Polymeric urea-urethane rheology control agents and a process for their preparation

   
   

The invention relates to a polymeric urea-urethane obtainable by first reacting a diisocyanate with a polyol to form a doubly NCO-terminated urethane prepolymer. Further reaction is subsequently carried out with a mixture of a primary monoamine and a primary diamine. After the second reaction the polymeric urea-urethane present is substantially free of isocyanate and of the monoamine and diamine used. It can be used as an agent for controlling the rheology of liquid polymers or polymer solutions.

La invención se relaciona con un urea-urea-urethane polimérico obtenible primero reaccionando un diisocyanate con un polyol para formar doble un prepolymer del urethane de NCO-terminated. La reacción adicional se realiza posteriormente con una mezcla de un monoamine primario y de una diamina primaria. Después de que la segunda reacción el presente polimérico del urea-urea-urethane esté substancialmente libre del isocianato y del monoamine y de la diamina usados. Puede ser utilizada como agente para controlar el rheology de polímeros o de soluciones líquidos del polímero.

 
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