Patent ID: 7560024

Claim:
A method of controlling pore size in a continuous process for manufacturing porous membranes, comprising, providing two or more polymer solutions wherein the two or more polymer solutions are formed of the same polymer solution, at least two of the two or more solutions have different pre-established Tmax profiles such that a first solution has a low TMax and at least a second solution has a Tmax greater than the first solution, determining the pore size of the membrane that will result under said process for each polymer solution, determining the ratio or proportions of each solution to be blended together to make a homogeneous manufacturing process polymer solution, blending said two or more polymer solutions in the ratio or proportions calculated to obtain a blend of polymer solutions in a manner that affects the final solution properties only by the effect of the ratio or proportions of the two or more polymer solutions and manufacturing membranes with said blend by said continuous process.