JPH07292169A - Grip - Google Patents

Abstract

PURPOSE:To obtain a grip useful as, e.g. a grip for a golf club, excellent in what is called 'moisty touch' which is a fitting touch to the hands and having slip-resistant properties even when the hands are wet with sweat or water. CONSTITUTION:This grip is made from a material (e.g. a sulfated molding of a rubber composition) exhibiting a loss elastic modulus (E'') at 50 deg.C under 0.01% strain amplitude and a ratio (E''/E*<2>) of the loss elastic modulus (E'') to square value (E*<2>) of the complex modulus (E*) within a range of the specified values shown below in temperature dispersion measurement of dynamic viscoelastcity under 2 deg.C/min rate of temperature rise and 10Hz frequency; (E''/E*<2>)X10<3>>=-0.520E''+5.82 E''/E*<2>>=2.39X10<-3> E''>=2.35 [E'': loss elastic modulus (kgf/cm<2>). E*: complex modulus (kgf/cm<2>)].

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip which is excellent in the so-called "moist feeling" which is familiar to the hand and which is "slip resistant" even when wet with sweat or water.

This grip includes grips for golf clubs, grips for rackets such as tennis, badminton, squash, and racket balls, grips for sports equipment such as ski poles, automobiles, motorcycles, and motorized bicycles. It can be applied to various fields such as grips for vehicles, grips for hand tools such as drivers and hammers, grips for handles of various mechanical devices, and the like.

[0003]

2. Description of the Related Art Generally, as an important characteristic required for a grip, a so-called "moist feeling" that is familiar to the hand and "difficulty in slipping", especially "difficult to slip even when wet with sweat or water" The characteristic is.

These characteristics are very important in terms of easiness of handling and safety when grips are attached to various tools and tools for use.

[0005] For example, in the case of a grip for a golf club, the familiarity and ease of gripping the hand when gripped greatly affect the golfer's swing, and the hand does not slip at impact, that is, the hand and the grip. It is very important that there is no misalignment between them and the above-mentioned "compatibility" and "difficulty in sliding" lead to reduction of miss shots. In particular, the characteristic that a hand does not slip even when it gets wet with sweat or water (for example, rainwater) has been a major problem for many years that a grip for a golf club needs to solve.

By the way, regarding the grip, there are roughly three kinds of basic materials of leather, resin and rubber.
Various grips have been made using these basic materials, but a grip that has both a "moist feeling" that is familiar to the hand and "difficult to slide" when wet with sweat or water. Is not found.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention provides a grip having both the characteristics of "moisturization" which is familiar to the hand and "difficult to slip" even when wet with sweat or water. With the goal.

[0008]

The present invention has a temperature rising rate of 2 ° C.
In the temperature dispersion measurement of dynamic viscoelasticity at a frequency of 10 Hz / min, a loss elastic modulus (E ″) at a temperature of 50 ° C. at a strain amplitude of 0.01% and a loss elastic modulus (E ″) and a complex elastic modulus (E)
^The above object was achieved by producing a grip whose ratio (E ″ / E ^{* 2} ) to the square value (E ^{* 2} ) of ^* ) is within the range of the following specific values.

(E ″ / E ^{* 2} ) × 10 ³ ≧ −0.520E ″ +5.82 E ″ / E ^{* 2} ≧ 2.39 × 10 ⁻³ E ″ ≧ 2.35 [E ″: loss elastic modulus (Kgf / cm ² )] [E ^* : complex elastic modulus (kgf / cm ² )]

That is, the loss elastic modulus (E ") and the square value (E) of the loss elastic modulus (E") and the complex elastic modulus (E ^* ).
^{* 2} ) ratio (E ”/ E ^{* 2} ) of the latter“ E ”/ E
E ^{* 2} "is an index of energy loss rate,
The "E" / E ^{* 2} "is E as described above" / E ^{* 2} ≧ 2.3
The large value of 9 × 10 ⁻³ contributes to the improvement of the “moist feeling” of the grip, and the loss elastic modulus (E ″) of the former indicates the magnitude of energy loss. The fact that E ″) is as large as E ″ ≧ 2.35 as described above is considered to contribute to the improvement of “difficulty in sliding”.

Then, between E "/ E ^{* 2} and E",
(E ″ / E ^{* 2} ) × 10 ³ ≧ −0.520E ″ +5.82
"E" / E ^{* 2} "is necessary even if
Even if "E" or "E" falls within the range of the above specified values, there are some that do not have sufficient "moist feeling" or "difficulty in sliding", and "E" / E ^{* 2} "or" E ″ ”is within the range of the above specific value, and (E ″ / E ^{* 2} ) × 10 ³ ≧ −
The reason why the condition of 0.520E ″ +5.82 is satisfied is that it has an excellent “moisturizing feeling” and has the property of being “difficult to slip” even when wet with sweat or water.

The production of the grip exhibiting the above-mentioned dynamic viscoelasticity is carried out by selecting the kind of the rubber / resin as the base material,
It can be carried out by selecting the type and amount of the compounding agent, selecting the vulcanization conditions, and the like.

Examples of the rubber / resin as the base material include, for example, natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, nitrile rubber, acrylonitrile butadiene rubber, chloroprene rubber, fluororubber, butyl rubber, ethylene propylene diene rubber ( EPDM),
Silicone rubber, epichlorohydrin rubber, polysulfide rubber, urethane rubber, thermoplastic elastomer such as poly (styrene-butadiene-styrene) terpolymer (SBS), polynorbornene, polystyrene, polyvinyl chloride, polytetrafluoro Examples thereof include thermoplastic resins such as ethylene, polymethylmethacrylate, polyethylene, and polypropylene. These can be used alone or in a mixture of two or more kinds.

The compounding agents include, for example, reinforcing agents and fillers such as carbon black, silica, clay and talc, methyltrimethoxysilane, hexamethyldisilazane, phenyltrimethoxysilane, dimethyldichlorosilane,
Silane compounds such as isobutyltrimethoxylane and tetraethoxysilane, coumarone resin, phenol resin, alkylphenol resin, aliphatic cyclic hydrocarbon resin, hydrocarbon resin, resin as a compounding agent for hydrogenated rosin, aromatic oil, naphthene Softeners such as oil and paraffin oil, plasticizers such as dibutyl phthalate, dioctyl adipate, tributyl phosphate, dioctyl sebacate, vulcanization aids such as stearic acid,
Examples thereof include processing aids, vulcanizing agents, vulcanization accelerators, vulcanization delay agents, and antiaging agents.

In order to allow the grip to exhibit the above-mentioned dynamic viscoelastic characteristics, it is preferable to use silica or carbon black as the reinforcing agent / filler, and mix them in a large amount. In particular, silica has a hydroxyl group, which is a polar group, on the surface, is rich in surface activity, and exhibits a large damping performance. However, due to the above-mentioned surface activity, silica has a high cohesive force between particles and has a markedly poor dispersibility. Therefore, when the blending amount of silica is large, kneading and molding work becomes difficult, and deterioration of physical properties such as a decrease in fracture strength and an increase in residual strain after elongation occurs. In the conventional technology, a large amount of silica was blended. Practical formulation was difficult to achieve.

Therefore, in the present invention, a silane compound which reacts with a hydroxyl group on the silica surface without reacting with a polymer during compounding and kneading of silica to convert the hydroxyl group on the silica surface into a nonpolar group such as a methyl group or a phenyl group. By adding the above, it has succeeded in preventing the occurrence of harmful effects due to a large amount of silica.

The silane compound is represented by the general formula R ¹ _X Si
In (OR ²⁾ _y, represented by R ¹ ₃ SiNHSiR ² ₃ compound, and specific examples thereof, such as methyl trimethoxy silane, hexamethyldisilazane, diphenyl silane, phenyl trimethoxy silane, dimethyldichlorosilane, Isobuchirutori Methoxysilane, tetraethoxysilane, methyltriethoxysilane, phenyltrichlorosilane, dimethyldimethoxylane and the like,
These silane compounds have a functional group that reacts with the hydroxyl group on the silica surface and converts the hydroxyl group on the silica surface into a non-polar group such as a methyl group or a phenyl group, but has a functional group that reacts with the polymer. Therefore, the polymer does not react with silica to reduce the damping performance.

In order to make the grip exhibit the above-mentioned dynamic viscoelastic characteristics by using this silica as a main component, it is preferable to add 20 to 80 parts by weight of silica to 100 parts by weight of rubber. At that time, the silane compound is silica 10
It is preferable to add 10 to 40 parts by weight to 0 part by weight. However, silica can be used in combination with other reinforcing agents / fillers, and in that case, it is not necessary to add a large amount.

