Polyamide-based composition for pipes containing oil or gas
AssigneeArkema France
InventorsThierry Briffaud, Philippe Blondel, Patrick Dang, Francois Fernagut, Jean-Jacques Flat, Benjamin Saillard
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Abstract
The invention relates to the use of a composition comprising at least one polyamide, of which at least one is a semicrystalline copolyamide comprising at least one minor motif resulting from the polycondensation of: at least one diamine with at least one polymerised fatty acid, in particular a fatty acid dimer; or at least one diamine dimer with at least one carboxylic acid; or at least one amino acid dimer; or mixtures of same, as a sealing coating in a pipe containing oil or gas, said pipe being used in the operation of offshore oil or gas deposits.
Claims29
A leaktight layer in a pipe containing oil or gas, the pipe being configured for use in the exploitation of undersea oil or gas deposits, the leaktight layer comprising a composition comprising at least one polyamide, of which at least one of said polyamide is a semicrystalline copolyamide comprising at least one minor unit derived from the polycondensation:
- of at least one diamine with at least one polymerized fatty acid, or
- of at least one diamine dimer with at least one dicarboxylic acid, or
- of at least one amino acid dimer,
- or mixtures thereof,
- wherein the mole proportion of said at least one minor unit in the semicrystalline copolyamide is at least 1% relative to the sum of all the units of said copolyamide.
A leaktight layer in a pipe containing oil or gas, the pipe being configured for use in the exploitation of undersea oil or gas deposits, the leaktight layer comprising a composition comprising at least one polyamide, of which at least one of said polyamide is a semicrystalline copolyamide comprising at least one minor unit derived from the polycondensation:
- of at least one diamine with at least one polymerized fatty acid, or
- of at least one diamine dimer with at least one dicarboxylic acid, or
- of at least one amino acid dimer, or
- mixtures thereof,
- in which the copolyamide is an aliphatic copolyamide.
A leaktight layer in a pipe containing oil or gas, the pipe being configured for use in the exploitation of undersea oil or gas deposits, the leaktight layer comprising a composition comprising at least one polyamide, of which at least one of said polyamide is a semicrystalline copolyamide comprising at least one minor unit derived from the polycondensation:
- of at least one diamine with at least one polymerized fatty acid, or
- of at least one diamine dimer with at least one dicarboxylic acid, or
- of at least one amino acid dimer, or
- mixtures thereof,
- in which at least one of the other units of said copolyamide is a unit A chosen from a unit obtained from a C6 to C12 amino acid, a unit obtained from a C6 to C12 lactam, and a unit corresponding to the formula (Ca aliphatic diamine).(Cb aliphatic diacid), with a representing the number of carbon atoms in the diamine and b representing the number of carbon atoms in the diacid, a and b each being between 4 and 22,
- in which the unit A is a unit obtained from the polycondensation of a lactam or an amino acid.
A leaktight layer in a pipe containing oil or gas, the pipe being configured for use in the exploitation of undersea oil or gas deposits, the leaktight layer comprising a composition comprising at least one polyamide, of which at least one of said polyamide is a semicrystalline copolyamide comprising at least one minor unit derived from the polycondensation:
- of at least one diamine with at least one polymerized fatty acid, or
- of at least one diamine dimer with at least one dicarboxylic acid, or
- of at least one amino acid dimer, or
- mixtures thereof,
- in which at least one of the other units of said copolyamide is a unit A chosen from a unit obtained from a C6 to C12 amino acid, a unit obtained from a C6 to C12 lactam, and a unit corresponding to the formula (Ca aliphatic diamine).(Cb aliphatic diacid), with a representing the number of carbon atoms in the diamine and b representing the number of carbon atoms in the diacid, a and b each being between 4 and 22,
- in which the unit A is a unit obtained from the polycondensation of a Ca aliphatic diamine and a Cb aliphatic dicarboxylic acid.
A composition comprising, on a weight basis:
- 70% to 96% of a semicrystalline copolyamide, optionally comprising from 0 to 70% by weight of another polyamide,
- from 2% to 10% by weight of a polyolefin comprising an epoxy, anhydride or acid function, introduced by grafting or by copolymerization,
- from 3% to 20% by weight of a plasticizer, and
- from 0 to 10% by weight of an additive,
- wherein the semicrystalline copolyamide comprises at least one minor unit derived from the polycondensation:
- of at least one diamine with at least one polymerized fatty acid, or
- of at least one diamine dimer with at least one dicarboxylic acid, or
- of at least one amino acid dimer,
- or mixtures thereof,
- wherein the mole proportion of said at least one minor unit in the semicrystalline copolyamide is at least 1% relative to the sum of all the units of said copolyamide.
Dependencies are inferred from the claim text.