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Rubber composition and golf ball employing the same

A technology of rubber composition and base polymer, which is applied in the rubber composition of golf balls and golf balls, to achieve the effects of excellent dimensional stability and excellent processability of extruded products

Inactive Publication Date: 2007-10-10
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cross-link density has not changed compared with conventional high-cis polybutadiene, so it is necessary to improve durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0074] Embodiments based on the present invention will be specifically described below. The microstructure was identified by infrared absorption spectroscopic analysis. The microstructure consists of cis-740cm -1 , trans 967cm -1 With vinyl 910cm -1 The absorption intensity ratio is calculated.

[0075] Molecular weights (Mw, Mn) are measured by the GPC method using HLC-8220 (manufactured by Toso Inc.), and calculated in terms of standard polystyrene.

[0076] The viscosity (Tcp) of the toluene solution was measured as follows: 2.28 g of the polymer was dissolved in 50 ml of toluene, using a standard solution for viscometer calibration (JIS Z8809) as a standard solution, using a Canon-Fenske viscometer No. 400 at 25° C. Determination.

[0077] Mooney viscosity of raw rubber (ML 1+4 , 100°C) measured in accordance with JIS 6300.

[0078]Extrusions were formed by MPT (processability tester manufactured by Monsanto Inc.) under conditions of a die (D=1.5 mm, L / D=1) at a tem...

Embodiment 1～6

[0082] Examples 1-6, Comparative Examples 1-5

[0083] Rubber compositions for golf balls were produced using the polybutadiene shown in Table 1. Conditions and results are shown in Table 2.

[0084] Product name

Experiment 1

Experiment 2

Experiment 3

BR150

BR01

BR51

BR730

CB24

manufacturer

Ube Xing

Produce

Ube Xing

Produce

Ube Xing

Produce

Ube Xing

Produce

JSR

JSR

JSR

Bayer

Catalytic system

co

co

co

co

Ni

Nd

Nd

Nd

Mooney viscosity

60

65

72

43

44

34

56

45

cis 1.4

Content (%)

98

98

98

97

96

97

98

97

Mw(10 4 )

63

69

71

54

63

52

73

60 ...

experiment example 2

[0101] The microstructure, molecular weight (Mw, Mn), viscosity (Tcp) of toluene solution, hardness and resilience were measured in the same manner as in Experimental Example 1.

[0102] Determination of Mooney Viscosity of Raw Rubber and Compounds Based on JIS 6300 (ML 1+4 , 100°C). The Mooney viscosity of Comparative Example 6 was set to 100, and the Mooney viscosity of the mixture was evaluated from the index relative to Comparative Example 6. The smaller the index, the smaller the viscosity and the better the workability.

[0103] The roll workability was judged by winding the mixture on a 6-inch roll at 50° C. and visually observing the winding state. According to the measuring method stipulated in JIS-K6251, use No. 3 dumbbell-shaped test pieces, measure the tensile strength under the condition that the tensile speed is 500mm / min, and set the value of Comparative Example 6 as 100, and then compare the The index of Example 6 was evaluated. The larger the index, the hi...

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PUM

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Abstract

A rubber composition which has excellent suitability for roll processing while retaining hardness and high impact resilience and is suitable for use in golf balls. The rubber composition is characterized by comprising: a base polymer comprising (A) 20-99 parts by weight of high-cis polybutadiene which has been synthesized with a cobalt catalyst and has a Mooney viscosity of 50-70 and a molecular weight distribution (weight-average molecular weight (Mw) / number-average molecular weight (Mn)) of 2.5-3.8 and (B) 80-1 part by weight of high-cis polybutadiene having a Mooney viscosity of 30-70 synthesized with a catalyst which is not a cobalt catalyst; and a cocrosslinking agent incorporated in the base polymer.

Description

technical field [0001] The present invention relates to a rubber composition used for the following products: golf balls; tire external members such as tread and sidewall and tire internal members such as carcass, belt and rim; such as anti-vibration rubber, tape, hose and shock-absorbing rubber; and footwear such as men's and women's shoes and athletic shoes. More specifically, the present invention relates to rubber compositions for golf balls and golf balls. Background technique [0002] As the so-called microstructure, in the molecular chain of polybutadiene, there are both bonded parts (1,4-structure) generated when polymerized at the 1,4-position and bonded parts generated when polymerized at the 1,2-position (1,2-structure). The 1,4-structure can be further divided into the following two structures: cis structure and trans structure. On the other hand, the 1,2-structure is a structure having a vinyl group in a side chain. [0003] It is well known that polybutadie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00A63B37/00C08K5/00
Inventor 冈本尚美石口康治
Owner UBE IND LTD
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