Multilayer materials
First Claim
1. A composite materials having at least one wettable surface capable of holding a continuous layer of aqueous fluid therein, which material comprises:
- (a) a bulk base material, and (b) a hydrophilic coating, wherein the hydrophilic coating consists of a carbohydrate directly and covalently attached to amino groups at the surface of the bulk base material, wherein said amino groups are either inherently (a priori) present in the base material or have been attached to the surface of the bulk base material by plasma surface treatment.
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Accused Products
Abstract
The invention is directed to a composite material, especially a biomedical device, e.g. an ophthalmic device, preferably a contact lens, with one or more wettable surfaces capable of holding a continous layer of aqueous fluid thereon which composite material comprises a bulk material and a hydrophilic coating characterized in that the hydrophilic coating consists of a carbohydrate attached covalently to reactive groups at the surface of the bulk material, either directly or via functional groups of an oligofunctional compound, said oligofunctional compound in turn having functional groups being capable of reacting with said reactive groups at the surface of the bulk material and with the carbohydrate, wherein said reactive groups are either inherently (a priori) present in the bulk material or wherein said reactive groups have been attached to the surface of the bulk material by a plasma surface preparation, as well as to a process of manufacture of such a composite material.
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Citations
22 Claims
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1. A composite materials having at least one wettable surface capable of holding a continuous layer of aqueous fluid therein, which material comprises:
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(a) a bulk base material, and (b) a hydrophilic coating, wherein the hydrophilic coating consists of a carbohydrate directly and covalently attached to amino groups at the surface of the bulk base material, wherein said amino groups are either inherently (a priori) present in the base material or have been attached to the surface of the bulk base material by plasma surface treatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18)
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14. A process for the manufacture of a wettable composite material with one or more wettable surface capable of holding a continuous layer of aqueous fluid thereon, wherein said composite material includes a bulk base material and a hydrophilic coating of a carbohydrate directly attached covalently to amino groups at the surface of the base materials, said process comprising the steps of:
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(1) covalently attaching amino groups onto the surface of a preformed base material by subjecting the preformed base material to a gas plasma established in a vapor containing at least one amine compound;
(2) optionally treating the carbohydrate with a reagent which modifies said carbohydrate such that said carbohydrate is capable of reacting with the amino groups;
(3) reacting said amino groups on the surface with the carbohydrate to immobilize the carbohydrate onto the surface; and
(4) optionally treating the surface-immobilized carbohydrate with a reagent to stabilize the bond between the carbohydrate and the surface. - View Dependent Claims (19, 20, 21, 22)
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Specification