Polyurethane Golf Ball Adhesion via Urethane Polyol Resin
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Solution Overview
Problem
Existing golf ball technologies face issues with low adhesion between ionomer resin and polyurethane components, leading to reduced durability, especially when the polyurethane cover is thin, resulting in compromised resilience and durability.
Innovation Solution
A golf ball design incorporating a polyurethane envelope layer adhered with an adhesive resin composition containing a urethane polyol, epoxy resin, and a polyamine compound, with a urethane polyol content of 5 mass % or more and less than 40 mass %, enhancing adhesion between the polyurethane and adjacent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is formed between the core and cover, then adhesion between layers is improved, but the gel fraction of the adhesive must be controlled within a specific range (40-80%) to maintain both adhesion and durability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the gel fraction of the adhesive within the range of 40-80%. This parameter control resolves the contradiction by finding the optimal range that provides both sufficient adhesion strength and long-term durability. The gel fraction is a critical parameter that balances the adhesive's initial bonding capability with its long-term structural stability.
Solution Approach 2:
The patent uses composite materials by combining the adhesive (with controlled gel fraction) with the ionomer resin intermediate layer and polyurethane cover. The adhesive layer acts as a composite interface that bridges the two different materials, resolving the adhesion-durability contradiction through material composition optimization.
2Speed
If the cover thickness is reduced to improve aerodynamics, then flight performance is improved, but durability is significantly lowered
Solution Approach 1:
The patent introduces an intermediary adhesive layer between the core and the thin polyurethane cover. This intermediary component compensates for the reduced durability caused by thinning the cover, allowing the cover to be made thinner for aerodynamic performance while the adhesive layer provides the necessary structural support and durability.
Solution Approach 2:
The patent creates a composite structure with the thin polyurethane cover, adhesive layer, and ionomer resin intermediate layer. This composite construction allows the cover to be thin for aerodynamics while the composite structure as a whole maintains durability through the reinforced adhesive bonding.
3Reliability
If a polyurethane cover is used to improve abrasion resistance, then durability is improved, but adhesion to the ionomer resin intermediate layer becomes insufficient
Solution Approach 1:
The patent uses the adhesive layer as an intermediary between the polyurethane cover and the ionomer resin intermediate layer. This intermediary component is specifically designed to bond well with both materials, resolving the adhesion problem while maintaining the durability and abrasion resistance benefits of the polyurethane cover.
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 improved adhesion significantly enhances the durability of the golf ball by ensuring better bonding between the polyurethane envelope layer and adjacent layers, resulting in improved resilience and abrasion resistance.
Implementation Method 1
an adhesive layer formed from an adhesive and positioned between the first layer and the second layer, wherein a base polymer of the adhesive is a two-component curing type epoxy resin obtained by curing a bisphenol A type epoxy resin with a curing agent including a polyamine compound
Data Source
AI summary
An object of the present invention is to provide a golf ball showing improved durability by improving adhesion to a constituent member comprising a polyurethane in the golf ball. The present invention provides a golf ball comprising a center and n envelope layers (n is a natural number of 1 or more) covering the center, wherein at least one envelope layer is a polyurethane envelope layer comprising a polyurethane as a principal component, and the polyurethane envelope layer and a constituent member adjacent to the polyurethane envelope layer are adhered with an adhesive resin composition, and wherein the adhesive resin composition comprises a base material including a urethane polyol and an epoxy resin, and a curing agent including a polyamine compound, and a content of the urethane polyol in the base material is 5 mass % or more and less than 40 mass %.