Chemical heat source comprising metal nitride, metal oxide and carbon
First Claim
1. A method of making metal nitride, comprising the steps of:
- a) mixing a metal species and a carbon source to form a mixture;
b) supplying heat to the mixture; and
c) contacting the mixture with a nitriding material to form metal nitride.
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Abstract
A chemical heat source comprising metal nitride, metal oxide and carbon, particularly useful in smoking articles, and methods of making the heat source are provided. The metal nitride of the heat source has an ignition temperature substantially lower than conventional carbonaceous heat sources, while at the same time provides sufficient heat to release a flavored aerosol from a flavor bed for inhalation by the smoker. Upon combustion the heat source produces virtually no carbon monoxide. The metal nitride is prepared by pre-forming the starting materials into a desired shape, and converting them to metal nitride in situ, without substantially altering the shape of the starting materials.
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Citations
56 Claims
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1. A method of making metal nitride, comprising the steps of:
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a) mixing a metal species and a carbon source to form a mixture; b) supplying heat to the mixture; and c) contacting the mixture with a nitriding material to form metal nitride. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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2. A method of making a heat source comprising metal nitride, comprising the steps of:
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a) mixing a metal species and a carbon source to form a mixture; b) combining the mixture from step a) with a binder; c) forming the mixture from step b) into a shape; d) supplying heat to the mixture; and e) contacting the mixture with a nitriding material to form metal nitride. - View Dependent Claims (12, 13, 29)
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- 43. A heat source comprising metal nitride, wherein the heat source is substantially in the form of a cylindrical rod and has one or more fluid passages therethrough.
- 49. A heat source for use in a smoking article comprising metal nitride, low valency metal oxide and carbon.
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55. A heat source comprising metal nitride, low valency metal oxide, and carbon.
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56. A smoking article comprising a heat source, wherein the heat source comprises metal nitride.
Specification