David J Sparrow

Title: David J. Sparrow and His Polymer Inventions.

Introduction

David J. Sparrow is an inventor associated with Tervuren, Belgium, and Imperial Chemical Industries Limited. His work includes inventions concerning polymeric polyamines and processes for preparing polyurea and polyurea/polyurethane polymers. Sparrow is credited with 4 patents.

Latest Patents

“Process for Preparing Polyurea and Polyurea/Polyurethane Polymers” describes a process for producing these compounds by reacting an organic polyisocyanate with a diamine chain extender and an isocyanate-reactive polymer. The process uses a polymeric polyamine with a molecular weight of 1,000 to 16,000 and two to four primary amino groups per molecule. The described polyamine is made by condensing a polycarboxylic acid or ester with an excess of a polyamine having terminal propoxy groups.

“Polymeric Polyamines” concerns polymeric polyamines with a molecular weight of 1,000 to 16,000 and two to four primary amino groups per molecule. The invention describes producing them through condensation of a polycarboxylic acid or ester with an excess of a polyamine having terminal aminopropoxy groups and a molecular weight below 500.

Career Highlights

Sparrow’s listed patent work focuses on polymer chemistry, particularly materials and processes involving polyurea, polyurethane, and polymeric polyamines. His inventions describe both the preparation of polymeric intermediates and their use in producing polymer compounds.

Collaborations

Sparrow is associated with Imperial Chemical Industries Limited. His listed coworkers include James P. Brown and James M. Bentley.

Conclusion

David J. Sparrow’s patent record highlights contributions to polymer chemistry through inventions addressing polymeric polyamines and processes for preparing polyurea and polyurea/polyurethane materials.