Pad transfer printing method for making colored contact lenses

The invention provides a method for producing colored contact lenses with high quality color images. The method of the invention comprises the steps of (a) providing a water based ink in at least one cliche wherein a pattern to be printed on the contact lens has been created; (b) transferring the wa...

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Bibliographische Detailangaben
1. Verfasser:	ATKINS BARRY L.,DOERR NORBERT,FISCHER ALFRED,QUINN MICHAEL HUGH,SCHMIEDER ROLAND,TUCKER ROBERT CAREY
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CONTACT LENSES DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM DYEING OR PRINTING TEXTILES FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR LAUNDERING OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PERFORMING OPERATIONS PHYSICS PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE SPECTACLES SPRAYING OR ATOMISING IN GENERAL SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES TEXTILES TRANSPORTING TREATMENT OF TEXTILES OR THE LIKE WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The invention provides a method for producing colored contact lenses with high quality color images. The method of the invention comprises the steps of (a) providing a water based ink in at least one cliche wherein a pattern to be printed on the contact lens has been created; (b) transferring the water based ink from the cliche to at least one surface of at least one contact lens forming mold by means of at least one transfer pad; (c) at least partially curing the ink transferred on the mold to form a colored film; (d) dispensing a hydrogel lens-forming material into the mold; and (e) curing the lens-forming material within the mold to form the contact lens, whereby the colored film detaches from the molding surface and becomes integral with the body of the contact lens; characterized in that the relative air humidity in the immediate vicinities of the transfer pad/s is kept higher than 50% at standard pressure and temperature conditions during ink transfer.