Golf Ball Resin Composition Modulus Optimization
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Solution Overview
Problem
Cured rubber compositions used for golf ball cores lack thermoplasticity, making them non-recyclable and difficult to mold into a soft, resilient material, which is essential for achieving excellent shot feeling and resilience in golf balls.
Innovation Solution
A golf ball resin composition characterized by a specific ratio of storage modulus E′ and loss modulus E″, measured at 12° C. and 10 Hz, which enhances resilience and hardness, comprising binary, ionomer, and ternary copolymers blended with metal salts of fatty acids to improve moldability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cured rubber compositions are used for golf ball cores, then resilience and shot feeling are improved, but thermoplasticity is lost making the material non-recyclable and difficult to mold
Solution Approach 1:
The patent changes the chemical and physical parameters of the resin composition by controlling the acid content (3-15 wt%), melt flow rate (5-100 g/10min), and molecular structure of the copolymer. These parameter changes enable the material to achieve both high resilience (coefficient of restitution ≥0.80) and good moldability through injection molding, resolving the contradiction between resilience and ease of manufacture.
2Length of moving object
If ionomer resins with high stiffness are used, then flight distance is improved, but shot feeling and softness deteriorate
Solution Approach 1:
The patent optimizes the acid content parameter to 3-15 wt% and controls the melt flow rate to 5-100 g/10min, creating a resin composition with balanced mechanical properties. This achieves both the high stiffness needed for flight distance and the appropriate softness for shot feeling, resolving the contradiction between flight distance and shot feeling.
Solution Approach 2:
The patent uses a composite resin composition comprising a specific copolymer with controlled acid content and melt flow rate, combining the benefits of stiffness for distance and softness for shot feeling that cannot be achieved with single-component ionomer resins alone.
Data Source
AI summary
An object of the present invention is to provide a golf ball resin composition excellent in resilience. Another object of the present invention is to provide a golf ball excellent in a shot feeling and resilience. The golf ball resin composition of the present invention is characterized in that a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfy a following expression;log(E′/E″2)≧−6.08when measured at the conditions of the temperature of 12° C., the oscillation frequency of 10 Hz, and a strain of 0.05% in a tensile mode using a dynamic viscoelasticity measuring apparatus.