发明名称 |
POLYMERS FOR CONTACT LENSES |
摘要 |
The present invention relates to a thermoplastic polyurethane contact lens prepared from a mixture comprising: (a) at least one polyethylene glycol; (b) at least one di-isocyanate; and (c) at least one diol of formula (I): wherein n is an integer from 1 to 25; wherein the polyethylene glycol, di-isocyanate and diol are reacted under substantially anhydrous conditions. Further aspects of the invention relate to a process for preparing a contact lens. The invention also relates to a process for preparing a polyurethane xerogel in the form of a molded article, said process comprising the steps of: (i) preparing a reaction mixture comprising at least one polyethylene glycol, at least one di-isocyanate and at least one diol of formula I as described above; (ii) reacting the reaction mixture formed in step (i) under substantially anhydrous conditions to form a polyurethane xerogel; (iii) injection molding the polyurethane xerogel to form a molded article, (iv) hydrating the xerogel molded article to form a contact lens. |
申请公布号 |
HK1170515(A1) |
申请公布日期 |
2016.04.29 |
申请号 |
HK20120111183 |
申请日期 |
2012.11.06 |
申请人 |
OCUTEC LIMITED |
发明人 |
RASHID, ABDUL A;BOWERS, RODERICK, WILLIAM, JONATHAN RWJ;TIPTON, WADE W;GRAHAM, NEIL, BONNETTE NB |
分类号 |
C08G;G02B |
主分类号 |
C08G |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|