Patent ID: 6495651
Filing Date: 2002-12-17
Classification: C08G

Abstract:
A process for preparing a urethane compound for medical instruments, characterized by reacting a hydroxyl compound (A) with an isocyanate compound (B) in the presence of an organic iron compound as a reaction catalyst to give a urethane compound (I), wherein(i) at least one member of dihydroxyl compounds (A-2) as the hydroxyl compound (A) is reacted with at least one member of diisocyanate compounds (B-2) as the isocyanate compound (B) to give a compound having isocyanate groups in its both ends through at least two urethane bonds or a compound having hydroxyl groups in its both ends through at least two urethane bonds; and (ii) (a) said compound having isocyanate groups in its both ends is reacted with at least one member of monohydroxyl compounds (A-1) as the hydroxyl compound (A), or (b) said compound having hydroxyl groups in its both ends is reacted with at least one member of monoisocyanate compounds (B-1) as the isocyanate compound (B) to give a compound (I) having at least four urethane bonds.