Process for surface modifying substrates and modified substrates resulting therefrom
First Claim
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1. A method for modifying the surface of an article, said method comprising the steps of:
- a) depositing at least a polyelectrolytic tie layer onto the surface of said article, wherein said polyelectrolytic tie layer is composed of (i) one layer of a first polyionic material which is adsorbed onto, heteropolarly bound onto, and/or entraped on the surface of the article or (ii) at least one layer of the first polyionic material which is adsorbed onto, heteropolarly bound onto, and/or entraped on the surface of the article and at least one layer of a second polyionic material having charges opposite of the charges of the first polyionic material, wherein said first and second polyionic materials have functional group which provide reactive sites; and
b) covalently linking a layer of an active agent to said reactive sites, wherein the active agent is an anti-microbial agent or a polymerization initiator capable of initiating a radical polymerization of ethylenically unsaturated compounds.
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Abstract
The present invention generally relates to a method of modifying the surface of substrates such as contact lenses and other biomedical articles by at least partially coating the surfaces of such substrates with a polymeric tie layer having reactive sites. Various other moieties may then be chemically attached to the article surface by reaction of the other moieties with the reactive sites through classical chemical attachment mechanisms.
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Citations
19 Claims
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1. A method for modifying the surface of an article, said method comprising the steps of:
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a) depositing at least a polyelectrolytic tie layer onto the surface of said article, wherein said polyelectrolytic tie layer is composed of (i) one layer of a first polyionic material which is adsorbed onto, heteropolarly bound onto, and/or entraped on the surface of the article or (ii) at least one layer of the first polyionic material which is adsorbed onto, heteropolarly bound onto, and/or entraped on the surface of the article and at least one layer of a second polyionic material having charges opposite of the charges of the first polyionic material, wherein said first and second polyionic materials have functional group which provide reactive sites; and
b) covalently linking a layer of an active agent to said reactive sites, wherein the active agent is an anti-microbial agent or a polymerization initiator capable of initiating a radical polymerization of ethylenically unsaturated compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification