Non-curable SIS Adhesive for Touch Screen Panels
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Solution Overview
Problem
Existing adhesive compositions for touch screen panels, particularly acrylic-based ones, face issues with poor wetting properties and limited application fields due to the requirement of a crosslinking process, while rubber-based adhesives have good wetting but lack variety and require complex processing.
Innovation Solution
A non-curable rubber-based adhesive composition containing styrene-isoprene-styrene (SIS) rubber with a weight average molecular weight of 5,000 to 200,000 and 15 wt% to 30 wt% styrene content, which forms an adhesive layer with 0% curing degree, providing excellent wetting properties and a predetermined release peeling force without the need for adhesion promoters or curing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic-based adhesive composition is used, then the adhesive layer has good durability after curing, but the wetting property to base film is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using rubber-based adhesive containing specific compounds (化合物的含量为10-40 wt%) instead of conventional acrylic-based adhesive, achieving both good wetting property and durability without curing process
Solution Approach 2:
The patent uses a composite adhesive system combining rubber-based adhesive with specific compounds to achieve synergistic effects, where the rubber base provides durability and the added compounds enhance wetting property, creating a material that overcomes the limitations of single-component adhesives
2Object-generated harmful factors
If rubber-based adhesive composition is used, then the wetting property is good, but the number of application fields is small and crosslinking process is required
Solution Approach 1:
The patent modifies the adhesive composition by adding specific compounds to the rubber-based adhesive, changing its chemical parameters to enable non-curing while maintaining good wetting property, thereby expanding applicability to fields requiring simple processing
Solution Approach 2:
The patent extracts and eliminates the curing process requirement from the adhesive application by using rubber-based adhesive that does not require crosslinking, simplifying the manufacturing process and expanding the range of applicable fields to include those with simple processing requirements
3Object-generated harmful factors
If adhesion promoter is added to improve wetting property, then the wetting property is enhanced, but the adhesive composition becomes more complex and requires curing
Solution Approach 1:
The patent changes the fundamental approach by using rubber-based adhesive with specific compound additions rather than conventional acrylic adhesive with adhesion promoters, achieving enhanced wetting property through composition modification rather than additive complexity
Solution Approach 2:
The rubber-based adhesive formulation inherently provides both adhesion and wetting properties through its base composition and added compounds, eliminating the need for separate adhesion promoters and curing agents that would increase system complexity
4Reliability
If crosslinking process is implemented to improve durability, then the adhesive durability is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent removes the crosslinking process from the manufacturing sequence by selecting rubber-based adhesive that achieves durability through its inherent composition rather than through crosslinking, thereby simplifying the manufacturing process while maintaining adhesive durability
Solution Approach 2:
The patent changes the adhesive chemistry from acrylic-based requiring crosslinking to rubber-based providing durability through composition, fundamentally altering the durability mechanism to eliminate the need for complex crosslinking processes
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 non-curable adhesive composition maintains durability and wetting properties on touch screen panels, ensuring a suitable release peeling force and preventing residue formation during high-temperature peeling, enhancing the applicability and performance of touch screen panels.
Implementation Method 1
have excellent wetting property to the base film
Implementation Method 2
the adhesive is a material having viscoelastic property which is capable of strongly adhering the products
Data Source
Figure 1~2
AI summary
The present invention relates to a non-curable rubber-based adhesive composition for a touch screen panel, containing styrene-isoprene-styrene (SIS) rubber, and a non-curable rubber-based adhesive film for a touch screen panel, using the same.