BAT BRITISH~AMERICAN TOBACCO COMPANY LTD A mrmkr olrhe O 8·T Idm~ric~ Group Ilth November 1987 Rcltl~ered 06cr: IIHIOET PO~xJB1 V~!lain~lc: Hru!r :Jlillhnk tondf n S1'I P IjE H. 1· ReynoldJ, Eso., Brovn b Ullllamson Tobacco Corporation, 'Trirx::3J I~TT*Z G louisville, Oeal lance, Co·ordlnstlon of Ultra Sllns Clgaretre ~eve!apnLn~s II~TRE R6D are pursuing means of producing ultra iou sldestrean, ultra slim cigarettes, Recently a patent application vas filed (copy attached) covering the use of iou visibility papers, ~pplleatfons are also being drafted for the use of iou penlablll~y papers and for burn retardan: papers used on conventional circ~ference cigarettes and :~rther vork is planned to cove: these items on ultra slims, Some simple ezpe~iPents using CRRI double vrapped using a !cv sfdestream Ecusca ~g0 only paper gives the folrovlng :esuIts:- product type puff 50, Sldestrea~ Ilg eig'L Yields PYlm T~U CO Capri 9,8 20,3 2,64 11 Capri Double Wrapped vith It,O 8,3 1,12 39 Ecusta HgO only Paper You mag veil decide to pursue these developoents using speeia! iou sidestrean papers on ultra slims for Jour pvn product ~eveloplLn: and, If so, I vould be grateful ii you vould keep me informed of sueh develsazJts~ Pith kind regards, Yours sincerely, b~L~ Heard c,c, Dr. R, Binns Dr, P~J, Duon Dr, C,J,P, de Slquelra Hr, J, 'Ihompson Into:;mlrd a ~ndalSunbrr'~o:J Clrin:Vliui~t Ifndnn SV'I Q C: I i I; PDF -!::!!::!!::!.f3 StlC.i: 0111 IMFROVEMENTS RELATING TO SllOhI~~ ARTICLES The invention the subject of this application relates to cigarettes and similar smoking articles, In United Kingdom Patent Specification No, 2 lt51891 there is a disclosure to the effect that cigarettes 5 having a circumference #fthin a range of 10 ma to 19 mm and a free burn rate of the cigarette rod of 25 to 50 ma mia'l exhibit lover smoke component sidestream deliveries than do conventional cigarettes, There are disclosed in United Kingdom Patent ID Specification No, 2 094 130A cigarettes comprising cigarette papers having air permeabilitles due to viscous now of not more than 3 Coresta Units and Dolt ratios in a range of 0,OB to 0t65 cm sec'l, where Do signifies the coefficient of oxygen through nitrogen in 15 the paper and t signifies the thickness of the cigarette paper, Such cigarettes exhibit loa deliveries of total particulate matter and nicotine in the sldestresm smoke, A further approach to the obtalnment of low component deliveries in the sidestream smoke of cigarettes 20 is by way of using cigarette papers comprising one or more sidestrela reducing compounds, Thus, lor elample, there is a teaching in united Kingdom Patent Specification No, 2 139 8691 that the total partfculate matter in the sidestream smoke emanating from the lit end of a 25 cigarette during the smoking thereof can be reduced by st least 301 if the cigarette paper comprises one or more, Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 4' preferably a pluralfty, of compounds of the group consisting of lithium hydroxlde, aluminium hydronide, calcium hydroxide, potassium formats, sodiurn formate and sodium acetate, 5 Another enample pi the use of sidestream reducing compounds is disclosed in united States Patent specification No. 4,231,377, according to the teaching of which magnesium oxide and an adjuvant salt are Incorporated in combination in cigarette paper, 10 It is an object of the subject invention to provide an improved·lov sldestream cigarette or similar smoking article, The subject invention provides a smoking article comprising a smoking material rod, which rod comprises 15 smoking material and a gaper wrapper circumscribing said stoting material, said rod not exceeding 20 Blm in circumference and said wrapper being of a piper which when providing a wrapper of a smoking material rod of conventional cigarette circumference effects a reduction 20 of at least 301 in visible eldestreala smoke compared Pith a control rod of the same conventional cigarette circumference and comprising conventional cigarette paper, The smoking material of smoking articles according 25 to the subject invention preferably comprises or consists of cut tobacco, a proportion of which tobacco may be expanded tobacco, Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 The length of the smoking material rod is advantageously at least 60 am and the rod should yield not less than seven puffs when smoked under standard machine smoking conditions, The rod is preferably of uniform crcss-sectlonal shape and dimensions throughout the length of the rod, If the rod is of circular cross- section, the circumference of the rod mag be as low as 10 mm for example, Preferably, cigarettes according to the present lO invention comprise filter or mouthpiece means attached to the smoking material rod at one end thereof, The pager trappers or smoking articles according to the subject invention are of lot permeabillty, not exceeding 12 Coresta Units for example, and/or comprise 15 a stdestream reducing compound(s), In order to further the understanding of the present invention, examples according thereto will now be described, The draPlng hereof shots a cigarette dth a tipping 20 wrapper thereof shown partially unwrapped, EXaMPIE I There was produced a cigarette 1 consisting of a 20 mm circumference cigarette rod 2 of 64 ma length and a cellulose acetate filter 3 of 20 mm length attached 25 to the rod 2 by means of a tipping wrapper 4, The