Title:
【発明の名称】ヒドロゲル材料をバット染料で着色する方法
Document Type and Number:
Japanese Patent JPH10501310
Kind Code:
A
Abstract:
Disclosed are processes for tinting hydrogel materials, such as contact lenses, by dissolving a leuco sulfate ester of a vat dye in an compatible monomer solution, adding an oxidizing initiator to the monomer solution, and oxidizing and polymerizing the monomer solution and dye in the same solution. In one aspect, the oxidation and polymerization are conducted simultaneously whereas in another embodiment, the oxidation of the soluble leuco sulfate ester of a vat dye to the insoluble vat dye and polymerization are conducted sequentially in the same reaction medium.
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Inventors:
Evans John M
Application Number:
JP50221396A
Publication Date:
February 03, 1998
Filing Date:
May 26, 1995
Export Citation:
Assignee:
Pilkington Burns Hind Inc.
International Classes:
C09B9/00; D06P1/00; D06P1/28; D06P1/52; D06P1/92; D06P3/00; D06P3/34; D06P5/00; G02B1/04; (IPC1-7): D06P5/00; C09B9/00
Attorney, Agent or Firm:
Akihide Sugimura (6 others)