Patent ID: 6420466
Filing Date: 2002-07-16
Classification: C08G,Y10S

Abstract:
A process for preparing a urea urethane thixotropic agent comprising reacting a urethane-isocyanate having the formula: with a diamine having the formula:H2Nâ€”Râ€³â€”NH2, or where R is n-C4-22alkyl, isoC4-22alkyl, C6-12cycloalkyl, C7-12aralkyl, CmH2m+1(Oâ€”CnH2n)xâ€” or CmH2m+1(OC(&boxH;O)â€”CvH2v)xâ€”; Râ€³ is â€”CYH2y; and Râ€²â€³ is CH3â€” or H, wherein y is from 2 to 12; m is from 1 to 22; n is from 2 to 4; x is from 1 to 15; and v is 4 or 5, in the presence of a lithium salt; provided that the urethane-isocyanate has had unreacted diisocyanate removed prior to reaction with the diamine.