Diblock and triblock polydiorganosiloxane-polyurea block copolymers
AssigneeMinnesota Mining and Manufacturing Company
InventorsCharles M. Leir, William R. Bronn, Patricia J. A. Brandt
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Abstract
Diblock (B-A) and triblock (B-A-B) polydiorganosiloxane-polyurea block copolymers comprise non-functional polydiorganosiloxane endblock B and polyurea block A. When used to provide release coatings, the block copolymers allow for easier release compared to traditional block copolymers of the (AB).sub.n type having comparable amounts of polydiorganosiloxane. Articles incorporating the copolymers as a release material are also disclosed.
Claims12
A block copolymer having the structure B-A-X wherein B comprises a non-functional polydiorganosiloxane endblock derived from a monoamine-functional polydiorganosiloxane, A comprises a polyurea block, and X is selected from the group consisting of hydrogen, a non-functional polydiorganosiloxane endblock, or an isocyanate radical.
Dependencies are inferred from the claim text.