Donald F Stewart

Title: The Innovations of Donald F. Stewart

Introduction

Donald F. Stewart is a notable inventor based in Whippany, NJ (US). He has made significant contributions to the field of materials science, particularly in the development of advanced nylon compositions. With a total of 5 patents, his work has had a considerable impact on molding and film applications.

Latest Patents

Stewart's latest patents focus on glass fiber reinforced nylon compositions comprising poly(amide-ether). These nylon compositions are designed for molding and film applications, showcasing enhanced film properties and impact strength. The compositions consist of a polyamide resin and a block copolymer of poly(amide-ether), which includes specific structural formulas that define the alkyl groups and integers involved. In one embodiment, a nonpolymeric amide is incorporated into the composition, resulting in articles with improved impact strength. The films produced from these compositions demonstrate better drapeability compared to unmodified resins, both at room temperature and after heat-aging. Additionally, the inclusion of mineral and other reinforcing fillers, such as glass fibers, during the extrusion process leads to reinforced compositions with superior impact characteristics.

Career Highlights

Throughout his career, Donald F. Stewart has worked with prominent companies, including AlliedSignal Inc. and Allied Corporation. His experience in these organizations has contributed to his expertise in developing innovative materials.

Collaborations

Stewart has collaborated with notable colleagues, including Michael F. Tubridy and Varkki P. Chacko. These partnerships have likely enriched his research and development efforts.

Conclusion

Donald F. Stewart's contributions to the field of nylon compositions and materials science highlight his innovative spirit and dedication to advancing technology. His patents reflect a commitment to improving the performance of materials used in various applications.