Patent EP0117355A2 successfully refreshed from Google Patents.
EP0117355A2
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EP
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Process for making a carbon heat source and smoking article including the heat source and a flavor generator
Assignee: Philip Morris Products Inc
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Filing: 1983-12-08
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Granted: —
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Expires: 2003-12-08
Abstract
Abstract The present invention relates to a process for producing a tasteless carbon heat source from a preformed article of a lingo-cellulosic material according to which the article is pyrolyzed in a continuously exchanged inert atmosphere at a temperature within the range of from about 800° to about 1100 °C, for from about 0.5 to abour 3 hours, then cooled in the inert atmosphere at a rate of from about 500° to about 10°C per hour to a temperature within the range of from about 275°C to about 25°C, and then subjected to at least one additional process step selected from an oxygen absorption step, a salt impregnation followed by heat treatment step, and a water desorption step. The present invention also relates to a smoking article including the carbon heat source, and a flavor generator comprising a substrate material containing at least one thermally releasable flavorant.
Inventors
- 👤 John R. Hearn
- 👤 Harry Vincent Lanzillotti
- 👤 George Henry Burnett
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 04:44
CPC Classifications
A; A24; A24B; A24B15/00; A24B15/10; A24B15/16; A24B15/165; A24C; A24C5/00; A24D; A24D1/00; A24D1/22; A24D3/00; A24D3/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for producing a tasteless carbon heat source by pyrolizing a preformed article of ligno-cellulosic material, characterized by pyrolizing the article in a continuously exchanged inert atmosphere at a temperature in the range of 800° to 1100°C for 0.5 to 3 hours, cooling the pyrolized article in the inert atmosphere at a rate of 500° to 10°C per hour to a temperature within the range of 275°C to 25°C, and then subjecting the pyrolized article to at least one additional treatment selected from oxygen absorption, water desorption, and salt impregnation with subsequent heat treatment.
Claim 2
Dependent Claim
95 words
A process for producing a tasteless carbon heat source by pyrolizing a preformed article of ligno-cellulosic material, characterized by pyrolizing the article in a continuously exchanged inert atmosphere at a temperature in the range of 800° to 1100°C for 0.5 to 3 hours, cooling the pyrolized article in the inert atmosphere at a rate of 500° to 10°C per hour to a temperature within the range of 275°C to 25°C, and then subjecting the pyrolized article to at least one additional treatment selected from oxygen absorption, water desorption, and salt impregnation with subsequent heat treatment.
Claim 3
Dependent Claim
28 words
A process according to claim 1, characterized by adding oxygen to the pyrolized article and then, as a final step, subjecting the pyrolized article to a desiccant environment.
Claim 4
Dependent Claim
108 words
A process according to claim 1, characterized by contacting the pyrolized article with a salt solution comprising a salt of at least one of the cations K + , Fe +3 , Fe , Mg , Mn , Ca , drying the article at a temperature within the range of 50° to 70°C in.vacuum, gradually heating the article to a temperature of about 650°C in an inert atmosphere and maintaining the article at said temperature for 5 to 60 minutes, and then cooling the article in the inert atmosphere at a rate of 500° to 10°C per hour to a temperature within the range of 275°C to 25°C.
Claim 5
Dependent Claim
19 words
A process according to claim 3, characterised by adding oxygen to the pyrolized article after the second cooling step.
Claim 6
Dependent Claim
23 words
A process according to claim 3 or 4, characterized by subjecting the p yrolized article to a desiccant environment, as a final step.
Claim 7
Dependent Claim
25 words
A process according to any of claims 3 to 5, characterized in that the pyrolized material is contacted with the salt solution by vacuum impregnation.
Claim 8
Dependent Claim
26 words
A process according to any of claims 1 to 6, characterized in that cellulosic material is selected from cardboard, paper, bamboo, oak leaves and extruded tobacco.
Claim 9
Dependent Claim
76 words
A smoking article comprising a carbon heat source produced by a process according to any of claims 1 to 7, characterized in that the heat source is substantially tubular and has a porosity sufficient to support combustion and a density such that puff induced air flow passes through the tube, and that a flavor generator is disposed adjacent the mouth end'of the article and comprises a substrate material impregnated with at least one thermally releasable flavorant.
Claim 10
Dependent Claim
31 words
A smoking article according to claim 8, characterized in that the substrate is selected from alumina, tobacco filler, magnesium hydroxide, zeolites, glass wool, charcoal, fuller's earth, natural clays, and activated clays.
Claim 11
Dependent Claim
34 words
A smoking article according to any claim 8 or 9 characterized by a porous, combustible material disposed within the tube passage and having a porosity greater than the porosity of the carbon heat source.
References Cited (Backward Citations)
No citation records indexed.
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