JPH0737598B2 - Adhesive composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pressure-sensitive adhesive composition, and more specifically, it is applied to a sheet-like material such as cardboard, cardboard, plastic, rubber, etc., and harmful pests such as flies, cockroaches, The present invention provides a pressure-sensitive adhesive composition suitable for capturing a mouse or the like, which has excellent adhesive performance and is for use in capturing harmful small organisms.

(Prior Art) Not only damage to agricultural products and stored foods caused by harmful small organisms, especially mice, but also economic damage due to damage to houses, gas pipes, electric wires, communication cables, etc. is immeasurable. On the other hand, extermination of flies, cockroaches, rats, etc. is an essential issue in terms of environmental hygiene. Although several methods for exterminating these harmful pests have been proposed and implemented, the simplest method is to apply an adhesive or an adhesive composition to a sheet-shaped base material such as cardboard, cardboard, plastic, and rubber. There is a method of installing the applied material in the path of these pests and capturing it.

As such an adhesive composition, those containing polybutene, polyolefin, rubber and the like are conventionally known (JP-A-57-183701, JP-A-59-80601 and JP-A-62-241937). ing. However, these adhesive compositions have low adhesive properties necessary for capturing small organisms, have large changes in adhesive properties due to ambient temperature, and have a problem of storage due to sagging phenomenon due to fluidization in summer. It has been pointed out. It is also known that the workability is poor in the kneading step of this composition and the step of applying it to the base sheet because the viscosity of these compositions is relatively high, and the production cost of the pressure-sensitive adhesive is high with expensive raw materials. Has the drawback that

(Problems to be Solved by the Invention) An object of the present invention is to provide an adhesive composition having excellent adhesive properties, shape stability under high temperature (prevention of sagging), and improved workability in the manufacturing process. Furthermore, it is an object of the present invention to provide an inexpensive pressure-sensitive adhesive composition.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have
Substitute for low molecular weight polybutene which has been used as a base for pressure-sensitive adhesive composition, based on liquid hydrocarbon resin containing C5 diolefin or monoolefin and / or hydrogenated liquid hydrocarbon resin as a base. By using this and blending a polyolefin or / and an elastomer and a thixotropic agent in an appropriate ratio, a pressure-sensitive adhesive composition having excellent pressure-sensitive adhesive properties and shape stability at high temperatures was found.

That is, the present invention contains a liquid hydrocarbon resin or / and a hydrogenated liquid hydrocarbon resin containing a C5 diolefin and a monoolefin as a main component as a base, a polyolefin or / and an elastomer, and a thixotropic agent. An adhesive composition is provided.

The liquid hydrocarbon resin and / or hydrogenated liquid hydrocarbon resin containing 5 or less diolefins and monoolefins as main components used in the present invention is a by-product having a boiling range of -10 to 100 ° C during petroleum refining or naphtha decomposition. A liquid hydrocarbon resin obtained by cationically polymerizing a hydrocarbon fraction containing a C5 diolefin and a monoolefin obtained from oil with a Friedel-Crafts catalyst according to a conventional method, and Ni and Pd according to a conventional method. Is a hydrogenated liquid hydrocarbon resin hydrogenated with a metal or metal oxide such as Pt as a catalyst.

In addition, when a hydrogenated liquid hydrocarbon resin having almost no unsaturated bond in the molecular structure is used, a pressure-sensitive adhesive composition which is remarkably excellent in odor and weather resistance can be obtained.

Liquid hydrocarbon resins and hydrogenated liquid hydrocarbon resins with a softening point (ring and ball method) of 30 ° C or less and a viscosity of 50 to 5,000 cSt / 50 ° C are preferable. It is not preferable because the characteristics are hard to be expressed.

Examples of the C 5 diolefin include piperylene, isoprene, cyclopentadiene and the like, and examples of the C 5 monoolefin include 2-methyl-1-butene, 2-methyl-2-butene, 1-pentene, Examples include 2-pentene and cyclopentene. Further, as a raw material of the liquid hydrocarbon resin or / and the hydrogenated liquid hydrocarbon resin in the present invention, an aromatic monoolefin or a diolefin other than 5 carbon atoms to the extent that the compatibility with the polyolefin or / and the elastomer is not deteriorated. ,
It does not hinder the addition of a third component such as a mono-olefin.

