Organopolysiloxane/polyurea/polyurethane block copolymers

Details Organopolysiloxane/polyurea/polyurethane block copolymers Organopolysiloxane/polyurea/polyurethane block copolymers

2006-04-11

2006-04-11

Zimmer, Marc S. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

C528S028000, C528S029000, C528S044000, C528S085000

Reexamination Certificate

active

07026424

ABSTRACT:
Organopolysiloxane/polyurea/polyurethane block copolymer elastomers exhibiting improved physical properties are prepared by reacting diisocyanates with aminoalkyl-functional organopolysiloxanes containing substantially no cyclic siloxanes, prepared by reacting a cyclic silazane with a bis(hydroxy)-organopolysiloxane. Traditional hydroxyl and amino-functional chain extenders may be reacted as well, to produce a wide range of block copolymer elastomers.

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