Dépouillements

Water-dispersible raw materials for hot melt adhesives / Richard A. Miller in ADHESIVES AGE, Vol. 39, N° 12 (11/1996)  

[article]  inADHESIVES AGE > Vol. 39, N° 12 (11/1996) . - p. 21-26 Titre : Water-dispersible raw materials for hot melt adhesives Type de document : texte imprimé Auteurs : Richard A. Miller, Auteur ; Gregg M. Althen, Auteur Année de publication : 1996 Article en page(s) : p. 21-26 Langues : Américain (ame) Catégories : Adhésifs à usages médicaux Adhésifs en phase aqueuse Adhésifs thermofusibles Cosmétiques Emballages Essais d'adhésion Essais de pelage Etiquettes Matières premières Nontissés Polyesters Polyéthylène Polyéthylène téréphtalate Polymères ramifiés Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Repulping of paper products has created a need for hot melt adhesives that are water-dispersible. Eastman Chemical Co. has developed a family of branched, water-dispersible polyesters suitable for formulating aqueous dispersions as well as hot melt adhesives for packaging, nonwovens and other uses. Available in a range of viscosities, these materials offer the following key features when formulated into hot melt adhesives. - 100% water-dispersible in ordinary tap water at room temperature in less than three hours; conventional industry standard formulations are non-dispersible. - non-dispersible in ionic solutions (i.e., body fluids); competitive water-dispersible technologies are not ionic by nature and, therefore, likely to have some degree of solubility in saline solutions. - superior adhesion to polyolefin films; hot melt adhesives based on these branched polyesters have from 10% to 110% better adhesion to PE and PET than conventional formulations. Some of the current technologies do not adhere to polyolefins. - comparable key physical properties to conventional formulations; characteristics such as Tg, softening point, elongation, shear adhesion failure temperature and peel adhesion failure temperature are comparable for these branched polyesters and conventional hot melt polymers. The purpose of this article is to discuss these new branched polyesters as raw materials for hot melt adhesives that are water-dispersible and to review the statistical experimental process by which their adhesive performance is optimized. Note de contenu : - PRODUCT FUNCTION - APPLICATIONS : Nonwovens - Packaging adhesives - OTHER APPLICATIONS : Removable labels for PET bottles - Adhesive for wound care patches - Film-former for cosmetics - Competitive matrix - TECHNICAL APSECTS OF POLYESTERS - INCORPORATION INTO ADHESIVE FORMULATIONS - PHYSICAL PROPERTIES OF BRANCHED POLYESTERS En ligne : https://drive.google.com/file/d/1ht9xoUhXeE_I1zP5tK75nIZJYsNivNbt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20544 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
001069	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

The HMDA concept : a new method for selection of resins / John Simons in ADHESIVES AGE, Vol. 39, N° 12 (11/1996)  

[article]  inADHESIVES AGE > Vol. 39, N° 12 (11/1996) . - p. 28-34 Titre : The HMDA concept : a new method for selection of resins Type de document : texte imprimé Auteurs : John Simons, Auteur Année de publication : 1996 Article en page(s) : p. 28-34 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs thermofusibles Cires Compatibilité chimique et physique Copolymère éthylène acétate de vinyle Copolymère éthylène acrylate de butyle Copolymère éthylène acrylate de méthyle Polyalphaoléfine amorphe Index. décimale : 668.3 Adhésifs et produits semblables Résumé : During the last two decades, the use of hot melt adhesives has increased considerably in many areas, including applications such as packaging, bookbinding, edge veneering and product assembly. Ethylene vinyl acetate (EVA) and ethylene butyl acrylate (EBA) copolymers are considered the most versatile materials for these products, offering many benefits for an almost endless number of applications. EVAs are commonly compounded with hydrocarbon, terpene- and rosin-derived tackifying resins, and waxes, since the EVA copolymer alone is not capable of meeting all requirements. Resins and waxes may be added to the polymer as a processing aid to improve flow by reducing the viscosity of the system to a level that allows good substrate wetting and fast application. In addition, resins decrease the yield point of the polymer, providing enhanced flexibility, higher hot tack, improved heat sealability and better specific adhesion. The need for EVA copolymers to be modified with resins, as well as the great number of application and equipment variables, has given rise to the development of many different types of resin. Selecting the optimum resin out of the multitude of available grades is one of the most complicating and time consuming activities for the adhesive compounder. This article describes a fundamental and practical compatibility concept for the initial selection of resins in a variety of polymers. Note de contenu : - COMPATIBILITY - CLOUDPOINT TECHNIQUES - THE HMDA CLOUDPOINT - HMDA COMPATIBILITY CONTOUR DIAGRAMS : Critical regions - POLYMER COMPATIBILITY CONTOURS OF EVA, EBA, EMA AND APAO POLYMERS - PRACTICAL APPLICATIONS - RESIN BLENDING, EVA/RESIN/WAX BLENDS : Waxes - FUTURE TRENDS - EXPERIMENTAL : Polymers - Resins En ligne : https://drive.google.com/file/d/1Bvy3oIdCXtHjKdbFY7NMuq3q-Xo-mEwr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20545 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
001069	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

