Patent ID: 9056957
Filing Date: 2015-06-16
Classification: C08J,C08L

Abstract:
1. An injection molded article produced by a process comprising preparing a coloured polymer composition by melt-mixing, the process comprising using a masterbatch, wherein the masterbatch consists of at least one pigment and at least one demoulding agent in compounding, wherein the demoulding agent is at least one selected from the group consisting of pentaerythritol tetrastearate, glycerol monostearate and stearyl stearate, wherein the pigment is a carbon-based pigment and the content of pigment in the masterbatch is from 40 to 60 wt. %, based on the total weight of the masterbatch, wherein the carbon-based pigment is selected from the group consisting of: a) carbon black; b) graphite; c) fullerene; d) graphene; e) activated charcoal; and f) carbon nanotubes wherein the process additionally comprises preparing the masterbatch by using a shear and mixing unit in a single-shaft extruder, multi-shaft extruder, internal mixer, co-kneader or a shear roller device, wherein the pigment is homogeneously distributed and present in finely dispersed form in the polymer composition, wherein the produced coloured polymer composition is a polycarbonate composition comprising a) from 40 to 99.96 wt. % of at least one thermoplastic polymer (a), wherein polymer (a) is at least one selected from the group consisting of aromatic polycarbonates and aromatic polyester carbonates, wherein the polymer has a weight average molecular weight of 15,000 to 80,000 g/mol and is a homopolycarbonate or copolycarbonate containing bisphenol A b) from 0.1 to 3 wt. % of at least one pigment component (b), c) from 0.1 to 3 wt. % of at least one demoulding agent (c) selected from the group consisting of pentaerythritol tetrastearate, glycerol monostearate and stearyl stearate, d) from 0 to 60 wt. % of one or more thermoplastic polyesters (d), e) from 0 to 40 wt. % of one or more elastomers (e) other than component f, f) from 0 to 40 wt. % of one or more optionally rubber-modified vinyl (co)polymers (f), and g) from 0 to 10 wt. % one or more further additives.