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Method for the production and use of pigmented thermoplastic material comprising a flow enhancer in the form of a dissolved salt

  • US 7,892,461 B2
  • Filed: 11/03/2006
  • Issued: 02/22/2011
  • Est. Priority Date: 11/04/2005
  • Status: Active Grant
First Claim
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1. A method for the production of a pigmented thermoplastic material, characterized in that in a first step an aqueous suspension, presenting a solid matter contents of approximately 10 to 75% by weight, which contains a flow enhancer in form of a dissolved salt and the pigment is ground under alkaline conditions in a high-energy feed mill with grinding bodies having a diameter of 0.2 to 2 mm, and the obtained ground product is converted with a thermoplastic material into the pigmented thermoplastic material during a second step, making use of a flush process performed in a kneading device or extruder, at increased temperature and a pH value of initially 7 or less.

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