Patent ID: 6303385
Filing Date: 2001-10-16
Classification: C08F,G01N,Y10T

Abstract:
An optical sensor for an ionic strength-independent pH value determination, consisting ofA) a transparent support materialB) a layer of water-insoluble copolymers that are composed ofa) from 39.9 to 60% by weight of N,N-dimethylacrylamide or N,N-dimethylmethacrylamide;b) from 60 to 39.9% by weight of a monomer of formula Ia or Ib ##STR13##wherein R.sub.a is hydrogen or C.sub.1 -C.sub.6 alkyl and R.sub.b is C.sub.1 -C.sub.12 alkyl; with the proviso that R.sub.a and Rb are not both methyl;c) from 0.1 to 0.7% by weight of a proton-sensitive fluorophore which is covalently bonded to the polymer; andd) from 0 to 20% by weight of a diolefinic crosslinking component,the sum of the percentage weights of a) to d) being 100%.