发明授权
US5837797A Process for preparing a sulfur-containing urethane-based plastic lens
and the lens prepared thereby
失效
制备含硫氨基甲酸酯类塑料透镜及其制备的透镜的方法
- 专利标题： Process for preparing a sulfur-containing urethane-based plastic lens and the lens prepared thereby
- 专利标题（中）： 制备含硫氨基甲酸酯类塑料透镜及其制备的透镜的方法
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申请号： US753436申请日： 1996-11-25
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公开(公告)号： US5837797A公开(公告)日： 1998-11-17
- 发明人: Koju Okazaki , Yoshinobu Kanemura , Teruyuki Nagata
- 申请人： Koju Okazaki , Yoshinobu Kanemura , Teruyuki Nagata
- 申请人地址： JPX Tokyo
- 专利权人： Mitsui Toatsu Chemicals, Inc.
- 当前专利权人： Mitsui Toatsu Chemicals, Inc.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX6-006792 19940126
- 主分类号： G02B1/04
- IPC分类号： G02B1/04 ; C07C319/20 ; C07C321/14 ; C08G18/30 ; C08G18/38 ; C08G18/52 ; C08G18/77
摘要：
A novel polythiol having four or more functional groups, a process for producing the polythiol comprising reacting thiourea with a specific compound, a sulfur-containing urethane-based resin prepared from the polythiol and a lens made of the resin. The resin has a high refractive index, and low dispersion of refractive index, is lightweight, colorless and transparent, has no optical distortion, and has excellent characteristics in weatherability, dye-affinity, heat resistance, impact resistance and machinability.
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