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Photosensitive polymers / Shilpi Sanghi in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 37-50 Titre : Photosensitive polymers Type de document : texte imprimé Auteurs : Shilpi Sanghi, Auteur ; Atri Rungta, Auteur Année de publication : 2005 Article en page(s) : p. 37-50 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Photoresists are photosensitive polymers undergoing a change in chemical solubility on exposure to UV light. In positive photo resists, UV light exposure leads to scission and increases the solubility (e.g. Novolak) whilein negative photo resists it leads to cross linking of exposed areas thereby decreasing the solubility. Most of negative photo resists are based on cinnamatic derivatives of polymers having hydroxyl groups. Use of appropriate photosensitizers augments the photo resist property. In chemically amplified two or three component based photo resists, Photo acid generator (PAG) is used which acts as a catalyst. Polymers with pendant carboxyl groups with PAG give a negative tone photo resist. Copolymer containing (+) Bornyl Methacrylate and their Racemate is used as +ve tone photoresist. Substituted DOS and MNDDS resin form a positive photoresist. Photoresists are extensively used in lithographic applications. They are used for fabrication of solid devices to protect the underlying substrate for variety of purposes. Offset lithographic printing is used extensively. Various resins used for this process are discussed. Note de contenu : - Photoresist polymers - Negative photoresist - Chemical amplification - Polymers with pendant carboxyl group - Copolymers containing (+)-bornyl methacrylate and their racemate used as positive tome photoresist - Derivative of diphenylamine-4-diazonium salt (DDS) and resin (DDS resin) as negative photoresist - Offset lithographic printing - The offset lithographic process - Principle of offset printing - Resins - Natural resins - Rosin - Synthetic resins - Alkyd resins - Polystyrene resins and copolymers - Silicne resins - Hydrocarbon resins Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11645 [article]

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Development of a low cost environmentally cleaner process for anatase and rutile phase titanium dioxide particles / G.D. Surender in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 51-66 Titre : Development of a low cost environmentally cleaner process for anatase and rutile phase titanium dioxide particles Type de document : texte imprimé Auteurs : G.D. Surender, Auteur Année de publication : 2005 Article en page(s) : p. 51-66 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : dian paint industry has established itself as a major contributor to India's wealth and employment creation as well as producing value added goods and services to society at large. In order to achieve sustainability and global competitiveness, there is a pressing need to reduce the manufacturing costs and enhance its product performance through innovation in the manufacture of titanium dioxide with low costs, environmental acceptance and from the vast indigenous resource of ilmenite mineral. This paper highlights a novel process to achieve low cost production of both anatase and rutile phase TiO2 in a single flexible process through the applications of a novel process employing the vapour phase hydrolysis of titanium chloride. Rutile grade titanium dioxide is obtained through the use of an organic dopant at low temperature. Very significant cost advantages is perceived due to the much lower temperatures of operation and the use of water vapour instead of pure oxygen as in the existing chloride process. With a view to interpret and understand the relationship between titanium dioxide particle characteristics and the process conditions, a new mechanism of nucleation and particle growth has been proposed and the model is validated with the experimental results. The comprehensive nature of the work involving novel experimental work, an innovative process and a knowledge based quantitative interpretations of the results is expected to establish a firm foundation to demonstrate the process at larger scales, leading to an enormous impact on the paint industry. Note de contenu : - Crucial role of titanium dioxide in paint industry - Synthesis of anatase phase titanium dioxide particles through a low temperature (<387K) vapour phase hydrolysis of titanium tetrachloride - Experimental procedure - Characterization of titania powders - Result and discussion - Effect of process conditions on the TiO2 powder produced at a reaction temperature of 353K - Effect of process conditions on the TiO2 powder produced at a reaction temperature of 387K - Synthesis of rutile phase titanium dioxide particles through a novel low temperature (<673K) vapour phase hydrolysis of titanium tetrachloride - Experimental procedure and characterization - Justification for less energy consumption - Critical process step in the invention - Scientific basis of invention - Marketable products which could he produced by the use of the innovation - Interpretation of the relationship between titanium dioxide particles and process conditions through mechanistic and computer aided process modeling - Effect of hydrolysis temperature on average particle size - Effect of TiCl4 concentration and H2O/TiCl4 molar ratio on average particle size Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11646 [article]

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Dehumidification for ballast tank coatings / Jagdeep Singh in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 67-72 Titre : Dehumidification for ballast tank coatings Type de document : texte imprimé Auteurs : Jagdeep Singh, Auteur Année de publication : 2005 Article en page(s) : p. 67-72 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Ship ballast tanks present themselves to very corrosive exposures. The paper briefly outlines the nature of corrosion in ballast tanks,concepts of corrosion and supports application of Protective Coatings as an effectivetool for preventing it. Explaining the effect of high humidity while preparing the surface for coating, the need to control the moisture level of the surrounding air to prevent premature coating failure is identified. The paper proposes the use of dehumidifiers for removing moisture from air while preparing and coating the surface for improved coating performance. Note de contenu : - Ballast tanks - Anti-corrosive paint systems for ballast tanks - Surface preparation - Dehumidification-an aid to proper surface preparation - Dehumidification systems for ballast tank coatings - Types of dehumidification - Benefits of dehumidification Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11647 [article]

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Lasting colour for high performance coatings / James P. White in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 75-79 Titre : Lasting colour for high performance coatings Type de document : texte imprimé Auteurs : James P. White, Auteur Année de publication : 2005 Article en page(s) : p. 75-79 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Organic pigment - Complex inorganic colour pigment Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11648 [article]

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Foam control additives / S. C. Jain in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 81-86 Titre : Foam control additives Type de document : texte imprimé Auteurs : S. C. Jain, Auteur Année de publication : 2005 Article en page(s) : p. 81-86 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Foam formation - Composition of foam control additives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11649 [article]

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Nanotechnology-new avenues in coatings / Bharat Thakkar in PAINTINDIA, Vol. LV, N° 7 (07/2005)

[article]  inPAINTINDIA > Vol. LV, N° 7 (07/2005) . - p. 87-88 Titre : Nanotechnology-new avenues in coatings Type de document : texte imprimé Auteurs : Bharat Thakkar, Auteur Année de publication : 2005 Article en page(s) : p. 87-88 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - What is nanotechnology - How nanotechnology employed into coatings - Avenues for coating based on nanotechnology Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11650 [article]

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