Location History:
- Minneapolis, MN (US) (1997 - 1999)
- Maplewood, MN (US) (1997 - 2000)
Company Filing History:
Years Active: 1997-2000
Title: Innovations of Youlu Duan in Polymer Chemistry
Introduction
Youlu Duan is a notable inventor based in Maplewood, MN (US), recognized for his contributions to polymer chemistry. He holds a total of 10 patents, showcasing his innovative approach to developing advanced materials.
Latest Patents
Among his latest patents, Duan has developed water-based sulfonated polymer compositions. This invention involves a method for preparing sulfonated polymer compositions by reacting water dispersible isocyanate-terminated polyurethane prepolymers in the presence of aqueous polyvinyl dispersions containing active hydrogen atoms. The invention also includes a water-based sulfonated polyurethane polyvinyl hybrid latex, which utilizes a sulfonated polyurethane as a seed for polymerization of ethylenically unsaturated monomers. These compositions are characterized by enhanced mechanical and adhesion properties, forming interpenetrating polymer networks or core-shell type structures.
Another significant patent by Duan is for stable aqueous polyurethane dispersions. This invention discloses a stable aqueous polyurethane dispersion comprising a reaction product of a water dispersible isocyanate-terminated polyurethane prepolymer, an aqueous polyurethane dispersion, and water. The method involves dispersing the prepolymer in the aqueous dispersion and reacting it at temperatures between 35°C to 95°C until it is substantially free of isocyanate. These dispersions are particularly useful in adhesives, coatings, binders, primers, and sizers.
Career Highlights
Duan's career is marked by his role at H.B. Fuller Licensing & Financing Inc., where he has made significant strides in the field of polymer technology. His innovative work has contributed to the development of new materials that have practical applications across various industries.
Collaborations
Throughout his career, Duan has collaborated with notable colleagues, including Sonja E. Stammler and Yi Wei. These collaborations have further enhanced his research and development efforts in polymer chemistry.
Conclusion
Youlu Duan's contributions to polymer chemistry through his innovative patents demonstrate his expertise and commitment to advancing material science. His work continues to impact various applications, showcasing the importance of innovation in this field.