Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/14—Use of materials for tobacco smoke filters of organic materials as additive

Definitions

• This invention relates to a tobacco filter which has a high rate of removal for harmful and hazardous substances contained in tobacco smoke.
• materials of tobacco filter various kinds have so far been proposed, such as cellulose acetate, paper, rayon, polypropylene, etc., and some of those materials have already been in practical use, but they are not necessarily the satisfactory materials for tobacco filter, when viewed from the removal effect of harmful or hazardous substances, particularly carcinogenic substances, contained in tobacco smoke.
• the present invention is, therefore, in a tobacco filter which is characterized by that a phthalocyanine compound, or a phthalocyanine compound with a highly water-absorbing material, is present in the material of tobacco filter.
• various methods may be available, such as a method to add the phthalocyanine compound per se into the filter material, a method to have the phthalocyanine compound adhered to the filter material, a method to have it chemically bound to the filter material, and a method to insert a member made of other material to which the phthalocyanine compound is adhered or combined, into the filter material.
• phthalocyanine which constitutes the phthalocyanine compound may be such phthalocyanines as non-metallic, and those containing copper, nickel, cobalt, aluminum, iron, etc.
• the phthalocyanine compound in this invention is well known in the dyestuff and pigment industries, and in this invention, it is advantageous to use the phthalocyanine compound such as phthalocyanine pigments, phthalocyanine direct dyes, phthalogen dyes, sulfer dyes, vat dyes, reactive dyes, etc.
• Dyestuffs other than reactive dyes and pigments are suitable for being added or made to adhere (dyeing) to the material, while reactive dyes are suitable for being chemically bound to the base material.
• the filter material may be any of known products such as cellulose acetate, cotton, paper, rayon, polypropylene, and water, or other materials such as protein, polyamide, polyvinyl alcohol and its modified products, silica gel, and polystyrene. These materials may be used in the form of fiber, powder, beads, solution, etc.
• the material suitable for binding reactive dyes may be organic or inorganic substances having hydroxy group, amino group, mercapto group or carboxylamide group, for example, polysaccharides, e.g. cellulose, starch, Sepharose made by Pharmacia Co., etc., proteins, e.g. wool, silk, etc., polyamides, e.g. nylon, polyacrylamide, etc., polyvinyl alcohol or its modified products, silica gel, etc.
• the phthalocyanine compound is appropriately added, or made to adhere or to chemically bind to these materials by the known methods.
• a highly water-absorbing material in the form of fiber or powder with the filter material during the course of its making.
• Such water-absorbing material is used to hold the moisture in the filter during smoking. It may be used in a fairly large amount, but, from the viewpoint of maintaining the strength of the fiber, the amount is preferably not more than 10 wt.% of the filter.
• a highly water-absorbing polymers are preferred, which may be, for example, graft-copolymers of starch/sodium acrylate, copolymer salts of isobutylene/ maleic anhydride, copolymer salts of styrene/maleic anhydride, cross-linked sodium polyacrylate, graft-copolymers of polyvinyl alcohol/acrylate, saponified copolymers of vinyl ester/ethylenically unsaturated carboxylic acid or its derivative, and the like.
• high molecular weight electrolytes containing carboxylate salt are polymers with a high rate of water-absorbing capacity, and yet have an excellent strength even after having absorbed water. They are preferred materials for this purpose.
• An example is "Sumikagel F-33", produced by Sumitomo Chemical Co., Ltd. or cross-linked sodium polyacrylate.
• the filter according to this invention effectively removes by adsorption harmful or hazardous substances present in tobacco smoke, for example, harmful aromatic compounds and heterocyclic compounds, in particular, those compounds having two, particularly more than two, aromatic rings, such as benzopyrene, preferably in the presence of moisture, though the absence of moisture is not a precluding condition.
• harmful aromatic compounds and heterocyclic compounds in particular, those compounds having two, particularly more than two, aromatic rings, such as benzopyrene, preferably in the presence of moisture, though the absence of moisture is not a precluding condition.
• the tobacco filter may usually be present in a cigarette holder or pipe, but, depending on the type of the material used, it may be equipped at one end of cigarette.