Further, the dynamic viscoelastic property as described above can be exhibited in the grip by adding a large amount of carbon black and a resin.

Carbon black or resin is the above "E" / E
^The reason for increasing " ^{* 2} " or "E""is not always clear at present, but in the case of carbon black, when the structure of carbon black (secondary higher order structure) is destroyed when deformed. Energy loss occurs when the chemical bond between the carbon black and the rubber is broken, and the larger the amount of carbon black compounded, the greater the energy loss becomes.
It is considered that the values of “E ^{* 2} ” and “E” ”become large.
Further, in the case of a resin, its softening point is higher than room temperature, which causes large energy loss when deformed in the temperature range from near room temperature to near the softening point.
It is considered that the values of "/ E ^{* 2} " and "E""will increase.

Examples of carbon black include SA
F, HS-ISAF, HAF, HS-HAF, and other grades having a large surface area and a large structure are preferable, and examples of the resin include coumarone resin (coumaron-indene-styrene terpolymer). Hydrogenated rosin, alkylphenol resin, aliphatic cyclic hydrocarbon resin and the like are preferable. It is preferable to use both of these carbon blacks and resins in combination, but it is also possible to use each independently.

Also, when a large amount of carbon black or resin is blended, problems such as kneadability and processability arise as in the case of silica. In the case of carbon black, the processability etc. can be improved by increasing the amount of softening agent or plasticizer, but especially in the case of resin, the degree of dispersion / melting in the rubber composition has a great influence on the damping performance, and the dispersion of resin -Insufficient melting has not established a solution to the problem even though the damping performance is lowered.

Therefore, in the present invention, in order to solve the problems in processing and characteristics when a large amount of the above resin is blended,
As a result of intensive studies, in kneading with a kneader or other closed-type kneading machine, after thoroughly dispersing reinforcing agents and fillers such as carbon black and silica, processing aids, and softening agents, the resin was added at the end. Kneading until the torque value (electric power value) of the rotor, which indicates the shearing force applied to the kneaded rubber, exceeds its peak, so that the compounded rubber temperature at the time of discharge from the kneader is 30 ° C or more higher than the softening point of the resin. By doing so, we succeeded in exhibiting sufficient damping performance. However, a compounding agent system in which a large amount of resin is not mixed can be kneaded with an open roll or a closed kneader as in the conventional case.

Molding of the composition after kneading into a grip is carried out by vulcanizing, that is, by heat-treating under pressure at a predetermined temperature for a time when a rubber is used as a base material. Also,
When a thermoplastic elastomer that does not require vulcanization is used as the base material, it is also molded by the same heat treatment.

In addition to the above-mentioned large amount of silica and the large amount of carbon black and resin, as a means for increasing both "E" / E ^{* 2} "and" E "", a polymer having a high glass transition point (for example, , A polymer having a glass transition point near 0 ° C.) may be used. However, this method is not preferable because the temperature change of the complex elastic modulus (E ^* ) in the actual use temperature range (-10 to 40 ° C) is large and the strength characteristics are unstable.

The grip of the present invention includes a grip for a golf club, tennis, badminton, squash,
Grips for rackets such as racket balls, grips for sports equipment such as ski poles, grips for vehicles such as automobiles, motorcycles, and motorized bicycles, grips for hand tools such as drivers and hammers, and various mechanical devices. It can be applied to various fields such as grips for handles, and in those grips, it has an excellent "moist feeling" that is familiar to the hand and that it is "difficult to slip" even if it gets wet with sweat or water. Can be demonstrated.

[0027]

The grip of the present invention has a temperature rising rate of 2 ° C. /
Min, the loss elastic modulus (E ") at a temperature of 50 ° C and the loss elastic modulus (E") and the complex elastic modulus (E ^{* 2} ) at a strain amplitude of 0.01% in the temperature dispersion measurement of dynamic viscoelasticity at a frequency of 10 Hz. The ratio (E ″ / E ^{* 2} ) to the squared value (E ^{* 2} ) of the material is within the range of the following specific values, which gives a “moist feeling” that is familiar to the hand. It has excellent properties and can exhibit the property of being “non-slip” even when it gets wet with sweat or water.

(E ″ / E ^{* 2} ) × 10 ³ ≧ −0.520E ″ +5.82 E ″ / E ^{* 2} ≧ 2.39 × 10 ⁻³ E ″ ≧ 2.35

[0029]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.

