Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1994-04-08
1995-11-07
Lusignan, Michael
Coating processes
With post-treatment of coating or coating material
Heating or drying
81281, 19115R, 428291, B05D 302
Patent
active
054646600
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the use of compounds, having solidification points above 25.degree. C., selected from the group of dialkyl esters containing two identical or different hydrocarbon radicals, carboxylic acid esters of monocarboxylic and/or dicarboxylic acids and aliphatic monohydric alcohols and esters of dihydric, trihydric and/or tetrahydric alcohols and aliphatic monocarboxylic acids as smoothing agents in combing oils for the production of combed slivers of wool and to a process for smoothing wool in the production of combed slivers using compounds selected from the above-mentioned group with solidification points above 25.degree. C.
STATEMENT OF RELATED ART
Before spinning, wool which is to be processed into combed slivers has to be intensively washed to remove inorganic fiber soils, such as sand, dust and suint salts, and organic fiber soils, such as straw, food remains, wool grease and perspiration. Removal of the fiber soils and particularly the removal of wool wax and wool grease alters the static and dynamic frictional characteristics of the wool to a considerable extent, so that subsequent processing of the wool becomes extremely problematical, particularly where intensive fiber/fiber and fiber/metal friction occurs. The wool fibers are heavily stressed above all during the carding process, in which a sliver (combed sliver) is produced by parallelizing and fine opening. This stressing often leads to electrostatic charging and to a reduction in the mean staple length of the wool and also to an increase in the combing waste. To counteract electrostatic charging, reductions in the mean staple length and combing waste, the wool has to be treated with combing oils after washing and before carding. Smoothing agents liquid at 20.degree. to 25.degree. C. (room temperature), such as olive oil, peanut oil, olein, fats, fatty acid esters and mineral oils of various kinds, are normally used in combination with emulsifiers as the combing oils (cf. Handbuch fur Textilingenieure und Textilpraktiker [English translation of title: Handbook for Textile Engineering and Textile Practice], edited by Prof. E. Wagner, 2nd Edition (Oskar-Spohr-Verlag, Frankfurt am Main, 1974), pages 47 et seq. and Textil praxis international [English translation of title: International Textile Practice], Vol. 45, (Konradin Verlag, Leinfelden, October 1990), Article by W. Becker, pages 1035-1038. In the context of the invention, therefore, combing oils are understood to be a mixture of smoothing agents and emulsifiers.
Although these liquid combing oils are capable of favorably influencing the reduction in mean staple length, combing waste and the electrostatic effect, there is still a need for combing oils which have improved effects. Thus, the carding rate can be increased by reducing electrostatic charging, while product quality can be increased by counteracting the reduction in mean staple length, which is of considerable economic value to manufacturers of combed slivers.
DE-A-37 06 362 describes dialkyl ether compounds containing identical or different saturated and/or unsaturated hydrocarbon radicals containing 6 to 24 carbon atoms. These dialkyl ether compounds may be applied as smoothing agents to textile fibers of various kinds, inter alia in the form of dispersions, in order to reduce fiber/metal friction. Although wool is among the textile fiber materials mentioned in the document in question, there is no reference to the fact that the reduction of mean staple length, combing waste and electrostatic charging are improved by treatment with dialkyl ethers having solidification points above 25.degree. C.
DE-A-26 21 881 describes a mixture of fatty acid esters of C.sub.14-18 fatty acids and monohydric C.sub.1-8 alcohols, paraffins melting at 40.degree. to 60.degree. C. and fatty acid amidopolyamines as a smoothing agent. Smoothing agents of this type provide textile fiber materials, including wool, that are treated with the smoothing agents with the smoothness required for subsequent processing.
REFERENCES:
patent: 2212369 (1940-08-01), Jaeger
patent: 3628908 (1971-12-01), Goldberg et al.
patent: 3628909 (1991-12-01), Goldberg et al.
patent: 4122018 (1978-10-01), Waltenberger
Handbuch fur Textlingenieure und Textilpra ktier, herausegegen von Prof. E. Wagner, 2. Auflage, 1974, Oskar-Spohr-Verlag, Frankfurt am Main, S 47 ff.
Textil praxis international, 45, Jg. Konradin Verlag, Leinfelden, Oct. 1990, Aufsatz von W. Becker, S. 1035-1038.
Rompps Chemie-Lexikon, 8. Aufl. Band 5, S. 3727 f, Stuttgart 1987.
Ullmann's Enzyklopadie der technischen Chemie, 4. Auflage, Band 8, 1974, S. 146-156, Verlg Chemie, Weinheim.
Becker Wolfgang
Hoffmann Rainer
Kiray Yasar C.
Mathis Raymond
Robrahn Karin
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Lusignan Michael
Szoke Ernest G.
Wisdom, Jr. Norvell E.
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