| abstract |
Silicone-free hydrogel, preparable by radical copolymerization of a mixture of at least one radically polymerizable monomer selected from the group consisting of a) acrylates, b) diacrylates, c) acrylamides, d) vinyl compounds, e) mixtures thereof. such as at least one free-radically polymerizable cellulose derivative of the following general formula I, in which each of R 1 , R 2 and R 3 is independently selected from the group consisting of hydrogen; linear or branched C 1 -C 8 -alkyl radicals; aliphatic, cycloaliphatic, araliphatic or aromatic carboxylic acid residues having 2 to 36 carbon atoms and / or polyoxyalkylene radicals whose terminal OH group may be esterified with aliphatic, cycloaliphatic, araliphatic or aromatic carboxylic acid esters having 2 to 36 carbon atoms, wherein n is 10 to 100,000, wherein at least one radical R 1 , R 2 and / or R 3 is selected from the group consisting of a grouping according to the general formula II in which R 4 is independently selected from the group consisting of hydrogen or linear or branched C 1 -C 8 -alkyl radicals and m 1 to 18, x 0 to 1000, y 0 or 1, as well z is 0 to 18, characterized in that the at least one free-radically polymerizable cellulose derivative of hydroxypropylmethylcellulose phthalate (HPMCP, CAS No. 9050-31-1) is derived, wherein at least one OH group of the HPMCP is etherified and / or esterified with the radical of the formula II. |