Pigment modification improving handling characteristics
The poor solid flow characteristics of high aspect ratio materials (i.e., having a long length compared to width, e.g., platelet-shaped) such as mica are well known. In many industries, such as paint and ink manufacture, this does not cause any significant problems. However, in the case of extruder...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
17.09.2002
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| Online Access | Get full text |
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| Summary: | The poor solid flow characteristics of high aspect ratio materials (i.e., having a long length compared to width, e.g., platelet-shaped) such as mica are well known. In many industries, such as paint and ink manufacture, this does not cause any significant problems. However, in the case of extruder based plastics processing it leads comparatively low output rates for any given size of machine. This is perhaps somewhat surprising since high aspect ratio pigments such as pearlescent pigments have a relatively high density and therefore might be expected to give good results as is the case for fillers of similar density such as calcium carbonate.
The present invention is directed to a process for producing a master batch of pigment, comprising mixing a pigment having a high aspect ratio, embedded in a material increasing bulk density of the pigment, with a plastic so as to produce a dispersion of pigment and plastic. |
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