Process and system for colouring plastics moulding compositions

Patent metadata

Field	Value
Publication number	US-9427889-B2
Application number	US-201013382252-A
Country	US
Kind code	B2
Filing date	Aug 20, 2010
Priority date	Sep 29, 2009
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The present invention relates to a process for producing colored plastics molding compositions with aqueous liquid colors, where an aqueous liquid color is added to a molten plastics molding composition.
The present invention also describes a system for conducting the said process.

First claim

The invention claimed is:

1. A process or producing a color plastic molding composition, the process comprising:
adding an aqueous solution comprising a colorant and water to a molten plastic molding composition in an extruder, wherein the extruder comprises one or more vent zones, and the aqueous solution is added after all of the one or more vent zones.

2. The process of claim 1 , wherein the molten plastic molding composition comprises a poly(meth)acrylate.

3. The process of claim 1 , a content of the colorant in the aqueous solution is from 0.5% to 50% by weight based on a total weight of the aqueous solution.

4. The process of claim 1 , wherein the aqueous solution further comprises a dispersing agent at a content from 5% to 50% by weight based on a total weight of the aqueous solution.

5. The process of claim 4 , wherein the dispersing agent is a polyacrylate comprising a hydrophilic or an ionic group.

6. The process of claim 4 , wherein a ratio by weight % of water to the dispersing agent is in a range from 2:1 to 1:2.

7. The process of claim 1 , wherein the adding is performed under pressure.

8. The process of claim 7 , wherein a pressure of the aqueous solution is in a range from 0.1 to 200 bar.

9. The process of claim 7 , wherein a difference between a first pressure at an aqueous solution feed site in the extruder and a second pressure of the aqueous solution is in a range from 0.1 to 100 bar.

10. The process of claim 9 , wherein a temperature of the molten plastic molding composition at the aqueous solution feed site is in a range from 180 to 330° C.

11. The process of claim 10 , wherein the temperature and the pressure at the aqueous solution feed site are such that an equilibrium state of water is gaseous.

12. The process of claim 1 , wherein a ratio by weight of the aqueous solution to the molten plastic molding composition is in a range from 1:10 to 0.0001:10.

13. The process of claim 1 , further comprising, prior to the adding:
continuously polymerizing a reaction mixture comprising monomers in an extruder, to obtain the molten plastic molding composition.

14. The process of claim 1 , which is performed as a continuous process.

15. The process of claim 1 , wherein the extruder comprises one vent zone and the aqueous solution is added after the one vent zone.

16. The process of claim 1 , wherein the extruder comprises a plurality of vent zones and the aqueous solution is added after the last of the plurality of vent zones.

Assignees

• Kluge Andreas
• Becht Simon
• Goldacker Thorsten
• Wick Thomas
• Jucys Michael
• Golchert Ursula
• Schultes Klaus
• Evonik Roehm Gmbh

Inventors

• Kluge Andreas
• Becht Simon
• Goldacker Thorsten
• Wick Thomas
• Jucys Michael
• Golchert Ursula
• Schultes Klaus

Classifications

• B29C48/40

  using two or more parallel screws {or at least two parallel non-intermeshing screws}, e.g. twin screw extruders · CPC title

• B29C2948/926

  Flow or feed rate · CPC title

• B29C2948/92961

  Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units · CPC title

• B29C2948/924

  Barrel or housing · CPC title

• B29B7/38 Primary

  rotary (B29B7/52 takes precedence) · CPC title