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Thermoplastic cigarette wrapper

  • US 4,020,850 A
  • Filed: 07/17/1975
  • Issued: 05/03/1977
  • Est. Priority Date: 12/12/1973
  • Status: Expired due to Term
First Claim
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1. A thin, microporous cigarette wrapper sheet having a porosity of between about 5-60 Greiner and in which at least 50 percent of the pores of said sheet have a diameter of no more than 3 microns, said sheet comprising:

  • (a) about 10 percent to about 45 percent by weight finely divided unfilled paper having a size of 140 mesh or less;

    (b) about 1.5 percent to about 2.8 percent by weight potassium nitrate;

    (c) up to about 40 percent by weight of a whitener; and

    (d) about 20 percent to about 55 percent by weight of a thermoplastic binder selected from the group consisting of cellulose esters, cellulose ethers, and mixtures thereof.

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