Resin Foam Sheet Composition for Silicone Adhesion and Flexibility
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Solution Overview
Problem
Conventional polyolefin-based resin foamed sheets face challenges in achieving both high shear holding power and flexibility when used as base materials for pressure-sensitive adhesive tapes, particularly with silicone-based adhesives, due to difficulties in adhesion and expansion ratio limitations.
Innovation Solution
A resin foamed sheet with specific surface contact angles (36 to 95°) and 25% compressive strength (250 kPa or less), featuring a closed cell structure, and a layered composition of polyolefin-based and acrylic resin layers, enhances adhesion and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyethylene resin is used in the foamed sheet, then flexibility is improved, but adhesion to silicone-based pressure-sensitive adhesives deteriorates
Solution Approach 1:
The invention uses a composite material consisting of polyethylene resin as the base material and a silane coupling agent as an additive. The silane coupling agent acts as a bridge between the polyethylene resin and silicone-based pressure-sensitive adhesives, improving adhesion while maintaining the flexibility provided by the polyethylene base material.
Solution Approach 2:
The invention changes the chemical parameters of the polyethylene resin by incorporating a silane coupling agent. This additive modifies the surface properties and chemical composition of the resin, enabling better adhesion to silicone-based adhesives without altering the fundamental flexibility characteristics of the polyethylene matrix.
2Reliability
If acrylic resin is used in the foamed sheet, then adhesion to silicone-based pressure-sensitive adhesives is improved, but expansion ratio and flexibility deteriorate
Solution Approach 1:
The invention extracts the adhesion-promoting function from the bulk resin composition and concentrates it in a specific additive component (silane coupling agent). This allows the base polyethylene resin to maintain its flexibility while the silane coupling agent provides the necessary adhesion properties when the foam sheet is bonded to silicone-based pressure-sensitive adhesives.
3Ease of operation
If expansion ratio is increased to improve flexibility, then shear holding power deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the foam sheet by adding a silane coupling agent. This chemical modification enables the foam sheet to maintain both high expansion ratio (for flexibility) and adequate shear holding power, as the silane coupling agent strengthens the interfacial bonding without compromising the cellular structure's flexibility.
Data Source
AI summary
A resin foamed sheet comprising a first resin layer that is a foamed resin layer, and a second resin layer provided on at least one surface of the first resin layer, the second resin layer being either a foamed resin layer or a resin film layer, wherein at least one surface of the resin foamed sheet has a contact angle of 36 to 95°, and the resin foamed sheet has a 25% compressive strength of 250 kPa or less.