Polymer compositions comprising semi-aromatic polyamides and graphene materials

1. A polymer composition, comprising

A) from 10 to 99.9 wt. %, based on the weight of components A) and B), of a semi-aromatic polyamide,

B) a graphene material,

C) from 0 to 600 wt. %, based on the weight of said component A) of a polyamide different from said component A), and

D) from 0 to 65 wt. %, based on the weight of the composition, of a filler,

wherein the graphene material is not tubular.

2. The polymer composition in accordance with claim 1 , wherein the semi-aromatic polyamide comprises recurring units obtained by a polycondensation reaction between at least one aromatic diamine and at least one non-aromatic diacid or derivatives thereof and/or recurring units obtained by a polycondensation reaction between at least one aromatic diacid or derivatives thereof and at least one non-aromatic diamine.

3. The polymer composition in accordance with claim 2 , wherein the aromatic diamine is selected from the group consisting of m-phenylene diamine (MPD), p-phenylene diamine (PPD), 3,4′-diaminodiphenyl ether (3,4′-ODA), 4,4′-diaminodiphenyl ether (4,4′-ODA) and m-xylylenediamine (MXDA), and wherein the non-aromatic diacid is selected from the group consisting of oxalic acid (HOOC—COOH), malonic acid (HOOC—CH 2 —COOH), succinic acid [HOOC—(CH 2 ) 2 —COOH], glutaric acid [HOOC—(CH 2 ) 3 —COOH], 2,2-dimethyl-glutaric acid [HOOC—C(CH 3 ) 2 —(CH 2 ) 2 —COOH], adipic acid [HOOC—(CH 2 ) 4 —COOH], 2,4,4-trimethyl-adipic acid [HOOC—CH(CH 3 )—CH 2 —C(CH 3 ) 2 —CH 2 —COOH], pimelic acid [HOOC—(CH 2 ) 5 —COOH], suberic acid [HOOC—(CH 2 ) 6 —COOH], azelaic acid [HOOC—(CH 2 ) 7 —COOH], sebacic acid [HOOC—(CH 2 ) 8 —COOH], undecanedioic acid [HOOC—(CH 2 ) 9 —COOH], dodecanedioic acid [HOOC—(CH 2 ) 10 —COOH], tetradecanedioic acid [HOOC—(CH 2 ) 12 —COOH], and cycloaliphatic diacids comprising at least one carbocyclic ring with from 4 to 8 carbon atoms in the ring.

4. The polymer composition in accordance with claim 3 , wherein the aromatic diamine is m-xylylene diamine, and wherein the non-aromatic diacid is adipic acid.

5. The polymer composition in accordance with claim 3 , wherein the aromatic diamine is m-xylylene diamine, and wherein the non-aromatic diacid is sebacic acid.

6. The polymer composition in accordance with claim 1 , wherein the graphene material is a nano-graphene platelet.

7. The polymer composition in accordance with claim 6 , wherein the nano-graphene platelet has a stack thickness in the range of from 0.34 to 100 nm.

8. The polymer composition in accordance with claim 6 , wherein the nano-graphene platelet has an aspect ratio in the range of from 1 to 60,000.

9. The polymer composition in accordance with claim 6 , wherein the nano-graphene platelet has an oxygen content of less than 0.5% by weight.

10. The polymer composition in accordance with claim 6 , wherein the nano-graphene platelet has a specific surface area exceeding 6 m 2 /g.

11. The polymer composition in accordance with claim 1 , further comprising at least one alkylene oxide-containing organic substance S containing at least two alkylene oxide moieties of general formula —O-A—, wherein A in said general formula is a C 2 -C 10 -alkylene group.

12. The polymer composition in accordance with claim 1 , being free of any alkylene oxide-containing organic substance S containing at least two alkylene oxide moieties of general formula —O-A—, wherein A in said general formula is a C 2 -C 10 -alkylene group.

13. The polymer composition in accordance with claim 11 , comprising from 3 to 600 wt. %, based on the weight of said component A), of an aliphatic polyamide.

14. A polymer composition, comprising

A) from 10 to 99.9 wt. %, based on the weight of components A) and B), of a semi-aromatic polyamide,

B) a graphene material,

C) from 0 to 600 wt. %, based on the weight of said component A), of a polyamide different from said component A), and

D) from 0 to 65 wt. %, based on the weight of the composition, of a filler,

wherein the graphene material is a nano-graphene platelet having a specific surface area exceeding 100 m 2 /g.

15. The polymer composition in accordance with claim 14 , wherein the nano-graphene platelet has an oxygen content of less than 1% by weight.

16. The polymer composition in accordance with claim 15 , wherein the nano-graphene platelet has an oxygen content of less than 0.5% by weight.

17. The polymer composition in accordance with claim 14 , wherein the nano-graphene platelet has an oxygen content in the range of from 2 to 40 wt %.

18. The polymer composition in accordance with claim 14 , wherein the semi-aromatic polyamide comprises recurring units obtained by a polycondensation reaction between m-xylylene diamine and at least one non-aromatic diacid.

19. A polymer composition, comprising

A) from 10 to 99.9 wt. %, based on the weight of components A) and B), of a semi-aromatic polyamide,

B) a graphene material,

C) from 0 to 600 wt. %, based on the weight of said component A) of a polyamide different from said component A), and

D) from 0 to 65 wt. %, based on the weight of the composition, of a filler,

wherein the graphene material is a nano-graphene platelet having a specific surface area exceeding 6 m 2 /g and less than 40 m 2 /g.

20. The polymer composition in accordance with claim 19 , wherein the semi-aromatic polyamide comprises recurring units obtained by a polycondensation reaction between m-xylylene diamine and at least one non-aromatic diacid.