Particle size analysis by laser diffraction in organic pigment technology

Organic pigments are used to colour organic coatings and indeed they are major constituents of printing and packaging inks. They are commonly supplied in powder form, the grain size distribution of which can be determined directly by laser diffraction using dry powder feed. This is advantageous in m...

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Bibliographic Details
Published in:Progress in organic coatings 1997-01, Vol.31 (3), p.223-228
Main Authors: McGarvey, M, McGregor, D, McKay, R.B
Format: Article
Language:English
Subjects:
Applied sciences
Coatings. Paints, varnishes and inks
Components, formulation
Exact sciences and technology
Laser diffraction
Low angle laser light scattering (LALLS)
Particle
Pigment
Polymer industry, paints, wood
Powder
Size
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Summary:Organic pigments are used to colour organic coatings and indeed they are major constituents of printing and packaging inks. They are commonly supplied in powder form, the grain size distribution of which can be determined directly by laser diffraction using dry powder feed. This is advantageous in monitoring dry milling procedures used to reduce lump dry presscake to fine powder, and for comparison and matching of different types of milling equipment. Grain size distribution can affect dispersibility of a pigment in application media, especially premix dispersion in ink media. Also laser diffraction in a `wet' cell can be used to monitor dispersion of organic pigments in liquid media of low viscosity, such as nitrocellulose/alcohol-based ink millbases. Such uses are exemplified here and the principles and techniques of particle size analysis by laser diffraction are discussed in the context of organic pigments.
ISSN:0300-9440
1873-331X
DOI:10.1016/S0300-9440(97)00041-6