Process for the continuous production of liquid, pigmented coating compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsEvert Kramer, Friedrich Domke
Life of this patent
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Abstract
The invention relates to a process for the continuous production of liquid coating compositions by introducing one or more low-solvent or solvent-free binders in a solid or molten state into an extruder in one stage, together with pigments and auxiliaries, wherein the components are mixed and dispersed at elevated temperature in a viscous state, then introducing proportions of binders and proportions or organic or inorganic solvents into the extruder in one or more following stages, discharging the mixture from the extruder and adding further solvents and optionally further components of the coating composition and homogenizing the process mixture in one or more rotor/stator mixers.
Claims16
Process for the continuous production of liquid coating compositions comprising
- a. introducing in a first stage one or more low-solvent or solvent-free binders into an extruder together with pigments and additives, and subsequently mixing and dispersing the components in a viscous state at an elevated temperature below 200° C.,
- b. introducing proportions of organic solvents and/or water and additional constituents of the coating composition in one or more following stages into the extruder, wherein the viscosity of the process mixture is reduced and the temperature of the process mixture is lowered below 70° C.,
- c. discharging the process mixture from the extruder and adding further organic or inorganic solvents and optionally adding additional components of the coating composition and
- d. homogenizing the process mixture in one or more high shear mixers to form the liquid coating composition.
Dependencies are inferred from the claim text.