| 摘要 |
The invention relates masterbatches comprising pellets or micro pellets of one or more Single Pigment Concentrates (SPCs) and of one or more Additive Concentrates with at least two different chemical compositions, or of two or more Single Pigment Concentrates (SPCs) with at least two different chemical compositions, or of two or more Additive Concentrates with at least two different chemical compositions, characterised in that the pellets or micro pellets with different chemical compositions are of substantially equal density, size, shape and/or electrostatic properties. The invention further relates to a process for preparing said pellets or micro pellets in that a Single Pigment Concentrate (SPC) or Additive Concentrate with a chemical composition of specific weight is taken as reference and that the specific weight of all other SPCs or Additive Concentrates is adjusted to the specific weight of the reference by adapting the concentration of pigment (in the SPC) or additive (in the Additive concentrate) or by adding a filler or a blowing agent to the SPCs or Additive Concentrates.
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