Location History:
- Sindelfingen-Darmsheim, DE (2011)
- Reppenstedt, DE (2011 - 2013)
Company Filing History:
2 out of 5 
1 out of 2 Years Active: 2011-2013
Title: The Innovative Mind of Holger Keller
Introduction
Holger Keller, a distinguished inventor based in Reppenstedt, Germany, has made significant contributions to the field of flame retardant materials. With three patents to his name, Keller's work focuses on developing innovative chemical solutions that enhance safety and performance in various applications.
Latest Patents
Keller's latest patents underscore his expertise in flame retardant technology. One of his notable inventions is a halogen-free flame retardant, derived from the polycondensation of phosphoric monomers with esterifying monomers. This advanced compound, characterized by an average molecular weight exceeding 20,000 and a degree of polymerization of at least 55, is ideally suited for the production of polyamide and polyester fibers through melt spinning.
Another significant invention includes nitrous bridged derivatives of 6H-dibenz[c,e][1,2]-oxaphosphorine-6-oxides. This patent relates to a novel process for preparing these derivatives, which serve as effective flameproofing agents for various polymers, including polyesters, polyamides, and epoxies. These advancements highlight Keller's commitment to improving material safety and performance.
Career Highlights
Keller has built a robust career by working with reputable companies in the materials science sector. Notably, he has contributed to Schill + Seilacher “struktol” Aktiengesellschaft and Schill + Seilacher Aktiengesellschaft. His role in these organizations has been instrumental in advancing flame retardant technology and other innovative chemical solutions.
Collaborations
Throughout his career, Keller has collaborated with skilled professionals such as Uwe Storzer and Berthold Just. These partnerships have enriched his research and development efforts, leading to groundbreaking inventions that continue to benefit various industries.
Conclusion
Holger Keller exemplifies the spirit of innovation in the materials science domain. His patented technologies for flame retardants showcase his expertise and dedication to creating safer products. With a successful career and notable collaborations, Keller remains an influential figure in the advancement of polymer safety and performance solutions.