437 



4,236,532 

 1 2 



micro-capsules of flavouring or aromatic niaicriat hu! 



SMOKING ROD WRAPPER this involves a coaling oflhe whole surface of thu wr.ip 



per winch will effect undesirjhiy us flcMbilitv. ventil.i- 



The present invention relates to vi'rappers for smok- iioii and combustion properties The aclJiiioii lo j ijliL^t 



ing rods, such as cigarettes, cigars and cigarillos. com- < of the smoking rod of components which are to K- 



prising a combustible lubuiar wrapper, usually made of Irinsferred to the smoke is already current pr^iclice. hul 



paper or a tobacco based material, surrounding a com- tins is limited lo quite volatile materials, for example a 



buslible filler of tobacco and/or tobacco subslitule flavour such as menthol. 



It is accepted thai the smoke produced by the coin- In accordance with the present invention, a nieiliod 



bustion of tobacco products contains a number of irri- 10 of producing a wrapper for a smoking rod comprises 



tating substances. Many proposals have been made for screen printing onto the surface of the w r.ippei a series 



reducing ihe amount of such substances inhaled by the of discrete dots of an ink containing an addilive w inch 



smoker These proposals fall into three groups In the will in use. upon approach of the hot burning up of the 



first group are those which aim to reduce the amount of smoking rod. be transferred and contribute lo Ihc nijin 



irritant material which is produced during the combus- 15 stream smoke drawn through the rod to enhance the 



lion process itself, for example b\ the use of different satisfaction to the smoker 



types ol tobacco or tobacco blends, by special process- We have found thai appreciable adsaiii.ices arise 



ing or extraction, by the partial or total replacement of from this method. Thus the amount and location of 



tobacco with so-called tobacco substiiulcs, or bv vatia- additive deposited on Ihe surface of ihc w rapper car be 



Hon of Ihe combustion temperature The second group 20 precisely controlled and thereby transferred :nio ihe 



relates to the dilution of the smoke before it reaches the main stream smoke in a controlled manner The paper 



smoker's mouih. for example by ihe use of a highly or other wr.npper retains its flexibility and combustibil- 



permeable paper or by Ihe perforation of the paper or ity more or less unchanged. Furthermore, and b\ coni- 



filtcr The third group relates lo Ihe conslruction oflhe parison with gravure printing, the screen priming of ihe 



filter Itself, to achieve high filtration efl'iciency or ihc 25 dots enables dots of greater height and more accurate 



selective removal of paiticular smoke componenis definition to be deposiied so that an acceptably high and 



Whilst these proposals can lead to a significant rediii;- accurate loading of the addilive can be applied, m prac- 



lion in the inhalation of undesirable smoke components. lice up to 5 mg/sq cm . whilst leaving an .iccepiably 



this reduction is accompanied by a parallel decrease in high proportion of the surface area of the w rapper free 



the satisfaction afforded lo the smoker Tins is because 30 of dots. 



it IS difficult to reduce the tar yield of the product or Ihe The wrapper may he printed with the addiii\tcon- 



irritancy of the smoke without at Ihe same lime reduc- taming ink on Ihe surface which will become eimer ihc 



ing the amount of desirable componenis made available inner and/or ouler surface of the wrapper in use bin 



to the smoker or impairing the flavour of the product preferably it is printed on the inner surface of the wrap- 



The present invention is concerned w ith the applica- 35 per where it is least likely to be disturbed upon handling 



tion of additives, such as smoke producing agents. of the smoking rod. 



smoke nuclealion agents, fiavounng agents, and physio- the additive will be one or more of a smoke produc- 



logically active agents such as nicotine componenis to nig agent, a smoke nuclenlion agent, a navounne agent. 



Ihe smoking rod. in order to improve or help to improve and a physiologically active agent 

 ihe satisfaction provided lo the smoker This is parucu- 40 The additives will generally be compounds winch 



larly useful for low tar products incorporating tobacco transfer into ilie main stream smoke without undergoing 



or tobacco siibslitute appreciable Ihe/mal degradation, which give llie rc- 



II has previously been proposed to apply such addi- quired salisfaclion lo the smoker, and which are know n 



live to the filler material and it is well know that ccnain lo present no significant health hazards They may also 



malenals arc already added in practice lo the filler 45 be. or include, compounds which undergo thermal deg 



However, it is almost impossible to obtain a conccntra- radatioii during the transfer process, which the prod- 



lion profile of the additives over the smoking length in ucts of such degradation are known, present no healUi 



order to control Ihe puff-by-puff transfer to I he smoker. hazards, and provide the required satisfaction lo llie 



and indeed local concentrations of an addiine such as smoker. 



nicotine could be undesirable It has been proposed SO Suitable smoke producing agents include esters such 



(Bri'ish Patent Specification No. 1.342.931) to inject as methyl palmitate. methyl sicaiaie. vinyl steaiaie. 



additives through ihe wrapper into the filler material dimethyl seb.acate. dimethyl dodecandioale. dimethyl 



but this IS not entirely satisfactory because of paper teiradecandioalc. glyceryl trimyrislaie. pentacrvihriiyl 



perforation and because of the discontinuous distribu- tetraacetate, monoethyl sebacale. irunellul citrate, mv- 



lion of the additive. It has also been proposed (British 55 ristyl myristate. palmilyl palmitate. glyceryl nioiii>siea- 



Palenl Specification No 1.111.007) to impregnate the rate, glyceryl trilaurate. vinyl oleate. and dieihyl hexyl 



wrapper with a nicotine component but ihis is unsalis- sebacale Other suitable smoke producing agents in 



factory as controlled distribution of the nicotine is un elude docosene. myrislic acid (telradecanoic acid) lan- 



cerlain and the combustion cliaracierisiics of the wrap-"" bntol wax (a blend of ceiyl alcohol and sicaryl alcohol 



per arc changed It has been proposed (Uritish I'ulent 60 with a celyl/oleyl alcohol ether of polyethylene gly- 



Specification No 1.351.560) lo gravure print a burn col), beeswax (mairly consisting of myricyl palmitate 



accelerating agent in a series of small squares lo control and cerotic acid), and ceresinc wax Of these glyceryl 



Ihe speed at which the wrapper burns hut tins does not trimynslate is preferred 



contribute to the solution of the problem of the transfer A suitable smoke nuclealion agent is ammonium clilo- 



of additives lo the main stream smoke to enhance the 65 ride 



smokers' satisfaction It has also been proposed (Aus- The invention is particularly useful for the applica- 



irian Pateni Specification No 277.028) lo apply lo a lion to a smoking rod of a physiologically active mco- 



wrapper a coaling in the form of a liquid dispersion of tine compound Such a compound may include a stable 



