A laminated nylon air brake tubing is formed from outer and inner layers of nylon 11 or nylon 12 with inner layers of nylon 6. The nylon 6 and nylon 11 or 12 layers are adhered together by a tie layer. The tie layer is preferably a nylon 6-12 or an anhydride modified polyolefin. The air brake tubing
A laminated nylon air brake tubing is formed from outer and inner layers of nylon 11 or nylon 12 with inner layers of nylon 6. The nylon 6 and nylon 11 or 12 layers are adhered together by a tie layer. The tie layer is preferably a nylon 6-12 or an anhydride modified polyolefin. The air brake tubing has improved high temperature strength and low temperature impact resistance characteristics.
대표청구항▼
1. Air brake tubing comprising a first outermost layer adjoining a second layer, adjoining a third layer, adjoining a fourth layer adjoining a fifth layer; wherein said first layer is a nylon selected from the group consisting of nylon 11, nylon 12 and alloys thereof; and said second layer is a
1. Air brake tubing comprising a first outermost layer adjoining a second layer, adjoining a third layer, adjoining a fourth layer adjoining a fifth layer; wherein said first layer is a nylon selected from the group consisting of nylon 11, nylon 12 and alloys thereof; and said second layer is a tie layer compatible with said first and third layers, said second layer is selected from the group consisting of impact modified Nylon 6, Nylon 6-12, maleic anhydride modified polyolefin, and blends of Nylon 6-12 and maleic anhydride modified polyolefin thereof; said third layer comprises an impact modified nylon 6 having an ambient flex modulus of at least 40,000 and an elastic modulus at 230° F. of at least 10,000, a yield strength at 230° F. of at least 1,000 and an Izod impact strength of at least 70° of at least 0.7; and wherein said fourth layer is the same as said third layer and wherein said fifth layer is the same as said first layer. 2. Air brake tubing comprising an outermost first layer adjacent, a second layer adjacent, a third layer adjacent, a fourth layer adjacent, a fifth layer adjacent, a sixth layer, adjacent a seventh layer; wherein said first layer and seventh layers are independently selected from a group consisting of nylon 11, nylon 12 and alloys thereof; wherein said second layer and sixth layer independently are tie layers compatible with layers adjacent to said second and sixth layers, said tie layers are independently selected from the group consisting of Nylon 6-12 and blends with maleic anhydride modified polyolefin thereof; wherein said third layer and fifth layer independently comprise impact modified nylon 6, Nylon 6, Nylon 6-6, or blends thereof, said third and fifth layers have an ambient flex modulus of at least 40,000 and an elastic modulus at 230° F. of at least 10,000, a yield strength at 230° F. of at least 1,000 and an Izod impact strength of at least 70° of at least 0.7; and wherein said fourth layer comprises a polyester fiber reinforcing layer, said fibers having a weight between 500 and 1000 demier. 3. Air brake tubing comprising a plurality of nylon layers at least one of said nylon layers being impact modified nylon 6 having the following physical characteristics: ambient flex modulus of from 40,000 to 100,000 psi; elastic modulus at 230° F. of from 10,000 to 40,000 psi; yield strength at 230° F. of from 1,000 to 2,000 psi.
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