rod 2 comprised a cut tobacco filler 5 having a density of 240 mg Em'3, which filler nas trapped in a circumscribing Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 cigarette paper wrapper B of 19 Corestl Boits permeability lad a blsie weight ol 45 gin m-2, The cigarette piper arapper comprised 231 chalk, 81 magnesiluo hydroxfde and 2X sodium acetatel 5 Ihen cigarettes as per cigarette 1 rere smoked under standard machine smoking conditions, i,e, a 35 cm3 puff of 2 seconds duration every minute, to a cigarette rod butt 8 mm long, the total yield of sidestream particuiate matter, on a water and nicotine Iree basis, 10 was 912 mg, the total yield of sidestream carbon dioxide being 34,3 lag. The ouolber of puffs during smoking vas 8,9, ~~IIPIE ii Cigarettes were produced consisting of 20 mm 15 circumference, 64 ma long, cigarette rods and 20 mm long cellulose acetate tilters attached to the rods by tipping wrappers. The cigarette rods comprised a cut tobacco filler of a density of 287 mg cm-3 and cigarette paper wrappers of 11 Coresta Units permeabflitg and a 20 basis veight of 43 gm'2, The cigarette paper anpper comprised 19,58 chalk, 5·08 magnesiun oxide and 6,2'1 citrate tri-potassium (expressed as g anhydrous citric acid). These cigarettes, smoked under standard machine smoking conditions, produced a total yield of sidestream 25 particulate matter, rater and nicotine free, of 13,3 mg and a total yield ct sidestream carbon dioxide of 36.8 mg, The cigarettes yielded 8,3 puffs, Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 ··f·_ 1_1_ C· ·I_ C EXAIP1E III Cigarettes were produced consisting of 1'1 rrm cfrcumference,'lD mm long cigarette rods and 2'1 mm long cellulose acetate tilters, The density of the cut 5 tobacco rod tiller of the cigarette rode was 293 mg cm'3 The cigarette rod wrappers were of cigarette paper of 26 Coresta units permeablltty and a basis weight of 26 gm-2, The paper did not contain sldestrea~ reducing compounds, Some of these cigarettes were overwrapped 10 with a second cigarette paper, which second paper was of 15 Coresta Units permeabilitg and of a basis weight of 50 gm'2, The eeeood piper comprised 4,5% chalk, 24l3% magnesium hydroxide and 3,611 sodium 8cetate, When the overwrapped cigarettes were smoked under 15 standard smoking conditions it was determined that each produced a total yield of aldestream Carticulate matter, water and nicotine free, of 8,3 mg and total yields of sidestream carbon monoxide and nicotine of 39,1 mg and 1,i mg respectively, The puff number of the overurapped 20 cigarettes was 12, When the non-over~npped cigarettes were smoked under the same conditions, the total yields of sidestream particulate matter, water and nicotine free, carbon monoxide and nicotine were 20,7 mg, 45 mg and 2,1 mg respectively, 25 Two types of control cigarette were smoked, each having a 64 ma long cigarette rod ct a conventional 24,'15 mm circumference, The first type of control Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 'Y' cigarette comprised a conventional cigarette paper wrapper of 41 Coresta units pereeability, a basis weight ol 25 gm-2, the wrapper comprising 262 chalk and 0.8X tr~·potass~um citrate, when the first type of control 5 cigarette was smoked under standard smoking conditions, It was found to deliver a total yield of sidestream nicotine of 4,9 mg. As noted above, the total sldestream nicotine delivery for the non-overwrapped 11 mm cigarettes was 2~f mgl It may thus be observed that 10 with the cigarettes comprising conventional cigarette paper wrappers, a reduction of cigarette rod circumference to an unconventional 17 mm, from a conventional 24175 mm, reduces the sidestream nicotine by 45R, The second type of control cigarette comprised a 15 cigarette paper wrapper of the same type of paper as used to dverwrap the above mentioned oversrapped 11 mm cigarettes. When the second type of control cigarette was smoked under standard smoking conditions, it was found to deliver a total yield of sfdestream nicotine 20 of 2,5 mgl when this sidestream nicotine yield is compared with that of the first type at control cigarette, It map be observed that the substitution of the sidestream reducing cigarette paper for the conventional cigarette paper of the first type of control cigarette effects a 25 49% reduction in sfdestream nicotine yield, From the above it would be expected that by combining in a single cigarette the two sidestream nicotine Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 reducing features, namely I reduction In cigarette circumference from 24,75 arm to 1'1 nml and the substitution of a conventional cigarette paper by a sidestream reducing cigarette paper, that the total sidestream 5 nicotine yield would be reduced to 28X of that of a conventional cigarette comprising neither of the features, which conventional cigarette Is represented bg the first type of central cigarette, In point of fact though, the 17 mo circu~nlerence overlvrapped 10 cigarettes, which, of course, do comprise each of the two sfdestream reducing features, effect a reduction in total sfdestream nicotine yield to a value, namely 1.1 mg, which is 22,51 of that of the first type of control cigarette, Thus the overwrapped 1? mm circumference 15 cigarettes exhibited a synergistic sidestream nicotine reduction effect, Clit; PDF -!::!!::!!::!.f3 StlC.i: 0111 3 4 6 r^h/ I1 a o o w a O ClibPDF - v~~fastio.soni