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Formulation Studies Using EVOQUE™ Pre-Composite Polymer Technology

IP.com Disclosure Number: IPCOM000239038D
Publication Date: 2014-Oct-02

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The IP.com Prior Art Database

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Yogesh Tiwary: AUTHOR [+2]

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DOW COATING MATERIALS

1. Description EVOQUE™ Pre-Composite Polymers are based on a new and unique technology that offers improvements in Titanium Dioxide (TiO2) hiding. During the paint making process, the EVOQUE Pre-Composite Polymer with adsorbing functionality combines with TiO2 to form a polymer-pigment composite, resulting in optimal TiO2 particle separation for light scattering, which helps improve both wet and dry hiding efficiency of the pigment. In addition, barrier performance properties of the film are maintained or improved. This report contains a small subset from numerous formulation studies using adsorbing polymers based on EVOQUE Pre-Composite Polymer Technology.

EVOQUE Pre-Composite Polymers are commercially available in three chemistries: All- Acrylic, Styrene-Acrylic, and Vinyl-Acrylic. The generic terms Pre-Composite polymer, Pre- Composite, and adsorbing polymer are used interchangeably within this report to refer to polymers based on the EVOQUE Technology.

Commercial and non-commercial Pre-Composite polymers could have combinations of polymers of different Tg as described in Patent US7265166 and US20020096088, designed for additional process robustness and performance benefits.

Pre-Composite polymers may also have low levels of water soluble salts as described in Patent US6710161, designed for additional processing robustness and performance benefits.

Pre-Composite polymers may have morphology as described in Patent US7179531 and WO2013116318A1, designed for additional processing robustness and performance benefits, referred to as "advanced morphology" in this report.

Pre-Composite polymers may have a bimodal particle size distribution as described in Patent US6818697, designed for additional processing robustness and performance benefits.

Pre-Composite polymers may have additives as described in Patent US7803858 or US8318848, designed for additional processing robustness and performance benefits.

In general, the trends reported in this paper should apply to paints based on most adsorbing polymers, and in some cases, even when using different adsorbing functionality. It should be noted that the response of adsorbing polymers in paint is dependent on the paint recipe, and sometimes small changes could result in big differences in paint performance and behavior. Results presented in this report were obtained under controlled conditions to get responses that are both desired and un-desired (for troubleshooting), and variables of interest were modified to study the impact. Some un-desired responses (for

example, grit and viscosity instability) could be resolved by other, sometimes more effective

ways as disclosed elsewhere. Some paint recipes used in included studies have TiO2 as the only pigment to reduce the number of formulation variables, but the addition of other pigments like opaque polymer and extenders should not significantly change the observed trends. Recipes and test methods used are included in t...