Title:
CONTACT LENS
Document Type and Number:
Japanese Patent JPS60225115
Kind Code:
A
Abstract:
PURPOSE: To obtain contact lenses high in oxygen permeability and usable in contact with eyes for a long time by molding and finishing a polymer essentially consisting of polytrimethylvinylsilane.
CONSTITUTION: Purified trimethylvinylsilane monomer is used as a starting material, and anion bulk polymn. is executed at 50W70°C in an inert gas atm. in the presence of n-butyl lithium or the like as a catalyst to obtain polytrimethylvinylsilane having a high mol.wt. of ≥200,000. This polymer is superior in oxygen permeability, high in mechanical strength and superior in workability, too. If its polymn. degree is lower than 200,000, the polymer becomes not sufficient in mechanical strength and difficult in fine precise mechanical working.
Inventors:
TAKAMIZAWA MINORU
YAMAMOTO AKIRA
ISHIHARA TOSHINOBU
NAGURA SHIGEHIRO
YAMAMOTO AKIRA
ISHIHARA TOSHINOBU
NAGURA SHIGEHIRO
Application Number:
JP8152684A
Publication Date:
November 09, 1985
Filing Date:
April 23, 1984
Export Citation:
Assignee:
SHINETSU CHEM IND CO
International Classes:
C08F30/00; C08F30/08; C08G77/00; C08G77/42; G02B1/04; G02C7/04; (IPC1-7): C08F30/08; C08G77/42
Attorney, Agent or Firm:
Ryoichi Yamamoto