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Titre : Novel curing : An emerging technology may allow adhesives in opaque substrates to be cured by UV or visible light Type de document : texte imprimé Auteurs : dave Bunn, Auteur Année de publication : 2012 Article en page(s) : p. 37-38 Langues : Américain (ame) Catégories : Colles:Adhésifs
Lumière visible
Luminescence
Particules (matières)
Rayonnement ultraviolet
Réticulation (polymérisation)Tags : Adhésifs Réticulation 'Lumière visible' 'Rayonnement ultraviolet' 'Matériaux opaques' 'Générateur lumière activé rayon X' 'Particules luminescentes' 'modulateur énergie' Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Adhesives and coatings cured by ultraviolet (UV) or visible light have become valuable tools in modern-day assembly operations, particularly in high-technology industries such as electronics and medical devices. Most UV adhesives are based on free radical polymerization systems with acrylate or methacrylate monomers, although other systems such as cationically cured cycloaliphatic epoxies, vinyl ethers, and oxetanes are known.
- UV systems offer users the following advantages:
- Quick cure speed (often in seconds) leads to increased productivity
- Energy savings; requires a fraction of the power consumption of heat curing
- Fewer stresses and movement than in heat cure
- Less floor space due to small, compact curing systems
- Single component (no application of primers or mixing)
- Reduced work in process (assembly to pack measured in minutes)
- Safety (no hazardous solvents or other emissions)En ligne : http://www.adhesivesmag.com/articles/print/91089-novel-curing Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19029
in ADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 6 (06/2012) . - p. 37-38[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13948 - Périodique Bibliothèque principale Documentaires Disponible Down regulation of nuclear factor-kappaB activation in human keratinocytes by melanogenesis inhibitors / Kwang Seok Ahn in IFSCC MAGAZINE, Vol. 7, N° 1 (01-02-03/2004)
[article]
Titre : Down regulation of nuclear factor-kappaB activation in human keratinocytes by melanogenesis inhibitors Type de document : texte imprimé Auteurs : Kwang Seok Ahn, Auteur ; Jinseon Lee, Auteur ; Yeong Shik Kim, Auteur Année de publication : 2004 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Kératinocyte 'Inhibiteurs de la mélanogenèse' 'Activité NK-?B' 'Cellules transfectantes' 'Lumière ultraviolette B' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Liberated nuclear factor-kappaB (NF-κB) is translocated into the nucleus where it can change or alter the expression of target genes, resulting in the secretion of extracellular signaling molecules including melanotrophic factors affecting the melanocyte. In order to demonstrate the possible role of NF-κB activation on the synthesis of melanotrophic factors from the keratinocytes, the activities of NF-κB induced by melanogenesis inhibitors were determined in human HaCaT keratinocytes transfected with pNF-κB-SEAP-NPT plasmid. Transfectant cells released the secretory alkaline phosphatase (SEAP) as a transcription reporter in response to the NF-kB activity. Melanogenesis inhibitors such as niacinamide, kojic acid, hydroquinone, resorcinol, arbutin and glycolic acid were pre-incubated with transfectant HaCaT cells for 3 h and then irradiated with ultraviolet B (UVB). Of the melanogenesis inhibitors tested, kojic acid (IC50 = 60 μM) was found to be the most potent inhibitor of UVB-upregulating NF-κB activation in transfectant HaCaT cells, which is followed by niacinamide (IC50 = 540 μM). Especially kojic acid and niacinamide effectively lowered NF-κB binding as measured by the electrophoretic mobility shift assay. Furthermore, these two inhibitors remarkably reduced the secretion level of IL (interleukin)-6, one of the melanotrophic factors, triggered by UV radiation of the HaCaT cells. These observations suggest that melanogenesis inhibitors working at the in vivo level might act partially through the modulation of the synthesis of melanotrophic factors in keratinocytes. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10544
in IFSCC MAGAZINE > Vol. 7, N° 1 (01-02-03/2004) . - p. 39-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003882 - Périodique Bibliothèque principale Documentaires Disponible