Patent ID: 6617468
Filing Date: 2003-09-09
Classification: C08G,C09D

Abstract:
A process for preparing a compound having formula (II) comprising reacting a mixture of monoisocyanate compounds having formulas (II) and (III): with a diamine having the formula H2Nâ€”R3â€”NH2 or wherein R1 and R2 are independently C4-22alkyl, C3-18alkenyl, C3-8cycloalkyl, arylC1-8alkyl, or a group having the formula â€”CmH2m+1(Oâ€”CnH2n)x, â€”CmH2m+1(OC(O)â€”CvH2v)x or â€”Zâ€”C6H4(Oâ€”CnH2n)x; wherein Z is C1-12alkylene; R3 is â€”CiH2iâ€”, â€”(CpH2pâ€”Oâ€”CpH2p)q, or a mixture thereof; and R4 is CH3 or hydrogen; wherein i is from about 2 to about 12; p is from about 2 to about 4; q is from 1 to about 10; m is 1-22; n is 2-4; x is 1-15; and v is 4 or 5; in an aprotic solvent in the presence of a lithium salt; provided that R1 and R2 are different.