Filter elements

Details Filter elements Filter elements

1975-12-22

1980-11-04

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 455, 264 461, 264 53, 264DIG13, 521 79, 521 98, C08J 900, C08J 914

Patent

active

042321301

ABSTRACT:
A polyolefin filter for tobacco products and the like was prepared. The extruded element is an open-cell foamed polyethylene or polypropylene having a TPM filtration efficiency greater than 20%. The filter rod can be made by extruding polyethylene containing less than 0.2 moles of a volatile blowing agent per 100 grams of resin at a melt temperature between 130.degree. C. and 150.degree. C., the temperature of the die being between 120.degree. C. and 136.degree. C. Higher melt temperature and die temperature are required for polypropylenes.

REFERENCES:
patent: 3558764 (1971-01-01), Isaacson et al.
patent: 3677881 (1972-07-01), Riordon
patent: 3679538 (1972-07-01), Druin
patent: 3785919 (1974-01-01), Hickman
patent: 3836423 (1974-09-01), Wagner et al.
patent: 3839516 (1974-10-01), Williams et al.
patent: 3871897 (1975-03-01), Ealding
patent: 3912800 (1975-10-01), Edlin
patent: 3939237 (1976-02-01), Naito et al.
patent: 3950278 (1976-04-01), Wada et al.

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