# US 12,178,235 B2 · Multi-segment component with intumescent coating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,178,235 B2 - Document ID: US12178235B2 - Status: Granted - Kind: B2 - Application number: 17/055,796 - Filed: 2019-05-16 - Published: 2021-05-06 - Granted: 2024-12-31 - Earliest claimed: 2018-05-17 - Assignees: Philip Morris Products S.A. - Applicants: Philip Morris Products S.A. - Inventors: Samuel Bonnely; Anna Canal Ponsico; Fabien Duc; Giuseppe Gaudio; Simon Nussbaumer; Lucien Suarez - Web page: https://patentgrep.com/patent/US12178235B2 ## CPC - A24B 15/165: {comprising as heat source a carbon fuel or an oxidized or thermally degraded carbonaceous fuel, e.g. carbohydrates, cellulosic material} - A24D 1/02: with special covers - A24D 1/042: {with mouthpieces (A24D1/047 takes precedence)} - A24D 1/22: Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources - A24B: MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF - A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES ## Abstract A multi-segment component for an aerosol-generating article is provided, the multi-segment component including: a combustible heat source; an aerosol-forming substrate downstream of the combustible heat source; and a wrapper circumscribing a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, a front portion of the combustible heat source extending beyond the wrapper so that the front portion of the combustible heat source is exposed during use; and an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source. ## Claims ### Claim 1 A multi-segment component for an aerosol-generating article, the multi-segment component comprising: a combustible heat source; an aerosol-forming substrate downstream of the combustible heat source; and a wrapper circumscribing a rear portion of the combustible heat source and at least a front portion of the aerosol-forming substrate, wherein a front portion of the combustible heat source extends beyond the wrapper so that the front portion of the combustible heat source is exposed during use; and an intumescent coating on all or part of the front portion of the combustible heat source, the intumescent coating being configured to form a heat insulating layer on the front portion of the combustible heat source in response to heating by the combustible heat source. ### Claim 2 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating is provided on substantially an entire outer surface of the front portion of the combustible heat source. ### Claim 3 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating is provided in a discontinuous pattern on the front portion of the combustible heat source. ### Claim 4 (depends on 3) The multi-segment component according to claim 3, wherein the discontinuous pattern comprises one or more lines, rings, dots, or other discrete geometric shapes of intumescent material, or any combination thereof. ### Claim 5 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating is provided only on the front portion of the combustible heat source. ### Claim 6 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating is provided on substantially an entire length of the combustible heat source. ### Claim 7 (depends on 6) The multi-segment component according to claim 6, wherein the intumescent coating comprises a first intumescent coating on the front portion of the combustible heat source, and a second intumescent coating on the rear portion of the combustible heat source, and wherein the first and the second intumescent coatings are formed from different intumescent materials. ### Claim 8 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating has an expansion ratio of at least about 1.5:1, when heated from 20 degrees Celsius to 700 degrees Celsius at 1 atmosphere of pressure. ### Claim 9 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating has an expansion ratio of from about 1.5:1 to about 8:1, when heated from 20 degrees Celsius to 700 degrees Celsius at 1 atmosphere of pressure. ### Claim 10 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating has a thickness of from about 100 micrometres to about 2 millimetres. ### Claim 11 (depends on 1) The multi-segment component according to claim 1, wherein the intumescent coating has a thickness of from about 200 micrometres to about 1 millimetre. ### Claim 12 (depends on 1) The multi-segment component according to claim 1, wherein the heat insulating layer formed by the intumescent coating is porous. ### Claim 13 (depends on 1) The multi-segment component according to claim 1, wherein the front portion of the combustible heat source has a length of at least 25 percent of a total length of the combustible heat source. ### Claim 14 (depends on 1) The multi-segment component according to claim 1, wherein the wrapper comprises one or more layers of heat-conductive material. ### Claim 15 (depends on 14) An aerosol-generating article comprising a multi-segment component according to claim 14, and a mouthpiece disposed downstream of the multi-segment component.