发明名称 |
Method for making transparent polythiourethane substrates in particular optical substrates |
摘要 |
<p>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.</p> |
申请公布号 |
AU2002351825(B2) |
申请公布日期 |
2008.02.14 |
申请号 |
AU20020351825 |
申请日期 |
2002.11.04 |
申请人 |
ESSILOR INTERNATIONAL COMPAGNIE GENERALE D'OPTIQUE |
发明人 |
GABRIEL KEITA;YASSIN YUSEF TURSHANI;PAMELA ANNE MCCLIMANS;JOEY OLIVEROS OBORDO |
分类号 |
C08G18/72;C08G18/10;C08G18/38;G02B1/04 |
主分类号 |
C08G18/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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