Examples 1 to 5 and Comparative Examples 1 to 4 Unvulcanized rubber compositions obtained by kneading with the compounding compositions shown in Tables 1 and 2 were filled in a mold, and at 160 ° C., Table 1 was obtained. ˜Vulcanization was carried out for the time shown in Table 2 to mold a golf club grip having the shape shown in FIG. 1, followed by buffing and finishing. The different vulcanization times are due to the fact that optimum physical properties are obtained according to the respective compounding compositions.

Table 1 shows the composition and vulcanization time of Examples 1 to 5, and Table 2 shows the composition and vulcanization time of Comparative Examples 1 to 4. The blending amounts in the table are parts by weight, and in the case of displaying the blending materials in the table, those which are difficult to describe in detail due to space are shown in detail after Table 2.

[0032]

[Table 1]

[0033]

[Table 2]

* 1: RSS # 3 * 2: Califlex IR309 (trade name), manufactured by Shell Chemical Co., Ltd. * 3: SBR1500 (trade name), Japan Synthetic Rubber Co., Ltd.
Styrene-butadiene rubber manufactured by * 4: Esprene 505F (trade name), ethylene propylene diene rubber (EPDM) manufactured by Sumitomo Chemical Co., Ltd. * 5: Nocrac NS-6 (trade name), Ouchi Shinko Chemical Industry Co., Ltd. * 6: Seast 3 (trade name), HAF carbon manufactured by Tokai Carbon Co., Ltd. * 7: Nipseal VN3 (trade name), manufactured by Nippon Silica Co., Ltd. * 8: Polyethylene glycol (PEG4000) * 9: Sonic R1000 ( Product name), Nikko Kyokushi Co., Ltd.
Made naphthenic oil * 10: Si69 (trade name), Degussa Co., Ltd. screw (3
Triethoxysilylpropyl) tetrasulfide * 11: KBM13 (trade name), methyltrimethoxysilane manufactured by Shin-Etsu Chemical Co., Ltd. * 12: Esclone G90 (trade name), coumarone resin manufactured by Nippon Steel Chemical Co., Ltd. * 13: NOXCELLER CZ (trade name), manufactured by Ouchi Shinko Chemical Industry Co., Ltd. * 14: NOXCELLER NS (trade name), manufactured by Ouchi Shinko Chemical Industry Co., Ltd. * 15: NOXCELLER EP20 (trade name), Ouchi Shinko Chemical Industry Co., Ltd. * 16: Sunguard PVI (trade name), Monsanto Kasei Co., Ltd.

Now, referring to FIG. 1, FIG. 1 is a cross-sectional view schematically showing a grip for a golf club manufactured as described above, in which 1 is a main body of the grip and 1a is a grip. By inserting the end of the shaft of the golf club into the hollow portion 1a, which is the hollow portion,
The grip is attached to the golf club.

For the grip manufactured as described above, loss modulus (E ″), complex modulus (E ^* ), loss modulus (E ″) and complex modulus (E ^* ) squared value (E). ^{* 2} ) ratio (E "/ E ^{* 2} ), hardness, impact resilience," moist feeling "
And "difficult to slide" was investigated. The results are shown in Tables 3 and 4. Table 3 shows the results regarding the grips of Examples 1 to 5, and Table 4 shows the results regarding the grips of Comparative Examples 1 to 4.

Loss elastic modulus (E ") and complex elastic modulus (E ^* )
For the sample, a sheet having a thickness of 1.5 mm was collected from the grip, and the sheet was heated at a heating rate of 2 ° C / min (-80 ° C to 1 ° C).
Temperature rises to 00 ° C), frequency 10 Hz, strain amplitude 0.0
It was subjected to temperature dispersion measurement of 1% dynamic viscoelasticity, and loss elastic modulus (E ″) and complex elastic modulus (E ^* ) at 50 ° C. were measured.

The ratio (E "/ E ^{* 2} ) of the loss elastic modulus (E") to the square value (E ^{* 2} ) of the complex elastic modulus (E ^* ) is the above loss elastic modulus (E "). And the complex elastic modulus (E ^* ).

For the hardness, the sample taken from the grip is measured by JI.
It was determined by measuring with an SA type hardness meter.

For the impact resilience, the same unvulcanized rubber composition used to prepare the grip was placed in a mold and vulcanized in the same manner as the grip to form a spherical sample having a diameter of 20 mm. The impact resilience was calculated from the impact resilience when dropped from that point, and the impact resilience of Example 4 was 100.
It was shown by the index when.

