Composition made from polyamide MXD.10

Patent metadata

Field	Value
Publication number	US-9944794-B2
Application number	US-201414897556-A
Country	US
Kind code	B2
Filing date	Jun 2, 2014
Priority date	Jun 14, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

The invention concerns a composition comprising a first polyamide, a second polyamide, different from the first polyamide, and 0.1 to 5% by weight of carbonaceous nanofillers, in which: a) the first polyamide comprises a unit derived from the condensation of meta-xylylene diamine or from a mixture of meta-xylylene diamine and para-xylylene diamine with sebacic acid, said first polyamide having a melting temperature Tf 1 ; and b) the second polyamide has a melting temperature Tf 2 higher than or equal to Tf 1 −40° C. The invention also relates to a method for producing said composition and the use thereof for producing various items.

First claim

The invention claimed is:

1. A composition comprising a first polyimide, a second polyamide distinct from the first polyamide and from 0.1 to 1.5% by weight of carbon nanotubes, in which:
the first polyamide comprises a unit resulting from the condensation of meta-xylylenediamine or of a mixture of meta-xylylenediamine and para-xylylenediamine with sebacic acid, said first polyamide exhibiting a melting point Tf 1 ; and
the second polyamide exhibits a melting point Tf 2 of greater than or equal to Tf 1 −40° C.

2. The composition as claimed in claim 1 , in which the second polyamide exhibits a melting point Tf 2 such that Tf 1 −40° C.≤Tf 2 <Tf 1 +60° C. or in which the second polyamide is polyundecanamide.

3. The composition as claimed in claim 1 , in which the second polyamide is present in a proportion of 0.1 to 20% by weight, with respect to the sum of the first polyamide and of the second polyamide.

4. The composition as claimed in claim 1 , in which the first polyamide is a homopolyamide or a copolyamide, the molar proportion of units resulting from the condensation of meta-xylylenediamine or of a mixture of meta-xylylenediamine and para-xylylenediamine with sebacic add in said copolyamide being greater than or equal to 90%.

5. The composition as claimed in claim 1 , additionally comprising reinforcers, the proportion by weight of reinforcers in the composition being less than or equal to 70%.

6. The composition as claimed in claim 1 , wherein the composition exhibits a surface resistivity of greater than or equal to 10 10 Ω/sq, determined according to the standard ASTM D257.

7. A method, comprising using carbon nanotubes as nucleating agent for the crystallization of a composition comprising a first polyamide and a second polyamide distinct from the first polyamide, in which:
the first polyamide comprises a unit resulting from the condensation of meta-xylylenediamine or of a mixture of meta-xylylenediamine and para-xylylenediamine with sebacic acid, said first polyamide exhibiting a melting point Tf 1 ; and
the second polyamide exhibits a melting point Tf 2 of greater than or equal to Tf 1 −40° C., and

wherein the carbon nanotubes are used in an amount of 0.1 to 1.5% by weight based on the total weight of the composition.

8. The method as claimed in claim 7 , in which the second polyamide exhibits a melting point Tf 2 such that Th 1 −40° C.≤Tf 2 <Tf 1 +60° C. or in which the second polyamide is polyundecanamide.

9. The method as claimed in claim 7 , in which the second polyamide is present in a proportion of 0.1 to 20% by weight, with respect to the sum of the first polyamide and of the second polyamide.

10. The method as claimed in claim 7 , in which the first polyamide is a homopolyamide or a copolyamide, the molar proportion of units resulting from the condensation of meta-xylylenediamine or of a mixture of meta-xylylenediamine and para-xylylenediamine with sebacic acid in said copolyamide being greater than or equal to 90%.

11. The method as claimed in claim 7 , in which the composition additionally comprises reinforcers, the proportion by weight of reinforcers in the composition being less than or equal to 70%.

12. The method as claimed in claim 7 , in which the carbon nanotubes are used in the form of a powder of carbon nanotubes or in which the carbon nanotubes are used in a form incorporated in a masterbatch of the second polyamide.

13. A process for the preparation of a composition as claimed in claim 1 , comprising melt blending a masterbatch comprising the second polyamide and the carbon nanotubes with the first polyamide and, optionally, with reinforcers.

14. The process as claimed in claim 13 , comprising a preliminary stage of manufacturing the masterbatch by melt blending the second polyamide with the carbon nanotubes.

15. A process for the preparation of a composition as claimed in claim 1 , comprising melt blending the first polyamide with the second copolyamide and with the carbon nanotubes and, optionally, reinforcers, simultaneously.

16. The process as claimed in claim 13 , comprising cooling and crystallizing the composition.

17. A method, comprising using a composition as claimed in claim 1 to form a monolayer structure or at least one layer of a multilayer structure.

18. The method as claimed in claim 17 , in which the structure is in the form of fibers, of a film, of a pipe, of a hollow body or of an injection-molded part.

19. A process for manufacturing an object, comprising a stage of injection molding the composition as claimed in claim 1 .

20. An object manufactured from a composition as claimed in claim 1 .

21. The object as claimed in claim 20 , which is a mechanical part for transportation, an item intended for the construction industry, a household item, an electrical item, an electronic item, a medical item or a sports item.

22. The composition as claimed in claim 1 , wherein the second polyamide is polyamide 11 (PA 11).

23. The composition as claimed in claim 1 , which comprises 0.1 to 1.2% by weight of the carbon nanotubes.

24. The composition as claimed in claim 1 , wherein the carbon nanotubes have a mean diameter of 0.4 to 100 nm.

25. The composition as claimed in claim 1 , wherein the carbon nanotubes are not oxidized or functionalized.

Assignees

• Arkema France

Inventors

• Brule Benoit
• Chiquot Aude
• Decraemer Nadine
• Deyrail Yves
• Jeancolas Lionel

Classifications

• B29L2009/00

  Layered products · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• C08L77/06 Primary

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• B29K2077/00

  Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material · CPC title

• C08K3/04

  Carbon · CPC title