Company Filing History:
Years Active: 1977-1981
Title: Gunther Zwahlen: Innovator in Pigment Preparation and Imaging Processes
Introduction
Gunther Zwahlen is a notable inventor based in Dornach, Switzerland. He has made significant contributions to the field of pigment preparation and imaging processes. With a total of 4 patents to his name, Zwahlen's work has had a considerable impact on various applications in the industry.
Latest Patents
One of his latest patents is a method for the production of a pigment preparation for coloring linear polyesters in the melt. This invention involves forming a concentrate from 20 to 80 parts of pigment and 80 to 20 parts of a polyester that melts between 60°C and 160°C. The process includes kneading in the presence of a salt and a solvent or by a flush process, followed by mixing the concentrate with a fiber-forming linear polyester, melting the mixture, and processing it into granules. The invention also provides the pigment preparation obtained by this process and the linear polyesters colored with it.
Another significant patent by Zwahlen is an electrophotographic imaging process using anthraquinoid black pigments. This process involves electrically photosensitive particles for image reproduction that consist of a black pigment selected from anthraquinoid pigments containing at least two anthraquinone radicals or at least six condensed rings, as well as perylenetetracarboxylic diimides or metal complexes.
Career Highlights
Gunther Zwahlen has been associated with Ciba-Geigy Corporation, where he has contributed to various innovative projects. His expertise in pigment preparation and imaging processes has positioned him as a key figure in his field.
Collaborations
Zwahlen has collaborated with notable coworkers such as Andreas Laely and Fridolin Babler, further enhancing the innovative work being done in his area of expertise.
Conclusion
Gunther Zwahlen's contributions to pigment preparation and imaging processes demonstrate his innovative spirit and dedication to advancing technology. His patents reflect a commitment to improving industrial applications, making him a significant figure in the field of inventions.