Allylic alcohols improve acrylic polyols / Daniel B. Pourreau in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/2004 (11/2004)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11/2004 (11/2004) . - p. 22-31 Titre : Allylic alcohols improve acrylic polyols Type de document : texte imprimé Auteurs : Daniel B. Pourreau, Auteur ; Wei Wang, Auteur ; Ronald H. Blackwell, Auteur ; Stephen Harris, Auteur Année de publication : 2004 Article en page(s) : p. 22-31 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Low VOC components - Efforts to reduce the VOC content of two-component urethane coatings have focused primarely on lowering the molecular weight of the polyols. Unfortunatly, the OH fonctionnality of conventionnal polyols decreased linearly with molecular weight. With that, the crosslinkingability of the polyol and the performance of the coating also decrease. This inherant limitation has been overcome by developing a new class of acrylic polyols based on allylic alcohols. En ligne : https://drive.google.com/file/d/1Zb29CR3taQa91hTnnlmq45jE3F4KJCxe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9127 [article]

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Better resin management / Shao-Hua Guo in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 24-27 Titre : Better resin management Type de document : texte imprimé Auteurs : Shao-Hua Guo, Auteur ; Wei Wang, Auteur ; Stephen H. Harris, Auteur ; Shanty Patel, Auteur ; L. Joseph Junker, Auteur ; Ronald S. Blackwell, Auteur ; Farhad Faddakar, Auteur ; Daniel B. Pourreau, Auteur Année de publication : 2002 Article en page(s) : p. 24-27 Langues : Anglais (eng) Catégories : Acrylates hydroxy-fonctionnels Automobiles -- Revêtements:Automobiles -- Peinture Copolymère uréthane acrylique Durée de vie en pot Formulation (Génie chimique) Groupe allyle Polyhydroxyéthyle acétate Polyméthacrylate d'hydroxyéthyle Polyols Revêtements bi-composant:Peinture bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : The evolution in the approach for developing low-VOC coatings is examined. Acrylic two-component (2K) urethane technology has undergone a gradual evolution over the past twenty years. Incremental changes in acrylic polyols and isocyanate crosslinkers have been, for the most part, driven by lower VOC content limits and increased performance requirements. However, the basic chemistry of acrylic polyols has not substantially changed over that time period. Almost every acrylic polyol on the market today is obtained by free-radical polymerisation of acrylate and methacrylate esters and styrene. Hydroxyl functionality is introduced by adding hydro-functional acrylates (HFAs) to the monomer blend. Note de contenu : - Lower VOCs hits performance - The resin management concept - End-use versatility - Improving control - Resin management at work - Pot life - Overall benefits - FIGURES : 1. Hydroxy-functional acrylates (HFA) used in conventional polyols - 2. HFA polyols have greater variation of functionality with weight - 3. Allylic monomers used in the latest acrylic polyols - 4. Comparison of HEMA-based and AP1.0-based polyols - TABLE : White pigmented 2K urethane formulations from hard and soft blends and commercial acrylic polyols Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28083 [article]

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High-solids alkyds resins with improved properties based on styrene allyl alcohol (SAA) resinous polyols / Daniel B. Pourreau in COATINGS TECH, Vol. 1, N° 2 (02/2004)  

[article]  inCOATINGS TECH > Vol. 1, N° 2 (02/2004) . - p. 40-47 Titre : High-solids alkyds resins with improved properties based on styrene allyl alcohol (SAA) resinous polyols Type de document : texte imprimé Auteurs : Daniel B. Pourreau, Auteur ; Scott E. Smyth, Auteur Année de publication : 2004 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool styrène allylique Haut extrait sec Polyalkydes Polyols Réduction des composés organiques volatils Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Stringent VOC content rules on Architectural and Industrial Maintenance (AIM) coatings have recently been enacted by federal, regional, and state regulatory agencies. These new rules effectively ban the use of low-solids solventborne alkyd resins, despite their excellent properties, ease of use, and low cost. In response to these new regulations, alkyd producers have been developing higher solids and waterborne alkyds, but these new resins do not perform as well and are more costly than the higher VOC versions. High solids alkyd resins typically have lower molecular weights, which can increase their drying times and reduce their durability. Waterborne alkyds are usually more expensive, despite having lower solids contents. Their dry time is also affected by temperature and humidity and their storage stability is usually lower than solution alkyds. These properties make waterborne alkyds less attractive to contractors who require paints with fast dry times and high coverage and hiding power for maximum productivity. This paper describes the use of commercial resinous polyols to produce alkyd resins with lower solvent demand, plus improved dry times, humidity and UV resistance compared to conventional medium- and long-oil alkyds. Partial replacement of pentaerythritol with styrene allyl alcohol (SAA) resinous polyols in standard alkyd resin syntheses results in a marked decrease in the resin polydispersities but little change in the number average molecular weights. Tire SAA polyol can be added to the process as a solid or a liquid, oil-modified polyol. The alkyd resin with the best overall properties was obtained by replacing a portion of the pentaerythritol, soybean oil, and phthalic anhydride with an SAA-modified soy polyol. Note de contenu : - INTRODUCTION : Styrene allyl alcohol copolymers use in alkyds - EXPERIMENTAL : Raw materials - Preparation of SAA oleates - Examples preparation of SAA alkyds - Preparation of pigmented alkyds coatings - RESULTS AND DSICUSSION : Long-oil alkyd resin composition, molecular weight, and polydispersity - SAA oleates - Long-oil alkyd coating properties - Table 1 : National, regional, and state VOC content rules for major architectural and industrial maintenance coating categories - Table 2 : Effect of low-VOC alkyd strategies on coating performance - Table 3 : Properties of commercial styrene allyl alcohol co-polymers - Table 4 : Low-viscosity long-oil alkyds based on SAA polyols - Table 5 : Composition and physical properties of SAA-100 oleates En ligne : https://drive.google.com/file/d/1NY0K6-uuc77TYku-i9lL_S9hFR3Gt_Bd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5558 [article]

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New low-viscosity acrylic-urethane prepolymers and their acrylated oligomers for moisture and UV-curable coatings / Daniel B. Pourreau in COATINGS TECH, Vol. 2, N° 15 (04/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 15 (04/2005) . - p. 42-48 Titre : New low-viscosity acrylic-urethane prepolymers and their acrylated oligomers for moisture and UV-curable coatings Type de document : texte imprimé Auteurs : Daniel B. Pourreau, Auteur ; Scott Smyth, Auteur Année de publication : 2005 Article en page(s) : p. 42-48 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : This article describes a new class of urethane acrylate oligomers for weatherable UV-curable systems. Unlike commercial urethane acrylates that are based on polyether or polyester polyols, this new class of urethane oligomers is based on acrylic polyols. These new acrylic polyols are unique in that they produce low-viscosity, nongelling urethane prepolymers with isophorone diisocyanate. These prepolymers can be further treated with hydroxy-functional acrylates such as hydroxyethylacrylate (HEA) or caprolactone acrylate (CA) to yield low-viscosity acrylated urethane acrylic oligomers. By replacing the polyester and polyether backbone in urethane acrylates with an acrylic backbone, this chemistry opens the door to more weatherable UV-curable coatings, with properties that approach two-component urethane systems. These new urethane acrylates were formulated into sprayable UV-curable coatings with properties that rival two-component urethanes. The influences of diluent monomer type and content, hydroxy acrylate, and solvents on coating viscosity, VOC content, and properties were evaluated En ligne : https://drive.google.com/file/d/1lS0Dv3L2Y8gw6zDovePu3tzPEWFYY8JX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5516 [article]

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