Organopolysiloxane-polyurea block copolymer release agents
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United States of America Patent
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Mar 1, 1994
Issued Date -
N/A
app pub date -
Aug 31, 1992
filing date -
Jun 20, 1986
priority date (Note) -
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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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