Method of making a porous film

Details Method of making a porous film Method of making a porous film

1995-05-18

1997-01-14

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

B29C 5904

Patent

active

055936326

ABSTRACT:
A gas permeability control film having a barrier property against water, bacteria, and viruses, an oxygen gas permeation amount controlled to fall within the range of 10.sup.3 to 10.sup.7 cc/m.sup.2 .multidot.24 hours.multidot.25.degree. C., and a controlled carbon dioxide gas permeation amount. The gas permeability control film has an organic film in which non-through pores having an average opening width falling within the range of 0.5 .mu.m to 150 .mu.m are formed at a density of 500 to 200,000 pores/cm.sup.2.

REFERENCES:
patent: 3709774 (1973-01-01), Kimura et al.
patent: 3718059 (1973-02-01), Clayton
patent: 4250135 (1981-02-01), Orsini
patent: 4964992 (1990-10-01), Goldsmith et al.
patent: 4980100 (1990-12-01), Krishnakumar et al.
patent: 5114795 (1992-05-01), Percec et al.

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