| abstract |
PCT No. PCT/GB87/00237 Sec. 371 Date Dec. 3, 1987 Sec. 102(e) Date Dec. 3, 1987 PCT Filed Apr. 6, 1987 PCT Pub. No. WO87/06395 PCT Pub. Date Oct. 22, 1987.A composite membrane comprises a first material which defines a porous matrix and a second material blocking the pores of the matrix, the second material having been crosslinked by irradiation, preferably with UV radiation, when in the pores. Preferably a crosslinking agent is mixed with the second material. The porous matrix may be made by leaching a water soluble material from a blend of that material with polyethylene. The second material may be polymerizable, for example an acrylic acid derivative. |