# US 2018/0320803 A1 · An unbonded flexible pipe > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320803 A1 - Document ID: US20180320803A1 - Status: Published application - Kind: A1 - Application number: 15/772,862 - Filed: 2016-11-01 - Published: 2018-11-08 - Earliest claimed: 2015-11-03 - Assignees: NATIONAL OILWELL VARCO DENMARK l/S - Applicants: National Oilwell Varco Denmark I/S - Inventors: Inger-Margrete Procida; Allan Boye Hansen - Web page: https://patentgrep.com/patent/US20180320803A1 ## CPC - F16L 11/081: {comprising one or more layers of a helically wound cord or wire (in combination with braided layers F16L11/088)} - B32B 1/00: Layered products having a non-planar shape - B32B 15/08: of synthetic resin - B32B 27/08: of synthetic resin - B32B 27/22: using plasticisers - B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - C08K 7/14: Glass - C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond} - C08L 23/12: Polypropene - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - E21B 17/01: Risers - B32B 2307/306: Resistant to heat - B32B 2307/544: Torsion strength; Torsion stiffness - B32B 2307/546: Flexural strength; Flexion stiffness - B32B 2307/732: Dimensional properties - B32B 2597/00: Tubular articles, e.g. hoses, pipes - C08L 2203/18: used for pipes - C08L 2205/02: containing two or more polymers of the same C08L -group - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2205/16: Fibres; Fibrils - 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 - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract Disclosed is an unbonded flexible pipe for subsea transportation of fluids. The pipe has a length and a centre axis and includes a plurality of layers including at least one polypropylene based layer including a modified polypropylene compound including: at least about 50% by weight of a base polypropylene (base PP) which consists of polypropylene including up to about 10% by weight of one or more co-monomers other than propylene, and at least about 1% by weight of a plastomer including a propylene and at least one co-monomer other than propylene. ## Claims ### Claim at position 1 1-32. (canceled) ### Claim 33 An unbonded flexible pipe for subsea transportation of fluids, the pipe has a length and a centre axis and comprises a plurality of layers comprising at least one polypropylene based layer comprising a modified polypropylene compound comprising: at least about 50% by weight of a base polypropylene (base PP) which consists of polypropylene comprising up to about 10% by weight of one or more co-monomers other than propylene, and at least about 1% by weight of a plastomer comprising a propylene and at least one co-monomer other than propylene. ### Claim 34 (depends on 33) The flexible pipe of claim 33, wherein the base pp comprises a PP homopolymer, a PP block co-polymer, a PP random co-polymer, any mixtures thereof and/or any combinations thereof. ### Claim 35 (depends on 33) The flexible pipe of claim 33, wherein the base pp comprises a random co-polymer comprising up to about 6% by weight of said co-monomer(s), such as from about 1 to about 5% by weight of said co-monomer(s), preferably said base PP comprises none or only one co-monomer. ### Claim 36 (depends on 33) The flexible pipe of claim 33, wherein the base PP comprises a propylene-ethylene co-polymer, preferably the base PP consists essentially of said propylene-ethylene co-polymer with up to about 5% by weight of ethylene. ### Claim 37 (depends on 33) The flexible pipe of claim 33, wherein the base PP has a Melt Flow Index (MFI) of from about 0.1 to about 8.0 g/10 min (2.16 kg/10 min at 230° C.). ### Claim 38 (depends on 33) The flexible pipe of claim 33, wherein the base PP has a tensile strength of at least about 12 MPa determined according to ASTM D638. ### Claim 39 (depends on 33) The flexible pipe of claim 33, wherein said modified polypropylene compound comprises at least about 60% by weight of said base PP, such as up to about 95% by weight of said base PP. ### Claim 40 (depends on 33) The flexible pipe of claim 33, wherein said plastomer is a propylene based plastomer comprising at least 50% by weight of polypropylene, preferably at least about 60% by weight of propylene, such as up to about 90% by weight of polypropylene. ### Claim 41 (depends on 33) The flexible pipe of claim 33, wherein said plastomer is a propylene based plastomer comprising at least one comonomer selected from C4 to C20 alpha olefins. ### Claim 42 (depends on 1) The flexible pipe of claim 1, wherein said plastomer is a propylene based plastomer comprising ethylene comonomer, preferably said plastomer comprises at least about 3% by weight of ethylene comonomer, such as from about 5% by weight to about 30% by weight of ethylene comonomer, such as from about 10% by weight to about 20% by weight of ethylene comonomer. ### Claim 43 (depends on 33) The flexible pipe of claim 33, wherein said plastomer has a MFI of from about 2.0 to about 15.0 g/10 min (2.16 kg/10 min at 190° C.). ### Claim 44 (depends on 33) The flexible pipe of claim 33, wherein said base PP has a tensile strength at yield which is larger than the tensile strength at yield of the plastomer, such as at least about 100% larger. ### Claim 45 (depends on 33) The flexible pipe of claim 33, wherein said modified polypropylene compound comprises from about 2% by weight to about 45% by weight of the plastomer, such as at least about 10% by weight, such as at least about 20% by weight. ### Claim 46 (depends on 33) The flexible pipe of claim 33, wherein the polypropylene based layer is an extruded layer, such as an extruded layer having a thickness of from about 0.1 mm to about 30 mm, such as from about 1 mm to about 20 mm. ### Claim 47 (depends on 33) The flexible pipe of claim 33, wherein the polypropylene based layer is a wound layer, such as a layer wound from tapes or bands having thickness from about 0.1 mm to about 10 mm. ### Claim 48 (depends on 33) The flexible pipe of claim 33, wherein the pipe comprises at least one metal based armour layer and at least one liquid impervious polymer layer and wherein a wound polypropylene based layer is applied between said metal based armour layer of the pipe and said liquid impervious polymer layer. ### Claim 49 (depends on 33) The flexible pipe of claim 33, wherein the pipe comprises at least one metal based armour layer and at least one liquid impervious polymer layer, said metal based armour layer is a carcass and the at least one liquid impervious polymer layer is a pressure sheath, a wound polypropylene based layer being positioned between said carcass and said pressure sheath. ### Claim 50 (depends on 33) The flexible pipe of claim 33, wherein the polypropylene based insulation layer forms an outermost polymer sheath of said pipe, preferably said outermost polymer sheath being liquid impervious. ### Claim 51 (depends on 33) The flexible pipe of claim 33, wherein polypropylene based insulation layer forms a pressure sheath of said pipe. ### Claim 52 (depends on 33) The flexible pipe of claim 33, wherein the polypropylene based insulation layer forms a thermal insulation layer of said pipe.