Block copolymer, method of making the same, diamine precursors of the same, method of making such diamines and end products comprising the block copolymer

US5512650A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Charles M. Leir · New Richmond, US
• Jerome J. Hoffman · Yankton, US
• Leonard A. Tushaus · White Bear Lake, US
• Gary T. Wiederholt · West St. Paul, US
• Mjeczyslaw H. Mazurek · Roseville, US
• Audrey A. Sherman · Windom, US
• William R. Bronn · Maplewood, US

Key dates

• Filing date: Jul 21, 1993
• Grant date: Apr 30, 1996
• Expiry date: Jul 21, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/40
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.