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Publication numberUS2580610 A
Publication typeGrant
Publication dateJan 1, 1952
Filing dateMay 29, 1951
Priority dateMay 29, 1951
Publication numberUS 2580610 A, US 2580610A, US-A-2580610, US2580610 A, US2580610A
InventorsLevy Robert M, Schur Milton O
Original AssigneeEcusta Paper Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cigarette paper
US 2580610 A
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Description  (OCR text may contain errors)

Patented Jan. 1, 1952 CIGARETTE PAPER Milton 0. Schur, Asheville, and Robert M. Levy,

Brevard, N. 0., assignors to Ecusta Paper Corporation, a corporation of Delaware No Drawing. Application May 29, 1951, Serial No. 228,982

2 Claims. 1

Our invention relates to cigarette paper and more particularly to improving the ashing properties of cigarette paper when burned as the wrapper on a cigarette.

A desirable paper ash is one that has a minimum of carbonized or incompletely burned resi due, has a grayish-white color, adheres to the tobacco ash and thereby avoids dropping of ashes on the smokers clothing, but is nevertheless easily flickable at the will of the smoker. The usual cigarette produces black, curling ashes that fall from the cigarette onto the smokers clothing.

In the application of Robinson E. Matthews and Ward D. Harrison, Serial No. 162,402, filed May 16, 1950, there is disclosed a cigarette paper having the above-mentioned desirable ashing properties, which are obtained by-incorporating in the paper approximately 0.2% to 1% of ammonium phosphate. Under certain storage conditions of the cigarette paper, particularly those involving an atmosphere of high humidity, we have found it desirable to increase the permanency of these ashing properties and we have discovered that this can be done by incorporating in the paper, in addition to the ammonium phosphate, a, small amount of phosphoric acid.

The amount of phosphoric acid required for efiecting this stabilization of the ashing properties is minutely small in relationship to the weight of the cigarette paper or even to the weight of the ammonium phosphate. For example, we have found a good practical percentage range for the phosphoric acid is about 0.002% to 0.05% based upon the dry weight of the paper, where the amount of ammonium phosphate is within the range of about 0.1% to 1.0%. A commercially advantageous amount of phosphoric acid is about 0.02% when the ammonium phosphate, used as mono-ammonium phosphate, is present to the extent of about 0.4% based upon the dry weight of the paper. This minute amount of phosphoric acid greatly improves the stability, over a long period, of the initially excellent ashing properties of the above-mentioned type of cigarette paper.

The incorporation of the stabilizing, free, i. e., uncombined, phosphoric acid may be efiected. in aqueous solution, by addition to the dry cigarette paper, although it may be more expeditious to apply it to the partially dried paper web running on the paper machine prior to the final drying rolls. A convenient form of application is bymeans of the conventional sizepress, located near the middle of thedrying sec- 2 tion onthe paper machine, so that the aqueous phophoric acid solution will be imparted to the dry or partially dried paper sheet.

A typical but non-restrictive formula for the liquid compositiomcontaining both the ammonium phosphate and the phosphoric acid, applicable in the size-press, is as follows:

Formula I Monoammonium phosphate lbs 38 Phosphoric acid -gals 0.15 Water gals..- 1,000

Formula II Monoammonium phosphate --lbs 36 Phosphoric acid (85%).. gals 0.15 Urea formaldehyde wet-strengthening agent lbs. (dry basis) 4 Water gals..- 1,000

An illustrative commercial procedure for using the present invention in the manufacture of cigarette paper,is as follows:

Asheet of cigarette paper was formed in the conventional manner from afurnish comprised of beaten flax pulp and calcium carbonate filler. At a point in the drier where the water content of the paper was about equal in weight to. the dry weight of the fiber and the filler, the paper was run through a size-press and impregnated with a solution prepared according to Formula I above. A weight of solution about equal to the weight of the dry contents of the paper was imparted to the paper, and the paper was then completely dried by passage over drying. cylinders in the conventional manner. H

The filler commonly used in cigarette paper to regulate the porosity, and hence the rate at which it burns on the cigarette, is calcium carbonate. It is ordinarily added to; the flaxpulp furnish in an amount suflici'ent to give a filler content of about,20%-25% in the finished paper,

. 3 and it constitutes the principal ash-tannin: constituent in the cigarette paper.

This stabilizing eiiect of the phosphoric acid is of special significance when the cigarette paper is on the cigarette because the'cigarette tobacco is moist and that condition accentuates the usual instability of the ashing properties of the paper. Cigarette rolled in the paper, prepared as abovedescribed, burned so as to leave fine, discontinuous flakes of paper ash, which closely adhered to the tobacco ash, and these cigarettes upon storage retained their fine ashing properties, when burned. to a much better extent than when the phosphoric acid was not used.

This application is a continuation-in-part of our application Serial No. 4,924 filed January 28, 1948, now abandoned.

Various modifications and changes may be made in the foregoing process, materials and products, without departing'from-the spirit and scope of our invention as defined in the appended claims. a

We claim:

1. A combustible, cellulose ciaarette paper containing cellulosic fibers, calcium carbonate filler, and impregnated throughout with approximately 0.1% to 1% ammonium phosphate (expressed as P04) and approximately 0.002% to 0.05% phosphoric acid based on the dry weight 01 the cigarette paper.

2. A combustible, cellulose cigarette paper containing predominantly cellulose fibers, approximately 20% to calcium carbonate illler, and impregnated throughout with 0.1% to 1% am-" monium phosphate (expressed at PO), and approximately 0.002% to 0.05% phosphoric acid based on the dry weight of the cigarette paper.

MILTON 0. 868173,. ROBERT MLLEVY.

No references cited.

Non-Patent Citations
Reference
1 *None
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2673565 *Nov 9, 1951Mar 30, 1954Ecusta Paper CorpCigarette paper
US2754207 *Aug 30, 1951Jul 10, 1956Ecusta Paper CorpProcess of improving paper formation
US2927588 *Dec 10, 1957Mar 8, 1960Gerlach Gmbh EMethod of producing tobacco foils
US4452259 *Jul 10, 1981Jun 5, 1984Loews Theatres, Inc.Smoking articles having a reduced free burn time
US4516589 *May 18, 1982May 14, 1985Philip Morris IncorporatedAmmonium or alkali metal salt and cellulose
US4998543 *Jun 5, 1989Mar 12, 1991Goodman Barbro LSmoking article exhibiting reduced sidestream smoke, and wrapper paper therefor
US5161551 *Apr 12, 1991Nov 10, 1992Philip Morris IncorporatedPaper wrapper having improved ash characteristics
US5263500 *Apr 12, 1991Nov 23, 1993Philip Morris IncorporatedCalcium carbonate mineral filler
US5540242 *Jul 7, 1993Jul 30, 1996Brown & Williamson Tobacco CorporationFilm forming alginate and burn additive
US7216652Jul 21, 2000May 15, 2007Philip Morris Usa Inc.Cigarette paper with ammonium compound reduces aldehydes in tobacco smoke;
EP1215972A1 *Jul 21, 2000Jun 26, 2002Philip Morris Products Inc.Smoking article wrapper with improved filler
Classifications
U.S. Classification131/365
Cooperative ClassificationD21H5/16
European ClassificationD21H5/16