Method of making hydrogel laminates

Abstract

Abstract A COMPARATIVELY THICH SHEET OF A SPONGY HYDROGEL, MADE E.G. BY POLYMERIZING ETHYLENE GLYCOL MONOMETHACRYLATE IN PRESENCE OF LESS THAN 2 PERCENT OF A CROSS-LINKING AGENT AND MORE THAN 60 PERCENT OF WATER, IS LAMINATED WITH A MUCH THINNER SHEET OF THE SAME OR SIMILAR, BUT HOMOGENEOUS HYDROGEL, EITHER FROM ONE SIDE OR FROM BOTH SIDES. ALTERNATIVELY, ONE EXTERNAL LAYER MAY BE LESS HYDROPHILIC OR FULLY HYDROPHILIC. THE LAMINATION IS CARRIED OUT SO THAT THE EXTERNAL THIN LAYER IS MADE ON A GLASS OR OTHER SMOOTH PAD, EITHER BY POLYMERIZING A CROSS-LINKED OR LINEAR POLYMER THEREON, OR BY CASTING A THIN LAYER OF A DISSOLVED LINEAR POLYMEER. THEN A MONOMER MIXTURE FOR SPONGY HYDROGEL IS CASTT ONTO THE FIRST LAYER AND POLYMERIZED. A SANDWICH STRUCTURE IS OBTAINED IF THE MONOMER MIXTURE FOR SPONGY HYDROGEL IS CAST BETWEEN TWO PADS PROVIDED WITH A THIN HOMOGENEOUS POLYMER LAYER. HYDROGEL LAMINATES AND SANDWICH STRUCTURES ARE USEFUL E.G. FOR SURGICAL AND COSMETIC PURPOSES, FOR FILTERING LIQUIDS ETC.

Inventors

• 👤 O Wichterle
• 👤 K Kliment

Bibliographic Details