Patent ID: 6452020
Filing Date: 2002-09-17
Classification: C07D,C09B

Abstract:
A method of producing a substantially phthalate-free xanthene colorant comprising the steps of(a) providing an aminophenol derivative intermediate comprising at most a total of three moles of a constituent selected from the group of oxyalkylene groups having from 3 to 12 carbon atoms, alkoxy alkylester groups having from 3 to 12 carbon atoms, glycidol, and a glycidyl group wherein said constituent is solely bonded to the amine, and wherein of all of the hydroxyl moieties present on said intermediate, at least one is isocyanate-capped and thus forms a urethane moiety; and (b) reacting said aminophenol derivative intermediate of step â€œaâ€  with a phthalic anhydride-containing compound.