# US 2017/0280766 A1 · Hydrophobic tipping paper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0280766 A1 - Document ID: US20170280766A1 - Status: Published application - Kind: A1 - Application number: 15/511,687 - Filed: 2015-10-15 - Published: 2017-10-05 - Earliest claimed: 2014-10-20 - Assignees: Philip Morris Products S.A. - Applicants: Philip Morris Products S.A. - Inventors: Clément Besso; Aurélien Guyard; Alen Kadiric - Web page: https://patentgrep.com/patent/US20170280766A1 ## CPC - A24D 1/02: with special covers - D21H 19/10: Coatings without pigments (D21H19/66 takes precedence) - D21H 23/52: by contacting paper with a device carrying the material (D21H23/32, D21H23/46, D21H23/66 take precedence) - A24D 1/20: Cigarettes specially adapted for simulated smoking devices - A24D 1/22: Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources - 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 smoking article includes a tobacco substrate and a mouthpiece axially aligned in an abutting end to end relationship with the tobacco substrate. Hydrophobic tipping paper is disposed about the mouthpiece. The tipping paper is hydrophobic due to hydrophobic groups covalently bonded to the tipping paper. ## Claims ### Claim 1 A smoking article comprising: a tobacco substrate; a mouthpiece axially aligned in an abutting end to end relationship with the tobacco substrate; and tipping paper disposed about the mouthpiece, wherein the tipping paper is hydrophobic due to hydrophobic groups covalently bonded to the tipping paper. ### Claim 2 (depends on 1) A smoking article according to claim 1, wherein the tipping paper has a water contact angle of at least about 100 degrees. ### Claim 3 (depends on 1) A smoking article according to claim 1, wherein the tipping paper comprises cellulosic material and a hydrophobic group is covalently bonded to the cellulosic material. ### Claim 4 (depends on 1) A smoking article according to claim 1, wherein the tipping paper has a basis weight in a range from about 30 to about 90 grams per square meter and the hydrophobic group has a basis weight in a range from about 0.1 to about 3 grams per square meter. ### Claim 5 (depends on 1) A smoking article according to claim 1, wherein the hydrophobic group is covalently bonded to cellulosic material of the tipping paper by reacting in situ a fatty acid chloride with the cellulosic material. ### Claim 6 (depends on 1) A smoking article according to claim 1, wherein the hydrophobic tipping paper comprises fatty acid esters of cellulose. ### Claim 7 (depends on 5) A smoking article according to claim 5, wherein the fatty acid chloride is palmitoyl chloride, stearoyl chloride, behenoyl chloride, or a mixture of palmitoyl chloride and stearoyl chloride. ### Claim 8 (depends on 1) A smoking article according to claim 1, wherein the tipping paper exhibits a Cobb measurement value (60s) of less than 20 g/m2. ### Claim 9 (depends on 1) A smoking article according to claim 1, wherein the hydrophobic tipping paper is produced by a process comprising the steps of: applying a liquid composition comprising a fatty acid halide to at least one surface of a tipping paper, maintaining the surface at a temperature of about 120° C. to about 180° C., wherein the fatty acid halide reacts in situ with protogenic groups of material in the tipping paper resulting in the formation of fatty acid esters. ### Claim 10 (depends on 9) A smoking article according to claim 9, wherein the process comprises applying a liquid composition comprising stearoyl chloride or palmitoyl chloride to at least one surface of a tipping paper at a temperature of about 120° C. to about 180° C., wherein hydroxyl groups in the cellulosic material of the tipping paper reacts in situ with the stearoyl chloride or palmitoyl chloride. ### Claim 11 (depends on 9) A smoking article according to claim 9, wherein the process comprises applying the liquid composition to the at least one surface of a tipping paper at a rate of in a range from about 0.1 to about 3 grams per square meter to render the at least one surface of the tipping paper hydrophobic. ### Claim 12 (depends on 1) A method of forming a smoking article according to claim 1 comprising reacting a fatty acid chloride with cellulosic material of the tipping paper to form a hydrophobic tipping paper. ### Claim 13 A method for making hydrophobic tipping paper comprising the steps of: applying a liquid composition comprising a fatty acid halide to at least one surface of a tipping paper, maintaining the surface at a temperature of about 120° C. to about 180° C., wherein the fatty acid halide reacts in situ with protogenic groups of material in the tipping paper resulting in the formation of fatty acid esters. ### Claim 14 (depends on 13) The method according to claim 13 wherein the tipping paper comprising cellulosic material which comprises hydroxyl groups that react in situ with stearoyl chloride or palmitoyl chloride. ### Claim 15 (depends on 13) The method according to claim 13 wherein the applying step comprises printing the liquid composition comprising a fatty acid halide on at least one surface of a tipping paper at a rate in a range from about 0.1 to about 3 grams per square meter to render the at least one surface of a tipping paper hydrophobic. ### Claim 16 (depends on 12) The method according to claim 12 further comprising joining a tobacco substrate to a mouthpiece with the hydrophobic tipping paper. ### Claim 17 (depends on 1) A smoking article according to claim 1, wherein the tipping paper fixes the tobacco substrate to the mouthpiece. ### Claim 18 (depends on 3) A smoking article according to claim 3, wherein the hydrophobic group is a fatty acid ester. ### Claim 19 (depends on 1) A smoking article according to claim 1, wherein the hydrophobic tipping paper defines a uniform or non-uniform pattern of discrete hydrophobic areas on the tipping paper. ### Claim 20 (depends on 12) The method according to claim 12 wherein the reacting step comprises printing the fatty acid chloride onto the tipping paper to form a hydrophobic tipping paper.