A new way to control gloss / Jerry Levy in WORLD LEATHER, Vol. 14, N° 4 (06-07/2001)  

[article]  inWORLD LEATHER > Vol. 14, N° 4 (06-07/2001) . - p. 53-58 Titre : A new way to control gloss Type de document : texte imprimé Auteurs : Jerry Levy, Auteur ; Jon W. Bouchard, Auteur Année de publication : 2001 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) -- Mesure Couches minces Cuirs et peaux -- Finition Polymères Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather finishing today calls for coatings with high adhesion, abrasion resistance and flexibility. When an extremely low level of gloss is required, the finish is usually loaded with dulling agents, while accepting that this can detract from both mechanical properties and adhesion. Gloss level control is very important. With the exception of pattents and other very bright leathers where the gloss target is set as high as practicable, ordinary finishes are too bright without at least some dulling. Note de contenu : - Low gloss finishes without dulling - New film-forming polymer chemistry - Film morphology - Film formation - The mechanism of gloss control - Fig. 1 : Gloss measurement geometry defined angles are measured with respect to the perpendicular - Fig. 2 : Surface view, conventional low-gloss coating, silica matting agent (x2500 as viewed) - Fig. 3 : Surface view, conventional low-gloss coating, organic matting agent (x2500 as viewed) - Fig. 4 : Surface view, film cast from new low-gloss polymer (x1000 as viewed) - Fig. 5 : Surface view, film cast from new low-gloss polymer (x1000 as viewed) - Fig. 6 : Surface view, film cast from new low-gloss polymer (x5000 as viewed) - Fig. 7,8,9 : Cross sections of polymer cast on Leneta Chart and freeze-fractured to reveal cross-section - Fig. 10 : Schematic comparison refraction : light incident on a spherical surface compared with a smooth, flat surface and the effects of tilting the plane of the coating. Reflections at specular angle (shown as the dotted line) are important only for the flat surface - Fig. 11 : Multiple ray traces: light incident on sphere with interfaces of air (η1 = 1.0) and polymer (η2 = 1.5) - Fig. 12 : Plot of reflection off a spherical surface. Imagine a bundle of parallel incident rays coming from the top, striking the spherical surface (dotted arc) as shown and either being refracted into the sphere or reflected off it. Squares represent a plot of calculated percents of incident light reflected. The table lists several of the calculated values plotted in Figure 12 En ligne : https://drive.google.com/file/d/1Z6xXbTZIqrLT7lgvCzO9eo5F0Qjbb8mU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32159 [article]

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Novel water-based urethanes in leather finishing / Jon W. Bouchard in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 191 - 196 Titre : Novel water-based urethanes in leather finishing Type de document : texte imprimé Auteurs : Jon W. Bouchard, Auteur Année de publication : 1986 Article en page(s) : p. 191 - 196 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The first urethane resins or aqueous emulsions were prepared using relatively conventional emulsification techniques. Solvent-containing prepolymers (having free isocyanate groups) or fully reacted polymers were emulsified using proprietary surfactants. In this process, mechanical equipment that would provide the necessary shear to prepare a fine particle size system was necessary. The later types of urethane emulsions are solvent free. By incorporating emulsifying groups into the prepolymer backbone, it is possible to prepare emulsions using conventional mixing equipment. The chemistry of these products is reviewed. Their properties compared to conventional finishing systems for basecoats and topcoats are described. En ligne : https://drive.google.com/file/d/119S5vUo72rNnwJWd41WkYyd4SPgEPvgc/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9172 [article]

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