Low permeation type C air conditioning hose
AssigneeDanfoss Power Solutions II Technology A/S
InventorsAaron David Clark, Gina Clark, Colleen Marie Hathaway
Life of this patent
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Abstract
An improved Type C air conditioning hose is provided that meets or exceeds SAE J2064 and J3062 requirements, offers good flexibility and fracture resistance, and exhibits improved permeation ratings for refrigerants including R134a and R1234yf. The multilayer type C barrier air conditioning hose includes an inner elastomeric tube layer capable of direct bonding to plastic without an intervening adhesive. The inner elastomeric layer is prepared from a first elastomeric composition comprising a blend of an ethylene propylene diene terpolymer rubber (EPDM) and a chloroprene rubber (CR), phenylenedimaleimide, and a maleated compound.
Claims28
A hose, comprising a multiplicity of layers including:
- an innermost elastomeric layer directly bonded to a polyamide (PA) layer without an intervening adhesive,
- wherein the innermost elastomeric layer is prepared from a first elastomeric composition comprising a blend of an ethylene propylene diene terpolymer rubber (EPDM) and a chloroprene rubber (CR), a phenylenedimaleimide, and a maleated compound.
A method of making a hose, comprising:
- blending a first composition comprising a blend of an ethylene propylene diene terpolymer rubber (EPDM) and a chloroprene rubber (CR), a malcated compound, and phenylenedimalemide and extruding the first composition over a mandrel to form an inner elastomeric layer;
- applying a thermoplastic barrier layer composition comprising a polyamide over the inner elastomeric layer without an intervening adhesive;
- extruding an elastomeric backing layer over the polyamide layer;
- applying a textile reinforcement layer over the rubber backing layer;
- extruding an elastomeric cover layer over the reinforcement layer to form a green hose;
- vulcanizing the green hose to form a cured hose;
- and
- expelling the cured hose from the mandrel.
Dependencies are inferred from the claim text.