Method of testing inert, displaceable diluents used in forming shaped hydrogel articles
US5736409A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | May 14, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Method of testing inert displaceable diluents used in forming shaped hydrogel articles such as soft contact lenses prepared by the steps of: PA1 (1) molding or casting a polymerization mixture including: PA2 (a) a monomer mixture having a major proportion of one or more hydrophilic monomers such as 2-hydroxyethyl methacrylate, and one or more cross-linking monomers; and PA2 (b) an inert, displaceable diluent chosen from: PA3 (i) ethoxylated alkyl glucoside; PA3 (ii) ethoxylated bisphenol A; PA3 (iii) polyethylene glycol; PA3 (iv) mixture of propoxylated and ethoxylated alkyl glucoside; PA3 (v) single phase mixture of ethoxylated or propoxylated alkyl gtucoside and C.sub.2-12 dihydric alcohol; PA3 (vi) adduct of .epsilon.-caprolactone and C.sub.2-6 alkanediols and triols; PA3 (vii) ethoxylated C.sub.3-6 alkanetriol; and PA3 (viii) mixtures of one or more of (i) through (vii), PA2 under conditions to polymerize the monomer mixture to produce a shaped gel of a copolymer of the monomers and the diluent; and PA1 (2) thereafter replacing the diluent with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.