Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
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.
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Baxter Samuel
Cuangani Pushpkumar D.
Foelak Morton
Monsanto Chemicals Limited
Stanley Howard C.
Weinkauf Russell E.
Williams, Jr. James W.
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