• Phthalocyanine used in this invention for example, copper phthalocyanine, may be shown as a compound having the followinq skeleton, hereinafter referred to "CuPc".
• Phthalocyanine compounds used in this invention are described as pigments or dyes in literatures, for example, on pages 316 - 1109 of the New Edition, "Dyestuff Guidebook” edited by the Synthetic Organic Chemistry Association, Maruzen Co., Ltd., published on July 20, 1970, or the Color Index. As concrete examples, the following compounds may be cited.
• dyes may be added, adhered, or bound to the substrate by the known methods.
• a reactive dye may be bound to a cellulose substrate in a water medium in the presence of an alkali agent.
• the phthalocyanine compound thus obtained may be placed in the filter material, preferably in wet atmosphere, though dry atmosphere is not precluded.
• the blue colored cotton was separated by filtration using a Buchner funnel, and put into 900 ml of water containing 1.8 g of "Monogen" (a detergent made by Daiichi Kogyo Seiyaku Co., Ltd.: sodium alkylbenzenesulfonate).
• the soaping was effected for 5 minutes at 100°C.
• the cotton was separated by filtration using a Buchner funnel, rinsed extensively with water, and dried.
• the cotton was then washed sequentially with dimethylsulfoxide, methanol-concentrated hydrochloric acid (volume ratio 50:1), methanol-concentrated ammonia water (volume ratio 50:1) and methanol, until the washing liquids gave no coloration. Then, the cotton was dried.
• the blue sanitalized cotton thus obtained was subjected to the analysis of its copper content according to the atomic absorption spectrum method.
• the content of copper was 0.065 %. Accordingly, 1 g of the cotton should contain 1.0 x 10-6mol of phthalocyanine unit. This material is hereafter referred to as "blue-cotton A”.
• C.I. Vat Blue 29 (“Nihonthrene Brilliant Blue 4G Paste”: made by Sumitomo Chemical Co., Ltd.) and one part of sodium alginate were added to water to prepare 100 parts of a dye bath. A cotton broadcloth was immersed into this dye bath and was squeezed to 60 % squeeze rate and then dried in hot air at 105° C .
• a tobacco filter was prepared and packed into a glass tube of 8 mm in inner diameter and a length of 15 mm.
• the thus-prepared glass tube with a filter was fixed to a constant flow rate smoking device.
• the test results obtained are shown in Table 1. The results indicate that it is effective for the removal of mutagens selectively, when compared with the case where no copper phthalocyanine compound was present in the filter.
• the rate of removal of tar, the rate of removal of mutagens and the suction resistance were measured by the following methods.
• a smoking was effected under such conditions that the smoking period of time is 2 sec. per each suction, with intervals between the suctions are each 40 sec., smoking length is 50 mm, and smoke flow rate is 16 ml/sec.
• the main streams of the smoke of 4 tubes were collected with one Cambridge Filter CM 113, and the amount of tar was measured by a weight method.
• the measured value is the mean value of 20 cigarettes, and the third digit of effective number was rounded by the rule of counting fractions of 0.5 and over as a unit and cutting away the rest.
• the rate of removal of mutagens was measured by mutagenicity revealed by the Ames Test.
• the strain used in the test was TA 98, and the number of revertant colonies was measured with a condition of the tar caught in the Cambridge filter of 300 pg/plate S9 : 80 ⁇ l/plate.
• the suction resistance was measured against the stream at the flow rate of 20 ml/sec. using a aeration resistance meter.
• a tobacco filter was prepared with each of the materials obtained in the References and a highly water-absorbing material. It was packed in a glass tube with inner diameter of 8 mm and a length of 15 mm. The thus-prepared glass tube with the filter was fixed on a constant flow rate smoking device. The results obtained are shown in Table 2.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Cigarettes, Filters, And Manufacturing Of Filters (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Applications Claiming Priority (4)

Publications (2)

Family

ID=26401559

Family Applications (1)

Country Status (5)

Cited By (5)

Family Cites Families (1)

• 1984
  • 1984-03-27 AU AU26133/84A patent/AU2613384A/en not_active Abandoned
  • 1984-03-30 EP EP84302230A patent/EP0121436A3/fr not_active Withdrawn
  • 1984-04-04 DK DK178484A patent/DK178484A/da not_active Application Discontinuation
  • 1984-04-04 NO NO841332A patent/NO841332L/no unknown
  • 1984-04-04 BR BR8401575A patent/BR8401575A/pt unknown

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