JP2002105247A - Base material and master batch for thermal expansion micro balloon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a master batch for weight reduction of a rubber. SOLUTION: A substance comprising a non-polarized cyclic molecule having many double bonds and forming cross-links at vulcanization of a rubber, specifically a certain trans-polyoctenemer rubber, is used as a dispersing agent for encapsulating a micro balloon blowing agent, and easily and uniformly dispersing it in a matrix (to be dispersed) rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing rubber weight, and more particularly, to a base material and a master batch for a thermal expansion type microballoon.

[0002]

2. Description of the Related Art In each field, weight reduction or further weight reduction is required from the viewpoints of material cost reduction, better ease of use and ease of use, as well as the preservation of the global environment and re-recognition of finite resources. It is an important issue.

[0003] This is the same in the field of rubber.

In order to reduce the weight in the field of rubber, there is a method of improving the mechanical and physical strengths such as tensile strength, tear strength and abrasion resistance, so-called rubber physical properties, and reducing the size of the rubber product itself. In addition, there is a direction and a method of reducing the density of the material itself.

By the way, depending on the use of a product, it is important to reduce the density. In particular,
The thickness of the product is important when the bending strength or the deflection of the product is limited. Even when heat insulation and vibration absorption are required, the thickness of the product is important. In addition to the mechanical or pure technical properties of rubber, there are many cases where thickness is important in practical use.

[0006] For example, when used on the soles of shoes, there is a practical demand that there is no burden on the knees of elderly people or marathon runners, and that there is no obstacle to walking even if there is some puddle on the road. However, it is necessary to have a certain thickness in order to satisfy the hobby demands, such as to meet as much as possible the desire of the wearer to look tall. However, if the thickness is too thick, the shoes will be heavy and the comfort will be poor.

[0007] In addition, there are applications where improvement of anti-slip property, improvement of touch feeling and the like are required.

[0008] In order to reduce the density of the material itself according to these uses, there are roughly the following four methods.

A chemical foaming agent of the thermal decomposition type is used.

[0010] A hollow filler is added.

An oil such as naphthenic oil or a plasticizer is blended at a high concentration to obtain a (high oil-extended) low specific gravity rubber.

A heat-expandable microballoon is blended.

[0013]

However, all of the above four methods have the following disadvantages or technical difficulties.

According to the method using a thermal decomposition type chemical foaming agent, rubber is crosslinked with a vulcanizing agent or the like in order to enhance the physical properties of the rubber. It is difficult to adjust the starting temperature and speed of the process. Further, depending on the foaming agent, mutual interference between crosslinking and foaming may also occur. For these reasons, not only are the mixing ratios greatly restricted, but also the processability, shape retention, flame retardancy, water absorption and the like of the product are restricted, and the use of the product is limited.

In the method of adding a hollow filler, the filler itself is an inorganic material such as hollow glass spheres and has a large density of 0.2 to 0.7 g / cc, so that the effect of reducing the density is small. In addition, as is particularly the case with low-density fillers, those that break during kneading are produced, so that the effect is also small from this aspect. Further, rubber properties such as elongation are also reduced.

In the method of lowering the specific gravity due to the high oil extension and blending such rubber, the green strength (strength at the time of unvulcanization) is reduced, and the moldability becomes difficult. Further, in the case of a blend, the specific gravity of the oil-extended rubber is 0.87 to 0.93.
Therefore, the effect of weight reduction is small.

In the method of adding a thermal-expansion type microballoon of the type described above, it is difficult to disperse the microballoon in a base material or a rubber to be compounded (base material) as a matrix. That is, since the microballoons are inevitably somewhat uneven in shape, dimensions, and the like, they have a large angle of repose and tend to stick together and harden. as a result,
In the base rubber, the microballoons made of thin organic material burst due to shear pressure of a Banbury mixer or the like due to the fact that the microballoons rub against each other and further increase the viscosity of the base material due to the mixing, For these reasons, the dispersion of the thermal expansion type microballoons in the product is poor, and a uniform foam cannot be obtained.

In addition, the physical properties of rubber are generally reduced due to the incorporation of expanded microballoons.

