Multilayer Polyphenylene Sheet Adhesive-Free Lamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Poly(phenylene ether) based films used in electrical insulation applications face issues with hydrolysis of the adhesive layer due to high humidity and temperature exposure, and the lamination process adds cost to production, necessitating a multilayer sheet without an adhesive layer that maintains mechanical properties.
Innovation Solution
A multilayer sheet comprising a core layer with polyphenylene, polystyrene, and a hydrogenated block copolymer, and cap layers made of polypropylene, which eliminates the need for an adhesive layer by enhancing interlayer bonding strength and providing mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is used to bond polyphenylene ether layer and ultraviolet light shielding layer, then the layers can be laminated together, but the adhesive layer undergoes hydrolysis after long-term exposure to high humidity and high temperatures
Solution Approach 1:
The patent removes the adhesive layer entirely from the multilayer structure. By directly laminating the polyphenylene ether layer with the ultraviolet light shielding layer without an intermediate adhesive layer, the source of hydrolysis is eliminated, thereby improving long-term stability under high humidity and temperature conditions.
Solution Approach 2:
The patent merges the bonding function into the lamination process itself, using direct thermal lamination to bond layers together without requiring a separate adhesive material. This integration eliminates the adhesive layer that would otherwise be susceptible to hydrolysis.
2Ease of manufacture
If an adhesive layer is used to bond layers together, then the multilayer structure can be formed, but the lamination process adds additional cost to production
Solution Approach 1:
The patent extracts and removes the adhesive layer from the multilayer construction, thereby eliminating the need for separate adhesive application and bonding processes. This simplifies the overall production process and reduces manufacturing costs while maintaining layer bonding capability through direct thermal lamination.
Solution Approach 2:
The patent combines the layer bonding function directly into the lamination process, eliminating the need for a separate adhesive application step. This integration reduces process complexity and manufacturing costs while achieving the same structural outcome.
3Strength
If polyphenylene ether based films are used for electrical insulation, then desirable mechanical properties are achieved, but compatibility issues arise with ultraviolet light shielding layers
Solution Approach 1:
The patent removes the incompatible adhesive layer that acted as an interface between the polyphenylene ether layer and ultraviolet light shielding layer. By eliminating this intermediate layer, the patent achieves direct compatibility between the functional layers while preserving the mechanical properties of the polyphenylene ether base film.
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 solution provides a multilayer sheet with improved hydrothermal resistance and dimensional stability, reducing the risk of hydrolysis and eliminating the need for an adhesive layer, thus lowering production costs while maintaining mechanical properties.
Implementation Method 1
enhancing interlayer bonding strength
Implementation Method 2
co-extruding a core layer and a first cap layer
Data Source
AI summary
A multilayer sheet includes a core layer including a composition including about (60) to about (90) weight percent of polyphenylene, about (0) to about (20) weight percent of polystyrene, about (10) to about (20) weight percent of a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene, and optionally, a flame retardant additive; and a first cap layer disposed on a surface of the core layer, wherein the first cap layer includes polypropylene.