As the Friedel-Crafts catalyst, generally, boron trifluoride or aluminum chloride is used alone or a complex compound thereof with an organic compound containing oxygen, nitrogen or sulfur is used.

The polyolefin may have any molecular structure as long as it has compatibility with the liquid hydrocarbon resin and / or the hydrogenated liquid hydrocarbon resin, such as polyethylene, polypropylene, polybutene, and ethylene-propylene-butene copolymer. Etc., especially number average molecular weight 2,000-20
Those of 0,000 are preferred.

As the elastomer, natural rubber, polybutadiene, low molecular weight polyisobutylene, polyisoprene, butyl rubber,
Examples thereof include elastomers such as ethylene-propylene rubber and styrene-butadiene rubber, and other polyolefin thermoplastic elastomers and styrene thermoplastic elastomers. These may be used alone or in combination. However, in order to be used for capturing the harmful small organisms that are sensitive to odor and color, those that are colorless and odorless are preferable, and those that have weather resistance that can withstand long-term environmental exposure are preferable.

In particular, polyolefins and elastomers having a softening point of 80 to 160 ° C have excellent workability in the production of the pressure-sensitive adhesive composition and the step of applying to the sheet base material because the viscosity sharply decreases at a temperature above this softening point. Most preferred.

Finely powdered silica, organic bentonite, hydrogenated castor oil and their derivatives are most often used as thixotropic agents, but the adhesive sagging phenomenon occurs at least in the environment of at least 50 ° C, assuming the shelf life of adhesive sheets in the summer. It is desirable to select one that does not cause

The compounding amounts of the respective components in the pressure-sensitive adhesive composition of the present invention will be described in more detail. (A) Liquid hydrocarbon resin containing C5 diolefin or monoolefin as a main component and / or hydrogenated liquid hydrocarbon resin (B) for 100 parts by weight
It is preferable that the amount of the polyolefin or / and the elastomer is 5 to 100 parts by weight and the (C) thixotropic agent is 0.5 to 6 parts by weight, but the pressure-sensitive adhesive composition of the present invention can be modified as necessary, for example, solid at room temperature. Tackifying resin, antioxidant,
An attractant for pests and the like can also be added as appropriate.

When 100 parts by weight of liquid hydrocarbon resin or / and hydrogenated liquid hydrocarbon resin is mixed with 5 parts by weight or less of polyolefin or / and elastomer, the pressure-sensitive adhesive becomes soft and cohesive property is remarkably reduced, causing sagging phenomenon or trapping. There is a problem that the harmful pests escaped again. On the other hand, if the amount is 100 parts by weight or more, the pressure-sensitive adhesive becomes hard, which makes it difficult to apply it to the capture sheet, and the adhesive performance is significantly reduced, making it difficult to capture harmful small organisms.

If the blending amount of the thixotropic agent is 0.5 parts by weight or less, it is difficult to stop the sagging phenomenon at 50 ° C, while if it is 6 parts by weight or more, the viscosity of the pressure-sensitive adhesive increases remarkably and the sagging property almost disappears. Is improved, but it is not preferable because it lowers the adhesive performance.

The viscosity of the pressure-sensitive adhesive composition of the present invention having such a component varies depending on whether one of the blending components is a polyolefin or an elastomer, and when blending a polyolefin, 1,000 to 10,000 centipoise / 100 ° C. is preferable, while , 1,000-100,0 when blended with elastomer
00 centipoise / 100 ° C is preferred.

The characteristics of the pressure-sensitive adhesive were evaluated with respect to shear adhesive strength, holding power, sag and viscosity, and the method is as follows.

For shear adhesive strength, apply a pressure-sensitive adhesive to one side of a 50 μm-thick polyester film to a glue thickness of 200 μm, bond the other polyester film, and cut out so that the adhesion area becomes 25 mm × 25 mm to obtain a test piece. Temperature 23 ℃, humidity 65%
The maximum load is obtained when the test piece is pulled at a speed of 50 mm / min by a tensile tester in a constant temperature and humidity chamber adjusted to.
Holding power is 20 ° C and 65% humidity in a constant temperature and humidity chamber. Fix one end of the test piece prepared by the same method as the shear adhesive force, apply a load of 50 g to the other end, until the load falls. Ask for time.

