Process for producing cigarette filters

Details Process for producing cigarette filters Process for producing cigarette filters

1975-04-09

1977-10-18

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

131 10R, 131269, 260 25E, 264 455, 264 53, 264151, 264210R, 264DIG5, 264DIG13, 264DIG14, 264DIG16, 264DIG17, B29D 2700

Patent

active

040545504

ABSTRACT:
An improved process is provided for producing cigarette filters comprised of a substantially open-cell foamed thermoplastic polypropylene resin wherein a mixture comprising a thermoplastic polypropylene resin, a volatile blowing agent and a nucleating agent is extruded through a die to produce a strand of foamed resin with the strand then being cut into individual filter elements. The improvement comprises employing as a primary nucleating agent from 0.1 to 40 percent by weight, based on the weight of the resin, of a particulate compound of a metal selected from Groups IIA, IIIA or IVA of the Mendeleef periodic table of elements together with from 0.01 to 5.0 percent by weight, based on the weight of the primary nucleating agent, of a synergist consisting of an organic compound having a hydrophobic group and a hydrophilic group. A particularly effective combination is the use of calcium carbonate as the primary nucleating agent and potassium benzoate as the synergist compound.

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