Naturally, in order to solve these problems, the method described above, which is considered to have a small effect on the use of the product and the effect is considered to be large, is combined, or a surfactant capable of dispersing microcapsules by the method is found or developed. Things have also been done.

However, even if the above methods are combined, the dispersibility of the heat-expandable microcapsules is not improved. If a surfactant is added to improve the dispersibility, then the heat-expandable microcapsules are all converted to rubber. Instead of staying inside, they escape to the outside of the rubber.

Further, selection of a special surfactant, development of some other means, and the like have been studied and studied, but there are various problems at present. That is, for example, if the amount of the surfactant is large, it may have a negative effect on the decrease in density. Even if it is uniformly dispersed, it does not matter if the processability of the rubber itself is reduced. There are also cost constraints. In addition, depending on the application, the product is required to have other properties such as good touch feeling, but it is necessary to satisfy such properties.

Furthermore, depending on the product, carbon black, white carbon, red iron oxide, titanium oxide, calcium carbonate, pigments, and the like are often compounded and mixed in the rubber, but even in this case, there is a demand for achieving good weight reduction. Is also strong.

[0023] For these reasons, the low-density low enough to be practically used from the viewpoints of performance, cost, etc. required for various uses and products, centering on the above-mentioned method, in which the use of the product is widened and the effect of weight reduction is large, is mainly used. The development of excellent rubber has been desired.

[0024]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a physical, chemical, and physical properties for uniformly dispersing a heat-expandable microballoon in a rubber to be chemically crosslinked. The mechanical mechanism was investigated, and as a result, a good base material was found.

In addition, the present inventors also investigated the physical and chemical mechanism by which the physical properties of rubber were not reduced even when inflated microballoons were mixed therein, and found a base material satisfying the same.

Further, in addition to the above two, preferred mixing (blending) means, mixing method, use of the mixed rubber product, application to other resins, and the like. Specifically, the configuration is as follows.

According to the first aspect of the present invention, the base material for uniformly and reasonably dispersing the heat-expandable microballoons in rubber, a thermoplastic elastomer, or a mixture thereof is a carbon material having molecules of (CH ₂ ) _n. Hydrogen is bonded to each other via a double bond in a large number, cyclic or four or more regular polygonal shapes. For this reason, unlike surfactants, molecules not only have no polar groups, but also are shaped like rubber bands rather than needles or rods, so they are mainly physically and mechanically irrespective of the presence or absence of polar groups such as base rubber. The surrounding surface of the spherical heat-expandable micro-balloons by mechanical action and separate them from each other,
Further, this is uniformly dispersed in the base material. At this time, since the melting point is about 54 ° C., it acts as a lubricating oil, so that it not only seeps into the heat-expandable microballoons but also makes them approach each other during mechanical kneading. Also prevent. Further, unlike the surfactant, since there is no adverse effect on the plasticity and the like of the rubber of the base material, there is no difficulty when mixing the thermally expandable microballoons into the base material. As a result, during the kneading, no shearing action of a kneader such as a Banbury mixer of microballoons or rupture due to mutual contact occurs.

In addition, when the rubber is vulcanized, the base material itself has a large number of hydrocarbon-based substances and a large number of double bonds, so that, at the same time, a three-dimensional cross-link is formed to reduce the density of the base material. Contributes to improved characteristics.

According to the second aspect of the present invention, the first aspect is provided.
The hydrocarbons (CH_Two)_n
Is 6 in the invention of claim 3
(CH _Two)₆Hydrocarbons, for example, 10
Do it.

This is because 1.5-cyclooctadiene was synthesized from 1.3-butadiene, and metathesis polymerization was carried out to convert cyclooctene into transpolyoctenemer.
For metathesis (catalyst, polymerization reaction, etc.),
Since it is a well-known fact and technology described in “Chemical Encyclopedia (K.K. Tokyo Chemical Doujinshi)”, “Graduate Complex Chemistry (Kodansha)”, etc., the description is omitted.

In the invention according to claim 4, the base material is synthesized by a metathesis reaction, and the molecule is a trans-polyoctenemer rubber having a cyclic or four or more regular polygonal shape. The ratio of trans to cis is approximately 80:20, but this can be changed to some extent by controlling the polymerization reaction.

