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Lightfast and high shrinkage temperature leather produced using vegetable tannins and novel melamine-urea-formaldehyde tanning formulations / C. Simon in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 3 (03/2003) . - p. 83-96 Titre : Lightfast and high shrinkage temperature leather produced using vegetable tannins and novel melamine-urea-formaldehyde tanning formulations Type de document : texte imprimé Auteurs : C. Simon, Auteur ; Antonio Pizzi, Auteur Année de publication : 2003 Article en page(s) : p. 83-96 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new sulphonated melamine-urea-formaldehyde (MUF) resin of relatively low melamine content, prepared according to a sequential procedure, has been shown to be highly effective when coupled with different natural vegetable tannins to produce leather with the same good characteristics of leather prepared with chrome salts. In particular the shrinkage temperature of the leather prepared according to the new approach is comparable to that obtained with chrome-tanned leathers. Leathers produced using tanning formulations based on the combination of this MUF resin with either flavonoid (condensed: mimosa or quebracho) tannins and hydrolysable ellagitannins (chestnut) have shown good colour stability. Leathers prepared with Chestnut or Mimosa combined with MUF tannage in 50/50 and in 75/25 weight ratios exhibited the most promising physical properties. Furthermore, there are a number of other formulations to choose from which are capable to overcome the major drawback of vegetable tanning in relation to chromium tanning. En ligne : https://drive.google.com/file/d/1HVqKjbFSD3OdFB_BbD4ekOjtoccFxOGG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4096 [article]

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Properties distinguishing acrylic polymers as binders for basecoats on leather / Fred Schindler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 3 (03/2003) . - p. 97-100 Titre : Properties distinguishing acrylic polymers as binders for basecoats on leather Type de document : texte imprimé Auteurs : Fred Schindler, Auteur Année de publication : 2003 Article en page(s) : p. 97-100 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Acrylic emulsion polymers share properties that make them a preferred class of binders for basecoats. These common properties can be modified by compositional and process features that distinguish them, providing different combinations of applications properties such as fill, tack, embossing, and flex endurance. New polymer synthesis technology has provided superior combinations of (a) good dry flex endurance with low tack, and (b) good flow under the embossing plate with freedom from sticking and cutting. A further development is a new self-crosslinking chemistry that provides improved wet flex endurance and wet intercoat adhesion. En ligne : https://drive.google.com/file/d/13cYAG6Mc07XxI27DMwzHnuTsLCte_LtS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4097 [article]

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Studies on tanning with zirconium oxychloride : Part I. Standardization of tanning process / A. Sundarrajan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 3 (03/2003) . - p. 101-106 Titre : Studies on tanning with zirconium oxychloride : Part I. Standardization of tanning process Type de document : texte imprimé Auteurs : A. Sundarrajan, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2003 Article en page(s) : p. 101-106 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Concern over environmental toxicology and demand for safe disposal of process wastes are topics of current interest. Although chromium(III) salts find extensive usage in leather processing, the environmental concerns of the leather industry for chromium pollution has led to search for alternative tanning agents. Zirconium salts seem to have the potential for their long-term sustenance in tanning processes. There are several reports on the use of sulphate salts of zirconium in tanning, but the associated disadvantages are poor solubility, drawn grain etc., which have limited their use as a tanning salt. Hence, exploration of other zirconium salts, like zirconium oxychloride as tanning agent is essential. The present investigation focuses on the development of a tanning system using zirconium oxychloride by proper ligation. Zirconium oxychloride with different ligating environments have been employed for tanning experiments. Hydrothermal stability of leathers as high as 95°C has been obtained. Citric acid has been found to be a better ligand, which produces leathers with high hydrothermal stability as compared to other ligands. The precipitation point of zirconium oxychloride solutions with and without citric acid masking has been determined. The amount of tanning salt and ligand used have also been standardized to obtain leathers with properties comparable to those of conventional chrome-tanned leather. En ligne : https://drive.google.com/file/d/1ULqGhdng4hGmlruZEYEhk8bF0366caBC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4098 [article]

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Studies on tanning with zirconium oxychloride : Part II. Development of a versatile tanning system / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 3 (03/2003) . - p. 107-114 Titre : Studies on tanning with zirconium oxychloride : Part II. Development of a versatile tanning system Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; A. Sundarrajan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2003 Article en page(s) : p. 107-114 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Zirconium oxychloride, with suitable ligand environment has been found to be an effective tanning agent. Hydrothermal stability of about 95°C was obtained for the leathers treated with zirconium oxychloride masked with citric acid. The present investigation focuses on possible methodologies to improve the properties of leathers obtained from zirconium oxychloride tanning to suit different product mix through treatment with various co-tanning adjuncts. Exhaustion of zirconium was found to be greater than 80% in all tanning experiments. The zirconium oxychloride leathers posttanned without neutralization exhibit better organoleptic properties compared to leathers posttanned after neutralization. The post-tanning operations have been optimised to obtain both upper and garment leathers. Treatment of zirconium oxychloride leathers with silica produced fuller and smooth grained upper leathers whereas, pretreatment with gluteraldehyde resulted in soft garment leathers. Properties of the leathers obtained are on par with the conventional chrome tanned leathers. Thus a tanning system based on zirconium oxychloride has the potential to be as versatile as chrome tanning systems, which produce leathers for different end uses. En ligne : https://drive.google.com/file/d/1zSSoGgY78awWdhZoLLlDB1xGysSHiXTP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4099 [article]

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