Patent ID: 7081139

Claim:
A method for preparing an antimicrobial polyester-containing article having chitosan grafted thereon comprising the sequential steps of: (a) providing a polyester-containing article; (b) contacting the polyester-containing article with a basic solution; (c) optionally, washing the article produced in step (b); (d) contacting the article produced in step (b) or step (c) with a strong mineral acid solution; (e) optionally, washing the article produced in step (d); (f) contacting the article produced in step (d) or step (e) with a solution comprising a chitosan agent selected from the group consisting of chitosan, chitosan salts and chitosan derivatives wherein the chitosan is grafted thereon the polyester-containing article; (g) optionally, heating the article produced in step (f); (h) isolating the article produced instep (f) or step (g); and (i) optionally, heating the article isolated in step (h) at a temperature higher than the temperature employed in step (g).