Organopolysiloxane/polyurethane elastomeric block copolymers

Details Organopolysiloxane/polyurethane elastomeric block copolymers Organopolysiloxane/polyurethane elastomeric block copolymers

1982-09-24

1985-05-21

Briggs, Sr., Wilbert J.

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

Synthetic resins

From silicon reactant having at least one...

525474, 528 28, 528 29, 528 31, 528 33, C08G 1861, C08G 7726, C08G 7742

Patent

active

045187584

ABSTRACT:
Novel organopolysiloxane/polyurethane block copolymers which are thermoplastic elastomers and which possess good thermomechanical properties, are comprised of the following recurring units (A) and (B): ##STR1## wherein Z is a divalent radical which comprises a polysiloxane block and has the formula: ##STR2## in which Y and Y' are each a divalent radical having one of the formulae: ##STR3## wherein T and T' comprise the divalent or trivalent residue having from 1 to 20 carbon atoms of an unsaturated isocyanate or alcohol having one of the formulae:

REFERENCES:
patent: 3562352 (1971-02-01), Nyilas
patent: 4098742 (1978-07-01), Mueller
Chemical Abstracts, 86, 122592, (1977).

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