RU-2861661-C2 - IMPROVED AEROSOL-GENERATING SUBSTRATE

Abstract

FIELD: aerosols. SUBSTANCE: invention relates to an aerosol-generating substrate. The substrate comprises on a dry weight basis: from 10 to 90 mas.% thermally conductive particles, wherein each thermally conductive particle of the thermally conductive particles has a thermal conductivity of at least 1 W/(m·K) in at least one direction at 25 degrees Celsius; from 7 to 60 mas.% aerosol-forming material; from 2 to 20 mas.% fibres; and from 2 to 10 mas.% binder. The aerosol-generating substrate has a thermal conductivity of at least 0.22 W/(m·K) in at least one direction at 25 degrees Celsius. Also claimed are an aerosol-generating article comprising the aerosol-generating substrate, and a method of forming an aerosol-generating substrate. EFFECT: improved aerosol-generating substrate having increased thermal conductivity. 14 cl, 5 dwg

Inventors

• FEDELI, Francesco
• HUANG, Houxue
• WAIRIMU, Esther

Dates

Publication Date

20260507

Application Date

20220707

Priority Date

20210707

Claims (20)

1. 1. An aerosol-forming substrate containing, on a dry weight basis:
2. from 10 to 90% by weight of thermally conductive particles, wherein each thermally conductive particle of the thermally conductive particles has a thermal conductivity of at least 1 W/(m⋅K) in at least one direction at 25 degrees Celsius;
3. from 7 to 60% by weight of a substance for forming an aerosol;
4. from 2 to 20% by weight of fibers;
5. from 2 to 10% by weight of binder; and
6. less than 5% by weight of tobacco,
7. in this case, the substrate that forms the aerosol has
8. thermal conductivity of at least 0.22 W/(m⋅K) in at least one direction at 25 degrees Celsius.
9. 2. An aerosol-forming substrate according to claim 1, wherein the heat-conducting particles have a particle size distribution with a particle size by volume D10 of 1 to 20 microns.
10. 3. An aerosol-forming substrate according to claim 1 or 2, wherein the heat-conducting particles have a particle size distribution with a particle size by volume D90 of 50 to 300 microns.
11. 4. An aerosol-forming substrate according to any one of the preceding claims, wherein the heat-conducting particles have a particle size distribution with a particle size by volume of D10 and a particle size by number of D90, wherein the particle size by volume of D90 is no more than 50 times the particle size by number of D10.
12. 5. An aerosol-forming substrate according to any one of the preceding claims, wherein the heat-conducting particles are spherical.
13. 6. An aerosol-forming substrate according to any one of the preceding claims, wherein the heat-conducting particles comprise or consist of a current-receiving material.
14. 7. An aerosol-forming substrate according to any one of the preceding claims, wherein the substrate comprises, on a dry weight basis, at least 40% by weight of heat-conducting particles.
15. 8. An aerosol-forming substrate according to any one of the preceding claims, wherein the substrate contains, on a dry weight basis, from 65 to 85% by weight of heat-conducting particles.
16. 9. An aerosol-forming substrate according to any one of the preceding claims, wherein the heat-conducting particles are uniformly distributed throughout the aerosol-forming substrate.
17. 10. An aerosol-forming substrate according to any one of the preceding claims, wherein the aerosol-forming substrate comprises from 1 to 20% by weight of water.
18. 11. A combined aerosol-forming substrate containing:
19. a first material and a second material, wherein the first material is contained in the combined aerosol-forming substrate as a first plurality of individual elements, and the second material is contained in the combined aerosol-forming substrate as a second plurality of individual elements,
20. wherein the first material contains a substance for forming an aerosol and has a first thermal conductivity, and

