Processes for preparing bis(urea-urethane) compounds

Details Processes for preparing bis(urea-urethane) compounds Processes for preparing bis(urea-urethane) compounds

2005-04-01

2009-08-18

Oh, Taylor Victor (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S158000

Reexamination Certificate

active

07576235

ABSTRACT:
Processes for preparing bis(urea-urethane) compoundswherein R1is alkyl, aryl, arylalkyl, or alkylaryl, R2is alkylene, arylene, arylalkylene, or alkylarylene, R3is alkylene, arylene, arylalkylene, or alkylarylene, and R4is hydrogen or alkyl, comprising: (1) first bring to a reaction temperature of about 20-125° C. a reaction mixture comprising monoalcohol reactant R1—OH and diisocyanate reactant OCN—R2—NCO, the monoalcohol being present in an amount of about 0.8-1.2 moles monoalcohol per mole diisocyanate, the monoalcohol and diisocyanate reactants being admixed in a solvent, the reactants and solvent being present in relative amounts of at least about 1 milliliter solvent per millimole diisocyanate, the reaction temperature continuing until reaction between the monoalcohol and the diisocyanate is complete; and (2) subsequent to step (1), adding to the reaction mixture diaminewithout isolating the reaction product of step (1), thereby forming compound of the formulain desirably high yield and purity.

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