Composition of polyamides with low concentration of carboxamide groups and electrically conductive carbon

摘要

A polyamide composition comprising the following components: a) at least 40 parts by weight of a polyamide whose monomer units contain an arithmetic average of at least 7.5 carbon atoms, b) 0.1 to 15 parts by weight of at least one salt with a non-metallic cation, c) 0.1 to 25 parts by weight of at least one dispersant based on esters or amides and d) an electrically conductive carbon selected from the group of carbon black, graphite powder, carbon fibers, carbon nanotubes and/or graphene, in an amount which results in a specific surface resistance of the polymer composition to IEC 60167 of 10−1 to 1010Ω, e) 0 to 5 parts by weight of at least one metal salt, and optionally f) customary assistants and additives, where the polyamide of component a) is not a PA12 if carbon nanotubes are present as component d), and where the sum of the parts by weight of components a) to f) is 100, can be used for production of mouldings with improved electrical conductivity and improved surface quality.

主权项

1. A polyamide composition, comprising:
a) at least 40 parts by weight of a polyamide whose monomer units have an arithmetic average of 7.5 carbon atoms or more; b) from 0.1 to 15 parts by weight of at least one salt having a nonmetallic cation; c) from 0.1 to 25 parts by weight of at least one dispersant based on an ester or an amide; d) an electrically conductive carbon selected from the group consisting of carbon black, a graphite powder, a carbon fiber, a carbon nanotube and graphene, in an amount such that the polyamide composition has a specific surface resistance in accordance with IEC 60167 of from 10−1 to 1010Ω; e) from 0 to 5 parts by weight of at least one metal salt; and f) optionally one or more auxiliaries or additives, based on a total of 100 parts by weight of a) to f), wherein the polyamide of a) is not PA12 when the electrically conductive carbon of d) comprises a carbon nanotube, and the nonmetallic cation of b) consists of a quaternary nitrogen compound.