# US 12,007,061 B2 · Air brake tubing and compositions for making the same

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- Number: US 12,007,061 B2
- Document ID: US12007061B2
- Status: Granted
- Kind: B2
- Application number: 18/120,881
- Filed: 2023-03-13
- Published: 2023-09-07
- Granted: 2024-06-11
- Earliest claimed: 2012-09-24
- Assignees: Danfoss A/S
- Applicants: Danfoss A/S
- Inventors: Iani Manas-Zloczower; Brett William Schultz
- Web page: https://patentgrep.com/patent/US12007061B2

## CPC

- F16L 9/12: of plastics with or without reinforcement (F16L9/16 - F16L9/22 take precedence)
- B32B 1/08: Tubular products
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/22: using plasticisers
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- B60T 17/04: Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L)
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08L 75/08: from polyethers
- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- F16L 11/088: {comprising a combination of one or more layers of a helically wound cord or wire with one or more braided layers}
- B32B 2250/24: All layers being polymeric
- B32B 2264/102: Oxide or hydroxide
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2264/108: Carbon, e.g. graphite particles
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/536: Hardness
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/558: Impact strength, toughness
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Air brake tubing is provided having an air brake tube body comprising at least one layer formed from a composition comprising a copolyester, polyethylene terephthalate or polybutylene terephthalate; and a thermoplastic polyurethane.

## Claims

### Claim 1

A tubing comprising:
a tube body comprising at least one layer formed from a composition comprising
at least one of the group consisting of a copolyester, a polyethylene terephthalate and a polybutylene terephthalate; and
a thermoplastic polyurethane, wherein the tubing is capable of meeting the performance requirements of SAE J844, SAE J2547 and DOT FMVSS 106.

### Claim 2 (depends on 1)

The tubing of claim 1, wherein the composition further comprises polyamide.

### Claim 3 (depends on 1)

The tubing of claim 1, wherein the tubing has a mono-wall construction.

### Claim 4 (depends on 1)

The tubing of claim 1, wherein the tube body comprises reinforcement.

### Claim 5 (depends on 1)

The tubing of claim 1, wherein the tubing has multi-layer construction.

### Claim 6 (depends on 1)

The tubing of claim 1, wherein the composition comprises about 15-75 wt %, about 30-60 wt %, or about 40-55 wt % of the copolyester.

### Claim 7 (depends on 1)

The tubing of claim 1, wherein the composition comprises about 15-75 wt %, about 30-60 wt %, or about 40-55 wt % of the thermoplastic polyurethane.

### Claim 8 (depends on 2)

The tubing of claim 2, wherein the composition comprises about 0-50 wt %, about 0-20 wt %, about 0.1-20 wt %, about 1-15 wt %, or about 3-12 wt % of the polyamide.

### Claim 9

A tubing suitable for use in pneumatic or hydraulic applications, the tubing formed from a composition comprising about 15-75 wt %, about 30-60 wt %, or about 40-55 wt % of a copolyester, a polyethylene terephthalate, or a polybutylene terephthalate or combinations thereof; about 15-75 wt %, about 30-60 wt %, or about 40-55 wt % of a thermoplastic polyurethane; and about 0-50 wt % of a polyamide, wherein the tubing is capable of meeting the performance requirements of at least one of SAL J844, SAE J2547 and DOT FMVSS 106.

### Claim 10 (depends on 9)

The tubing of claim 9, a wherein the tubing has a mono-wall construction.

### Claim 11 (depends on 9)

The tubing of claim 9, wherein the tubing comprises reinforcement.

### Claim 12 (depends on 9)

The tubing of claim 9, wherein the composition comprises about 0-20 wt %, about 0.1-20 wt %, about 1-15 wt %, or about 3-12 wt % of the polyamide.

### Claim 13 (depends on 1)

The tubing of claim 1, wherein the composition is a blend, alloy or copolymer.

### Claim 14 (depends on 1)

The tubing of claim 1, wherein the compositions a blend, alloy or copolymer that further comprises a polyamide.

### Claim 15 (depends on 1)

The tubing of claim 1, wherein the copolyester, polyethylene terephthalate, or polybutylene terephthalate exhibits a durometer value in in a range of about 30D-801D, about 40D-74D, about 47D-74D about 55D-74D, or about 63D-74D on the Shore scale.

### Claim 16 (depends on 15)

The tubing of claim 15, wherein the copolyester comprises at least two different copolyesters having different durometer values.

### Claim 17 (depends on 1)

The tubing of claim 1, wherein the thermoplastic polyurethane exhibits a durometer value in a range of about 51D-74D, or about 601D-70D on the Shore scale.

### Claim 18 (depends on 2)

The tubing of claim 2, wherein the polyamide is selected from the group consisting of a PA612, PA6, PA12, PA66, PA610, PA1010, PA1012 PA11, PA12 or PA1212 polyamide.

### Claim 19 (depends on 18)

The tubing of claim 18, wherein the composition includes a plasticizer.