JPH0824728B2 - Rubber composition for grip of golf club - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for a grip of a golf club, which is excellent in touch, ultraviolet resistance and abrasion resistance.

[0002]

2. Description of the Related Art Conventionally, leather or rubber has been used as a material for a grip constituting a grip portion (grip) of a golf club, but in recent years, rubber is widely used because of its easy maintenance. Became. However, the rubber grip is inferior in touch when gripped compared to leather.

Then, recently, in order to improve the feel of the rubber grip, a product in which polybutene is mixed with rubber has appeared. This utilizes bleeding of polybutene on the grip surface, and the bleeding polybutene film has a tactile sensation similar to that of a leather grip and an effect of protecting from ultraviolet rays. However, although the texture of this grip is close to that of leather and is excellent, there is a drawback in that the texture and UV resistance change during long-term use and the grip hardens. This is because the polybutene bleed is too early for typical grip life.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber composition for a grip of a golf club, which has good touch and ultraviolet resistance for a long time and is excellent in wear resistance. To do.

[0005]

A rubber composition for gripping a golf club according to the present invention comprises 100 parts by weight of rubber and 30 parts by weight to 100 parts by weight of polybutene and hydrogenated liquid polyisoprene in total. And the compounding ratio (weight) of the polybutene and the hydrogenated liquid polyisoprene is 1:
It is characterized by being 10 to 10: 1.

As described above, in the present invention, since the hydrogenated liquid polyisoprene is blended with the rubber together with the polybutene, the bleeding of the polybutene is slowed by the hydrogenated liquid polyisoprene, so that the feel and the ultraviolet resistance can be maintained for a long time. And it is possible to improve wear resistance. Hereinafter, the configuration of the present invention will be described in detail.

The rubber used in the present invention is not specified, and examples thereof include natural rubber (NR) and isoprene rubber.
(IR), chloroprene rubber (CR), butyl rubber, polybutadiene rubber (BR), acrylonitrile-butadiene copolymer rubber (NBR), styrene-butadiene copolymer rubber (SBR), ethylene-propylene terpolymer
(EPT) etc. NR / EPT type and EPT plain type are preferable.

As the polybutene, an ordinary commercial product may be used. Its molecular weight is, for example, 200 to 3000, preferably 10
It is from 00 to 3000. Hydrogenated liquid polyisoprene has, for example, a hydrogenation rate of 90%, an SP value of 8.5 to 9.5, and an average molecular weight of 20.
000 (Kuraray Kuraprene LIR 290). The rubber composition for gripping a golf club of the present invention comprises 30 parts by weight to 100 parts by weight of the polybutene and the hydrogenated liquid polyisoprene in a total amount based on 100 parts by weight of the rubber. When the total content of the polybutene and the hydrogenated liquid polyisoprene is less than 30 parts by weight, the touch and ultraviolet resistance are poor (see Comparative Examples 4 to 10 below), and when it exceeds 100 parts by weight, the abrasion resistance is poor ( See Comparative Examples 23 to 29 below).

The compounding ratio (weight) of polybutene and hydrogenated liquid polyisoprene is 1:10 to 10: 1.
If this blending ratio (weight) exceeds 10, the UV resistance becomes poor (Comparative Examples 9, 10, 13, 14, 17, 18, 21, 22, 2 described later).
However, if it is less than 1/10, the bleeding speed of polybutene cannot be suppressed and the tactile sensation is reduced at an early stage (Comparative Examples 4, 6, 11, 12, 15, 16, 19, 20, 23, 24 described later). See).

In the present invention, other compounding agents such as a vulcanizing agent such as sulfur, a vulcanization accelerator, an antiaging agent and a reinforcing agent such as carbon black can be optionally compounded, if necessary. .

[0011]

Example A rubber composition was prepared with the following formulation (parts by weight). In this case, the respective blending amounts of polybutene and hydrogenated liquid polyisoprene (hereinafter referred to as hydrogenated liquid polyisoprene) are shown in Tables 1 to 3. As polybutene, Nisseki Polybutene HV-1900 (Molecular weight 23
50) was used as the hydrogenated liquid polyisoprene, and Kurapre LIR 290 manufactured by Kuraray Co., Ltd. was used. In Table 1, liquid polyisoprene (Kurapre LIR 30 manufactured by Kuraray Co., Ltd.) was used in place of hydrogenated liquid polyisoprene in Comparative Example 2, and ethylene-α olefin copolymer (Lucant HC-2000 manufactured by Mitsui Petrochemical Co., Ltd. was used in Comparative Example 3. ) Is used. Blend Description EPT (Mitsui Petrochemical Ltd. EPT4070) 100 parts by weight of a polybutene Tables 1 3 hydrogenated liquid form polyisoprene Tables 1 3 White carbon 40 parts by weight of zinc white 5 parts by weight 1 part by weight of sulfur 1.5 part by weight of stearic acid 2 parts by weight of vulcanization accelerator The obtained rubber composition was evaluated for touch, UV resistance and abrasion resistance as follows. The results are shown in Tables 1 to 3.

Tactile sensation : The following A to C were judged by a normal tactile sensation test by 30 random persons. A: Good with a moist feeling similar to a leather grip. B: I feel that there is a moist feeling similar to a leather grip. C: Feeling is the same as conventional products.

Among them, the number of persons who chose A was 25 or more, and was “◯”, 20 to 24 were “Δ”, and 19 or less were “X”.
In Tables 1 to 3, “BL” means an evaluation result when a tactile test was conducted with a grip attached to a golf club 24 hours or more after vulcanization molding, and “after sunshine” means the above. This means the evaluation results when a tactile sensation test was conducted in the same manner after exposing the mounted grip to the sunshine weatherometer for 200 hours.

UV resistance : After irradiation with a high pressure mercury lamp of 120 W for 20 hours from a height of 47 cm (corresponding to a state of being left in natural light for one year), a random tactile test by 30 people revealed that the tactile sensation changed before and after irradiation. If there are less than 3 people who feel the "○",
4 to 6 people gave "△", and 7 or more people gave "x".

Abrasion resistance : Pico abrasion test (60 rpm × 80 times,
With a load of 0 kgf and powder), the wear amount was 0.025 cc or less, "○", from 0.025 to 0.03 cc to "△", and if it was more than 0.03 cc, "X". Judgment Criteria (Comprehensive) : If there is at least one "X", it is defective "X", "○" and "△" only, and if there is at least one "△", it is good "△", if it is only "○" it is the best " ○ ” Those of the present invention are good or best.

[0016]

[0017]

[0018] As is clear from Tables 1 to 3, the rubber composition of the present invention
It can be seen that (Examples 1 to 16) are comprehensively superior.

[0019]

As described above, according to the present invention, since polybutene and hydrogenated liquid polyisoprene are blended in a specific proportion to rubber, it is possible to improve both touch, ultraviolet resistance and abrasion resistance. Is possible.

Claims (1)

[Claims] 1. A total amount of 30 parts by weight to 100 parts by weight of polybutene and hydrogenated liquid polyisoprene per 100 parts by weight of rubber.
The blending ratio (weight) of the polybutene and the hydrogenated liquid polyisoprene is 1:10 to 10: 1.
Which is a rubber composition for grip of a golf club.