Enhancing cleanability / Janos Hajas in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 16-20 Titre : Enhancing cleanability Type de document : texte imprimé Auteurs : Janos Hajas, Auteur Année de publication : 2002 Article en page(s) : p. 16-20 Langues : Anglais (eng) Catégories : Copolymère silicone acrylate Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Peinture -- Lavage Polyuréthanes Revêtements -- Additifs:Peinture -- Additifs Revêtements anti-graffitis Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : The author writes about a new additive which has been introduced to enhance the surface cleaning properties of coatings. A new? OH-functional silicone modified acrylate additive will be introduce to enhance the surface cleaning properties (cleanability) of coatings. Crosslinkable via OH-groups, the additive provides long lasting significant improvements in cleanability so that adhering dust and dirt particles as well as graffiti can be removed much easier compared to 'normal' surfaces. Results in various types of coatings (two-pack polyuethanes, thermoset melamine topcoats, and so on) will be presented. Present and potential new applications for silicone modified crosslinkable acrylates in various types of coatings will be highlighted. Note de contenu : - Test results - Energy and tension - Liquid coatings - Dirt and dust release properties - Anti-fouling properties - Anti-graffiti properties - Practical applications - FIGURES : 1. Shows the properties of this new additive - 2. Surface tension (polar + dispersed) of crosslinked PU coating films - 3. Surface tension (polar component) of crosslinked PU films - 4. Improvement of surface cleanability with silicone modified additive - 5. Influence of the additive level on fouling (slime, barnacles, worms and seaweed) - 6. Influence of the additive level on fouling (fungus) - TABLE : Surface tension reduction with two different additives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27991 [article]

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Modified urea thickeners : now also for aqueous systems / Janos Hajas in PAINTINDIA, N° Annuel 2003 (2003)

[article]  inPAINTINDIA > N° Annuel 2003 (2003) . - p. 151-158 Titre : Modified urea thickeners : now also for aqueous systems Type de document : texte imprimé Auteurs : Janos Hajas, Auteur ; Axel Woocker, Auteur Année de publication : 2003 Article en page(s) : p. 151-158 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Modified urea compounds can be used as very powerful liquid rheology additives in coatings. Their rheological impact in various coating systems is directly related to the specific chemical modifications that can be made to the polyurea molecule. Modifications evaluated were made using the end groups of varying polarities such as low polarity alkyl groups, medium polarity segments, or highly polar structures. These additives result in coatings with exceptional resistance to settling during storage, along with good sag resistance. The latest addition to the existing low and medium polarity modifications is a highly polar product, suitable for aqueous systems. Typical effects and properties of the new additive will be highlighted. The advantages for coating producers and users will be shown using several practical application examples compared with conventional rheological additives. Note de contenu : - Modified urea rheology additives : chemistry and method of action - Rheology effects as function of modification - Characterization of modified ureas under various polarity conditions - Low polarity urea thickener - Medium polarity urea thickener - Highly polar urea thickener - Applications - Low polarity modified urea - Medium polarity modified urea - Highly polar modified urea - Advantages over conventional rheology additives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12092 [article]

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A novel wetting and dispersing additive for resin-free pigment concentrates / Janos Hajas in PAINTINDIA, ANNUAL 1998 (1998)

[article]  inPAINTINDIA > ANNUAL 1998 (1998) . - p. 79-84 Titre : A novel wetting and dispersing additive for resin-free pigment concentrates Type de document : texte imprimé Auteurs : Janos Hajas, Auteur ; Andreas Arhrens, Auteur Année de publication : 1998 Article en page(s) : p. 79-84 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : A new high molecular weight polymeric wetting and dispersing additive was developed t osolve pigment dispersion problems in waterborne high quality coatings and pigment concentrates. Its dispersing effect can be explained by interfacial activity and anchoring to pigment surfaces resulting in good stabilization of all pigments in emulsions, solutions and hybrid aqeous coatings. Anti-floating and pigment dispersion results, compared to results with conventional additives, are encountered in various aqueous coatings formulations. Formulations containing the polymeric wetting and dispersing additive displays a very high degree of pigment stabilization and good compatibility with several resin types. Results with various grinding methods are being discussed. Recommendations for practical coatings applications are being provided along with detailed information on advantages, usage areas and side effects. Note de contenu : - Characteristics of the novel wetting and dispersing additive - Comparison to conventional wetting and dispersing additives - Advantages of the new wetting and dispersing additive technology - Perfomance characteristics : grinding in resin of resin-free ? - Application areas Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13162 [article]

