发明名称 |
Method for making transparent polythiourethane substrates in particular optical substrates |
摘要 |
A method of fast curing polythiourethane transparent casted substrate, usable for making optical articles such as ophthalmic lenses, which comprises the steps of: 1) Providing a first component A comprising a polythiourethane prepolymer having isocyanate or isothiocyanate end groups and a viscosity at 25° C. ranging from 0.02 to 0.4 Pa.s; 2) Providing a second component B comprising a polythiourethane prepolymer having thiol (SH) end groups and a viscosity at 25° C. ranging from 0.2 to 2.0 Pa.s; 3) Mixing together first and second components A and B and filling a moulding cavity of a casting mould assembly with the resulting mixture; 4) Curing said mixture to obtain a transparent solid substrate, said curing step comprising: a) a first step for polymerizing said mixture to obtain a gel within 1 to 10 minutes; and b) a second step of post-curing the gel to obtain the transparent solid substrate; and 5) Recovering the transparent solid substrate from the mould.
|
申请公布号 |
US2003125410(A1) |
申请公布日期 |
2003.07.03 |
申请号 |
US20010012727 |
申请日期 |
2001.11.05 |
申请人 |
ESSILOR INTERNATIONAL COMPAGNIE GENERALE D'OPTIQUE |
发明人 |
KEITA GABRIEL;OBORDO JOEY O.;MCCLIMANS PAMELA ANNE;TURSHANI YASSIN YUSEF |
分类号 |
C08G18/72;C08G18/10;C08G18/38;G02B1/04;(IPC1-7):C08K3/00;C08J3/00 |
主分类号 |
C08G18/72 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|