| CPC C11D 3/0078 (2013.01) [A61L 12/00 (2013.01); A61L 12/06 (2013.01); C11D 1/662 (2013.01); C11D 3/044 (2013.01); C11D 3/2068 (2013.01); C11D 2111/44 (2024.01); C11D 2111/46 (2024.01)] | 13 Claims |
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1. A single-pass process for cleaning a hard-coated ophthalmic lens and stripping at least a portion of the hard-coated ophthalmic lens, the process comprising the steps of:
treating by submerging the hard-coated ophthalmic lens with a cleaning solution to produce a cleaned hard-coated ophthalmic lens, said cleaning composition comprising:
10 wt. % to 40 wt. % of an organic solvent;
1 wt. % to 20 wt. % of an alkaline component comprising sodium hydroxide and/or potassium hydroxide;
0.5 wt. % to 3 wt. % of a surfactant comprising alkyl polyglucoside; and
a balance of water;
treating by submerging the cleaned hard-coated ophthalmic lens with an alkaline solution to produce an alkaline-treated hard-coated ophthalmic lens; and
treating by submerging the alkaline-treated hard-coated ophthalmic lens with a stripping solution to strip at least a portion of the hard-coat from the alkaline-treated hard-coated ophthalmic lens to produce a cleaned and stripped ophthalmic lens, said stripping composition comprising:
10 wt. % to 40 wt. % of an organic solvent;
1 wt. % to 20 wt. % of an alkaline component which is sodium hydroxide and/or potassium hydroxide;
0.5 wt. % to 6 wt. % of a surfactant comprising alkyl polyglucoside; and
a balance of water;
wherein each of the treating steps is independently performed at a temperature that is at least 10° C. greater than ambient temperature, and wherein ultrasonic power is transmitted to the ophthalmic lens during all of the treating steps with a frequency of about 25% to 45% of a full scale frequency level of 33 Mhz, and a duration of each treating step is in a range of 1 to 8 minutes.
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