Coating processes – Foraminous product produced
Patent
1975-10-01
1977-03-15
Hoffman, James R.
Coating processes
Foraminous product produced
427296, 427307, 427353, B05D 118, C25B 1308
Patent
active
040125416
ABSTRACT:
Hydrophobic diaphragm material, such as crystalline, highly expanded microporous polytetrafluoroethylene film, may be prepared for installation in a chlor-alkali cell by a process involving the steps of (1) immersing the diaphragm in a solution of acetal-type nonionic surfactant in a suitable non-aqueous solvent, (2) rinsing the diaphragm in deionized water, (3) immersing the diaphragm in an aqueous solution containing an amount of acetal-type nonionic surfactant effective to promote wetting for a suitable period of time, and (4) immersing the diaphragm in a brine solution containing about 100 to 200 grams per liter of sodium chloride and an amount effective to promote wetting of an acetal-type nonionic surfactant for a suitable period of time, such as several hours. In some instances, it is also advantageous to subject the diaphragm while immersed in the solvent solution to the action of a vacuum, to release trapped air.
REFERENCES:
patent: 2773114 (1956-12-01), McAuslan
patent: 3010536 (1961-11-01), Plurien et al.
patent: 3772072 (1973-11-01), Brown et al.
patent: 3772269 (1973-11-01), Lew
patent: 3904496 (1975-09-01), Harke et al.
patent: 3930979 (1976-01-01), Vallance
BASF Wyandotte Corporation
Dunn Robert E.
Hoffman James R.
Linkhauer John W.
Swick Bernhard R.
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