Crosslinked hydrogel coatings
AssigneeC.R. Bard, Inc.
InventorsRichard Elton, Margret Opolski
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Abstract
A hydrophilic, lubricious, durable, flexible, coating comprising a crosslinked polyurea matrix complexed with a hydrophilic polymer selected from the group consisting of poly (ethylene oxide) and polyvinylpyrrolidone, said crosslinked polymer formed from the reaction of an isocyanate and a compound having at least two active hydrogens per molecule selected from the group consisting of polyamines, polymercaptans, and polycarboxylates or compounds with NH, NH.sub.2, SH or COOH groups on same molecule in the presence of said hydrophilic polymer, with the total sum of the average isocyanate functionality plus the average active hydrogen functionality exceeding 4 and the molar ratio of total NCO groups to total active hydrogens being at least 0.8.
Claims16
A hydrophilic, lubricious, durable, flexible, coating comprising a crosslinked polyurea complexed with a hydrophilic polymer selected from the group consisting of poly (ethylene oxide) and polyvinylpyrrolidone said crosslinked polymer formed from the reaction of an isocyanate and a compound having at least two active hydrogens per molecule selected from the group consisting of polyamines, polymercaptans, and polycarboxylates or compounds with NH, NH.sub.2, SH or COOH groups on same molecule in the presence of said hydrophilic polymer, with the total sum of the average isocyanate functionality plus the average active hydrogen functionality exceeding 4 and the molar ratio of total NCO groups to total active hydrogens being at least 0.8.
An article comprising a substrate and a durable, flexible hydrophilic, lubricious organic coating adhered thereto, said coating formed from the reaction on the surface of the substrate to be coated, of a mixture comprising an isocyanate, a compound having at least two active hydrogens per molecule selected from the group consisting of polyamines, polymercaptans, and polycarboxylates or compounds with NH, NH.sub.2, SH or COOH groups on same molecule, in the presence of said hydrophilic polymer, with the total sum of the average isocyanate functionality plus the average active hydrogen functionality exceeding 4 and the molar ratio of total NCO group to total active hydrogens being at least 0.8 and a hydrophilic polymer selected from the group consisting of a poly(ethylene oxide) and a polyvinylpyrrolidone in a carrier liquid to form a coating of a crosslinked polyurea matrix complexed with the hydrophilic polymer having good adherence to the substrate and a very low coefficient of friction when wetted with water.
A method of preparing a durable, flexible hydrophilic lubricious, organic coating on a substrate to be coated;
- said method comprising forming a coating mixture of an isocyanate, and a compound having at least two active hydrogens per molecule selected from the group consisting of polyamines, polymercaptans, and polycarboxylates or compounds with NH, NH.sub.2, SH or COOH groups on same molecule in the presence of said hydrophilic polymer, with the total sum of the average isocyanate functionality plus the average active hydrogen functionality exceeding 4 and the molar ratio of total NCO groups to total active hydrogens being at least 0.8, the resulting polymer matrix formed in situ upon curing being a crosslinked polyurea and a hydrophilic polymer selected from the group consisting of a poly(ethylene oxide) and a polyvinylpyrrolidone in a carrier liquid applying said mixture to the substrate, removing at least a portion of said carrier diluent, and then curing to form a coating of a crosslinked polyurea - hydrophilic polymer, said coating having good adherence to the substrate and good antifriction properties.
Dependencies are inferred from the claim text.