The above-mentioned impact resilience index serves as an index of energy loss, and the smaller this value is, the greater the energy loss rate due to deformation becomes, and this impact resilience is obtained between samples having a similar complex elastic modulus (E ^* ). It is expected that the smaller the elasticity index, the more easily plastic deformation will occur, and as a grip function, the "moist feeling" that is familiar to the hand when gripped will improve.

The "moistness" and "slip resistance" of the grip are determined by mounting each grip on the No. 1 wood club (by mounting the end of the golf club shaft into the hollow part of the grip as described above). The golf club with the grip attached thereto was tested and hit by 100 testers (general golfers) and evaluated on a 5-level scale.

First, the "moist feeling" that is familiar to the hand is that 100 testers make golf clubs equipped with grips swing and try, and at that time, the one with the best familiarity to the hand is 5 The evaluation was made according to a five-point evaluation in which the evaluation points were lowered as the "comfortable feeling to the hand" was decreased in order, and the average value of the evaluation values of 100 persons is shown in Tables 3 and 4.

The "difficulty in slipping" means that the grip and gloves are wetted with water and 100 testers swing and test hit the golf club in that state.
The evaluation is made according to a five-point evaluation in which the evaluation points are gradually lowered as the "difficulty in sliding" is lowered, and 1 is shown in Tables 3 and 4.
The average value of the evaluation points of 00 people was shown.

A table of the loss modulus (E ") and the ratio (E" / E ^{* 2} ) of the loss modulus (E ") to the square value (E ^{* 2} ) of the complex modulus (E ^* ). In Table 3 and Table 4, the loss elastic modulus (E ″) is only E ″, and the loss elastic modulus (E ″) and the complex elastic modulus (E ^* ) squared value (E ^{* 2} ) The ratio (E ″ / E ^{* 2} ) is indicated only by E ″ / E ^{* 2} .

[0046]

[Table 3]

[0047]

[Table 4]

As is clear from the comparison of the results shown in Tables 3 and 4, the grips of Examples 1 to 5 have comparative grips of Comparative Examples 1 to 4.
"Grip" and "Difficult to slide"
Has a high evaluation score and is familiar to the hand, "moist feeling"
Was excellent and "difficult to slip" when wet.

Next, a description will be given of what measures were taken in terms of compounding so that the grips of the respective examples had the dynamic viscoelastic properties described in the claims.

In Examples 1 and 2, by mixing a large amount of silica having a large surface area and structure, "E" / E ^{* 2} ", which is an index of the energy loss rate at high temperature, and the large amount of energy loss. The loss elastic modulus (E ″), which indicates the value, is increased.

As described above, "E" / E ^{* 2} "and" E "" were able to be increased because silica has a hydroxyl group as a polar group on the surface, so that the surface is more excellent than carbon black. It is considered that this is due to the fact that it was highly active and thereby exhibited a large damping performance.

However, since silica is rich in surface activity as described above, the cohesive force between particles is high, and therefore the dispersibility is extremely poor, and the kneading and molding operations become difficult as the blending amount increases, and Since physical properties such as a decrease in breaking strength and an increase in residual strain after elongation occur, it has been difficult to practically compound a large amount of silica without any measures.

Therefore, in the present invention, a silane compound which reacts with the hydroxyl groups on the silica surface without reacting with the polymer during compounding and kneading of silica to convert the hydroxyl groups on the silica surface into nonpolar groups such as methyl groups and phenyl groups. By adding (for example, methyltrimethoxysilane, diphenyldimethoxysilane, etc., methyltrimethoxysilane is used in Examples 1 to 2 to convert the hydroxyl groups on the silica surface into methyl groups), a large amount of the above silica can be obtained. Solved the problem of formulation.

Examples 1 and 2 are examples in which the kneading and molding operations were improved without significantly impairing the damping performance by mixing the silane compound in an appropriate amount, and the compound was realized as a practical compound.

On the other hand, Comparative Example 1 and Comparative Example 2 are the same as those in Examples 1 and 2 in that a large amount of silica was blended, but in that case, methyltrisilane of the silane compound was used. A silane coupling agent, bis (3triethoxysilylpropyl) tetrasulfide, is used instead of methoxysilane. Since this silane coupling agent has both a functional group capable of reacting with the polymer and a functional group capable of reacting with silica, it acts as a cross-linking agent between silica and the polymer, and therefore "E" /
As can be seen from the fact that “E ^{* 2} ” and “E” ”are small and the index of impact resilience is large, the damping performance is lower than in Examples 1 and 2, and“ moist feeling ”is obtained. The evaluation value of is low.

That is, Examples 1 and 2 are examples of practical blends in which the problem of workability during the blending of a large amount of silica was solved while maintaining a sufficient damping performance, and the blending of a large amount of silica could be realized. It has an excellent "moist feeling" and "slip resistance" based on its large amount of silica.

In Examples 3 to 5, "E" / E ^{* was} obtained by adding a large amount of carbon black or resin (however, in Example 3, a part of carbon was replaced with silica) ^{. This} is an example in which " ² " and "E""are increased.

Even when a large amount of carbon black or resin is blended, problems like kneadability and processability arise as in the case of silica. Particularly in the case of a resin, the degree of dispersion / melting in the rubber composition has a great influence on the damping performance, and if the resin is insufficiently dispersed / melted, the damping performance becomes low.

In the present invention, as a result of intensive studies in order to solve the problems in processing and characteristics in the case of blending a large amount of the resin as described above, as a result, as a result, in kneading with a closed kneader such as a kneader, carbon or silica was kneaded. Such as reinforcing agents, processing aids,
After sufficiently dispersing the softening agent, etc., add the resin at the end and knead until the torque value (electric power value) of the rotor, which indicates the shearing force applied to the kneading rubber, exceeds the peak, and then discharge the rubber from the kneading machine. The temperature of the composition is 30 from the softening point of the resin.
By making the temperature higher than ℃, we succeeded in exhibiting sufficient damping performance.

In Examples 3 to 5 described above, Escron G90 (trade name, coumarone resin manufactured by Nippon Steel Chemical Co., Ltd.) was used as the resin, and the softening point of this Eskron G90 (trade name) was 95 to. Since the temperature is 100 ° C, the temperature of the rubber composition at the time of discharging from the kneader is 125 to 130 ° C.
I have to.

In addition to the above, as a means for increasing both “E ″ / E ^{* 2} ” and “E ″”, a polymer having a high glass transition point (for example, a polymer having a glass transition point near 0 ° C.) is used. There is a method to use. However, this method is not preferable because the temperature change of the complex elastic modulus (E ^* ) in the actual use temperature range (-10 to 40 ° C) is large and the strength characteristics are unstable.

With the inventive ideas as described above, the grips of Examples 1 to 5 capable of having the dynamic viscoelastic characteristics described in the claims are compared with the results shown in Table 3 and Table 4. As is clear from the above, as compared with the grips of Comparative Examples 1 to 4, "moist feeling" and "difficulty in sliding" when wet with water were excellent.

The relationships between the "moist feeling" of the grips and the "difficulty in sliding" when wet with water and the physical property values in Examples 1 to 5 and Comparative Examples 1 to 4 are as follows.

In the grips of Examples 1 to 5, "E" / E ^{* 2} ", which is an index of the energy loss rate, was 3.01 × 10 ^-3 .
6.50 × 10 ⁻³ (3.01 × 1 in the smallest embodiment 2)
It is 0 ^-3, which is as large as 6.50 × 10 ^-3 in Example 3, which is the largest), which is considered to have contributed to the improvement of the "moist feeling". This corresponds to the magnitude of the impact resilience index.

However, as can be seen by comparing Example 4 and Comparative Example 4, when the loss elastic modulus (E ″) is as small as 2.0 kgf / cm ² as in Comparative Example 4, even if Even if "E" / E ^{* 2} ", which is an index of the energy loss rate, is as large as in Example 4, the evaluation value of" moist feeling "is poor. That is, even if the energy loss rate is large, the loss elastic modulus (E ″) indicating the magnitude of energy loss
If is small, the "moist feeling" does not improve.

Further, the fact that the loss elastic modulus (E ″) is large means that the complex elastic modulus (E ^* ) is also large, which is considered to improve the “difficulty in sliding”. That is, when the loss elastic modulus (E ″) and the complex elastic modulus (E ^* ) are small,
The deformation of the grip due to the torque during impact, especially during miss shots, is large, and the grip is easy to move in the hand. On the contrary, when the loss elastic modulus (E ″) and the complex elastic modulus (E ^* ) are large, the deformation of the grip at the time of impact is small and the “difficulty in sliding” is improved.

