Aerosol Generating Material Composition for Lower TSNA Emissions
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Solution Overview
Problem
Existing aerosol generating materials containing tobacco with high levels of tobacco-specific nitrosamines (TSNAs) do not effectively reduce TSNA content when heated, and existing methods fail to synergistically lower TSNA levels without affecting aroma.
Innovation Solution
Incorporating a binder and a pH modifying agent into aerosol generating materials with a total content of N'-nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), N'-nitrosoanabasine (NAB), and N'-nitrosoanatabine (NAT) greater than 650 parts per billion (w/w), specifically using acacia gum, carboxymethyl cellulose, xanthan gum, and salts like calcium carbonate or sodium citrate, to reduce TSNA content upon heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a binder and pH modifying agent are added to aerosol generating material with high TSNA content (>650 ppb), then TSNA content in generated aerosol is reduced by 20-40%, but the material composition becomes more complex
Solution Approach 1:
The patent converts the harmful TSNA formation process into a beneficial reduction process by using the binder and pH modifying agent to alter the thermal decomposition pathway. The binder (e.g., polyvinylidene fluoride) and pH modifying agent (e.g., zinc stearate) work together to reduce TSNA content by 20-40% through chemical interaction during heating, transforming the harmful thermogeneration process into a controlled reaction that eliminates the harmful effect.
Solution Approach 2:
The patent creates a composite aerosol generating material system combining tobacco material with specific binder and pH modifying agent components. This composite structure allows the individual components to work synergistically - the binder provides structural integrity and controlled release, while the pH modifying agent creates optimal chemical conditions for TSNA reduction, achieving the dual benefit of maintaining material functionality while reducing harmful emissions.
2Object-affected harmful factors
If binder and pH modifying agent are used to reduce TSNA thermogeneration, then TSNA levels decrease, but the aroma quality may be affected
Solution Approach 1:
The patent optimizes the parameters of the binder and pH modifying agent to achieve TSNA reduction while preserving aroma. By carefully selecting the types and amounts of binders (e.g., 1-20% by weight) and pH modifying agents, the patent creates optimal chemical and physical conditions that suppress TSNA formation pathways while maintaining the thermal decomposition processes that generate desirable aroma compounds.
Solution Approach 2:
The patent applies the binder and pH modifying agent in specific locations and concentrations within the aerosol generating material to achieve localized TSNA reduction without affecting overall aroma quality. The pH modifying agent creates localized zones of optimal pH that prevent TSNA formation, while the binder distributes these agents uniformly to ensure consistent performance throughout the material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly lowers TSNA content in aerosols generated from these materials by 20% to 40% compared to materials without binders and pH modifiers, achieving synergistic reductions in NNN, NNK, NAB, and NAT levels without affecting aroma.
Implementation Method 1
This synergistic effect of TSNA reduction was also surprisingly found to result from reduced thermogeneration of TSNAs when aerosol generating materials comprising tobacco comprising a total content of NNN, NNK, NAB, and NAT of less than 650 parts per billion (w/w) is heated.
Data Source
Figure 1A~1D
Figure 2A~2C
Figure 3A~3D
AI summary
An aerosol generating material is described, for use in an article for use with a non-combustible aerosol-provision device. The aerosol generating material comprises tobacco material, a binder, and a pH modifying agent, wherein the tobacco material comprises a total content of N'-nitrosonornicotine (NNN), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), N'-nitrosoanabasine (NAB), and N'-nitrosoanatabine (NAT) of greater than 650 parts per billion (w/w).