A comparison of Indonesian and Indian shellacs using specular reflectance spectroscopy / Deepika Bhatia in PAINTINDIA, Vol. LVII, N° 7 (07/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 7 (07/2007) . - p. 87-94 Titre : A comparison of Indonesian and Indian shellacs using specular reflectance spectroscopy Type de document : texte imprimé Auteurs : Deepika Bhatia, Auteur ; P. C. Sarkar, Auteur ; M. Alam, Auteur Année de publication : 2007 Article en page(s) : p. 87-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fourier, Spectroscopie infrarouge à transformée de Gomme-laque Réflexion totale atténuée Spectroscopie de réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : Fourier Transform Infrared (FTIR) spectroscopy is well established as an analytical tool, for the determination of different functional moieties in complex matrices, including polymers and resins, both natural and synthetic. In addition to conventional KBr sampling techniques, DRIFT (Diffuse Reflectance), ATR (Attenuated Total Reflectance) and Specular Reflectance (SRS) techniques are also associated with FTIR. Specular Reflectance spectroscopy is useful in compounds having amorphous structures, as well as substances, which cannot be ground to a fine powder for KBr sampling. Such materials are therefore cast as films on reflecting surfaces and the reflectance spectra of the films are obtained, which may have to be converted to easily recognizable, transmission-type spectra, through sophisticated computerized techniques. In the present work, specular reflectance spectroscopy was utilized to ascertain molecular level differences in functional moieties of lac resin, obtained from different sources. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11496 [article]

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LAC : its chemistry and applications in the new millennium / P. C. Sarkar in PAINTINDIA, Vol. LVI, N° 1, Sup (01/2006)

[article]  inPAINTINDIA > Vol. LVI, N° 1, Sup (01/2006) . - p. 155-160 Titre : LAC : its chemistry and applications in the new millennium Type de document : texte imprimé Auteurs : P. C. Sarkar, Auteur Année de publication : 2006 Article en page(s) : p. 155-160 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : Introduction Production and processing Chemistry lac Safety aspects and applications The future Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11549 [article]

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Shellac-based tin can lacquers for the packaging industry / P. C. Sarkar in PAINTINDIA, Vol. LII, N° 3 (03/2002)

[article]  inPAINTINDIA > Vol. LII, N° 3 (03/2002) . - p. 41-44 Titre : Shellac-based tin can lacquers for the packaging industry Type de document : texte imprimé Auteurs : P. C. Sarkar, Auteur ; P. C. Gupta, Auteur Année de publication : 2002 Article en page(s) : p. 41-44 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The suitability of shellac-based compositions as internal can coating lacquers was studied for possible use by the packaging industry. Several formulations based on shellac and different, commercially available synthetic thermosetting resins, including urea formaldehyde, melamine formaldehyde, phenol formaldehyde (resole type) and polyvinyl butyral resin, etc. were evaluated as per IS: 5818 (1988) specifications. All formulations were based in a spiritless solvent medium. It was observed that certain formulations showed good potential for use as can coating lacquers and, if adopted by the can coating industry, were likely to give a boost to the consumption of lac resin in this virgin field, both in India as well as abroad. Note de contenu : - Quality control - Shellac in metal lacquering - Present work - Conclusions and future perspectives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12332 [article]

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