Dépouillements

Improving adhesion of high vinyl (SVS) polymers using modified diblocks / D. F. Graves in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 51-55 Titre : Improving adhesion of high vinyl (SVS) polymers using modified diblocks Type de document : texte imprimé Auteurs : D. F. Graves, Auteur ; D. D. Tondra, Auteur Année de publication : 1997 Article en page(s) : p. 51-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression Adhésifs thermofusibles Copolymère styrène butadiène styrène Copolymères séquencés Diméthylacrylamide Vinylpyridine Index. décimale : 668.3 Adhésifs et produits semblables Résumé : This study again shows that the adhesion of the new high vinyl block polymers (SVS) to non-polar substrates can be improved by adding diblock to the PSA mixture. Although work at still lower molecular weight needs to be done, it was shown that a diblock at about 40K is a better modifier than a higher MW diblock (100K). It was also shown that without vinylpyridine in the diblock structure, the all initial charge polymers (tapered blocks) were better than the sequential monomer addition (true blocks). Polar functionality, in general, improved adhesion to the tested substrates. In this study the functional groups were always blocked on the chain ends, either as a single unit or in the case of dimethylacrylamide (DMA) or vinylpyridine (VP), a low molecular weight block. Simple termination with an OH group seemed to work best for improving quick stick and adhesion to PP when placed at the end of an S/B tapered block structure. Also, as the level of either DMA or VP was increased, the adhesion improved. A future study will look at higher amounts of these two monomers. Adhesion to other subtrates would most likely be improved by the addition of different functional groups, such as alkoxysilane end-groups improving adhesion to glass. This will also be the subject of a future study. The introduction of an ionic network into the PSA from the quaternization of the VP blocks also showed some potential for improving adhesion. Again, more work is needed in this area with additional substrates. Note de contenu : - EXPERIMENTAL : Diblocks - Formulations - Sample preparation - TESTING : Quick stick 90° angle to stainless steel (SS) - 180° peel adhesion to PE or PP En ligne : https://drive.google.com/file/d/1maYZljfGuzeSJENMxHmBSk6GfBJGX9jB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20463 [article]

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Performance control of polyether-based reactive hot melt adhesives / Ricardo De Genova in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 57-60 Titre : Performance control of polyether-based reactive hot melt adhesives Type de document : texte imprimé Auteurs : Ricardo De Genova, Auteur ; Laura Grier, Auteur ; D. Phillip Murray, Auteur ; William Clay, Auteur Année de publication : 1997 Article en page(s) : p. 57-60 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs thermofusibles Polyéther uréthane Polyols Rhéologie Stabilité thermique Viscosité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The study shows that by manipulating the polymer structure, it is possible to produce polyether polyol-based polyurethane reactive hot melt adhesive systems with green strengths, viscosity and melt stability properties comparable to polyester polyol-based systems. Melt stability is affected by the final NCO content of the prepolymer and the temperature of application. Higher index allows for lower application temperatures, which is considered a desirable feature by the adhesive user due to industrial hygiene concerns. For the purposes of this study, tack free times were faster than what is normally expected, but it should be noted that this work was carried out on prepolymers without any further formulation additives. The adhesive manufacturer can manipulate this variable to some extent by using tackifiers. Note de contenu : - Green strength - Viscosity - Melt stability - Tack free time En ligne : https://drive.google.com/file/d/1ZZusP5Z7zBsoUhpk3XD5PXweYx0Vt7xg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20464 [article]

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Water-dispersible hot melt adhesive formulations / Richard A. Miller in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 63-66 Titre : Water-dispersible hot melt adhesive formulations Type de document : texte imprimé Auteurs : Richard A. Miller, Auteur ; Gregg Althen, Auteur Année de publication : 1997 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs à usages médicaux Adhésifs en phase aqueuse Adhésifs sensibles à la pression Adhésifs thermofusibles Etiquettes Nontissés Pansements Polyesters Polyéthylène Rhéologie Index. décimale : 668.3 Adhésifs et produits semblables Résumé : For some time, the hot melt adhesives industry has searched for a water-dispersible raw material to aid in the development of repulpable adhesives. This article discusses new water-dispersible, branched polyesters as raw materials for formulating repulpable hot melt adhesives. The branched polyesters provide a unique combination of water dispersibility and other key characteristics that the adhesive industry requires. Note de contenu : - TECHNICAL ASPECTS OF POLYESTERS - PRODUCTION FUNCTION - PRODUCT DESCRIPTION - EXPERIMENTAL OBJECTIVE - EXPERIMENTAL PROCEDURE : Phase I : screening - Phase II and III : model-fitting and confirmation - STARTING POINT FORMULATIONS : Case/carton closing - Multiwall bags - PET bottle label adhesive - Nonwoven adhesive - Pressure sensitive adhesives En ligne : https://drive.google.com/file/d/1DRruDriwoqWeyZYWI2jXYbXKO0CnhXp1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20465 [article]

