发明名称 |
PROCESS FOR THERMOFORMED ARTICLES |
摘要 |
<p>32889 CAN 8A A process for preparing shaped articles and shaped hydrogel articles including contact lenses comprises the steps of preparing a polymer or copolymer comprising units derived from an ethylenically-unsaturated monomer bearing at least one trihaloacetoxy-substituent group, thermoforming said polymer by heating in a mold or in sheet-form at a temperature in the range of 100 to 400.degree.C for about 5 seconds to 15 minutes, and then cooling said polymer, to provide a shaped article, optionally, solvolyzing the resulting shaped article to provide a hydroxy-substituted polymeric shaped article, and optionally hydrating said hydroxy-substituted polymeric shaped article to provide a shaped hydrogel article.</p> |
申请公布号 |
CA1241172(A) |
申请公布日期 |
1988.08.30 |
申请号 |
CA19840455034 |
申请日期 |
1984.05.24 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
HAMMAR, W. JAMES;OFSTEAD, RONALD F. |
分类号 |
B29C51/00;(IPC1-7):B29C51/00 |
主分类号 |
B29C51/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|