Method of forming shaped hydrogel articles including contact lenses using inert, displaceable diluents
US5490959A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1995 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | May 31, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Shaped hydrogel articles such as soft contact lenses are prepared by the steps of: PA0 (1) molding or casting a polymerization mixture comprising: PA1 (a) a monomer mixture comprising a major proportion of one or more hydrophilic monomers such as 2-hydroxyethyl methacrylate, and one or more cross-linking monomers; and PA1 (b) an inert, displaceable diluent selected from the group consisting of: PA2 (i) ethoxylated alkyl glucoside; PA2 (ii) ethoxylated bisphenol A; PA2 (iii) polyethylene glycol; PA2 (iv) mixture of propoxylated and ethoxylated alkyl glucoside; PA2 (v) single phase mixture of ethoxylated or propoxylated alkyl glucoside and C.sub.2-12 dihydric alcohol; PA2 (vi) adduct of .epsilon.-caprolactone and C.sub.2-6 alkanediols and triols; PA2 (vii) ethoxylated C.sub.3-6 alkanetriol; and PA2 (viii) mixtures of one or more of (i) through (vii), under conditions to polymerize said monomer mixture to produce a shaped gel of a copolymer of said monomers and said diluent; and PA0 (2) thereafter replacing said diluent with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.