C CHEMISTRY; METALLURGY
C08 ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
C08G MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
18/00 Polymeric products of isocyanates or isothiocyanates
C08G18/06 with compounds having active hydrogen
C08G18/0838 Manufacture of polymers in the presence of non-reactive compounds