Insulating Multilayer Sheet for Solar Cell Modules

The patent applies composite materials by combining an electrically insulating resin film layer with an adhesive layer containing specific polymers (epoxy group-containing ethylene-based copolymer and ethylene-based copolymer). This composite structure simultaneously provides both insulating performance from the resin film layer and adhesion stability from the adhesive layer, resolving the contradiction between these two properties.

The insulating sheet is segmented into multiple functional layers: an electrically insulating resin film layer for providing insulation and an adhesive layer for providing adhesion stability. This segmentation allows each layer to specialize in one function, enabling the overall sheet to achieve both insulating performance and adhesion stability simultaneously.

The sheet is divided into distinct layers where the adhesive layer provides adhesion strength and the electrically insulating resin film layer provides insulating performance. This segmentation prevents the trade-off by assigning each function to a separate layer that does not compromise the other property.

The composite structure combines materials with different primary functions: the adhesive layer uses polymers optimized for bonding strength while the resin film layer uses materials optimized for electrical insulation. This composite approach allows both adhesion strength and insulating performance to be maximized simultaneously without compromise.