Modified acrylic block copolymers for hydrogels and pressure sensitive wet adhesives
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United States of America Patent
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May 17, 2011
Grant Date -
Dec 3, 2009
app pub date -
Feb 27, 2009
filing date -
Feb 16, 2006
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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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