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Home  > Raw materials & technologies  > Technologies  > Powder coatings  > Dispersion-coated powder colouring system...

Sunday, 15 September 2019
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Raw materials & technologies, Technologies, Powder coatings

Dispersion-coated powder colouring system patented

Wednesday, 25 January 2012

A coloured powder composition baying a core particle and a partial shell about this particle is the basis for a method for colouring powders using a stable colorant dispersion

The target of the patent is to form a base powder with a particle size of 10 to 300 microns Source: Fotolia/Allyson Ricketts

The target of the patent is to form a base powder with a particle size of 10 to 300 microns Source: Fotolia/Allyson Ricketts

Valspar Sourcing Inc. has been granted a patent for a method comprised of extruding a powder mixture to form a base powder with a particle size of 10 to 300 microns. The base powder mixture comprises a carboxyl-functional polyester resin curable with an epoxide-functional compound. While mixing the base powder with at least one stable colourant dispersion below approximately 40° C there is a minimal change in the particle size of the base powder particles. That means that the stable colourant dispersion consists of a pigment and a dye in a liquid carrier. This liquid carrier is selected from water, organic solvents and combinations thereof. It does not cause melting or softening of the base powder. Furthermore the pigment is selected from organic pigments with a median particle size of less than 0.3 microns, titanium dioxide pigments with a median particle size of 0.3 to 0.5 microns, iron oxide pigments with a median particle size of 0.2 to 0.6 microns, carbon black pigments with a median particle size of approximately 0.07 microns, and phthalocyanine blue pigments with a median particle size of approximately 0.05 microns. The coloured mixture is treated at temperatures below the softening point of the base powder to form a free flowing powder.
The patent number is U.S. 7,867,555 B2

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