Single-dip process for achieving a layer-by-layer-like coating
First Claim
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1. A method of coating a polymeric substrate comprising the steps of:
- forming a solution, said solution containing a negatively charged material and a positively charged material in an amount such that the molar charge ratio of said solution is from about 3;
1 to about 100;
1;
maintaining the pH of said solution within a range so that said negatively charged material and said positively charged material remain stable within said solution; and
applying said solution to said substrate to form a coating thereon, said coating on said substrate having at least two layers so that one of said layers comprises said negatively charged material and another of said layers comprises said positively charged material.
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Abstract
A method of forming a coating of polyionic materials in a layer-by-layer-like manner onto a polymeric material is provided. A polymeric material, such as a contact lens, can be dipped once into a solution of polyionic materials such that layers of polyionic material can be formed thereon. A single dip solution of the present invention typically contains a polyanionic material and a polycationic material in a non-stoichiometric amount and maintained within a certain pH range.
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Citations
31 Claims
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1. A method of coating a polymeric substrate comprising the steps of:
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forming a solution, said solution containing a negatively charged material and a positively charged material in an amount such that the molar charge ratio of said solution is from about 3;
1 to about 100;
1;
maintaining the pH of said solution within a range so that said negatively charged material and said positively charged material remain stable within said solution; and
applying said solution to said substrate to form a coating thereon, said coating on said substrate having at least two layers so that one of said layers comprises said negatively charged material and another of said layers comprises said positively charged material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
dispensing a polymeric material into said mold;
curing said polymeric material so that said coating detaches from said mold during curing and at least partially attaches to the exterior surface of said polymeric material; and
removing said cured polymeric material from said mold, said polymeric material being coated with at least a portion of said solution.
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19. A method as defined in claim 18, further comprising the step of preconditioning said mold with a primer coating.
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20. A method as defined in claim 1, wherein said coating has at least two layers such that one of said layers consists essentially of said negatively charged material and another of said layers consists essentially of said positively charged material.
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21. A method of coating a contact lens comprising the steps of:
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forming a polyionic solution, said solution containing a polyanionic material and a polycationic material in an amount such that the molar charge ratio of said solution is less than about 10;
1;
maintaining the pH of said solution within a range so that said polyanionic and polycationic materials remain stable within said solution; and
dipping said contact lens into said solution to form a hydrophilic coating thereon, said coated substrate having at least two layers such that one of said layers comprises said polyanionic material and another of said layers comprises said polycationic material. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of coating a polymeric material comprising the steps of:
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providing a substrate;
applying a first polyionic material to said substrate, said first polyionic material having a certain charge;
applying an additive to said substrate, said additive having substantially no charge;
applying a second polyionic material to said substrate after applying said additive thereto, said second polyionic material having a charge opposite to said charge of said first polyionic material;
applying a solution to said substrate to form a coating thereon, said solution containing a polyanionic material and a polycationic material in an amount such that the molar charge ratio of said solution is from about 3;
1 to about 100;
1, wherein the pH of said solution is maintained within a range so that said polyanionic material and said polycationic material remain stable within said solution; and
said coated substrate having at least two layers such that one of said layers comprises said polyanionic material and another of said layers comprises said polycationic material, said two layers substantially entrapping said additive on said coated substrate.
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Specification