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Photocurable adhesives : 10 tips for best performance in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 67-70 Titre : Photocurable adhesives : 10 tips for best performance Type de document : texte imprimé Année de publication : 1997 Article en page(s) : p. 67-70 Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement ultraviolet Photoréticulation Réticulation (polymérisation) Réticulation à l'humidité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Although they've been around almost as long as the Rolling Stones, ultraviolet- and lightcuring adhesives are now coming into their own as a value-added replacement for traditional adhesives and other fasteners in many assembly processes. Collectively known as photocurable adhesives, UV- and light-cure adhesives have become essential to many high-tech assembly operations where high throughput and delicate components are the norm, according to Colin McLean, research associate, Ablestik Electronic Materials and Adhesives, Rancho Dominguez, Calif., which is owned by National Starch and Chemical Co., Bridgewater, N.J. Two other photocurable adhesive and coating suppliers owned by National Starch, Permabond of Englewood, N.J., and Emerson & Cuming Specialty Polymers of Lexington, Mass., say that OEMs and other assemblers are switching to light cure products for new or refurbished production lines that need lower temperature curing and faster setting adhesives and coatings. Generally, the term photocurable denotes adhesives that cure when exposed to ultraviolet light, visible light or a combination of both. Traditional adhesives rely on chemical reactions initiated by heat, solvent evaporation, mixing of multiple components or other chemical conditions, like the presence of moisture, metal ions or the absence of oxygen to effect a cure. Photocurable adhesives require the presence of the correct wavelengths of light at sufficient intensity to form durable structural bonds. UV- and light-cure adhesives use photoinitiators to activate the cure. Light energy is absorbed by photoinitiators in the adhesive formulation, causing them to fragment into highly reactive species that are able to polymerize or crosslink with other components of the formulation. In acrylate-based adhesives, the reactive species formed in the initiation step are known as free radicals. Another type of photoinitiator, a cationic salt, is used to polymerize epoxy functional resins, generating an acid that reacts to create the cure. Note de contenu : - Get the right formulation for the job - What light source is required? - Do you have the correct lamp? - Account for the substrates - Consider dual-cure systems for shadowed areas - Use a radiometer to measure light output in the curing system - Fix the position of the lamp - Account for post-cure effects - Profile the curing system - Choose a supplier that can optimize the process En ligne : https://drive.google.com/file/d/14SNdz3sH17NiyMXOwAwT5iHREZ1nNxDr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20476 [article]

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Spray bonding helps to create versatile fiberfill products in ADHESIVES AGE, Vol. 40, N° 12 (11/1997)  

[article]  inADHESIVES AGE > Vol. 40, N° 12 (11/1997) . - p. 72-74 Titre : Spray bonding helps to create versatile fiberfill products Type de document : texte imprimé Année de publication : 1997 Article en page(s) : p. 72-74 Langues : Américain (ame) Catégories : Collage Dépôt par pulvérisation Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Using innovative technology, Hobbs Bonded Fibers has become a leader in the development of synthetic fiber batting and other fiberfill products for the apparel, home furnishings and industrial markets. The company's founder, Carey Hobbs, attributes much of its success to the versatility achieved by the spray bonding of fiberfill with environmentally friendly resins. The company began operations in 1970 as Clark Brothers Felt Co. in Groesbeck, Texas. At the time, Mr. Hobbs saw a promising future for spray bonded polyester fiberfill products. That observation came about "almost by accident." The company was already using starch supplied by National Starch and Chemical Co., Bridgewater, N.J., to bond sisal fibers in the manufacture of insulating pads for bedsprings. Then the U.S. Department of Agriculture began to promote bonded cotton applications in cooperation with the Cotton Batting Institute. Mr. Hobbs saw an opportunity to apply this same concept to polyester fibers, which he believed would create better products. This idea led to the founding of Hobbs Bonded Fibers, and innovation became the company's hallmark. Hobbes became the first company to make a high loft air filtration media with the fiber orientation perpendicular to the airflow that has become the standard in HVAC filtration. In 1976 it obtained FHA approval for the country's first synthetic carpet underlay. Mr. Hobbs considers spray bonding as a key element in the succes of these products. Note de contenu : - Spray bonding versatility - Spray bonding production - Product scope - The Hobbs team En ligne : https://drive.google.com/file/d/16BPyh7VevFMhEE3qF1whvvl-o5EFYKMA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20477 [article]

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