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A renewable polymer matting agent for coating applications / Janos Hajas in SURFACE COATINGS INTERNATIONAL, Vol. 96, 6 (12/2013)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 96, 6 (12/2013) . - p. 310-313 Titre : A renewable polymer matting agent for coating applications Type de document : texte imprimé Auteurs : Janos Hajas, Auteur ; Ronald krijns, Auteur ; Petra Lenz, Auteur ; Magdalena Bodi, Auteur ; Marc Hans, Auteur Année de publication : 2013 Article en page(s) : p. 310-313 Langues : Anglais (eng) Catégories : Agent mattant Biodégradation Biopolymères Polyesters Résistance à l'abrasion Revêtements:Peinture Toucher soft Index. décimale : 667.6 Peintures Résumé : A high molecular weight natural polyester-type biopolymer, based on renewable resources and produced in a fermentation process, can be used in various types of coatings for gloss reduction. Matting results in aqueous, solvent-borne and 100% solids radiation-curing coating, wood and low-bake industrial coating formulations are highlighted in comparison to silica- and wax-based matting additives. The new matting technology provides effective gloss reduction in many systems, without significantly increasing the viscosity, and without adversely impacting levelling, transparency and air release characteristics. Spin-off benefits include the improvement of the scratch- and abrasion-resistance and soft-touch properties of the coating film, together with a pronounced anti-slip effect. The new matting agent is also completely biodegradable. Note de contenu : - NATURAL POLYMERS FOR MATTING OF COATINGS - A BIOPOLYMER AS A NEW MATTING AGENT : General properties of the new biopolymer matting agent - Matting and other surface property changes - Matting in various types of coatings - POSSIBLE DRAWBACKS IN COATINGS : Impact on storage stability - Impact on transparency - Chemical and stain resistance - Crosslinking with the resin matrix ? - Settling tendencies En ligne : https://drive.google.com/file/d/1o8O-h9xQKvwL-kKsZ60uMCw14x-uXqFS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20072 [article]

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Thickening by thinning - A novel liquid rheology additive for selvent-based and solvent-free coatings / Janos Hajas in PAINTINDIA, Vol. XLVII, N° 10 (10/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 10 (10/1997) . - p. XIX-XXI Titre : Thickening by thinning - A novel liquid rheology additive for selvent-based and solvent-free coatings Type de document : texte imprimé Auteurs : Janos Hajas, Auteur Année de publication : 1997 Article en page(s) : p. XIX-XXI Langues : Anglais (eng) Catégories : Dilution Epaississants Revêtements -- Additifs:Peinture -- Additifs Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : A new liquid rheology additive based on a modified urea was developed to solve rheology problems in solvent-based and solvent-free coatings. Its thickening mechanism can be explained by selective insolubility of the modified urea, which results in a controlled separation of fine, needle-like particles demonstrating strong cohesive interactions. The final result of such interactions is a three-dimensional network which improves the rheological properties. Anti-settling and sag control results, compared to results with conventional additives, will be presented in coatings formulations with various polarities. Formulations containing the modified urea thickener displayed very intense shear-thinning effects and high thixotropy levels. Results with various incorporation methods will be discussed. Recommendations for practical coatings applications will be provided along with detailed information about advantages, usage areas and side-effects. Note de contenu : - Chemistry and method of action - Rheology effects - Application fields : solvent-based and solvent-free systems Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13321 [article]

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Third generation additives / Janos Hajas in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4524 (05/2008)  

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