POLYSILOXANE-POLYUREA BLOCK COPOLYMERS Polysiloxane-polyurea block copolymers are prepared from isocyanate and aminophenoxy functional polyorganosiloxane. These block copolymers are hydrolytically stable and exhibit improved thermal stability compared to aminoalkyl functional polyorganosiloxanes.
POLYSILOXANE-POLYUREA BLOCK COPOLYMER