DE1068992B - - Google Patents

Description

GERMAN

The invention relates to an improved cigarette paper and in particular to an additive for this, which greatly improves the smoke and burning properties of the paper.

Currently manufactured cigarette paper usually consists essentially of a cellulose sheet, which contains various additives. These additives can be used to increase weight, regulate porosity, to influence the ash formation, to regulate the burning properties, to make them opaque and the like can be used. The respective additive and its amount become obvious largely determined by the properties desired for the finished cigarette paper.

In cigarette manufacture, it is essential that the cigarettes, while they are from an average Smokers do not tend to go out. It was found that burning can be regulated by incorporating additives into the cigarette paper, so that the cigarette does not stop burning under normal conditions. It is also important that the during The ash formed by smoking from the paper is such that it has a cylindrical ash shell that does not flake. A cigarette paper that breaks down while smoking is extremely undesirable, because the ash flakes fall off the cigarette as they are being formed, which is a constant nuisance for represents the smoker.

The object of the invention is a novel additive for cigarette paper that increases the burning rate the same regulates and ensures an uninterrupted and even burning of the cigarette paper.

Furthermore, when burned, it is said to form compounds which improve the aroma and smell, as a result of which the smoking pleasure is increased.

It is known that organic acids or salts of organic acids are added to the cigarette paper, to improve the burning properties.

The present invention relates to a cigarette paper containing a small amount of an additive has been incorporated, the one or more when smoking the cigarette made therefrom releases organic, odor-developing acids with 3 to 8 carbon atoms.

The additive for cigarette paper according to the invention consists of a sodium potassium salt of a substituted malonic acid of the following formula:

COOH

R-CH

Cigarette paper

COOH

Applicant:

RJ Reynolds Tobacco Company,
Winston-Salem, Ν. C (V. St. A.)

Representative: Dr.-Ing. H. Ruschke, Berlin-Friedenau,
and Dipl.-Ing. K. Grentzenberg, Munich 27,
Pienzenauerstr. 2, patent attorneys

Claimed priority: ¹ S V. St. v. America June 17, 1957

Edgar Hoskins Harwood ₁
Winston-Salem, N. C (V. St. A.),
has been named as the inventor

wherein R is an alkyl, alkenyl, aryl, aralkyl or other hydrocarbon group having 1 to 6 carbon atoms, is preferably 2 to 4 carbon atoms. As stated in U.S. Patent 2,766,145, these substituted malonic acids can be used as additives for smoking tobacco to reduce tobacco smoke to impart certain desired smells and aromas when burned. When salts this Substituted malonic acid incorporated into cigarette paper can produce the same smells and smells Aromas, presumably as a result of a combustion reaction when smoking, are obtained in which the substituted malonic acid compound is decarboxylated. The substituent R in the structural formula above is preferably either isopropyl or sec-butyl because isovaleric acid and 3-methylvaleric acid give the cigarette smoke a particularly desirable aroma or smell, so that the acids mentioned can be released during smoking, as from the U.S. Patent 2,766,145 can be seen. The radical R can, however, also be methyl, ethyl, η-propyl, n-butyl, normal or branched pentyl or hexyl, aryl, cycloaryl or a corresponding unsaturated radical as indicated in the cited patent.

For the correct regulation of the burning and ashing of the cigarette paper according to the invention serve the sodium and potassium salts of the substi-

909 648/347

Claims (4)

Allied malonic acids, either a mixture of disodium or dipotassium salts, a mixture of monosodium and monopotassium salts, or the sodium potassium salts. The sodium potassium salts of the formula: COONa R-CH COOK are preferred. It has been found that both sodium and potassium help prevent the paper ash from flaking easily, the potassium keeps combustion going, and the sodium promotes even combustion. The salts of the substituted malonic acids can be added to the cigarette paper in amounts between 0.1 and 5 / o of the dry weight of the cigarette paper. The salt additive can be incorporated into the paper either during papermaking or afterwards by soaking the paper with a solution of the salt and drying the soaked paper. The proposed salts can be applied to the paper in aqueous solution or dissolved in any other suitable solvent which leaves no characteristic smell or taste and which is preferably volatile. The latter solvents must of course not react with the malonic acid salts. The molar ratio of sodium to potassium in the additive is conveniently about 1: 1 in order to achieve the desired results. However, this ratio can vary between approximately 9: 1 and 1: 9. A particularly suitable cigarette paper is produced by soaking a suitable paper with an aqueous solution of sodium potassium sec-butylmalonate in such an amount that a paper with a content of 2 percent by weight (dry weight) of malonate is produced. The paper is then dried and used to make a cigarette. The burning and ash formation properties when smoking the cigarette are satisfactory, and the released 3-methylvaleric acid produces a desired aroma. The substituted malonic acids described herein are known, and the sodium and potassium salts thereof can be obtained by treating the acids with a basic sodium or potassium compound, e.g. B. the hydroxide or carbonate, can be prepared in a known manner. As is known, the sodium potassium salt can be prepared by treating the free acid with equivalent amounts of a mixture of the sodium and potassium containing bases. Patent claims: 1. Cigarette paper with an addition of alkali salts of organic acids, characterized in that that it contains sodium and potassium salts of substituted malonic acids of the following structure: COOH R-CH COOH wherein R is a hydrocarbon radical having 1 to 6 carbon atoms. 2. Paper according to claim 1, characterized in that the molar ratio of sodium to Potassium in these salts between about 9: 1 and 1: 9 and the amount of salt added to the paper is between about 0.1 and 5% of the dry weight. 3. Cigarette paper, characterized in that it is between about 0.1 and 5.0% of its dry weight of a sodium potassium salt of a malonic acid contains the following structural formula: COONa R - CH COOK wherein R is a hydrocarbon radical having 1 to 6 carbon atoms. 4. Paper according to claim 1, 2 or 3, characterized in that R is an alkyl group with 2 to 4 carbon atoms. Considered publications:
German patent specifications No. 591 744, 599 264,
039, 880 094. ©: i 9 648/3 «11.59