# US 9,775,378 B2 · Cigarette paper comprising flaky filler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,775,378 B2 - Document ID: US9775378B2 - Status: Granted - Kind: B2 - Application number: 14/552,714 - Filed: 2014-11-25 - Published: 2015-04-02 - Granted: 2017-10-03 - Earliest claimed: 2012-06-01 - Assignees: delfortgroup AG - Applicants: Delfortgroup AG - Inventors: Dieter Möhring; Roland Zitturi; Dietmar Volgger - Web page: https://patentgrep.com/patent/US9775378B2 ## CPC - A24D 1/02: with special covers - A24D 1/025: {the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity} - A24D 1/027: {with ventilating means, e.g. perforations} - D21H 15/02: characterised by configuration - D21H 17/675: {Oxides, hydroxides or carbonates} - D21H 21/52: Additives of definite length or shape - D21H 27/00: Special paper not otherwise provided for, e.g. made by multi-step processes - A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR ## Abstract A cigarette paper contains pulp fibers and filler particles, whereby at least 20% of the filler particles, by mass or by particle number, have a flaked shape. The flaked filler particles have a length l, a width b and a thickness d, which correspond to the respective maximum extension in three mutually orthogonal spatial directions, whereby the length l as well as the width b are at least twice as large as the thickness d. The mass-specific median value d50 of the particle size distribution measured according to ISO 13317-3 is between 0.2 μm and 4.0 μm, and the flaked particles are formed by calcium carbonate. ## Claims ### Claim 1 Cigarette paper, which contains pulp fibers and filler particles, whereby at least 20% of the filler particles, by mass or by particle number, have a flaked shape, wherein the flaked filler particles have a length l, a width b and a thickness d, which correspond to the respective maximum extension in three mutually orthogonal spatial directions, whereby the length l as well as the width b are at least twice as large as the thickness d, wherein the mass-specific median value d50 of the particle size distribution measured according to ISO 13317-3 is between 0.2 μm and 4.0 μm, and wherein the flaked particles are formed by calcium carbonate; and wherein the cigarette paper has an air permeability of x CORESTA Units and a diffusion capacity Dx* for CO2, and whereby Dx*·√{square root over (50)}/√{square root over (x)}≧1.80 cm/s holds. ### Claim 2 (depends on 1) Cigarette paper according to claim 1, wherein Dx*·√{square root over (50)}/√{square root over (x)}≧1.85 cm/s holds. ### Claim 3 (depends on 1) Cigarette paper according to claim 1, wherein Dx*·√{square root over (50)}/√{square root over (x)}≧1.90 cm/s holds. ### Claim 4 (depends on 1) Cigarette paper according to claim 1, whereby 20≦×≦120 holds. ### Claim 5 (depends on 1) Cigarette paper according to claim 1, wherein preferably 30≦×≦100 holds. ### Claim 6 (depends on 1) Cigarette paper according to claim 1, wherein the mass-specific median value d50 of the particle size distribution measured according to ISO 13317-3 is between 0.5 μm and 3.0 μm. ### Claim 7 (depends on 1) Cigarette paper according to claim 1, whereby the calcium carbonate comprises a calcite, a vaterite or a mixture thereof. ### Claim 8 (depends on 7) Cigarette paper according to claim 7, whereby the mixture consists of 50% by weight to 70% by weight calcite and 30% by weight to 50% by weight vaterite. ### Claim 9 (depends on 1) Cigarette paper according to claim 1, wherein the entire filler content of the paper is between 10% by weight and 45% by weight. ### Claim 10 (depends on 1) Cigarette paper according to claim 1, wherein the entire filler content of the paper is between 20% by weight and 35% by weight. ### Claim 11 (depends on 1) Cigarette paper according to claim 1, wherein the basis weight is between 10 g/m2 and 60 g/m22. ### Claim 12 (depends on 1) Cigarette paper according to claim 1, wherein the basis weight is between 20 g/m2 and 35 g/m2. ### Claim 13 (depends on 1) Cigarette paper according to claim 1, wherein the paper is treated in areas with burn-retardant substances, which are suitable for providing a cigarette manufactured from the paper with self-extinguishing properties. ### Claim 14 (depends on 1) Cigarette paper of claim 1, wherein at least 40% of the filler particles, by mass or by particle number, have a flaked shape. ### Claim 15 (depends on 1) Cigarette paper of claim 1, wherein at least 55% of the filler particles, by mass or by particle number, have a flaked shape. ### Claim 16 (depends on 1) Cigarette paper of claim 1, wherein at least 70% of the filler particles, by mass or by particle number, have a flaked shape. ### Claim 17 A cigarette, comprising a tobacco rod and a cigarette paper wrapping the tobacco rod, whereby the cigarette paper is a cigarette paper, which contains pulp fibers and filler particles , whereby at least 20% of the filler particles, by mass or by particle number, have a flaked shape, wherein the flaked filler particles have a length l, a width b and a thickness d, which correspond to the respective maximum extension in three mutually orthogonal spatial directions, whereby the length l as well as the width b are at least twice as large as the thickness d, wherein the mass-specific median value d50 of the particle size distribution measured according to ISO 13317-3 is between 0.2 μm and 4.0 μm, and wherein the flaked particles are formed by calcium carbonate; and wherein the cigarette paper has an air permeability of x CORESTA Units and a diffusion capacity Dx* for CO2, and whereby Dx*·√{square root over (50)}/√{square root over (x)}≧1.80 cm/s holds.