Biosourced gelling polyamides

A method for preparing a polyamide compound of formula (1)

• wherein
• A1 represents an alkyl radical, linear or branched, comprising from 2 to 40 carbon atoms, optionally from 2 to 12 carbon atoms, said radical optionally comprising one or more unsaturations, being optionally interrupted by at least one heteroatom selected from O, N and S, and being optionally substituted by at least one —OAlk substituent, Alk representing an alkyl group comprising from 1 to 10 carbon atoms;
• A2 represents an alkyl radical, linear or branched, comprising from 2 to 30 carbon atoms, optionally from 5 to 22 carbon atoms, said radical optionally comprising one or more unsaturations, and being optionally substituted by at least one —OAlk substituent, Alk representing an alkyl group comprising from 1 to 10 carbon atoms;
• l and m represent, independently of each other, an integer from 1 to 20, optionally from 1 to 10, the sum l+m optionally being from 2 to 20;
• n is an integer from 1 to 20, optionally from 2 to 8;
• j is an integer from 1 to 10, optionally from 1 to 3;
• X represents an alkyl radical, linear or branched, comprising from 2 to 60 carbon atoms, optionally 16 to 45 carbon atoms;
• and
• Y represents an alkyl radical, linear or branched, comprising from 3 to 35 carbon atoms, optionally from 6 to 18 carbon atoms,
• comprising the following steps:
• step 1) Preparing preparing a polyamide precursor by functionalizing a diacid of formula (2) by a diamine of formula (3) to obtain a diamine polyamide of formula (4):
• wherein j, X and Y are as defined above;
• step 2) modifying a diacid polyester of formula (5)
• by adding the diamine polyamide of formula (4)
• wherein A1, A2, X, Y, l, m, and j are as defined above,
• leading to the polyamide of formula (1) above.

A polyamide compound of formula (7)

• wherein:
• A1 represents an alkyl radical, linear or branched, comprising from 2 to 40 carbon atoms, optionally from 2 to 12 carbon atoms, said radical optionally comprising one or more unsaturations, being optionally interrupted by at least one heteroatom selected from O, N and S, and being optionally substituted by at least one —OAlk substituent, Alk representing an alkyl group comprising from 1 to 10 carbon atoms;
• A2 represents an alkyl radical, linear or branched, comprising from 2 to 30 carbon atoms, optionally from 5 to 22 carbon atoms, said radical optionally comprising one or more unsaturations, and being optionally substituted by at least one —OAlk substituent, Alk representing an alkyl group comprising from 1 to 10 carbon atoms;
• l and m represent, independently of each other, an integer from 1 to 20, optionally from 1 to 10, the sum l+m optionally being from 2 to 20;
• n is an integer from 1 to 20, optionally from 1 to 8;
• j is an integer from 1 to 10, optionally from 1 to 3;
• k is an integer from 2 to 60, optionally from 8 to 40;
• X represents an alkyl radical, linear or branched, comprising from 2 to 60 carbon atoms, optionally 16 to 45 carbon atoms, said radical optionally comprising one or more unsaturations;
• and
• Y represents an alkyl radical, linear or branched, comprising from 3 to 35 carbon atoms, optionally from 6 to 18 carbon atoms.