Minnesota Mining and Manufacturing Company

Gary T Wiederholt

Jerome J Hoffman

Leonard A Tushaus

Audrey A Sherman

Charles M Leir

William R Bronn

Charles M Leihr

Mjeczyslaw H Mazurek

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.

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

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 a method of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.

Block copolymer, method of making the same, dimaine precursors of the

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West St. Paul, MN, United States of America

Gary T Wiederholt