This loss elastic modulus (E ") and complex elastic modulus (E"
The difference in characteristics based on the difference in the size of ^* ) is particularly noticeable in "difficulty in sliding" when wet with water. This is because, between the corresponding Examples and Comparative Examples, Examples 1 to 5 having a large hardness value are compared with Comparative Examples 1 to 4 having a small hardness value.
It corresponds to the excellent "difficulty in sliding" when wet with water.

As described above, the loss elastic modulus (E ")
And the ratio (E ″ / E ^{* 2} ) of the loss elastic modulus (E ″) to the square value (E ^{* 2} ) of the complex elastic modulus (E ^* ) is large, the grip has a “moist feeling” and “ It excels in both characteristics of "slip resistance".

The physical properties of the loss elastic modulus (E ″) and the ratio (E ″ / E ^{* 2} ) of the loss elastic modulus (E ″) to the square value (E ^{* 2} ) of the complex elastic modulus (E ^* ). The relationship between the value and the "moist feeling" and "difficulty in sliding" is as follows when viewed within the range specified in the claims.

As can be seen from the hardness value, the grip of Example 3 has the smallest impact resilience in the Examples,
The "E" / E ^{* 2} "value is the largest, and the impact resilience index is the smallest. Therefore, the evaluation of "moist feeling" is the best in the examples, but the "difficulty in sliding" when wet with water is the worst in the examples. On the contrary, the hardness and elastic modulus are large,
It can be seen that the grip of Example 4 in which the value of “E” / E ^{* 2} ”is slightly smaller is superior to“ moist feeling ”in“ difficulty in sliding when wet with water ”.

That is, an increase in the "E" / E ^{* 2} "value contributes to the improvement of the" moist feeling ", if anything.
It is considered that the increase of the “E” value contributes to the improvement of the “difficulty in sliding” when the surface is wet.

FIG. 2 shows "E" values and "E" / values of the grips of Examples 1 to 5 and Comparative Examples 1 to 4 described above.
"E ^{* 2} " value.

In FIG. 2, the horizontal axis is the "E""value,
The vertical axis is the "E" / E ^{* 2} "value, and the shaded Y is (E" / E ^{* 2} ) x
10 ³ = −0.520E ″ +5.82,
The area diagonally to the upper right of this diagonal Y is E ″ / E ^{* 2} × 10 ^3.
It is an area shown by> -0.520E ″ +5.82.

As a matter of course, the grips of Examples 1 to 5 have the dynamic viscoelasticity within the range of the following specific values. E ″ / E ^{* 2} × 10 ³ ≧ −0.520E ″ +5.82 E ″ / E ^{* 2} ≧ 2.39 × 10 ⁻³ E ″ ≧ 2.35

In the above embodiments, the grips for golf clubs have been described, but the present invention can be applied to grips other than those for golf clubs. In those grips, the golf clubs shown in the embodiments are used. Similar to the grips for cars, it can exhibit excellent "moist feeling" and "difficult to slip" even when wet with sweat or water.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an example of a grip for a golf club.

FIG. 2 shows the loss elastic modulus (E ″) value of the grips of Examples 1 to 5 and the grips of Comparative Examples 1 to 4 and the squared value (E) of the loss elastic modulus (E ″) and the complex elastic modulus (E ^* ). ^{* 2)} and the ratio (E "/ E * ²⁾ is a diagram showing the value.

[Explanation of symbols]

 1 Grip body 1a Hollow part

Claims (2)

[Claims] 1. A loss elastic modulus (E ″) and a loss elastic modulus (E) at a temperature of 50 ° C. at a strain amplitude of 0.01% in a temperature dispersion measurement of dynamic viscoelasticity at a heating rate of 2 ° C./min and a frequency of 10 Hz. )) And the complex elastic modulus (E ^* ) squared value (E ^{* 2} ) (E ″ / E ^{* 2} ) within the range of the following specific values. (E ″ / E ^{* 2} ) × 10 ³ ≧ −0.520E ″ +5.82 E ″ / E ^{* 2} ≧ 2.39 × 10 ⁻³ E ″ ≧ 2.35 [E ″: loss elastic modulus (Kgf / cm ² )] [E ^* : complex elastic modulus (kgf / cm ² )] 2. The grip according to claim 1, wherein the material forming the grip is a vulcanized molded product of a rubber composition.