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David Fasano - Rheological Considerations When Formulating High Hiding Paints Utilizing Pre-Composite Polymers

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David Fasano - Rheological Considerations When Formulating High Hiding Paints Utilizing Pre-Composite Polymers

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David Fasano
Application Scientist
The Dow Chemical Company
215-429-4321
www.dow.com
Co-authors: Linda Adamson, Stan Brownell, Tara Conley, Jocelyn Gruver


ABSTRACT

Pre-composite polymer was introduced into the coatings industry as a means to increase the light scattering efficiency of TiO2.  These latex binders, designed to adsorb onto the surface of TiO2, allow for a more uniform distribution of the pigment resulting in an increase in its intrinsic hiding efficiency.  Formulators can take advantage of this intrinsic hiding efficiency and use these polymers in a wide array of paints, including paints with the market claim of ‘one coat hide’.  These types of high performance paints tend to employ high TiO2 levels and high volume solids, making rheological adjustments more challenging than traditional lower volume solids formulations.  The introduction of pre-composite polymers have taken a challenging formulating task and added complexity.  This paper describes a working mechanism for the fundamental contribution to rheology and offers a hypothesis as to why the unique shape of a polymer-pigment composite drives increased viscosity.  The Krieger-Dougherty equation will be used to estimate the composite rheology contribution.  This mechanistic understanding can be used by formulators to guide their current efforts in developing high quality, high intrinsic hiding paints. Dow’s future work will focus on the interactions of polymer-pigment composite and additives, thus enhancing the latitude of pre-composite polymer in the growing segment of high quality, high hiding paints.

BIO

As Application Scientist for The Dow Chemical Company, Dr. David Fasano is responsible for technical support of the company’s Architectural Coatings business.  Dr. Fasano’s areas of interest include opacity, light scattering, pigmentation, rheology, dispersion and film formation across the paint, coatings, building, construction, paper and personal care industries. Dr. Fasano began his Dow career at the Rohm and Haas Company in 1982 after earning a Ph.D. in Physical Chemistry from the University of Nebraska.

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