Polyamide, preparation process and uses
View Patent ↗The present invention relates to a novel polyamide synthesized from biobased monomers. The novel polyamide comprises the repeat unit of following formula (I). The present invention also relates to the process for the preparation of said polyamide, to its uses and to articles and compositions comprising said polyamide.
1. A polyamide comprising the repeat unit of following formula I:
wherein the symbol * denotes an asymmetric carbon, and
wherein the polyamide is a copolymer comprising other repeat units different from the unit of formula I, said repeat units different from the unit of formula I resulting from comonomers.
2. The polyamide according to claim 1 , wherein the copolymer comprises 0.5 to 10 mol % of repeat unit of formula I, calculated on the total amount of monomers introduced for the preparation of the copolymer.
3. The polyamide according to claim 1 , wherein the copolymer is selected from the group consisting of: PA THF/6, PA THF/11, PA THF/12, PA THF/66, and PA THF/66/6.
4. A process for the preparation of the polyamide according to claim 1 , the process comprising a polycondensation reaction between at least two identical or different monomers corresponding to the following formula II, or salt thereof, or to the following formula III:
R 1 is a hydrogen atom or a group of formula —C(═O)R′ with R′ being an alkyl group having from 1 to 4 carbon atoms,
R 2 is a chlorine atom or a group of formula —OR″ with R″ being a hydrogen atom or a hydrocarbon group;
in the presence of other comonomers.
5. The process according to claim 4 , wherein R 1 is a hydrogen atom and R 2 is an —OR″ group with R″ being a hydrogen atom.
6. The process according to claim 4 , R 1 is a hydrogen atom and R 2 is an —OR″ group with R″ being a linear or branched alkyl group comprising from 1 to 4 carbon atoms.
7. The process according to claim 6 , wherein R″ is selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl and isobutyl.
8. The process according to claim 4 , wherein at least one of the monomers of formula II or III is biobased according to the standard ASTM 06866.
9. The process according to claim 4 , wherein at least one of the monomers of formula II is in the form of a salt.
10. A process for the preparation of articles, the process selected from the group consisting of molding, injection molding, blow-molding, extruding and spinning the polyamide according to claim 1 .
11. An article obtained from the polyamide according to claim 1 , said article being selected from the group consisting of a molded part, extruded part, yarn, fiber, filament, and film.
12. A composition comprising at least the polyamide according to claim 1 and optionally a reinforcing filler and/or an additive.
13. The polyamide according to claim 1 , wherein the comonomers are selected from the group consisting of dicarboxylic acids, diamines, amino acids, amino esters and lactams.
14. The process according to claim 4 , wherein R″ is an alkyl group having from 1 to 4 carbon atoms.