Description

The present invention relates to an aerosol-generating substrate. The present invention also relates to a method for producing an aerosol-generating substrate, an aerosol-generating article, and an aerosol-generating system. A typical aerosol-generating system comprises an aerosol-generating device and an aerosol-generating article containing an aerosol-forming substrate. During use, the aerosol-generating device interacts with the aerosol-generating article to heat the aerosol-forming substrate, causing the aerosol-forming substrate to release volatile compounds. These compounds then cool, forming an aerosol that is inhaled by the user. Known aerosol-generating substrates typically have relatively low thermal conductivity values. This can be undesirable, particularly in aerosol-generating systems in which a plate is inserted into the aerosol-generating substrate and heated to warm the aerosol-generating substrate. This is because the low thermal conductivity of the aerosol-generating substrate can lead to a relatively large temperature gradient across the aerosol-generating substrate during use. This can mean that the parts of the aerosol-generating substrate located farthest from the plate do not reach high temperatures and, therefore, do not release as many volatile compounds as they would if the aerosol-generating substrate had a high thermal conductivity. In other words, the low thermal conductivity of the aerosol-generating substrate can, undesirably, lead to inefficient use of the aerosol-generating substrate. Furthermore, known aerosol-forming substrates typically cannot be heated to operating temperatures by induction. This means that induction heating typically requires a susceptor element. This can increase costs. It can also lead to the same problems discussed above. For example, when an inductively heated susceptor element is positioned centrally within the substrate, the portions of the aerosol-forming substrate located furthest from the susceptor element may not reach high temperatures and, therefore, may not release as many volatile compounds. Attempts have been made to increase the thermal conductivity of aerosol-forming substrates. However, to date, these efforts have been ineffective in one or more respects. An object of the present invention is to provide an improved aerosol-forming substrate, such as an aerosol-forming substrate having increased thermal conductivity. According to the present invention, an aerosol-forming substrate is provided. The aerosol-forming substrate may comprise, on a dry weight basis, from 10 to 90 weight percent [wt.%] of thermally conductive particles. Each thermally conductive particle of the thermally conductive particles may have a thermal conductivity of at least 1 watt per meter Kelvin [W/(m⋅K)] in at least one direction at 25 degrees Celsius. The aerosol-forming substrate may comprise, on a dry weight basis, from 7 to 60 weight percent of an aerosol former. The aerosol-forming substrate may comprise, on a dry weight basis, from 2 to 20 weight percent of fibers. The aerosol-forming substrate may comprise, on a dry weight basis, from 2 to 10 weight percent of a binder. The aerosol-forming substrate may have a thermal conductivity of at least 0.22 W/(m⋅K) in at least one direction at 25 degrees Celsius. Thus, according to a first aspect of the present invention, there is provided an aerosol-forming substrate comprising, on a dry weight basis: from 10 to 90% by weight of thermally conductive particles, wherein each thermally conductive particle of the thermally conductive particles has a thermal conductivity of at least 1 W/(m⋅K) in at least one direction at 25 degrees Celsius; from 7 to 60 wt.% aerosol forming agent; from 2 to 20 wt.% fibers; and from 2 to 10 wt.% binder, wherein the aerosol forming substrate has a thermal conductivity of at least 0.22 W/(m⋅K) in at least one direction at 25 degrees Celsius. Advantageously, thermally conductive particles can increase the thermal conductivity of the aerosol-forming substrate. Increased thermal conductivity of the substrate can ensure a more uniform temperature distribution throughout the substrate during use. This can result in a larger proportion of the aerosol-forming substrate reaching a temperature high enough to release volatile compounds, thereby increasing the efficiency of the aerosol-forming substrate. Furthermore, increased thermal conductivity of the substrate can allow a heater, such as a heating plate configured to heat the substrate, to operate at a lower temperature and thus require less energy. Furthermore, increased thermal conductivity of the substrate can allow the heater to heat the substrate to a temperature at which volatile compounds are released in a shorter time. Thus, increased thermal conductivity can reduce the time required to generate an inhalable aerosol for the user. Preferably, one or both of the fibers and the binder can increase the tensile strength of the aerosol-forming s