Aerosol generating article with non-combustible coating

Patent metadata

Field	Value
Publication number	US-12041963-B2
Application number	US-202017768652-A
Country	US
Kind code	B2
Filing date	Oct 13, 2020
Priority date	Oct 14, 2019
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

There is provided an aerosol generating article (2) comprising a combustible heat source (4) having an upstream portion and a downstream portion. The aerosol generating article further comprises an aerosol-forming substrate (10) downstream of the heat source (4) and a wrapper (36) circumscribing an upstream portion of the aerosol-forming substrate (10) and the downstream portion of the combustible heat source (4). The aerosol generating article (2) further comprises a non-combustible coating (42) provided on the upstream portion of the combustible heat source (4) and not on the downstream portion of the combustible heat source (4), the non-combustible coating having a thickness of between about 30 micrometres and about 250 micrometres.

First claim

The invention claimed is:

1. An aerosol generating article comprising;
a combustible heat source having an upstream portion and a downstream portion,
an aerosol-forming substrate downstream of the heat source,
a wrapper circumscribing an upstream portion of the aerosol-forming substrate and the downstream portion of the combustible heat source, and
a non-combustible coating provided on the longitudinal outer surface of the upstream portion of the combustible heat source and not on the downstream portion of the combustible heat source, the non-combustible coating having a thickness of between about 30 micrometres and about 250 micrometres.

2. The aerosol generating article according to claim 1 , wherein the combustible heat source comprises at least one ignition aid.

3. The aerosol generating article according to claim 2 , wherein the at least one ignition aid comprises calcium peroxide.

4. The aerosol generating article according to claim 1 , wherein the non-combustible coating is not provided on the front end face of the combustible heat source.

5. The aerosol generating article according to claim 1 , wherein the non-combustible coating has a thickness of between about 50 micrometres and about 150 micrometres.

6. The aerosol generating article according to claim 1 , wherein the non-combustible coating comprises ceramic particles.

7. The aerosol generating article according to claim 6 , wherein the ceramic particles have a mean particle size of between about 0.04 micrometres and about 150 micrometres.

8. The aerosol generating article according to claim 6 or claim 7 , wherein the ceramic particles comprise at least one of diatomaceous earth, expanded clay, vermiculite, pearlite, foam glass, kaolinite, and zirconia.

9. The aerosol generating article according to claim 1 , wherein the non-combustible coating comprises at least one rheology modifier.

10. The aerosol generating article according to claim 9 , wherein the rheology modifier comprises at least one of cellulose, cellulose derivatives, polyvinyl alcohol, polyethylene imine, polyethylene oxide, polyethylene glycol, xanthan gum, bentonite, microsilica, calcium carbonate, sodium silicate, and potassium silicates.

11. The aerosol generating article according to claim 1 , wherein the non-combustible coating comprises diatomaceous earth, sodium silicate, and kaolinite.

12. The aerosol generating article according to claim 11 , wherein the non-combustible coating comprises between about 50 weight percent and 70 weight percent diatomaceous earth, between about 20 weight percent and about 30 weight percent kaolinite, and between about 10 weight percent and about 20 weight percent sodium silicate.

13. The aerosol generating article according to claim 1 , wherein the wrapper is a heat-conducting, combustion-resistant wrapper.

14. The aerosol generating article according to claim 1 , herein the wrapper has a thickness of between about 30 micrometres and about 250 micrometres.

15. The aerosol generating article according to claim 1 , wherein the non-combustible coating contains pores.

Assignees

• Philip Morris Products Sa

Inventors

• Duc Fabien
• Gonzenbach Urs
• Pijnenburg Johannes Petrus Maria
• Spadaro Chiara
• Sturzenegger Philip

Classifications

• C09D5/18

  Fireproof paints {including high temperature resistant paints} · CPC title

• C09D1/04

  with organic additives · CPC title

• A24D1/025

  the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity · CPC title

• A24B15/165

  comprising as heat source a carbon fuel or an oxidized or thermally degraded carbonaceous fuel, e.g. carbohydrates, cellulosic material · CPC title

• C09D7/68

  Particle size between 100-1000 nm · CPC title