[article]
| Titre : |
UV silicone release coatings : state of the art |
| Type de document : |
texte imprimé |
| Auteurs : |
Stuart R. Kerr III, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 26-32 |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésifs -- Séchage sous rayonnement ultraviolet
Adhésifs sensibles à la pression
Colles:Adhésifs
Revêtements anti-adhésion
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
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| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
Silicones (polyorganosiloxanes) are highly flexible polymers based on an inorganic backbone of repeating silicon and oxygen atoms bonded together such that each silicon atom has attached to it two pendant organic groups based on hydrogen and carbon. For silicones used in release coatings chemistries these pendant hydrocarbons are usually methyl (-CH3) groups.Considering that the polysiloxane backbone is surrounded by an encompassing sheath of methyl hydrocarbons, and taking into account that hydrocarbons such as waxes and motor oils are characterized with lubricity and "non-stick" low surface energy, it is not surprising to find that silicones are similarly characterized. What distinguishes silicones from simple hydrocarbons are their better mechanical properties and higher temperature resistance. Release coatings based on chemically reacted silicones provide "easy release" surfaces for a variety of "sticky" applications. These silicone release coatings provide a non-adhering surface for paper and films upon which adhesives may be coated, handled and transported.Silicone release coated papers and films, when laminated to pressure sensitive adhesive (PSA) coated materials such as labels and tapes, provide both protection for the adhesive coated product (such as in preparation for slitting, die-cutting, etc.) and they provide subsequent easy release of the release coated paper or film from the adhesive surface immediately prior to its final use.For example, when "sticky" labels are manufactured, it is necessary to provide a removable paper or film backing that can be peeled away easily from the PSA coated label when it is ready for application. After it has served its purpose, this removable backing is either disposed of or recycled.In another example, certain types of adhesive tapes are coated on their backsides with a silicone release coating to allow the tape to unroll easily. If both sides of the paper or film on which the PSA is coated are "differentially" treated with a silicone release (one release coated side provides measurably easier release than the other), a "transfer tape" can be manufactured such that the free and unsupported PSA adhesive layer can be transferred easily to any other desired surface. For every released application, it is critically important that the adhesive side of these laminated constructions remains virtually unaffected by prolonged contact with the cured (chemically crosslinked) silicone coating. The silicone release coating must not contaminate the adhesive through migration of unreacted silicone oils, thereby degrading the adhesive performance or causing secondary contamination issues (e.g., for indirect food contact applications). The silicone release coating must also provide highly stable release over time; the adhesive and the silicone surfaces must not "lock up" whereby the paper or film liner is no longer easily removed. |
| Note de contenu : |
- Silicone release coating technologies
- UV curable silicone release coatings
- Cationic UV cure silicones |
| En ligne : |
https://drive.google.com/file/d/1pAFe4bm1fiw3vL2AP8SsO-4ZSqgf-2ZW/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20536 |
in ADHESIVES AGE > Vol. 39, N° 8 (07/1996) . - p. 26-32
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UV silicone release coatings : state of the art in ADHESIVES AGE, Vol. 39, N° 8 (07/1996)
