ApplicationNo. 536365 filed on 12/26/1974
US Classes:528/65, With reactant having two -XH groups428/425.1, Next to cellulosic525/453, Solid polymer derived from -N=C=X reactant and polyhydroxy reactant528/71Reactant contains at least one salt group, e.g., quaternary ammonium salt, etc.
ExaminersPrimary: Welsh, M. J.
Attorney, Agent or Firm
AbstractCationic polyurethanes and a process for their production wherein a polyisocyanate, preferably a diisocyanate such as 2,4- or 2,6-tolylene-diisocyanate is reacted with an aliphatic dihydroxy compound substituted with an aliphatic side-chain of at least 10 carbon atoms to form a preliminary adduct or so-called prepolymer with terminal -- NCO groups. This prepolymer is then reacted for chain-lengthening with an aliphatic monomeric diol (A) containing a tertiary nitrogen atom convertible into an ammonium compound or an aliphatic monomeric diol (B) containing a tertiary nitrogen atom already converted into an ammonium compound. The new cationic polyurethanes are especially useful as sizing agents for the sizing of paper.