Multi-layer tubing assembly for fluid and vapor handling systems

A multi-layer hose comprising:

• an extruded innermost semi-conductive layer of fluoropolymer;
• an inner permeation-resistant layer of fluoropolymer coextruded around said innermost layer;
• an adhesive layer co-extruded around said inner layer, said adhesive layer comprised of a polymer alloy having a multi-phase morphology wherein a first phase is miscible with said fluoropolymer for forming said inner permeation-resistant layer and a second phase is miscible with a polymer chemically dissimilar from fluoropolymer;
• and
• an outer layer of said polymer chemically dissimilar from fluoropolymer coextruded around said adhesive layer;
• wherein said adhesive layer comprises at least 25% volume fraction of said first phase and at least 25% volume fraction of said second phase.

A multi-layer tubing assembly comprising:

• an extruded innermost semi-conductive layer of fluoropolymer;
• an inner permeation-resistant layer of fluoropolymer coextruded around said innermost layer;
• an adhesive layer co-extruded around said inner permeation-resistant layer, said adhesive layer comprised of a polymer alloy having a multi-phase morphology wherein one phase is miscible with said fluoropolymer for forming said inner permeation-resistant layer and another phase miscible with a polymer chemically dissimilar from fluoropolymer;
• and
• an outer layer of said polymer chemically dissimilar from fluoropolymer coextruded around said adhesive layer;
• wherein said multi-phase polymer comprises 0.5% to 20% by weight compatibilizers and rheology modifiers.

A multi-layer tubing assembly comprising:

• an extruded inner permeation-resistant layer of fluoropolymer;
• an adhesive layer co-extruded around said inner layer, said adhesive layer comprised of a polymer alloy having a multi-phase morphology wherein one phase is miscible with said fluoropolymer and another phase miscible with a polymer chemically dissimilar from fluoropolymer;
• and
• an outer layer of said polymer chemically dissimilar from fluoropolymer coextruded around said adhesive layer;
• wherein said multi-phase polymer comprises 0.5% to 20% by weight compatibilizers and rheology modifiers.