Flame Retardant Adhesive Sheet Without Flame Retardant Agents
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Solution Overview
Problem
Existing flame retardant adhesive tapes face challenges in maintaining both excellent flame retardant properties and adhesive strength, often requiring the use of flame retardant agents in the adhesive, which can harden the adhesive and reduce its effectiveness, or requiring partial application that lowers production yield and design integrity.
Innovation Solution
A flame retardant adhesive sheet with an adhesive agent layer on a flame retardant base material, where the adhesive agent contains an acrylic copolymer and a urethane resin, without any flame retardant agents, and has a specific thickness range to balance adhesive and flame retardant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flame retardant agent is blended in the adhesive agent, then flame retardant properties are improved, but the adhesive agent becomes hard and adhesive strength is lowered
Solution Approach 1:
The invention extracts the flame retardant agent from the adhesive agent and places it only in the base material. This separation allows the adhesive agent to maintain its softness and adhesive strength while the base material provides the flame retardant properties, thereby resolving the contradiction between flame retardancy and adhesive strength.
Solution Approach 2:
The invention applies different functional qualities to different parts of the adhesive sheet: the base material is designed with flame retardant properties while the adhesive agent layer is designed with optimal adhesive properties without flame retardant additives. This localized functional differentiation resolves the contradiction by allowing each layer to optimize its specific function.
2Reliability
If the adhesive agent layer thickness is reduced, then flame retardant properties are improved, but adhesive strength is lowered
Solution Approach 1:
The invention optimizes the thickness parameter of the adhesive agent layer to a specific range (0.6 μm or more per surface, total not more than 2.2 μm) that balances both flame retardant properties and adhesive strength. This precise parameter control resolves the contradiction by finding the optimal thickness where both requirements are satisfied simultaneously.
3Reliability
If adhesive agent is partially applied on the base material, then flame retardant properties are maintained, but production yield is lowered and design properties are impaired
Solution Approach 1:
The invention segments the adhesive sheet into two distinct functional layers: a flame retardant base material and an adhesive agent layer. This segmentation allows the entire surface to be covered with adhesive agent uniformly, improving production yield and design integrity while the base material maintains flame retardant properties throughout.
Data Source
AI summary
Provided is a flame retardant adhesive sheet having an adhesive agent layer on at least one surface of a base material, which even when the adhesive agent layer does not contain a flame retardant agent, has both excellent flame retardant properties and adhesive properties. The present invention is concerned with a flame retardant adhesive sheet including an adhesive agent layer on at least one surface of abase material, wherein the base material has flame retardant properties adapted to VTM-0 in a test according to the UL94 standard; a thickness per surface of the adhesive agent layer is 0.6 μm or more, and a total thickness of the adhesive agent layer is not more than 2.2 μm; the adhesive agent constituting the adhesive agent layer does not contain a flame retardant agent but contains (A) an acrylic copolymer and (B) a specified urethane resin.