Title: Process for preparation of polyurethane base resin for making lens
Application Number: 95115109 Application Date: 1995.08.14
Publication Number: 1130641 Publication Date: 1996.09.11
Approval Pub. Date: 1998.04.08 Granted Pub. Date: 1998.04.08
International Classifi-cation: C08G18/72;G02B1/04
Applicant(s) Name: Mitsui Toatsu Chemicals, Inc. Address:
Inventor(s) Name: Teruyuki Nagata;Koju Okazaki;Nobuyuki Kajimoto
Attorney & Agent: WEI JINXI
Abstract:
    Polyurethane base lens resins obtained by reacting one or more of sulfur-containing polyisocyanates compound with one or more of sulfur-containing polyols, and polyurethane base lenses comprising these resins are disclosed. A method for preparing polyurethane base lenses which comprises adding internal mold releasing agents to the mixture of the above polyisocyanates and polyols prior to casting polymerization is also disclosed.
Time: 10
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