- Poly(oxyalkylene) substituted xanthene colorant and method for making the same
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A diamino-xanthene colorant is provided having the following structure: STR1 where Y is a poly(oxyalkylene) substituent having a straight or branched polymer chain of at least 3 monomer units selected from ethylene oxide, propylene oxide, butylene oxide and glycidol; R1 and R2 are independently selected from H, C1-C4 alkyl, C1-C4 alkoxy, Cl, Br and I; X is selected from H, SO3 --, CO2 -- and COOR3, where R3 is C1-C4 alkyl or aryl; and each Z is independently selected from SO3 --, CO2 --, COOR4, Cl and OH, where R4 is C1-C4 alkyl or aryl, and n is 0, 1, or 2; the colorant is synthesized by condensing two moles of an N,N-bis(poly(oxyalkylene))-p-methoxyaniline and o-formylbenzene sulfonic acid.
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