# US 9,040,135 B2 · Polyphenylsulfone-polytetrafluoroethylene blend for anti-wear tapes in flexible oil pipes

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- Number: US 9,040,135 B2
- Document ID: US9040135B2
- Status: Granted
- Kind: B2
- Application number: 13/883,711
- Filed: 2011-12-01
- Published: 2013-09-05
- Granted: 2015-05-26
- Earliest claimed: 2011-01-14
- Assignees: Evonik Röhm GmbH
- Applicants: Detlef Bumann; Albert Drexler; Ricardo Luiz Willemann
- Inventors: Detlef Bumann; Albert Drexler; Ricardo Luiz Willemann
- Web page: https://patentgrep.com/patent/US9040135B2

## CPC

- B29C 48/022: {characterised by the choice of material}
- B29C 48/0013: {Extrusion moulding in several steps, i.e. components merging outside the die (B29C48/15 takes precedence)}
- C08J 3/20: Compounding polymers with additives, e.g. colouring
- C08L 81/06: Polysulfones; Polyethersulfones
- F16L 57/06: against wear (F16L57/04 takes precedence)
- C08J 2381/06: Polysulfones; Polyethersulfones
- C08J 2427/18: Homopolymers or copolymers of tetrafluoroethylene
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1303: Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1359: Three or more layers [continuous layer]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to an improved blend of polyphenylsulfone (PPSU) and polytetrafluoroethylene (PTFE) for producing friction-reducing tapes (anti-wear tapes) used as a friction-reducing intermediate layer in flexible fluid pipes, e.g. oil pipes.

## Claims

### Claim 1

A process for producing a plastic product made of polyphenyl sulphone (PPSU) and polytetrafluoroethylene (PTFE), the process comprising:
first extruding by mixing a mixture comprising PPSU and PTFE in a first extruder at a temperature of from 340° C. to 390° C., thereby obtaining a pellet; and
second extruding by processing the pellet in a second extruder, thereby obtaining a plastic moulding,
wherein the mixture comprises the PTFE in an amount of from 4.0% to 6.0% by weight and the PPSU in an amount of from 94.0% to 96.0% by weight and the PTFE has a particle size smaller than 3 μm in an amount of from 8 to 12% by volume prior to the first extruding and the PTFE has a particle size smaller than 25 μm in an amount of at least 88% by volume prior to the first extruding.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the PTFE has a specific surface area of from 1.5 to 3.0 m2/g.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the mixture comprises the PTFE in an amount of from 4.5% to 5.5% by weight and the PPSU in an amount of from 95.5% to 94.5% by weight.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the first extruding is extruding by mixing the PPSU and the PTFE at a temperature of from 345 to 385° C. in the first extruder at an ambient pressure of from 500 to 700 mbar, at a rotation rate of from 220 to 270 min−1, at a screw temperature of from 340 to 390° C. and at a torque of from 50% to 80%, thereby obtaining the pellet, and the second extruding is extruding the pellet in a single-screw extruder, thereby obtaining a plastic moulding.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the second extruding is extruding the pellet at a screw temperature of from 345 to 390° C., thereby obtaining a plastic moulding.

### Claim 6 (depends on 1)

An anti-wear tape, comprising:
the plastic moulding obtained by the process according to claim 1.

### Claim 7 (depends on 6)

A pipe for fluids, comprising:
the anti-wear tape according to claim 6.