According to the fifth aspect of the present invention, there is provided the first aspect.
A base material 20 according to any one of claims 1 to 4.
To 80 parts or less (preferably between 40 parts and 75 parts) and 80 parts or less to 20 parts or more of thermal expansion microballoons (preferably 25 parts or more and 60 parts or less). .

Thus, each user purchases a master batch in the form of pellets, for example, and mixes it with base rubber or the like to reduce the weight of his own rubber product or thermoplastic elastomer.
Will be blended. At this time, since there is already a layer of the base material around the thermal expansion type microballoon, when kneading with the base material (compounded material, main material) for dispersion and mixing into the base material, the thermal expansion There is no contact between the microballoons. In the case of a pellet, the heat-expandable microballoons are prevented from being scattered at the time of administration to or mixing with the base material. In addition to the above, the masterbatch contains a small amount of a naphthenic oil as an auxiliary agent, an external lubricant such as ethylene bisstearamide, or a plasticizer such as DOP, for example, 0.1 to 100 parts of the masterbatch. About 1 part may be mixed.

Further, it is a matter of course that carbon black, white carbon, pigment and the like may be blended in the base rubber for some other purpose.

In the invention according to claim 6, claim 1 is
0.5 to 80 parts of the base agent according to claim 4 or less,
The foamed rubber is composed of 2 to 20 parts of the thermally expanded (and expanded) microballoons and 100 parts of the base rubber. When the amount of the base agent is large, it can also serve as a compatibilizer for a plurality of types of rubber having poor compatibility.

According to the seventh aspect of the present invention, in the sixth aspect,
102.5 parts or more and 200 parts or less of the foam type rubber described,
It is a rubber product such as a rubber shoe sole or a bicycle tire, comprising from 0 to 400 parts of a filler such as carbon black.

Thus, the abrasion resistance is improved by the filler, particularly carbon black, and the anti-slip effect is exhibited by the expanded microballoon. And, of course, it became a rubber shoe sole and a bicycle tire which were lightweight and had good other rubber properties.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on its embodiments.

(First Embodiment) The present embodiment relates to a base material for appropriately dispersing heat-expandable microballoons in rubber and a masterbatch for rubber foaming using the base material.

The thermal expansion type microballoon used in this embodiment is commercially available under the trade name EXPANCEL. This is because the outer shell is made of thermoplastic terpolymer of methyl methacrylate (MMA), acrylonitrile (AN) and acrylonitrile methacrylate (MAN), and the surface is further treated with siloxane or siloxane. It was done. As the liquid hydrocarbon for expanding the inside thereof, liquid isopentane or liquid isobutane is used.

Although there are some differences depending on each type, an approximate particle diameter of 10 μm and a density of 1000 to 1200 kg /
m ³ approximately spherical particles, each 40μm by heating at 100 ° C. to 200 DEG ° C., 20-30 kg / m ³ approximately much larger shape, and is made of a low-density spherical particles.

Next, according to this principle, the liquid hydrocarbon inside is vaporized by heating and expands the softened outer shell, and the outer shell is cooled and solidified while maintaining the expanded shape even when the temperature returns to room temperature. Because it retains its expanded shape and dimensions. The material, dimensions, heating temperature and the like can be selected to some extent depending on the application.

In addition, if the resin is expanded by being mixed in an appropriate amount and appropriately in various resins and expanded, not only the density is reduced, but also the compressibility, anti-slip property,
Properties such as vibration damping property and touch feeling are improved. However, since these are well-known technologies, further description will be omitted.

Next, as the base material, in the present embodiment, a transpolyoctenemer commercially available under the trade name VESTENEMER or VESTENEMER 8012 was used. This is specifically achieved by converting 1.2 polybutadiene to 1.5
It is produced by cyclooctene formation via cyclooctadiene, followed by polymerization using a ring-opening metathesis catalyst. Therefore, it has a molecular structure as shown in FIG.

As clearly shown in this figure, the molecular shape is cyclic or regular poly (square) square, and the double bond of cyclooctene is maintained during the polymerization reaction. Is a carbohydrate having two types of bonds.

