Patent ID: 7108787

Claim:
A method of preparing a hollow fiber membrane made from a synthetic hydrophobic polymer which holds a copolymer of 2-methacryloyloxyethyl phosphorylcholine and other vinyl-polymerizable monomers on the surface thereof, wherein said copolymer is present in the pores in the inner parts of the membrane only in a low amount and wherein the copolymer is unevenly distributed on the surface of the hollow fiber membrane comprising simultaneously discharging a hollow space inner solution from the inner side of double spinning nozzles and a synthetic polymer solution from the outer side of the double spinning nozzles and immersing the spun yarns into a coagulation bath located below the spinning nozzles, wherein a solution prepared by dissolving 0.001–10 wt % of a copolymer of 2 -methacryloyloxyethyl phosphorylcholine and other vinyl-polymerizable monomers is used as the hollow space inner solution.