Method for modifying the pore size distribution of a microporous

Details Method for modifying the pore size distribution of a microporous Method for modifying the pore size distribution of a microporous

1978-11-15

1980-12-16

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

2105002, 264 41, 264129, 264340, 264DIG13, 264DIG18, 264321, B29D 2700

Patent

active

042397146

ABSTRACT:
The pore size distribution of a microporous separation medium, such as a membrane or gel, is modified so as to provide it with a sharp upper cut-off of preselected molecular size. The modification is effected by first filling the pores of the separation medium with a volatile liquid, and then evaporating a controlled amount of the volatile liquid to form voids at the entrances to the pores. A concentrated solution of a cross-linkable or polymerizable pore-blocking agent, such as a protein, enzyme or polymeric material, is then applied to the surface of the separation medium. The pore-blocking agent is a material which is insoluble in the volatile liquid and whose molecular size distribution has a lower limit corresponding to the preselected molecular size, whereby the pore-blocking agent selectively enters only those pores larger than the preselected size and remains in the voids at the entrances to the pores. After removing excess pore-blocking agent solution from the surface of the separation medium, the pore-blocking agent is insolublized by cross-linking or polymerization so as to immobilize it within the voids and thereby obstruct the entrances to all of the pores larger than the preselected size.

REFERENCES:
patent: 3519708 (1970-07-01), McMichael
patent: 3637415 (1972-01-01), Civardi
patent: 3709774 (1973-01-01), Kimura
patent: 3718532 (1973-02-01), Hayes
patent: 3755517 (1973-08-01), Clancy et al.
patent: 3837900 (1974-09-01), Englert et al.
patent: 3852388 (1974-12-01), Kimura
patent: 3873665 (1975-03-01), Segovia
patent: 4082704 (1978-04-01), Rudner et al.

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