Functionalization of Soluble Guayule Resins using Functional Dithiophosphoric Acids

Case ID:

Functionalized polymers of a reaction product of a polymer including one or more olefins and a dithiophosphoric acid compound can provide a wide range of olefinic polymers in bulk-neat conditions or in solution via eletrophilic addition processes. Such new compositions provide a wide range of new functional polymers via an inexpensive polymer production process and as a route to low cost, specialty optical and flame retardant polymers. Suitable olefins include polybutadienes, polyisoprenes, natural soluble or gum rubber, guayule resins, polydienes, and cyclic olefins.  

Dithiophosphoric acids (DTPAs) can be readily made by the reaction of phosphorus pentasulfide (P2S5), or the dimeric form (P4S10) with alcohols (ROH) to form a mono-functional dithiophosphoric acid. While dithiophosphoric acids have long been known in organic synthesis, the application and utility of these molecules for polymer functionalization have not been developed.


  • Production of natural rubber, soluble polydienes, synthetic SBR
  • Polynorbornene derivatives and other polymers derived from ring-opening metathesis
  • Any polymer containing an unsaturation
  • Optical polymers with high refractive index
  • Flame retardant polymers


  • Low cost raw materials
  • Neat/bulk or solution processing
  • New composition space for tuneability
Patent Information:
Contact For More Information:
Jonathan Larson
Senior Licensing Manager, College of Science
The University of Arizona
Lead Inventor(s):
Dong-Chul Pyun
Jon Njardarson