Block copolymer, method of making the same, dimaine precursors of the same, method of making such diamines and end products comprising the block copolymer
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United States of America Patent
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May 25, 1993
Issued Date -
N/A
app pub date -
Nov 16, 1990
filing date -
Jun 20, 1986
priority date (Note) -
Expired
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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 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.
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