MUMBAI, India, June 24 -- Intellectual Property India has published a patent application (202617064043 A) filed by Dic Corporation on May 21, 2026, for Method For Producing Polyurethane Polyisocyanate.
Inventors include Teshima Tsuneyuki; and Hirota Yasunobu.
The application for the patent was published on June 12, 2026, under issue no. 24/2026.
Abstract: To provide a method for producing polyurethane polyisocyanate having stable quality without needing to dispose of unreacted isocyanate monomer discharged from the production process. The method for producing polyurethane polyisocyanate includes: a step 1 for reacting TDI (o) having a proportion of 2,4-TDI of 50 mass% to 90 mass% with a polyol (p) to obtain a composition containing polyurethane polyisocyanate (A1) and TDI (o '); a step 2 for removing the TDI (o ') from the composition obtained in step 1; a step 3 for adding 2,4-TDI to at least a part of the TDI (o ') to obtain a composition containing polyurethane polyisocyanate (A2) and TDI (q ') by reacting TDI (q) adjusted to a 2,4-TDI content of 50 mass% to 90 mass% with polyol (r); and a step 4 for removing the TDI (q ') from the composition obtained in step 3.
Disclaimer: Curated by HT Syndication.
