Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1991-07-10
1992-10-13
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
156336, 131 35, 131 37, 131105, 131284, 131343, 131345, C09J10514, A24C 524
Patent
active
051551403
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the use of adhesive mixtures containing--per 100 parts by weight water--40 to 120 parts gum arabic 3 to 80 parts by weight water-soluble starch degradation products and/or carboxymethyl starch and/or gelatinized starch and, optionally, typical preservatives in aqueous solution and having a Brookfield (RVT) viscosity at 20.degree. C. in the range from 1,000 to 15,000 and more especially in the range from 2,000 to 5,000 mPa.s for glueing the longitudinal seam of cigarette tubes by machine.
For glueing the longitudinal seam of cigarette tubes by machine, there is a need for adhesives of natural raw materials to replace the dispersion glues used hitherto. Thus, DE-C 2 619 708 describes a gelatine-based adhesive mixture which, unfortunately, does not satisfy all the requirements of an adhesive for glueing longitudinal seams by machine using the nozzle application systems typically used in the cigarette industry. In terms of structure, the adhesive mixtures mentioned lie between aqueous systems and hotmelts and have to be applied to the paper to be glued from heated apparatus. However, as with all adhesives based on animal proteins, heating in particular involves the danger of decomposition with emission of unpleasant odors.
It is also known that adhesive mixtures in which one component consists of gum arabic may be used for the binding of paints, paper, and books. For example, in DE 626,010 an adhesive mixture consisting of 10 g crude rubber, 75 g gum arabic, 5 g sodium sulfate, 50 g starch, and 50 g waterglass in a total of 1200 g lime water is described (see Claim). The solution can also be diluted with water (see line 30). The adhesive mixture is used for gluing paper, metal, glass, porcelain, celluloid, fabrics, leather, and other materials, especially for gumming sheets of stamps (see lines 20 to 32).
From Chemical Abstracts, Vol. 96, 1982, p. 106, No. 8737h, an adhesive for bookbinding is known which consists of starch and 0.1-300% dextrin, gum arabic, or sodium silicate.
French Patent 408,254 pertains to the production of adhesive powder. It consists of 50% gum arabic, 5% wheat flour, 2% gum tragacanth, 5% dextrin, 15% sugar, and 3% magnesium sulfate. This powder is intended for use as a binder for paints and books as well as for the fixing of glass, sheet tin, and metals.
Accordingly, the present invention relates to the use of special adhesive mixtures which enable the longitudinal seams of cigarette tubes to be safely and permanently glued using the machines normally used in the cigarette industry, particularly taking the high production rates required in that industry into account, and which show no tendency to decompose with emission of unpleasant odors and do not require heated apparatus for application.
This problem is solved by the use of the above-mentioned adhesive mixtures based on gum arabic.
The types of gum arabic suitable for use in accordance with the invention should be of prime quality, for example so-called hand-picked types.
The water-soluble starch degradation products suitable for use in accordance with the invention include oxidatively or hydrolytically degraded starches and dextrins (roasted dextrins), particularly white and yellow dextrins, of the type described for example, in Ullmanns Enzyklopadie der Technischen Chemie, 4th Edition, Vol. 22, pages 191-194, Verlag Chemic Weinheim (1982). Generally speaking, thick-boiling dextrins are preferred. Typical representatives of these dextrins are 20.degree. C. in the range from 1,000 to 8,000, as measured on a freshly prepared 60% solution, C. in the range from 500 to 2,000, as measured on a freshly prepared 50% solution, range from 100 to 1,000 mPa.s, as measured on a freshly prepared 40% solution.
The dextrins mentioned above are all commercially available.
Carboxymethyl starches suitable for use in accordance with the invention are any of the commercially available types used in the adhesive industry.
Gelatinized starches suitable for use in accordance with the invention are potato, corn, tapioca and/or ri
REFERENCES:
patent: 3625225 (1971-12-01), Halter
patent: 4175996 (1979-11-01), Battard et al.
patent: 4936920 (1990-06-01), Keritsis et al.
Buxhofer Horst
Huehne Johannes
Marten Klaus
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Nutter Nathan M.
Szoke Ernest G.
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