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1. WO2020109258 - POLYMERIC COMPOSITIONS COMPRISING VDF POLYMERS AND GRAPHITE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

Claim 1

A polymeric composition, preferably a thermoplastic polymeric composition, comprising:

at least one vinylidene fluoride (VDF) polymer,

from 1 to 100 parts, preferably from 2 to 50 parts, more preferably from 2 to 30 parts, even more preferably from 3 to 20 parts by weight for 100 parts by weight of VDF polymer of a plurality of particles of graphite wherein:

said particles of graphite have a D90 particle size as measured with laser scattering of less than 50 pm, preferably from 2 to 30 pm more preferably from 2 to 20 pm, even more preferably from 2 to 10 pm and a BET specific surface of from 10 to 50 m2/g, preferably from 15 to 35 m2/g.

Claim 2

A polymeric composition according to claim 1 wherein said at least one VDF polymer is a thermoplastic polymer.

Claim 3

A tubular article comprising a composition according to claim 1 or 2.

Claim 4

A multilayer pipe wherein one of the layers is a tubular article according to claim 3.

Claim 5

A multilayer pipe according to claim 4 wherein a layer comprising at least one VDF polymer and being free of said graphite compound is adhered to at least a portion of the inner surface of said tubular article.

Claim 6

A multilayer pipe according to claim 4 or 5 which is a bonded or unbonded flexible riser for oil and gas extraction, said flexible riser comprising, from the inside to the outside, an inner metal carcass, a polymeric internal sealing sheath, a metallic tensile armour layer.

Claim 7

A flexible riser according to claim 6 wherein said polymeric internal sealing sheath comprises or is a tubular article according to claim 3.

Claim 8

A method for manufacturing a polymeric composition according to claim 1 or 2, the method comprising:

- providing at least one vinylidene fluoride (VDF) polymer

- providing from 1 to 100 parts, preferably from 2 to 50 parts, more

preferably from 2 to 30 parts, even more preferably from 3 to 20 parts by weight for 100 parts by weight of VDF polymer, of a plurality of particles of graphite, said plurality of particles having a D90 particle size as measured with laser scattering of less than 50 pm, preferably from 2 to 30 pm more preferably from 2 to 20 pm, even more preferably from 2 to 10 pm, and a BET specific surface of from 10 to 50 m2/g, preferably 15 to 35 m2/g.

- introducing said VDF polymer and said plurality of particles of graphite into an extruder, preferably a twin screw extruder,

- extruding said VDF polymer with said plurality of particles of graphite.

Claim 9

The method according to claim 8 further including the step of premixing said VDF polymer in divided form such as pellets, granules, powder, beads or fibers with said plurality of particles of graphite, so as to obtain a premix, and introducing the resulting premix to the main gate of said extruder.

Claim 10

A method of making a tubular article according to claim 3 comprising the step of extruding the polymeric composition according to claim 1 or 2 in the shape of a tube.

Claim 11

A method of making a tubular article according to claim 3, said method comprising the step of extruding the polymeric composition according to claim 1 or 2 in the shape of a film, layer or tape and subsequently wrapping said film layer or tape around a support having cylindrical shape, and then, optionally removing said support.

Claim 12

A method of making a tubular article according to claim 11 , further comprising the step of applying heat to said wrapped film, layer or tape so to at least partially melt it thus forming a sealed tubular article.

Claim 13

Use of a polymeric composition according to claim 1 or 2 or of a tubular article according to claim 3 or of a multilayer pipe according to claims 4-7 for transporting hydrocarbons.

Claim 14

Use of a polymeric composition according to claim 1 or 2 or of a tubular article according to claim 3 or of a multilayer pipe according to claims 4-7 in downhole operations.

Claim 15

Use of a polymeric composition according to claim 1 or 2 or of a tubular article according to claim 3 or of a multilayer pipe according to claims 4-7 in drilling operations.