As for the sagging property, a glass petri dish having a diameter of 50 mm and a depth of 10 mm is filled with an adhesive up to the upper end, and is vertically placed in a constant temperature bath at 50 ° C., and the sagging phenomenon after 24 hours is visually observed.

The viscosity is measured with a B-type viscometer at a predetermined temperature.

(Advantages of the Invention) The pressure-sensitive adhesive composition of the present invention has excellent adhesiveness and holding power as compared with the conventional pressure-sensitive adhesive composition, and not only exhibits excellent performance for capturing harmful small organisms such as rats but also has a small harmful effect. It has a comprehensive balance of shape stability and odorlessness, which are indispensable as an adhesive for capturing organisms. Furthermore, when a hydrogenated liquid hydrocarbon resin is used as a base, a pressure-sensitive adhesive composition excellent in weather resistance can be obtained.

In addition, diolefins having 5 carbon atoms and liquid hydrocarbon resins containing olefins as main components and / or hydrogenated liquid hydrocarbon resins have excellent compatibility with various polyolefins and / or elastomers, and therefore have low adhesive composition properties. It is possible to increase the viscosity and facilitate the work in the production of pressure-sensitive adhesives and the step of applying to pressure-sensitive adhesive sheets, and to provide a low-cost pressure-sensitive adhesive composition as compared to the base polybutene conventionally used for this application. To do.

(Example) Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

Examples 1 to 5 and Comparative Examples 1 to 3 Taking predetermined amounts of the components of the pressure-sensitive adhesive composition shown in Table 1, respectively,
First, put polyolefin or elastomer and antioxidant in a lab kneader set at a temperature of 140 ° C, and then gradually add liquid hydrocarbon resin or hydrogenated liquid hydrocarbon resin in which thixotropic agent and antioxidant are mixed in advance. While kneading, the pressure sensitive adhesive composition was manufactured. In Examples 1 and 3 and Comparative Example 1 in which butyl rubber was used as an elastomer, a kneading time of 5 minutes was required, and in others, 40 minutes was required.

Table 1 also shows the results of evaluation of viscosity, shear adhesive strength, holding power and sagging phenomenon for each pressure-sensitive adhesive composition. From the numerical values in the table, the pressure-sensitive adhesive composition of the present invention is comprehensively superior. It's clear.

Claims (5)

[Claims] 1. A liquid hydrocarbon resin or a hydrogenated liquid hydrocarbon resin containing (A) a diolefin having 5 carbon atoms and a monoolefin as a main component, (B) a polyolefin or / and an elastomer, and (C) a thixotropic resin. A pressure-sensitive adhesive composition containing an agent. 2. (A) 100 parts by weight of a liquid hydrocarbon resin or / and a hydrogenated liquid hydrocarbon resin containing a C 5 diolefin and a monoolefin as a main component, (B) 5 to 100 parts by weight of a polyolefin, and C) The pressure-sensitive adhesive composition according to claim 1, which comprises 0.5 to 6 parts by weight of a thixotropic agent and has a viscosity of 1,000 to 10,000 centipoise / 100 ° C. 3. The polyolefin has a number average molecular weight of 2,000.
The pressure-sensitive adhesive composition according to claim 2, which is 0 to 200,000. 4. (A) 100 parts by weight of a liquid hydrocarbon resin or / and a hydrogenated liquid hydrocarbon resin containing C 5 diolefins and monoolefins as main components, (B) 5 to 100 parts by weight of an elastomer, and C) The pressure-sensitive adhesive composition according to claim 1, which comprises 0.5 to 6 parts by weight of a thixotropic agent and has a viscosity of 1,000 to 100,000 centipoise / 100 ° C. 5. The softening point (ring and ball method) of the liquid hydrocarbon resin or the hydrogenated liquid hydrocarbon resin is 30 ° C. or less, and the viscosity is 50 to 5,000 cSt / 50 ° C. 1
The pressure-sensitive adhesive composition described in 1.