Coloration properties and chemo‐rheological characterization of a dioxazine pigment‐based monodispersed masterbatch

Abstract

A dioxazine‐based color pigment was added to a commercial polyamide 6 (PA6) through an extrusion process, in order to prepare monoconcentrated violet masterbatches through different production set‐up. A detailed characterization of the resulting materials was carried out in order to find the best processing parameters combination to optimize pigment dispersion and to reduce the clogging power. The preparation of masterbatches with repeated extrusions markedly reduced the filter pressure value and increased the Relative Color Strength, while filtration did not significantly influence pigment dispersion. Rheological measurements and end‐groups analysis were conducted on the same materials with the aim to evaluate their thermal degradation resistance, and the thermal stability of the compounds was retained even upon three extrusions. Therefore, it can be concluded that a proper optimization of the process parameters could lead to an important reduction of the production waste, increasing the quality of the final product. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41452.

The effect of masterbatch pigments on the crystallisation, morphology, and shrinkage behaviour of Isotactic Polypropylene

“…Commercially available masterbatch pigments are typically a premix of organic and inorganic pigments in a suitable polymer carrier such as LDPE (low density polyethylene). When compared to neat colour powders or liquids, masterbatch pigments offer benefits in product quality and ease of use such as: higher colour strength, reduced cleaning time, and better dispersion behaviour [3]. In addition, specialist feeding, and mixing equipment would be required if pigments were to be added to the polymer granules in liquid or powder form and the use of fine powders raises health and safety concerns.…”

Linear-type carbazoledioxazine-based organic semiconductors: the effect of backbone planarity on the molecular orientation and charge transport properties

“…38 Among these dye/pigment molecules, the angular-type carbazoledioxazine (CZ, X ¼ Cl, Chart 1 middle), also called pigment violet 23, is a well-known commercial pigment, but it has been less explored in the eld of organic electronics. [39][40][41][42] Note that this pigment is not only a member of the electronaccepting dioxazine family, but also originates from the electron-donating carbazole. 43,44 Thus, the violet color is derived from the highly-efficient intramolecular charge-transfer (CT) band.…”

Halogen Substitution Effects on the Molecular Packing and Thin Film Transistor Performances of Carbazoledioxazine Derivatives

“…Carbazoledioxazine, also called violet 23, is a well-known violet pigment, which has been employed as a coloring material for plastics and printing inks. − This pigment can usually be synthesized by the condensation of 3-amino-9-ethylcarbazole with p -chloranil followed by 2-fold cyclization reactions. Substitution of long alkyl chains at the nitrogen atoms of the carbazole unit allowed for the detailed synthetic studies of isomer structures in terms of spectroscopic characterization and X-ray crystal structure analysis .…”