Process for preparing macroporous open-cell carbon foam from nor

Details Process for preparing macroporous open-cell carbon foam from nor Process for preparing macroporous open-cell carbon foam from nor

1974-07-25

1976-06-01

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

131264, 131269, 252422, 260 25HA, 423445, 264 29, 423449, B01J 2118, B01J 3110

Patent

active

039607704

ABSTRACT:
Activated, macroporous open-cell carbon foam which is particularly useful as a filter for cigarette smoke and the like, is prepared by contacting, at a temperature of at least about 25.degree.C a normally crystalline vinylidene chloride polymer in substantially open-cell, macroporous foam form with liquid ammonia until at least about 50 percent of theoretical Cl.sup.- is removed, then heating said foam to a temperature sufficient to remove residual ammonium chloride.

REFERENCES:
patent: 2695427 (1954-11-01), Sarge et al.
patent: 2944031 (1960-07-01), Mason
patent: 3258363 (1966-06-01), Lieb
patent: 3342555 (1967-09-01), McMillan
patent: 3516791 (1970-06-01), Evans et al.
patent: 3852429 (1974-12-01), Murayama et al.
Kirk-Othmer - Encyclopedia of Chemical Technology - 2nd Edition vol. 21, 1970, pp. 294-295.
Tsuchida et al., Journal of Polymer Science - 1964 part A, vol. 2, pp. 3347-3354.
Translations of the Faraday Society - vol. 50, 1954, pp. 740-748; J. R. Dacey & D. G. Thomas.

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