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Loulou Rozek - Develop Your Colors to the Fullest. Novel Dispersants for Optimum Pigment Dispersions in Waterborne Performance Coatings

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Loulou Rozek - Develop Your Colors to the Fullest. Novel Dispersants for Optimum Pigment Dispersions in Waterborne Performance Coatings

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Loulou Rozek
Technical Service Manager, Americas
Borchers
OMG Americas Inc.

Phone: 440-808-7223
Fax: 440-808-7284

Website: www.borchers.com

An increase in market demand for vibrant colors in waterborne automotive and performance coatings to match those of solvent-borne systems has been observed in the recent years. To meet such demands, unique high molecular weight polyurethane dispersants were engineered to provide the ultimate color development with both organic and high-jetness carbon black pigments in waterborne performance coatings.

The electron-rich core of these novel dispersants with a variety of functional side chains, engineered to be compatible with a wide range of binder systems has demonstrated a clear advantage in pigment surface wetting when compared to a variety of benchmark dispersants. Our unique polymer engineering allows for enhanced adsorption to the sparsely functional, yet electron-rich surface of difficult to disperse organic pigments such as PR 179 (perylene), PB 15:1 (phthalo cyanine blue) and PBk 7 (high jetness carbon black) pigments. The enhanced pigment-dispersant interactions of these dispersants are clearly evident during the early stages of the grinding process, as evidenced by lower pigment particle size, stronger color development and lower viscosity within the first thirty minutes of grinding. An in-depth study on the relations between pigment grind-time, mean particle size, color development (or jetness), viscosity and viscosity stability will be discussed.   

This presentation will explain the pigment-dispersant interactions and how balancing and optimizing those interactions will lead to excellent color development, with the desired hues and resultant optimum film properties.

An increase in market demand for vibrant colors in waterborne automotive and performance coatings to match those of solvent-borne systems has been observed in the recent years. To meet such demands, unique high molecular weight polyurethane dispersants were engineered to provide the ultimate color development with both organic and high-jetness carbon black pigments in waterborne performance coatings.

The electron-rich core of these novel dispersants with a variety of functional side chains, engineered to be compatible with a wide range of binder systems has demonstrated a clear advantage in pigment surface wetting when compared to a variety of benchmark dispersants. Our unique polymer engineering allows for enhanced adsorption to the sparsely functional, yet electron-rich surface of difficult to disperse organic pigments such as PR 179 (perylene), PB 15:1 (phthalo cyanine blue) and PBk 7 (high jetness carbon black) pigments. The enhanced pigment-dispersant interactions of these dispersants are clearly evident during the early stages of the grinding process, as evidenced by lower pigment particle size, stronger color development and lower viscosity within the first thirty minutes of grinding. An in-depth study on the relations between pigment grind-time, mean particle size, color development (or jetness), viscosity and viscosity stability will be discussed.   

This presentation will explain the pigment-dispersant interactions and how balancing and optimizing those interactions will lead to excellent color development, with the desired hues and resultant optimum film properties.

BIO

Loulou Rozek came to Borchers USA in 2015, as the Technical Service Manager Americas, with extensive experience in Additives and specialty minerals for coatings, with emphasis on pigment concentrate formulating. Prior to Borchers, Loulou worked with Engelhard Specialty Minerals and EFKA Additives as the Regional Technical Advisor and Industry Manager for Coatings in Europe. Loulou has a Masters degree in organic chemistry from the University of Amsterdam.

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