| 发明名称 |
Method for making contact lenses |
| 摘要 |
The instant invention pertains to a method and a fluid composition for producing contact lenses with improved lens quality and with increased product yield. The method of the invention involves adding a Butylated Polyvinylpyrrolidone into a fluid composition including a lens-forming material in an amount sufficient to reduce an averaged mold separation force by at least about 20% in comparison with that without the Butylated Polyvinylpyrrolidone. |
| 申请公布号 |
US9623614(B2) |
申请公布日期 |
2017.04.18 |
| 申请号 |
US201113291503 |
申请日期 |
2011.11.08 |
| 申请人 |
Novartis AG |
发明人 |
Holland Troy Vernon;Smith Dawn Alison |
| 分类号 |
B29D11/00;C08L39/00;C08L39/04;G02B1/04 |
主分类号 |
B29D11/00 |
| 代理机构 |
|
代理人 |
Hu Sheng-Hsin |
| 主权项 |
1. A method for producing a contact lens, comprising: the steps of: introducing a fluid composition into a mold for making a contact lens, wherein the fluid composition comprises a lens-forming material and a Butylated Polyvinylpyrrolidone, wherein the lens-forming material is a water-soluble crosslinkable poly(vinyl alcohol) prepolymer which is crosslinkable and/or polymerizable by actinic radiation or by heating;
crosslinking/polymerizing the lens-forming material in the mold to form a lens having a polymer matrix; and separating the mold, wherein the Butylated Polyvinylpyrrolidone present in an amount sufficient to reduce an averaged mold separation force by at least about 20% in comparison with that without the Butylated Polyvinylpyrrolidone; wherein the Butylated Polyvinylpyrrolidone having a molecular weight of about 12,000 Da to 22,000 Da. |
| 地址 |
Basel CH |
