Method and composition for incorporating radiation-absorbing age

Details Method and composition for incorporating radiation-absorbing age Method and composition for incorporating radiation-absorbing age

1998-08-27

2000-11-21

Liott, Caroline D.

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing process utilizing electric, magnetic, or wave energy;...

8506, 8507, 8543, 8647, 351159, 351160R, 351162, 351177, D06P 520, D06P 358, G02C 702, G02C 704

Patent

active

061496928

ABSTRACT:
A method of incorporating dyes into polymeric materials. The method involved contacting a functionalized dye with a high molecular weight crosslinkable polymer precursor, dispensing the solution into a mold and applying radiation, thereby forming a molded article having dye covalently bonded to the polymer backbone. A preferred product is a visibility tinted disposable contact lens comprising poly(vinyl alcohol). Various embodiments of the innovative method offer advantages in reduced fabrication cycles, reduced extractables, elimination of post-polymerization activation steps, elimination of post-polymerization extraction steps and reduced scrap and costs associated with lens handling.

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