Synergistic block copolymers and resin tackifier development / Jean M. Tancrede in ADHESIVES AGE, Vol. 39, N° 12 (11/1996)  

[article]  inADHESIVES AGE > Vol. 39, N° 12 (11/1996) . - p. 36-39 Titre : Synergistic block copolymers and resin tackifier development Type de document : texte imprimé Auteurs : Jean M. Tancrede, Auteur ; Charles F. Diehl, Auteur Année de publication : 1996 Article en page(s) : p. 36-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs thermofusibles Caoutchouc styrène-butadiène Copolymère styrène isoprène Copolymères séquencés Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The trends in hot melt adhesives (HMAs) are toward high-strength, low-viscosity systems that are stable, light in color and low in odor and can be applied at cooler temperatures at the lowest system cost. Since the adhesive polymer is responsible for the overall strength of the adhesive formulation and is generally the more expensive component, hot melt polymer design is aimed toward building maximum strength that will allow it to be formulated economically. The polymer composition, architecture and size are chosen not only for maximum strength but also to satisfy other critical adhesive parameters discussed in this article. In the area of disposables, HMA applications challenge the formulating technology extensively, in particular those formulations based on styrenic block copolymers (SBCs). Often the SBC polymer represents less than 20% of the total adhesive system. In order to maximize the extendibility of the SBC polymer, it is important that the other formulating components are carefully chosen or designed for maximum compatibility. Of these other formulating components, the tackifier is most important, since it is often present in the formulation at three times the level of the base SBC polymer. In this article, we will discuss synergistic styrenic block copolymer and tackifier developments that, when combined, achieve the high-performance properties required of hot melt applications in general and disposable applications in particular. We will describe the chemistry and properties of unique and patented radial polystyrenepolyisoprene (SI) copolymers and those of equally unique resin tackifiers that represent a breakthrough in light color technology. In addition, we will showcase the performance attributes of formulations based on these synergistic components. Note de contenu : - Radial, high styrene (SI)4 new polymer development - Radial coupling enhancement for radial (SI)n polymers - Radial vs. linear SBC and HMA melt rheology En ligne : https://drive.google.com/file/d/1vtN2gEZz2V6-jNxzNNGoc6-N77zVOH9f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20546 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
001069	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

Balancing adhesion and cohesion in WB packaging adhesives / Bradley A. Jacobs in ADHESIVES AGE, Vol. 39, N° 12 (11/1996)  

[article]  inADHESIVES AGE > Vol. 39, N° 12 (11/1996) . - p. 40-44 Titre : Balancing adhesion and cohesion in WB packaging adhesives Type de document : texte imprimé Auteurs : Bradley A. Jacobs, Auteur Année de publication : 1996 Article en page(s) : p. 40-44 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs en phase aqueuse Adhésion Copolymère acrylique acétate de vinyle Groupement carboxyle Pelage Polyacétate de vinyle Résistance à l'arrachement Résistance au cisaillement Résistance au fluage Réticulation (polymérisation) Thermogravimétrie Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Challenges posed by low energy substrates, environmental regulations, product integrity and economic pressure place demands on adhesive performance that are increasingly difficult to meet using traditional technologies. PVOH-stabilized vinyl acetate/acrylics present a new approach to satisfying these demands. While VAAs have found initial acceptance in applications requiring Tgs below the range accessible with VAE technology, this work has demonstrated that VAAs offer advantages even at higher Tgs. Rovace HP-3442 exhibits an attractive combination of adhesion to a wide range of difficult-to-bond substrates, cohesive strength comparable to VAEs and good creep resistance. The scope of this study has been the performance of the copolymer backbones, but other advantages of using VAAs become apparent when compounding begins. PVOH stabilization gives the VAAs excellent mechanical stability and compatibility with common formulating raw materials. The incorporation of carboxyl functionality provides reactive groups for crosslinking chemistry. And the vinyl acrylic copolymers are compatible with a range of tackifiers and other additives that provide added versatility and flexibility for formulating to meet specific performance requirements (3). Couple these benefits with the economics of vinyl acetate copolymers and one can see low VAAS are the-state-of-the-art in waterborne adhesive emulsions. Note de contenu : - ADHESION VS.COHESION - EXPERIMENTAL : Quantitative adhesive strength - Quantitative cohesive strength - 180° peel adhesion - Hot shear strength - Thermogravimetric analysis (TGA) - RESULTS AND DISCUSSION : Peel adhesion - Shear adhesion En ligne : https://drive.google.com/file/d/1SJqmHAC8Nj95GNliW1XCmKH_fQtbEo33/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20547 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001069	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt