JPH0154369B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an adhesive, and more specifically, to an adhesive for capturing harmful animals that has excellent adhesiveness and retention and does not flow easily even at high temperatures. [Prior Art and its Problems] Conventionally, adhesive compositions containing polybutene in resin have been known as adhesive compositions for trapping harmful animals such as rats [see Japanese Patent Laid-Open Publication No. 128225/1984, etc.]. However, in the adhesive composition, the polybutene used has a relatively low molecular weight (number average molecular weight
12,000 or less), its adhesiveness and retention properties are poor, and it also has the disadvantage of flowing under high temperatures and exhibiting a sagging phenomenon. For this reason, conventional adhesives of this type have difficulty in reliably capturing harmful animals, especially rats, and become sticky in the summer, so they are still unsatisfactory. This invention was made based on the above circumstances, and an object of the present invention is to provide an adhesive suitable for capturing harmful animals, which has excellent adhesiveness and retention properties, and does not show fluidity at high temperatures. It is. [Means for Solving the Problems] As a result of intensive research by the present inventor to solve the problems described above, high molecular weight polybutenes, especially polybutenes with a number average molecular weight of 10,000 to 20,000, and low molecular weight polybutenes, especially number average molecular weights. The inventors have discovered that the above-mentioned problems can be solved by blending polybutene with a molecular weight of 300 to 3,000 into the resin, and have thus arrived at the present invention. That is, the present invention provides synthetic resin and/or
Alternatively, in an adhesive comprising a natural resin and polybutene, 50 to 500 parts by weight of high molecular weight polybutene having a number average molecular weight of 14,000 to 20,000 and the synthetic resin and /or for 100 parts by weight of natural resin,
The adhesive is characterized by containing 10 to 100 parts by weight of low molecular weight polybutene having a number average molecular weight of 300 to 3,000. What is important about this invention is that by blending high-molecular-weight polybutene and low-molecular-weight polybutene into the resin, a pressure-sensitive adhesive that simultaneously has good adhesion and retention properties and does not show fluidity even at high temperatures can be created. It is possible to obtain the following. In this invention, high molecular weight polybutene usually refers to polybutene with a number average molecular weight of 10,000 or more, and low molecular weight polybutene usually refers to polybutene with a number average molecular weight of less than 10,000. However, the number average molecular weight of the preferable high molecular weight polybutene is 10,000 to 20,000, and the number average molecular weight of the preferable low molecular weight polybutene is 300 to 3,000. If the number average molecular weight of high molecular weight polybutene is less than 10,000, the adhesive will not exhibit good holding power, and if the number average molecular weight is greater than 20,000, the temperature and time during compounding will increase significantly, making processability difficult. may become worse. Also, if the number average molecular weight of the low molecular weight polybutene is less than 300,
A sagging phenomenon will occur at high temperatures, and if the number average molecular weight is greater than 3000, the overall viscosity will increase and good adhesive strength may not be exhibited. The amount of the high molecular weight polybutene is usually 50 to 500 parts by weight, preferably 300 to 500 parts by weight, based on 100 parts by weight of the synthetic resin and/or natural resin, and the amount of the low molecular weight polybutene is ,
Usually 10 to 100 parts by weight, preferably 10 to 100 parts by weight, per 100 parts by weight of synthetic resin and/or natural resin.
It is 40 parts by weight. If the amount of the high molecular weight polybutene is less than 50 parts by weight, even if the amount of the low molecular weight polybutene is within the above range, the retention of the adhesive will decrease, and the amount is more than 500 parts by weight. Even if the amount of low molecular weight polybutene is within the above range, the tackiness of the adhesive may decrease. Furthermore, if the amount of low molecular weight polybutene is less than 10 parts by weight, even if the amount of high molecular weight polybutene is within the above range, the tackiness of the adhesive will decrease; If the amount is more than 1, even if the amount of high molecular weight polybutene is within the above range, the retention of the adhesive may decrease and the fluidity at high temperatures may become too high. Here, the polybutene is 1-butylene,
Cis-2-butylene, trans-2-butylene,
It refers to isobutylene homopolymers and copolymers, and also includes polymer mixtures produced by polymerizing mixtures of the above monomers.
Although a blend of two or more homopolymers obtained by polymerizing each of the above-mentioned various monomers may be used as the polybutene, in this invention, a polymer obtained by polymerizing a mixture of each of the above-mentioned monomers is used. Preference is given to using mixtures. In this case, as the mixture of the various monomers, for example, the residue obtained by extracting butadiene from the C ₄ fraction during the thermal decomposition of naphtha can be suitably used. Then, the polymer mixture is heated to a reaction temperature of 55% using aluminum chloride as a catalyst, for example.