Further, the ratio of trans to cis of the double bond is 80:20 and the melting point is 54 ° C., which can be changed to some extent by controlling the polymerization reaction.
The melting point increases with an increase in the amount of transformer.

A product having a higher molecular weight and a ratio of trans to cis of 60:40 (Vestenemer 621)
3) can also be manufactured.

Further, unlike a surfactant, it does not have a polar group. For this reason, even if it mixes with rubber, there is no adverse effect on the processability due to the plasticization that impairs the uniform dispersibility of the thermally expandable microballoons and the kneadability of the rubber. Now, since the molecule of this bestenemer is cyclic, its own density is as small as 0.53 g / cc at 20 ° C., which is preferable for reducing the density of rubber. Furthermore, it liquefies itself at the temperature at which the thermally expandable microballoons are kneaded, and is rich in fluidity at this melting point. Further, it has rubber properties due to the molecular shape and the presence of double bonds.

When compounded in rubber, the rubber itself not only forms a crosslink with the rubber during vulcanization, but also has a large number of double structures in the cyclic structure of its own molecule. Is three-dimensional, and exhibits a great effect in improving rubber characteristics. However, since the bestenemer itself is a so-called well-known substance, further detailed description is omitted.

Hereinafter, a method for producing a masterbatch for lowering the density will be described, focusing on the mixing of the thermal expansion type microballoon and the vestenemer.

First, a laboratory test was performed.

1) The bestenemer was melted for about 1 minute at 60 to 70 ° C. using an open roll, and kneaded together.

2) 30 parts for 70 parts bestenemer
Parts of Expancel were added little by little while kneading over about 5 minutes.

3) After completion of the addition, the foaming master batch composed of a mixture of both materials was cut into a sheet, and after heat removal, cut into a pellet with a pelletizer. In addition,
The density in this state was 0.83 g / cc.

When the master batch in this state is foamed at 160 ° C. for 10 minutes, the density becomes 0.032 g /
cc.

(Second Embodiment) The present embodiment is the same as the previous embodiment in respect of the rubber foaming masterbatch, except that a small amount of naphthenic oil is added to facilitate the kneading of both materials. It is.

As in the previous embodiment, the main ingredients are 30 parts of Expancel and 70 parts of Vestenemer, to which 0.1 to 0.2 part of a naphthenic oil is added when kneading Vestenemer. did. Thereby, the kneadability with Expancel was improved.

The addition of 0.01 to 0.5% by weight of the lubricant did not adversely affect the kneadability and the like. The foamability and density were practically the same because of the small amount of the naphthenic oil added.

(Third Embodiment) The present embodiment relates to a production method in an actual machine at a mass production stage.

70 kg of bestenemer 8012, 0.2 kg of naphthenic oil, a small amount of ethylenebisstearamide, 30 kg of Expancel 092DU-120
Were sequentially put into a 500 L supermixer (manufactured by Kawata Corporation) and mixed for about 1 minute at a stirring speed (about 360 rpm) at which the temperature did not rise to 45 ° C. or more.

Next, the mixture obtained above was placed in a twin-screw extruder (GT-110, manufactured by Ikegai Co., Ltd.), and the cylinder temperature was 50 ° C. and the screw speed was 30 rpm.
m, kneading under the condition of temperature of die section 80 ° C, diameter 3 ~
Extruded to 3.5 mm.

The strand extruded from the die was immediately hot-cut with a rotary cutter attached to the die outlet. Furthermore, the pellets immediately after the hot cut are placed in a pellet cooler equipped with a hexagonal rotating body, cooled while rotating to a temperature of 50 ° C. or less, and at the same time, 0.4% ethylene bisstearamide is used as an external lubricant. Sprayed and attached to pellets. The temperature of the pellets immediately after hot cutting is close to the melting temperature, and if they are left as they are, they may stick to each other.

The master batch of the present embodiment is
As in the case of the first embodiment, a good master batch was obtained.

(Fourth Embodiment) The present embodiment relates to compounding with rubber.

