Richard Allen Fisher

Title: Richard Allen Fisher: Innovator in Polymerization Technology

Introduction

Richard Allen Fisher, an accomplished inventor based in League City, TX, has made significant contributions to the field of polymer chemistry. With a portfolio of five patents, his innovative work primarily focuses on catalyst systems that enhance the polymerization processes of various monomers.

Latest Patents

One of Fisher's noteworthy inventions is the development of bimetallocyclic transition metal catalyst systems. This patent pertains to single-site catalyst systems composed of activated bimetallocyclic transition metal compounds. These catalysts are designed for the polymerization of ethylenically and acetylenically unsaturated monomers. The unique structure of these bimetallocyclic compounds includes two metal atoms from Group 4 or Group 5, linked by covalent bridging, allowing for delocalized bonding within the cyclic structure. Notably, a specific compound he highlighted, bis-M-(trimethylsilyl-methylidyne) tetrakis-(trimethylsilylmethyl) ditantalum, has proven effective in producing ethylene polymers with a high molecular weight and narrow molecular weight distribution.

Additionally, Fisher has patented a high-temperature olefin polymerization process. This method involves using an ionic catalyst system in the presence of a long-chain, linear alkyl ligand-containing organo aluminum compound to process olefinically or acetylenically unsaturated monomers. Fisher's preferred ionic catalysts derive from unique bridged hafnium and titanium compounds, enabling the creation of high molecular weight polyolefins, particularly ethylene copolymers, under elevated temperatures.

Career Highlights

Richard Allen Fisher's career has been prominently marked by his affiliation with Exxon Chemical Patents, Inc. His groundbreaking work in catalyst systems has solidified his reputation as a significant figure in the field of polymer chemistry and innovation.

Collaborations

Throughout his professional journey, Fisher has collaborated with several esteemed colleagues, including Donna Jean Crowther and Howard William Turner. These partnerships have enriched his work and facilitated advancements in the polymerization technologies he has helped develop.

Conclusion

Richard Allen Fisher's contributions to polymerization processes through advanced catalyst systems underscore his role as a pioneering inventor. With his innovative spirit and dedication to chemistry, Fisher continues to impact the industry, paving the way for future advancements in polymer technology.