos Indopole H-1200
(Number average molecular weight 2100)
-Liquid polybutene B4: Ineos Indopole H-2100
(Number average molecular weight: 2500)
<Liquid plasticizer C>
・ Paraffin-based process oil C1: PS-32 manufactured by Idemitsu Kosan Co., Ltd.
(40 ° C. kinematic viscosity: 31.4 mm ² / s)
・ Paraffin-based process oil C2: PS-90 manufactured by Idemitsu Kosan Co., Ltd.
(40 ° C. kinematic viscosity: 92.4 mm ² / s)
・ Naphthenic process oil C3: N-90 manufactured by Idemitsu Kosan Co., Ltd.
(40 ° C. kinematic viscosity: 108.5 mm ² / s)
<Adhesive-imparting resin D>
・ Hydrogenated petroleum resin D1: Arkon P-125 manufactured by Arakawa Chemical Industry Co., Ltd.
(Softening point: 125 ° C)
・ Hydrogenated petroleum resin D2: Arkon P-140 manufactured by Arakawa Chemical Industry Co., Ltd.
(Softening point: 140 ° C)
・ Hydrogenated petroleum resin D3: HB-103 manufactured by TonenGeneral Sekiyu Co., Ltd.
(Softening point: 100 ° C)
・ Hydrogenated petroleum resin D4: HA-085 manufactured by TonenGeneral Sekiyu Co., Ltd.
(Softening point: 80 ° C)
-Rosin ester derivative D5: Manufacturer confirmed KOMOTAC KF-454S
(Softening point: 104 ° C)
<Antioxidant>
-Phenolic antioxidant: IRGANOX1010 manufactured by BASF
Examples 1-18 and Comparative Examples 1-7
The above-mentioned raw materials were put into a stirring and kneading machine equipped with a heating device in the blending amounts shown in Tables 1 and 2, respectively, and heated and kneaded at 145 ° C. for 90 minutes to produce a hot melt composition.

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

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

Then, it is transferred to a separately prepared cardboard to make a test piece. The coating amount is 350 g / m ² , and the coating width is 50 mm. The test piece coated at this time is stored for 24 hours under the condition of 23 ° C. and a relative humidity of 50%, and the hot melt composition is cooled.

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

(Threading property)
Using a test piece prepared in the same manner as the ball tack measurement method described above, cut it into a size of 50 mm × 50 mm, attach it to a T-shaped jig using SUS304 with double-sided tape, and attach it to the lower side of the tensile tester. Fix it to the fixing jig. A circular jig having a diameter of 13 mm is fixed to the upper fixing jig in parallel with the circular surface and the hot melt composition. The distance between jigs is set to 120 mm, compression is performed by 120 mm at a compression rate of 300 mm / min in the compression direction, and the hot melt composition and the circular jig are brought into contact with each other. After contact, hold for 10 seconds and pull at a tensile speed of 50 mm / min.

At this time, since the hot melt composition extends linearly between the hot melt composition and the circular jig, the evaluation was made according to the following criteria according to the extended distance. If the evaluation is Δ or higher, it can be evaluated that there is no problem in actual use.
⊚: The hot melt composition extends linearly by 50 mm or more.
◯: The hot melt composition extends linearly in the range of 20 mm or more and less than 50 mm.
Δ: The hot melt composition extends linearly in the range of 10 mm or more and less than 20 mm.
X: The hot melt composition extends linearly in the range of less than 10 mm.

(Release of release paper)
Using a test piece prepared in the same manner as the above-mentioned ball tack measurement method, cut into a size of 50 mm × 50 mm and perform a T-type release test under the condition of a tensile speed of 300 mm / min to improve the release property of the release paper. Evaluation was made according to the following criteria.

If the evaluation is Δ or higher, it can be evaluated that there is no problem in actual use.
⊚: Can be peeled from the hot melt composition without pulling any thread.
◯: Although it can be peeled off, the hot melt composition draws about 10 threads.
Δ: Although it can be peeled off, about 25 threads of the hot melt composition are drawn.
X: The release paper does not peel off from the hot melt composition, and the coated surface is deformed.

(Flow resistance)
Using a test piece prepared in the same manner as the above-mentioned ball tack measurement method, cut into a size of 100 mm × 50 mm, and set the test piece 45 so that the longitudinal direction (coating direction of the hot melt composition) is positioned vertically. It was stored upright in a constant temperature bath adjusted to ° C and cured for 48 hours. After 48 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.

If the evaluation is Δ or higher, it can be evaluated that there is no problem in actual use.
⊚: No deformation is seen.
◯: Deformation of 1 mm or more and less than 2 mm is observed.
Δ: Deformation of 2 mm or more and less than 5 mm is observed.
X: Deformation of 5 mm or more is observed.

The results are shown in Tables 1 and 2.

As is clear from the results shown in Tables 1 and 2, the hot melt composition of the present invention prepared in Examples 1 to 18 contains butyl rubber, liquid polybutene, a liquid plasticizer and a tackifier resin in a predetermined ratio. Therefore, it has excellent ball tackiness, flow resistance and yarn spreading property in normal temperature and low temperature environments, is easy to peel off from release paper, and is suitable for use in forming an adhesive layer for small organism traps. I understand.

Claims (10)

Contains butyl rubber A, liquid polybutene B, liquid plasticizer C and tackifier resin D,
(1) The content of the liquid polybutene B is 100 to 300 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(2) The content of the liquid plasticizer C is 50 to 100 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(3) The content of the tackifier resin D is 200 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A.
(4) The softening point temperature is 60 to 80 ° C.
A hot melt composition characterized by that. The hot melt composition according to claim 1, wherein the butyl rubber A has a weight average molecular weight of 300,000 to 700,000. The hot melt composition according to claim 1 or 2, wherein the liquid polybutene has a number average molecular weight of 900 to 2,100. The hot melt composition according to any one of claims 1 to 3, wherein the liquid plasticizer C has a 40 ° C. kinematic viscosity of 30 to 110 mm ^{2 / s.} The hot melt composition according to any one of claims 1 to 4, wherein the tackifier resin D has a softening point of 80 ° C. or higher. The hot melt composition according to any one of claims 1 to 5, wherein the total content of the liquid polybutene B and the liquid plasticizer C is 150 to 400 parts by mass with respect to 100 parts by mass of the butyl rubber A. The hot melt composition according to any one of claims 1 to 6, wherein the melt viscosity at 180 ° C. is 30,000 mPa · s or less. The hot melt composition according to any one of claims 1 to 7, wherein the ball tack in a 23 ° C environment is 20 to 32. The hot melt composition according to any one of claims 1 to 8, wherein the ball tack in a 10 ° C. environment is 20 to 28. The hot melt composition according to any one of claims 1 to 9, which is used for forming an adhesive layer of a small organism trap.