The masterbatch for foaming rubber according to the third embodiment was actually mixed with 99 parts of SBR (styrene / butadiene / rubber) using a banbury for one part. At this time, the master batch was uniformly dispersed in the rubber of the base material, and no problems such as a decrease in green strength occurred. Furthermore, since the powdered Expancel is bonded to each other using naphthenic oil as the bestenemer and process oil, or because it is a pellet-shaped master batch, the Expancel powder is mixed when mixed into the SBR. There was no splattering. Needless to say, there was no adverse effect of the lubricant or the external lubricant.

Next, the Expancel was expanded by exposing it to a temperature of 180 ° C. for 5 minutes also for vulcanization of the rubber. This resulted in a product density of about 70%.

Further, various rubber characteristics of the foamed rubber as a material of the product were also very good.

Now, for those reasons, it can be considered as a result of the following operation.

First, micro-balloons are dispersed. 1) Since they have no polarity unlike surfactants, there is no adverse effect such as plasticizing rubber as a base material. As a result, when the rubber is kneaded to disperse the thermally expandable microballoons, the rubber does not stay inside the rubber and does not escape to the outside.

2) Since rubber is used as a base material, it is physically well compatible with the rubber of the base material. Even at the kneading temperature, it is not a pure liquid but a semi-fluid oil, and since it is annular, it is solid and, unlike a rod-shaped polymer, easily enters between solid microballoons. For this reason, as shown conceptually in FIG. 2 (1), at first one small micro-balloon and one small vestenemer molecule 2 enter into a gap.

Next, as shown in FIG. 2 (2), a layer of vesnetenemer 2 is formed on the outer surface of the microballoon 1, which prevents contact between the microballoons. (Conceptually, it seems that soap molecules surround the scale. However, mechanically, it is a physical and mechanical action rather than polarity and electricity. Therefore, rubber-like rubber-like vestenemer molecules Is attached to the surface of the microballoon, so to speak.) Next, foaming of the thermal expansion type microballoon is as follows: 1) The outer shell of the thermal expansion type microballoon is a thermoplastic resin having gas barrier properties. For this reason, the liquid hydrocarbons remain inside even if vaporized, and do not react with the base rubber, the sulfur added thereto, or the bestenemer around the outer shell.

2) Since the outer shell itself is thermoplastic and the bestenemer is present around it, the outer shell of the heat-expandable microballoon does not have an undesirable reaction with a vulcanizing agent such as sulfur in the base rubber. .

Lastly, the rubber properties centered on the mechanical properties of the product after vulcanization are as follows: 1) Since the bestenemer itself is a rubber having a double bond in each part of the cyclic molecule, FIG. As shown in (1), cross-links are formed three-dimensionally at a plurality of locations with each other and with the rubber of the base material. At this time, the crosslink density of the base material, the outer peripheral portion of the expanded microballoon, and the like of the bestenemer are not uneven. This improves the mechanical strength. FIG. 3
, Black thick lines indicate molecules. 2 is a bestenemer molecule, 3 is a linear polymer, and 4 is a linear low molecule. Further, the thin line 5 indicates crosslinking by sulfur.
FIG. 3B shows the case of a linear polymer. (3) is the case of a linear low molecule. In practice, this is not necessarily the case because of the presence of long rubber molecules (not shown). However, in the case of (2) or (3), the mutual bonding of molecules by crosslinking and the Binding with
Further, it is considered that the compensation of the uneven crosslink density of the base rubber due to the presence of the microballoon is naturally limited.

2) The inflated micro-balloon itself is a hollow sphere made of a resin shell having a thickness of about 0.1 μm, and is thus rich in elasticity and vibration absorption. Further, the surface of the product rubber becomes uneven due to the expansion, which exerts an inherent effect such as anti-slip.

Next, a test was conducted using other types of rubber such as EPDM, or changing the mixing ratio of the master batch from 0.5% by weight to 3% by weight. Product.

(Fifth Embodiment) In this embodiment, the bestenemer also serves as a compatibilizer.

