Combustible heat source comprising an ignition aid and a binding agent

Abstract

A combustible heat source for an aerosol-generating article, the combustible heat source comprising: carbon; an alkaline earth metal peroxide ignition aid; and a binding agent comprising a combination of carboxymethyl cellulose and at least one additional cellulose ether. Preferably, the at least one additional cellulose ether is selected from the group consisting of ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methylcellulose.

1 . A combustible heat source for an aerosol-generating article, the combustible heat source comprising:
 carbon;   an alkaline earth metal peroxide ignition aid; and   a binding agent comprising a combination of carboxymethyl cellulose and at least one additional cellulose ether.   
     
     
         2 . The combustible heat source according to  claim 1  wherein the at least one additional cellulose ether is selected from the group consisting of ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methylcellulose. 
     
     
         3 . The combustible heat source according to  claim 1  wherein the ratio of the percentage by weight of carboxymethyl cellulose to the percentage by weight of the at least one additional cellulose ether in the combustible heat source is at least about 1:1. 
     
     
         4 . The combustible heat source according to  claim 1  wherein the alkaline earth metal peroxide ignition aid is calcium peroxide. 
     
     
         5 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises at least about 15 percent by weight of the alkaline earth metal peroxide ignition aid. 
     
     
         6 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises between about 20 percent by weight and about 60 percent by weight of the alkaline earth metal peroxide ignition aid. 
     
     
         7 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises at least about 3 percent by weight of the binding agent. 
     
     
         8 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises between about 4 percent by weight and about 15 percent by weight of the binding agent. 
     
     
         9 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises at least about 0.2 percent by weight of the at least one additional cellulose ether. 
     
     
         10 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises between about 0.75 percent by dry weight and about 5 percent by weight of the at least one additional cellulose ether. 
     
     
         11 . The combustible heat source according to  claim 1  wherein the carboxymethyl cellulose is present in the combustible heat source in an amount of at least about 1.5 percent by dry weight. 
     
     
         12 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises at least about 25 percent by weight of carbon. 
     
     
         13 . The combustible heat source according to  claim 1  wherein the combustible heat source comprises between about 30 percent by weight and about 55 percent by weight of carbon. 
     
     
         14 . The combustible heat source according to  claim 1  further comprising one or more carboxylate burn salts. 
     
     
         15 . An aerosol-generating article comprising:
 the combustible heat source according to  claim 1 ; and   an aerosol-forming substrate downstream of the combustible heat source.