Fuel Hose Interlaminar Adhesion via DBU Salt and HCl-Catcher

The patent introduces an intermediate layer between the NBR-PVC rubber layer and the THV resin layer. This intermediate layer acts as a mediator that is chemically compatible with both materials, enabling effective adhesion between the NBR-PVC layer and the THV layer while preserving the excellent fuel-permeation resistance, ozone resistance, and sour-gasoline resistance properties of the NBR-PVC material.

The patent creates a composite multi-layer structure consisting of NBR-PVC rubber layer, intermediate layer, and THV resin layer. Each layer is designed with specific material properties to achieve overall performance: the NBR-PVC layer provides fuel resistance, the intermediate layer provides adhesion, and the THV layer provides chemical compatibility, resulting in a composite structure that overcomes the limitations of individual materials.

Instead of relying solely on DBU salt addition to achieve adhesion between NBR-PVC and THV layers, the patent introduces a dedicated intermediate layer that serves as a mediator. This intermediate layer is specifically designed to be chemically compatible with both NBR-PVC and THV, providing reliable adhesion without requiring high concentrations of DBU salt that might compromise other material properties.

The patent changes the approach from modifying the NBR-PVC layer composition (adding DBU salt) to introducing a separate intermediate layer with specific compositional parameters. This parameter change allows optimization of adhesion properties independently from the fuel resistance properties of the NBR-PVC layer, achieving both goals simultaneously.