Depending on the product, it is a common practice to blend (blend) different types of rubbers and resins because only one type of rubber does not have sufficient performance. However, depending on the type of rubber or resin, for example, NBR (acrylonitrile-butadiene rubber) and EPT, EPDM
(Ethylene propylene diene terpolymer)
There is no compatibility because the P values (solubility coefficients) are different from each other. However, due to its low molecular weight, bestenemers are soluble in any rubber polymer regardless of SP value. During the subsequent vulcanization, the bestenemer forms a crosslinked chain with both the NBR molecule and the EPDM molecule, thereby fusing polymers having different SP values. As a result, a masterbatch having a large content ratio of bestenemer not only lowers the density, but also gives good compatibility to both rubbers having low compatibility.

For this reason, in this embodiment, a masterbatch having a higher proportion of the bestenemer is used as compared with the third embodiment. Specifically, 80 parts of Vestenemer and 10 parts of a thermal expansion type microballoon are blended with 50 parts of NBR having poor weather resistance but good oil resistance and 50 parts of EPDM having poor oil resistance but good weather resistance. The master batch was blended so that

As a result, both rubbers were homogeneously compatible with each other, and were excellent in oil resistance and weather resistance. Furthermore, the microballoons were uniformly dispersed and expanded, resulting in a lightweight rubber.

(Sixth Embodiment) The present embodiment relates to a rubber in which carbon black is also dispersed for use in shoe soles and bicycle tires.

1.5% by weight of the master batch of the third embodiment was blended into rubber already mixed with 30% by weight of carbon black.

In this case as well, the thermal expansion type microballoons are not only dispersed uniformly, but also contact with the carbon black is prevented by the bestenemer molecular layer present around and on the outer surface. Did not occur.

Next, the weight percentage of carbon black was
Experiments were carried out with a rubber containing various fillers such as a rubber mixed with white carbon while changing the value up to 40, and all showed good performance.

(Seventh Embodiment) The present embodiment relates to a product.

NBR (Zeon Corporation Nippol)
1042), 30 kg, BR (Ube Industries, Ltd. UBEP)
30 kg of OL-BR150L), 40 kg of oil-extended SBR (Nihon Zeon Co., Ltd., Nippol 1778J), and carbon black, zinc white, etc. were kneaded at 100 ° C to 150 ° C with a Banbury mixer for 5 to 10 minutes. Next, the kneaded dough is put on an open roll, and sulfur, a vulcanization accelerator D
M and D were added in this order, the sheet was taken out, and cut into an appropriate size. Then, the cut sheet was pressed and pressed into a shoe sole at a vulcanization temperature of 170 to 180 ° C.

Initially, 3% by weight of Expancel was added alone, but concentrated at one place with a rubber bottom, causing cohesive failure and chipping of the product. Next, a processing aid for rubber (chemical name, surfactant-treated special fatty acid ester [product name:
KENGARD 300-P, manufacturer: Sanchem Tech Co., Ltd.) 3% by weight, Expancel 3% by weight
Was added to improve the dispersibility of the Expancel, but the entire rubber was too plasticized, so that the Expancel did not stay inside the rubber but all escaped to the outside of the rubber.

Finally, 10% by weight of a master batch of 30/70 by weight of Expancel and Vestenemer was added, and shoe soles were manufactured by the above-mentioned manufacturing method, and the properties were observed. As a result, the appearance was good, and a uniform and favorable foaming state was observed by loupe observation of the fractured surface, and the specific gravity was reduced from 0.8 to 0.6 or less as intended.

Although the present invention has been described based on some embodiments, it is needless to say that the present invention is not limited to these embodiments. That is, for example, the following may be performed.

1) The base material is not only rubber such as silicone rubber, natural rubber, chloroprene rubber, urethane rubber, isoprene rubber, acrylic rubber, and EPT, but also EVA and thermoplastic elastomer which can be mixed at a temperature of several tens of degrees. I have.

2) The degree of vulcanization is varied depending on the use of the product.

3) Different from those used in the embodiment as a dispersant under the expansion of future demand, development of technology, etc.
For example (CH ₂₎ or different and n _n is 6, (CH ₂₎
The bestenemer equivalent material in which the number of ₆ is 11 or more is used.

4) The oil added for improving the kneadability is
Paraffin oil and aroma oil are used.

