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Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis / Nishant N. Prabhu in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 33-46 Titre : Low molecular weight acrylic resins through change in the mode of initiator addition : a novel route of synthesis Type de document : texte imprimé Auteurs : Nishant N. Prabhu, Auteur ; C. Suryanarayana, Auteur Année de publication : 2003 Article en page(s) : p. 33-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : High temperature processing, higher initiator dose, use of chain transfer agent and slower monomer addition are the commonly used techniques for getting low molecular weight acrylic resin in drip-feed process. An alternate route was evaluated wherein the initiator was added in the reactor either partly or completely prior to monomer addition. Nine different resins with same monomer compositions were synthesized, one resin as a control, four resins by using each of the above four routes for getting lower molecular weight than control and four by adding part or whole of the initiator in the reactor. The viscosity, percent solids, molecular weight distribution and free monomer content of these acrylic resins and the properties of the film obtained by curing these resins with an amino resin were compared. For initiator having higher half life at the processing temperature, the new route gave resin with lowest viscosity when all the initiator was added in the reactor. The performance of this resin was found comparable to the resins of similar molecular weight obtained by using the other available routes. The study showed that in case of initiator having lower half life at the processing temperature, optimization of ratio of splitting the initiator between reactor and initiator mix is required. Note de contenu : - Characterization of the acrylic resins – Paint processing and characterization – Crosslinking and characterization of coating films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12161 [article]

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The development of nonblooming polyester resin and its application to low temperature curing powder coatings / Navin B. Shah in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 47-56 Titre : The development of nonblooming polyester resin and its application to low temperature curing powder coatings Type de document : texte imprimé Auteurs : Navin B. Shah, Auteur ; Edward G. Nicholl, Auteur Année de publication : 2003 Article en page(s) : p. 47-56 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Low temperature curing powder coatings are receiving increasing attention in the coatings inudstry, to conserve energy and also for heat sensitive substrates. Resin combinations commonly used in powder coatings (poly-ester/TGIC, polyester/Bis-phenol A epoxy, polyester/Bis-(N,N'-dihydroxy) adipamide), display an undesirable phenomenon called "blooming", under specific cure conditions. An understanding of this phenomenon and the probability of the formation of macrocyclic structures , responsible to cause blooming in various polyesters has been provided. The development of a nonblooming polyester resin in which a portion of the neopentyl glycol (NPG) has been substituted with 2-butyl-2-ethyl-1,3-propane diol (BEPD:US Patent 5,880,223, Morton International) is presented. THe use of amorphous nonblooming polyester resin in combination with semicrystalline polyester for low temperature curing powder coatings has been described. Note de contenu : - The development of a nonblooming polyester resin - Low temperature curing powder coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12166 [article]

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Hybrid polymer sealants-minerals for performance enhancement / Anthony Asbridge in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 57-62 Titre : Hybrid polymer sealants-minerals for performance enhancement Type de document : texte imprimé Auteurs : Anthony Asbridge, Auteur ; David Preston, Auteur ; Erik van Dijnen, Auteur Année de publication : 2003 Article en page(s) : p. 57-62 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Sealants based on hybrid polymers such as silyl-terminated polyethers combine good weathering characteristics, paintability and stain resistance, and excellent adhesion to a wide range of substrates. In silyl-terminated polyether sealants the mineral component can represent over 50% of the mass of the sealant. The choice of mineral will therefore have an impact on the processing and ultimate performance of the sealant. This paper evaluates the performance of minerals in such sealants. Specifically, the effects of coated ground calcium carbonates on sealant stability, rheology and curing and hardened tensile properties are reported. The potential impacts on the sealant process routes are discussed in parallel. The results demonstrate that sealant production processes can be simplified and sealant properties improved through selection and control of the physical properties of the mineral component. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12167 [article]

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Polymeric and inorganic microspheres and ther applications. / Rama Dubey in PAINTINDIA, Vol. LIII, N° 8 (08/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 8 (08/2003) . - p. 63-66 Titre : Polymeric and inorganic microspheres and ther applications. Type de document : texte imprimé Auteurs : Rama Dubey, Auteur ; D. Lal, Auteur ; G. N. Mathur, Auteur Année de publication : 2003 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Recently hollow spheres of nanometer to micrometer dimensions called microspheres form a new and important class of shape fabricated materials. The most important advantage with microspheres is that its shell can be constructed from a variety of materials of valuable scientific interest and technological importance. These include magnetic, semiconducting, ceramic, metallic, biomolecular, polymeric and composite materials. As a result microspheres find wide application in chemistry, physics, biology, medicine and other science disciplines, as controlled release capsules (drugs, dyes, cosmetics and inks), artificial cells, catalysts, fillers, supports, abrasives, ball point pen tips, composites, thermal insulation, electrical circuit boards, chromatography, shock absorbing armour plate, gas or chemical storage and in electromagnetic (EM) wave absorbing coatings. Note de contenu : - What are microspheres - Applications and advantages - Obstacles still to overcome Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12168 [article]

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