Block copolymer, method of making the same, diamine precursors o

Details Block copolymer, method of making the same, diamine precursors o Block copolymer, method of making the same, diamine precursors o

1993-07-21

1996-04-30

Dean, Ralph H.

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

Synthetic resins

From silicon reactant having at least one...

528 22, 528 37, 528 38, C08G 7708

Patent

active

055126502

ABSTRACT:
Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and methods of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.

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Chemistry and Technology of Silicones, by Walter Noll, published by the Academic Press, Inc., pp. 226-229 (1966).
Polymer, vol. 25, pp. 1800-1816, Dec. 1984.
Abstract No. 89-188438, Release agent for adhesive tape, etc. comprises resin having siloxane! segments, other release material and solvents.
Polymer, vol. 25, pp. 1800-1806, Dec. 1984 Iskender Yilgor, Ahmad K. Sha'aban, Warren P. Steckle, Jr. Dinesh Tyagi, Garth L. Wilkes and James E. McGrath.

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