5) The masterbatch is subjected to after blending as necessary.

[0094]

As can be seen from the above description, according to the present invention, it is possible to uniformly disperse a microballoon-type expanding agent in various rubber materials by a simple process. As a result, the density of various rubber products is greatly reduced while maintaining the rubber characteristics.

Furthermore, since the base material itself forms a three-dimensional cross-link with the rubber during vulcanization, rubber properties such as elongation, tensile strength and tear strength are maintained despite weight reduction, and dimensional stability is further improved. Is also good.

In addition, since unevenness due to inflated microballoons is generated on the surface of the product, a slip prevention effect can be exhibited, and a matting effect also occurs.

In addition, since it is a porous type, the heat insulation and the vibration absorption are increased.

Further, the compression set is low.

For these reasons, it is possible not only to use a lightweight rubber material for shoe soles, rubber plates for vibration control, etc., but also for tires of bicycles, transport belts, fenders, rubber mats for cargo beds, Golf course sidewalk mats, lightweight rollers,
It can also be used as an anti-slip mat for stairs, casters, rubberized cloth for miscellaneous goods, exercise equipment such as tennis rackets, baseball bats and golf clubs.

Further, the present invention can be applied not only to rubber but also to various resins.

[Brief description of the drawings]

FIG. 1 is a diagram showing a molecular structure of a bestenemer used in an embodiment.

FIG. 2 is a view conceptually showing a state in which the outer periphery of a micro balloon is surrounded by a bestenemer.

FIG. 3 is a diagram conceptually showing that a so-called three-dimensional frame is formed by Vestenemer during vulcanization.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal expansion type microballoon 2 Bestenemer molecule 3 Linear polymer 4 Linear low molecule 5 Crosslink

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C08K 7/22 C08K 7/22 C08L 65/00 C08L 65/00 // A43B 13/04 A43B 13/04 A 13/12 13/12 A F-term (reference) 4F050 AA01 AA06 BA03 BA43 BA55 HA53 HA73 HA82 HA85 JA27 4F070 AA05 AA06 AA09 AA13 AA16 AA26 AA32 AA53 AA60 AB16 AC73 AC83 AD03 AD05 AE30 FA03 FA15 FA17 FB04 FB06 A07A04 FC06 AA43 AA48 AA49 AA78 AA90 AA98 AE07 CB61 CB74 CB84 CB85 CC22W DA36 DA40 DA45 DA59 4J002 AC00W AC01W AC06W AC07W AC09W BB06W BB15W BG04W BG06Y BG10Y BG11Y CE00X CK02W CP0300 DA0301

Claims (7)

[Claims] 1. A base material for uniformly dispersing a heat-expandable microballoon in a rubber or a thermoplastic elastomer, wherein the molecules are composed of hydrocarbons (CH ₂ ) _n which are cyclically or positively linked to each other via a double bond. A base material characterized by being joined in a polygonal shape. 2. The base material according to claim 1, wherein the base material is made of a molecule in which _n of hydrocarbon (CH ₂ ) n is 6. 3. The base material according to claim 1, wherein the base material is made of a molecule having a continuous hydrocarbon of (CH ₂ ) ₆ . 4. A base material for uniformly dispersing a heat-expandable microballoon in rubber or a thermoplastic elastomer, wherein the base material is a cyclic or regular polygonal trans polyoctenemer rubber synthesized by a metathesis reaction. Base material to do. 5. The method according to claim 1, comprising at least 20 parts and no more than 80 parts of the base material according to any one of claims 1 to 4, and at least 80 parts and no more than 20 parts of the thermally expandable microballoon. Master batch to do. 6. The base material according to any one of claims 1 to 4, comprising 0.5 to 80 parts of a base material, 2 to 20 parts of a thermally-expandable microballoon, and 100 parts of rubber. A foam type rubber material characterized by the above. 7. The base material according to any one of claims 1 to 4, wherein the base material is 0.5 to 80 parts, the thermal expansion type microballoon is 2 to 20 parts, rubber is 100 parts, and filler is provided. A rubber product, such as a rubber shoe sole or a bicycle tire, comprising 0 to 400 parts.