Minnesota Mining and Manufacturing Company

Jerome J Hoffman

Charles M Leir

John E Stark

Leonard A Tushaus

Gary T Wiederholt

Audrey A Sherman

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

The present invention provides a method for making primary amine terminated linear polyethers of molecular weight above about 3500 which have virtually no contamination from in-chain secondary amine functionalities or amine-terminated tertiary amine side-chains. This method involves the production of novel intermediates. The invention also provides purely linear polyether-polyurea block copolymers formed by chain extension of the primary amine terminated linear polyethers.

Method of making purely primary diamines

Method of making purely primary diamines from nitrogen containing

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Hastings, MN, United States of America

Jerome J Hoffman