Roelof R Hendriksma

Title: Roelof R Hendriksma: Innovator in Toner Powder Technology

Introduction

Roelof R Hendriksma is a notable inventor based in Panningen, Netherlands. He has made significant contributions to the field of toner powder technology, holding 2 patents that showcase his innovative approaches.

Latest Patents

Hendriksma's latest patents include a dispersion-heat process employing hydrophobic silica for producing toner powders. These toner powders exhibit excellent flow and non-agglomerating properties, making them readily removable from the imaging medium used in indirect electrophotographic copying. The toner is provided in the form of substantially spherical resin particles, which can contain additives as desired. These particles are formed from irregularly shaped resin particles that are heated in a liquid dispersion containing hydrophobic silica particles smaller than 100 nanometers in diameter. The toner particles can also carry electrically conductive particles, such as carbon black, on their surface, rendering them attractable by electrical inductance. The preparation process involves heating and stirring irregularly shaped resin particles and hydrophobic silica particles in a liquid carrier, such as water or a mixture of water and a water-miscible organic solvent, until the resin particles soften and become spherical.

Another patent focuses on a process for reversal development of an electrical potential pattern formed by imagewise exposure of a uniformly charged photoconductive layer. In this process, the charging of the layer is restricted to a level below its breakdown voltage, ensuring that the contact between the photoconductive layer and the toner powder is insulating. A magnetisable and inductively attractable toner powder is applied using a magnetic brush device with a conductive development roller suited for reversal development.

Career Highlights

Throughout his career, Hendriksma has worked with prominent companies such as Oce-van Der Grinten N.V. and Oce-Nederland B.V. His work has significantly impacted the development of advanced toner technologies.

Collaborations

Hendriksma has collaborated with various professionals in his field, including Wilhelmus J VanRhijn, enhancing the innovation process through shared expertise.

Conclusion

Roelof R Hendriksma's contributions to toner powder technology reflect his innovative spirit and dedication to advancing the field. His patents demonstrate a commitment to improving the efficiency and effectiveness of toner applications in electrophotographic processes.