Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2011-05-17
2011-05-17
Bernshteyn, Michael M (Department: 1762)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S244000, C525S280000, C524S556000, C526S317100, C526S319000
Reexamination Certificate
active
07943703
ABSTRACT:
A method of creating a bioadhesive in a substantially aqueous environment is disclosed. The method includes the steps of placing an anionicially polymerized block copolymer containing an amide, which is prepared by reacting a difunctional anionic initiator with a sterically hindered ester of methacrylic acid (SEMA), into a solvent to allow the solvent to swell the block copolymer; reacting the anionically polymerized hindered ester of methacrylic acid with methacrylic acid (MMA); hydrolyzing the anionically polymerized block copolymer with an aqueous solution to afford a methyl methacrylate-methacrylic acid-methyl methacrylate block copolymer (MMA-MAA-MMA); reacting the MMA-MAA-MMA block copolymer with 3,4-dihydroxyphenyl alanine to afford an amide with the MAA portion of the block copolymer; and placing the solvent swollen block copolymer in water. The water is exchanged with the solvent to provide a bioadhesive in an aqueous environment.
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Guvendiren Murat
Lee Bruce P.
Messersmith Phillip B.
Shull Kenneth R.
Bernshteyn Michael M
Northwestern University
Quarles & Brady LLP
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