It can be obtained by polymerizing a mixture of the above monomers at a temperature of ~130°C and a pressure of 1 to 22 kg/cm ² G. The molecular weight of the resulting polymer mixture can be determined by adjusting the reaction time and reaction temperature. As the resin in which the high molecular weight polybutene and low molecular weight polybutene are blended, usual synthetic resins or natural resins used as adhesive bases, and mixed resins of synthetic resins and natural resins can be used. Examples of the synthetic resins include aliphatic, aromatic, alicyclic, copolymer, petroleum resins such as coumaron indene resins, phenolic resins such as alkylphenol resins and modified phenolic resins, xylene resins, and modified xylene resins. Resins, polyolefin resins such as polyethylene and polypropylene, and natural resins include gum-based, tall-based, and wood-based rosins, and rosins that are hydrogenated, disproportionated, polymerized, esterified, and converted into metal salts. Examples include rosin derivatives, terpene resins, terpene phenol resins, and the like. In this invention, resins having a softening point of 65 to 110°C, especially polyolefin resins, and especially polypropylene are particularly preferred. The adhesive according to the present invention includes, for example, the resin, high molecular weight polybutene, and low molecular weight polybutene.
It can be obtained by mixing or kneading for 2 to 5 hours at a heating temperature of 100 to 180°C. There are no particular restrictions on the mixing or kneading method. In the present invention, fillers such as zinc oxide, titanium dioxide, calcium carbonate, and silica, antioxidants, and the like may be appropriately blended into the adhesive.
Further, when the adhesive of the present invention is used for capturing harmful animals, if an attractant is added to the adhesive, harmful animals can be captured quickly. This adhesive is used by applying it to a paper board, a wooden board, a metal board, etc., for example. [Effects of the Invention] According to the present invention, since high molecular weight polybutene and low molecular weight polybutene are blended into the synthetic resin and/or natural resin, it has excellent retention and adhesive properties, and does not exhibit fluidity even at high temperatures. , it is possible to provide an adhesive that does not cause the so-called sagging phenomenon.
When this adhesive is used for capturing harmful animals, it is possible to effectively capture harmful animals such as flies, cockroaches, and rats by adhering them. [Examples] Next, the present invention will be explained in more detail by showing examples and comparative examples of the present invention. (Examples 1 to 3) High molecular weight polybutene and low molecular weight polybutene having the number average molecular weights shown in Table 1 were kneaded at 120°C for 3 hours in the blending amounts shown in Table 1. Polypropylene having the number average molecular weight shown in Table 1 was added in the amount shown in Table 1 and kneaded at 170°C for 3 hours to obtain an adhesive. This adhesive was evaluated for tackiness, retention, and fluidity. Note that the high molecular weight polybutene and the low molecular weight polybutene were manufactured as follows. That is, 5 g of aluminum chloride was placed in a 500 ml autoclave, the pressure inside the autoclave was reduced using a vacuum pump, and then 50 g of n-butane was added as a solvent, and the aluminum chloride was dispersed in the solvent by stirring. Then, isobutylene 42
%, 1-butylene 2.18%, and n-butane 40% (the residue obtained by extracting butadiene from the C4 fraction during the thermal decomposition of naphtha) was added over 20 minutes at a heating temperature of 5 _to 80°C. , further 10℃ after addition
(The number average molecular weight of the polybutene used in Examples 1 to 3 was adjusted by adjusting the heating temperature and reaction time.) After the reaction is complete, remove unreacted gas and n-butane, add 300 g of water under ice-cooling to decompose aluminum chloride, and then extract the reaction product in 3 portions with 500 ml of n-hexane. Then, n-hexane was removed from the extract to obtain polybutene. {Adhesive strength} 180° peeling adhesive strength was measured according to JIS Z-0237. The film thickness of the adhesive is 0.3 mm. {Holding force} Measured under a load of 5 kg according to JIS Z-0237. {Fluidity} A 50 x 50 mm paperboard coated with adhesive to a thickness of about 1 mm is hung vertically in an oven at 80°C.
The adhesive was left to stand for 24 hours, and the presence or absence of dripping of the adhesive was visually observed. (Comparative Examples 1 and 2) An adhesive was obtained in the same manner as in the previous example using the polypropylene shown in Table 1 and the low molecular weight polybutene shown in Table 1 without blending high molecular weight polybutene, and the holding power was , adhesive force and fluidity were evaluated.

【table】

[Table] According to Table 1, it can be seen that the adhesives of Examples 1 to 3 are significantly superior to the adhesive of the comparative example in both adhesive strength and holding power, and also have no fluidity at high temperatures. .

Claims (1)

[Scope of Claims] 1. A pressure-sensitive adhesive containing a synthetic resin and/or natural resin and polybutene, including a high molecular weight polybutene having a number average molecular weight of 14,000 to 20,000 based on 100 parts by weight of the synthetic resin and/or natural resin. 50 to 500 parts by weight and 100 parts by weight of the synthetic resin and/or natural resin,
An adhesive characterized by containing 10 to 100 parts by weight of a low molecular weight polybutene having a number average molecular weight of 300 to 3,000.