A hose including at least one permeation resistant layer, an elastomeric layer overlaying each at least one permeation resisting layer, at least one reinforcement layer overlaying an elastomeric layer, and a cover layer overlaying the at least one reinforcement layer, wherein the at least one permeation resistant layer includes a plurality of sublayers of at least two different thermoplastics wherein the sublayers have a thickness of less than 2500 nanometers.
1. A hose comprising:
at least one permeation resistant layer configured to resist the permeation of a refrigerant;
an elastomeric layer overlaying the at least one permeation resisting layer;
at least one reinforcement layer overlaying the elastomeric layer; and
a cover layer overlaying the at least one reinforcement layer,
wherein the at least one permeation resistant layer is comprised of a plurality of sublayers of first and second thermoplastics in a weight ratio ranging from 5:1 to 1:5, the first thermoplastic is a liquid crystal polymer, and each of the sublayers has a thickness of less than 2500 nanometers.
2. The hose of claim 1 wherein the thickness is less than 1000 nanometers.
3. The hose of claim 1 wherein the thickness is less than 500 nanometers.
4. The hose of claim 1 wherein the thickness is less than 250 nanometers.
5. The hose of claim 1 wherein the second thermoplastic is selected from the group consisting of high density polyethylene (HDPE), ultrahigh molecular weight polyethylene (UHMWPE), polypropylene (PP), and ethylene propylene copolymer thermoplastic resin; nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12), nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6/66), nylon 6/66/610 copolymer (N6/66/610), nylon MXD6 (MXD6), nylon 6T, nylon 6/6T copolymer, nylon 66/PP copolymer, and nylon 66/PPS copolymer; polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PU), PET/PET copolymer, polyacrylate (PAR), polybutylenenaphthalate (PB N), polyoxyalkylenediimidate/polybutyrateterephthalate copolymer, and other aromatic polyesters; polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile/styrene copolymer (AS), methacrylonitrile/styrene copolymer, methacrylonitrile/styrene/butadiene copolymer; polymethacrylate thermoplastic resins such as polymethyl methacrylate (PMMA), and polyethylmethacrylate; vinly acetate (EVA), polyvinylalcohol (PVA), vinylalcohol/ethylene copolymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), vinyl chloride/vinylidene chloride copolymer, and vinylidene chloride/methylacrylate copolymer; cellulose acetate, cellulose acetate butyrate; polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoroethylene (PCTFE), and tetrachloroethylene/ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene/vinylidene fluoride terpolymer (THV); and aromatic polyimide (Pl).
6. The hose of claim 1 wherein one of the sublayers is an innermost layer of the hose.
7. The hose of claim 1 further comprising:
another elastomeric layer radially inside of the at least one permeation resistant layer.
8. The hose of claim 1 wherein the weight ratio ranges from 2:1 to 1:2.
9. The hose of claim 1 wherein:
the permeation resistant layer further contains a particulate selected from the group consisting of clay and mica.