Process for graft polymerization on surfaces of preformed substates to modify surface properties
First Claim
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1. A process for modifying the surface characteristics of a preformed ophthalmic lens to impart altered properties thereto by graft polymerization on said lens which comprises:
- placing the lens in a plasma to form free radicals on the lens contacting the lens having free radicals with oxygen to form hydroperoxy groups on the surface of the lens; and
graft polymerizing an ethylenically unsaturated oligomer or polymer onto the surface of the lens in the presence of a cross-linking agent.
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Abstract
The invention relates to a process for modifying the surface characteristics of a preformed polymer substrate to impart altered properties thereto by graft polymerization on the substrate which includes: placing the polymer substrate in a plasma to form free radicals on the substrate; contacting the substrate having free radicals with oxygen to form hydroperoxy groups on the surface of the substrate; and graft polymerizing an ethylenically unsaturated monomer onto the surface of the polymer substrate.
98 Citations
26 Claims
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1. A process for modifying the surface characteristics of a preformed ophthalmic lens to impart altered properties thereto by graft polymerization on said lens which comprises:
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placing the lens in a plasma to form free radicals on the lens contacting the lens having free radicals with oxygen to form hydroperoxy groups on the surface of the lens; and graft polymerizing an ethylenically unsaturated oligomer or polymer onto the surface of the lens in the presence of a cross-linking agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16)
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14. A process as recited in claim, wherein said oligomer or polymer has a molecular weight of about 500 to 5000.
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17. A contact lens which has been surface treated by a process comprising:
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(a) placing the contact lens in a plasma to form free radicals on the contact lens; (b) contacting the contact lens having free radicals with oxygen to form hydroperoxy groups on the surface of the contact lens; and (c) graft polymerizing an ethylenically unsaturated oligomer or polymer onto the surface of the contact lens in the presence of a cross-linking agent.
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18. A process for modifying the surface characteristics of an ophthalmic lens to impart altered properties thereto by graft polymerization on said lens, which process comprises the steps of:
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(a) placing the lens in a plasma to form free radicals on the lens; (b) contacting the lens having free radicals with oxygen to form hydroperoxy groups on the surface of the lens; and (c) graft polymerizing an ethylenically unsaturated oligomer or polymer, in the presence of a cross-linking agent, onto the surface of the lens, said oligomer or polymer having a molecular weight between about 200 and 100,000. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification