Patent ID: 9664312
Date: 2017-05-30
CPC Classifications: B32B,F16L,Y10T

Claim:
1. A multilayer hose for compressed air, having only 3 layers, in this order: an outer layer (1) consisting of polyamide, and optionally a plasticizer, an impact modifier or a catalyzed, different polyamide, an intermediate layer (2) consisting of ethylene copolymer(s) or propylene copolymer(s) having a flexural modulus of less than 500 MPa, and an inner layer (3) of a polymer having a flexural modulus of greater than 1100 MPa, the inner layer (3) being in contact with compressed air, wherein said inner layer polymer (3) is polycarbonate (PC), polyphenyene sulfide (PPS), polyphenylene oxide (PPO) or an aromatic polyamide or a semiaromatic polyamide, wherein the polyamide of the outer layer (1) is: PA11, PA12, a polyamide A corresponding to the formula X,Y/Z or 6,Y2/Z, in which: the ratios by weight Z/(X+Y+Z) and Z/(6+Y2+Z) being between 0 and 15%, or a semiaromatic polyamide B.