Golf Ball Core Composition for Durability and Resilience
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Solution Overview
Problem
Existing golf ball cores lack durability due to insufficient resilience and hardness, leading to compromised performance in terms of shot feel and resilience.
Innovation Solution
A golf ball core composition incorporating a base rubber, α,β-unsaturated carboxylic acid or its metal salt, a crosslinking initiator, and a hindered phenol compound, with specific mole ratios and amounts to enhance durability and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rubber composition is used for the core, then the core can be easily manufactured, but the durability and resilience are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ratio of hindered phenol compound to co-crosslinking agent (HF/B between 0.04 and 0.35) and optimizing the amounts of each component in the rubber composition. This quantitative parameter optimization enhances durability and resilience without fundamentally changing the manufacturing process or requiring complex additional steps.
2Strength
If the core hardness is increased to improve resilience, then the shot feel improves, but the compression characteristics deteriorate
Solution Approach 1:
The patent uses parameter changes by optimizing the HF/B ratio and component amounts to achieve the right balance of crosslinking density. This allows the core to maintain appropriate hardness for good shot feel while preserving compression characteristics through controlled chemical composition rather than simply increasing hardness.
Solution Approach 2:
The patent employs composite materials by combining base rubber with specific amounts of co-crosslinking agent and hindered phenol compound in defined ratios. This composite approach creates a multi-functional core material that simultaneously provides hardness, resilience, and proper compression characteristics that single-component materials cannot achieve.
3Reliability
If more crosslinking agent is added to improve resilience, then the core becomes harder, but the shot feel becomes too firm
Solution Approach 1:
The patent applies parameter changes by precisely controlling the HF/B ratio between 0.04 and 0.35, which optimizes the interaction between crosslinking agent and hindered phenol compound. This controlled parameter range ensures adequate resilience for performance while maintaining shot feel that is not overly firm, achieving a balanced playing characteristic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The core composition improves durability and resilience, providing better shot feel and resistance to deformation, while maintaining appropriate core hardness and compression characteristics.
Implementation Method 1
a core formed by vulcanizing a rubber composition containing a base rubber, a co-crosslinking agent and a crosslinking initiator
Implementation Method 2
the core is formed from a core rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator
Implementation Method 3
the core is formed from a core rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a hindered phenol compound
Data Source
AI summary
An object of the present invention is to provide a golf ball having excellent durability. The present invention provides a golf ball comprising a core and at least one cover layer covering the core, wherein the core is formed from a core rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a hindered phenol compound, and (b) the co-crosslinking agent and (d) the hindered phenol compound are blended in the core rubber composition such that the following expression (1) is satisfied:0.04≤HF/B≤0.35 (1)in the formula (1), HF=a number of OH functional group in one molecule of (d) the hindered phenol compound×an amount of (d) the hindered phenol compound (mole) with respect to 100 parts by mass of (a) the base rubber, and B=an amount of (b) the co-crosslinking agent (mole) with respect to 100 parts by mass of (a) the base rubber.