Sandra L Witman

Title: **Innovative Contributions of Sandra L. Witman**

Introduction

Sandra L. Witman, an accomplished inventor based in Wilmington, DE, has made significant contributions to the field of pigment technology. With a total of two patents to her name, her innovative work focuses on processes that enhance the properties and utility of pigments in various applications.

Latest Patents

Sandra's latest patents showcase her expertise in creating self-dispersing pigments. The first patent, titled "Self-dispersing pigment and process of making and use of same," introduces a process for oxidizing pigments with ozone in an aqueous environment. This method ensures that the pigment remains self-dispersing, ideally maintaining an acid value of less than 3 µmoles/M. Furthermore, her approach enables the production of ink jet inks that contain these advanced pigments, expanding their applicability in the ink industry.

Her second patent, "Method of producing stabilized organic pigment particles and device therefor," outlines a method for modifying organic pigment particles to produce self-dispersible, stabilized versions. This process involves exposing the pigment surfaces to ozone or a plasma-activated process gas, which prevents dangerous exothermic reactions when the particles interact with air. The innovative device she developed to facilitate this method includes a reactor and an agitator assembly, enhancing the efficiency of pigment surface modification essential for various coating compositions.

Career Highlights

Sandra L. Witman is currently affiliated with E.I. DuPont de Nemours and Company, a leader in chemical and materials innovation. Her role at the company underscores her capabilities in research and development, significantly impacting the field of pigment technology through her patents.

Collaborations

Throughout her career, Sandra has worked alongside notable colleagues such as An-Gong Yeh and James Lewis Hohman, Jr. These collaborations reflect the interdisciplinary nature of her work, combining expertise in chemistry and engineering to push the boundaries of pigment applications.

Conclusion

Sandra L. Witman's contributions to pigment technology through her innovative patents demonstrate her significant impact on the industry. Her dedication to advancing the processes involved in pigment production not only enhances the efficiency of existing applications but also paves the way for new possibilities in inks and coatings.