| abstract |
Prepn. of a highly porous polymer membrane comprises: (i) dispersion of an insol. filler material into a soln. of at least two incompatible polymers which are in phase sepn. so that a homogenous soln. results, (b) application of (i) onto a carrier, performing a precipitative coagulation and (c) a solvent extn. of the membranes. Pref., the solvents are organic solvents such as alcohols, cyclic esters or ketones, the fillers are talcum, titanium dioxide, barium sulphate and the incompatible polymers are cellulose ester/polyvinyl ester and polyurethane/polyacrylate or acrylic copolymers. Also claimed is the membrane. USE/ADVANTAGE - (Claimed) The membranes are used as carrier matrices for testing strips such as for urine analysis. Compared to prior art, the new membranes are very absorbent and are uniformly wetted with the sample fluid. |