438 



4.236.532 



3 4 



salt of nicotine such as nicoltne ascorbalc. nicoline ci- fer to the mam stream smoke of an additnc such av 



trate. nicotmc laciaic. nicotine succmale. niconne plios- nicoime When the active component is anotht-r o( iht* 



phale. nicolme tartrate, and nicolme hydrogen tartrate. additives, it would be desirable if both jddjlivc> mum- 



Dt-nico(tne tartrate might possibly be used but this is ally promote the transfer of one anotlier mio llic main 



less suitable as it tends to be unstable. The preferred s stream smoke. 



nicotine compound is nicotine tartrate or nicolme li>- In a typical experiment a wrapper was screen pruned 

 drogen tartrate with a series of dots of an ink conlainhig nicotinu hydro- 

 Two or more additives, if mutually compatible, may gen tartrate to provide a loading of about ,V5 mg ol 

 be incorporated in the same ink for deposition simulta- nicotine hydrogen tartrate per cigarette, and with a 

 neouslv- However, there is a prac'.ical limit to the 10 separate series of dois containing a similar loading of 

 amount of additive which can be deposited in this w-ay. l-docosene A total cumulative transfer of about 24Cr of 

 bearing m mind the maximum volume of each printed nicotine was obtained when a cigarette having a lo- 

 dot and the maximum quantity of additive which can be bacco substitute filler and incorporating the wrapper 

 carried m ihe ink. taking account of I he other ink com- was smoked, compared with 15% for a conlroi cigarette 

 ponents necessary to provide the ink with the necessary 15 of which the wrapper wjs not printed with the l-doco- 

 rhcological properties. If two additives to be deposited sene. A similar experiment in which the nicolme hydro- 

 are mutually incompatible, or if a loading of the wrap- gen tartrate and l-docosene were incorporated m a 

 per with the additives is required m e^cess of that which common series of dots led to a slightly lower cumula- 

 could be deposited in a single series of dots, different tive nicotine transfer but still some 50% higher '.lian 

 additives may be incorporated in different inks and 20 with the control cigarette 



printed m separate series of dots If the inks are mutually The inks used in the present invention differ from 



incompatible, care must be taken to ensure that the dots conventional priniing inks mainly in the fact that ihc 



of the different series do not overlap one another coloured component (pigment or dye) is replaced b\ 



\Vc have found most surprisingly that the presence of one or more of the above mentioned additives, and thai 



certain components in the printed deposit on the wrap- 25 Ihe other components of the ink are selected to be ac- 



per may significantly enhance the transfer of an adJilive ceptable for a smoking product 



m the deposit into the main stream smoke In this con- The ink will include a vehicle preferably in Ihe form 



text Ihc transfer of the additive relates to the amount of of a volatile hydrophilic liquid, for example water or an 



tlie additive which is carried by the main stream smoke organic solvent which dries off by evaporation Exam- 



through the smokmg rod to the mouih end and is (here- }0 pies of the latter are ethyl alcohol, isopropyl alcohol or 



fore available to the smoker The mechanics of additive mixtures of these. 



transfer arc nof wholly understood and are subject to 1'he ink is also given a suitable thickness and viscosity 



many variables such as the filtering effect of the smok- by the addition of a thickening agent, particularly a 



ing rod filler, the extern to which the volatile additive cellnlosic polymer such as carboxymethyl <.eIlulosc, 



condenses on the filler as it approaches the cooler 35 polymeihyl hydroxy cellulose, polyethyl hydrox\ eel- 



mouth end of the smoking rod. Ihe extent to which Ihe lulosc or hydroxy propyl cellulose. 



additive vaporises or sublimes \n\o the mam stream TTie ink may also contain hydrophobic resins which 



smoke when a puff is taken as distinct from being lost in will function as barriers to the diffusion of Ihe additives 



the side stream smoke between puffs, and the tempera- from the dots during storage 



lure of the burning tip of the smokmg rod However, an 40 Finally, m order lo give (he ink a certain "bod>' and 



important factor is believed to be ihe particle size ofthe to improve prinimg characlcristics. a charge in the form 



aerosol formed by the vaporising or subliming additive, of a Oiler, such as calcium carbonaie, tilanium dioxide, 



the smaller the particle size, the greater the Iransfcr It silicon dioxide, or a sihcale such as Deiiioniie may be 



is therefore believed that the close proximity of certain incorporated Non-dissolved additives may also consli- 



componenis reduces the particle size of the additive 45 tute a charge 



aerosol and hence promotes the transfer of the additive If the additive is applied in a uniform dislnhutiori 

 in the mam stream smoke The experiments have shown along the wrapper and hence along the smoking rod. 

 that It IS not sufficient for the component merely to be the uniform distribution ofthe additives does not lead to 

 present in the filler but to be present on the wrapper and uniform transfer of the additive into the mam stream 

 thereby active upon the initial additive aerosol forma- 50 smoke draw n through the rod. This is because the addi- 

 tion It IS believed that the effect depends on mutual live vaporises or sublimes inio the main stream smoke 

 interaction of ihe component and the additive, to form adjacent to the hot burning tip of Ihe rod but is parlialK 

 either a greater proportion of aerosol or a more stable recondensed and filtered as it passes along the cooler 

 aerosol. Examples which work with nicotine com- portion of the rod towards Ihe mouth end Upon subse- 

 pounds are components such as docosene. stearic acid. 55 qucnl approach ofthe burning tip, the additive is again 

 oleic acid, which have an affinity for free base nicotine transferred into \hj main stream smoke logclhcr with 

 In Ihe present context such component will be depos- ihe original additive at thai part of the rod. Il follows 

 iled alongside the additive by being incorporated with ihal the relative transfer of Ihe additive into the mam 

 Ihe additive in Ihe same series of printed dots, or depos- stream smoke progressively increases as the rod is 

 iled in a separate series of dots which may overlie those 60 smoked In order to compensate for ihis effect, the 

 of ihe firsl series additive is preferably reduced towards the mouth end 

 The component which promoles the transfer of the This helps to compensate for the uneven transfer of ihe 

 additive is nol necessarily a different additive which additives into the mam stream smoke Uy an appropriate 

 contributes to the smoker's salisfaclon. However, it is choice of Ihe concentrated gradient of additive along 

 clearly beiler if the component is another additive 65 ihe rod, it is possible to approach a substantially level 

 which contributes to the smoker's satisfaction and a transfer of the additive inio the mam Mrcam smoke 

 smoke nuclealion or smoke producing ageni has been puff-by-puff The concentration gradient of ihe additive 

 found to be effective m this way in enhancing the trans- along the w rapper can be precisely controlled when ihe 



