Film for composite security disks with self-adhesiveness

Details Film for composite security disks with self-adhesiveness Film for composite security disks with self-adhesiveness

C - Chemistry, Metallurgy

08

K

C08K 5/103 (2006.01) B32B 17/10 (2006.01) B32B 27/08 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2469014

Films containing a plasticiser based on partially acetalised polyvinyl alcohols, especially PVB, adapted in such a manner that the intermediate layer in the composite security glass exhibit, aswell as excellent adhesiveness with respect to glass, non-desirable self-adhesiveness (blocking-tendency). A pentaerythrite ester of between 0.0001 0.1 wt % is therefore used as an additive to reduce said adhesiveness. Said additive does not alter the adhesiveness of the film with respect to glass. The invention is used in the production of films for producing composite security glass. The need for cooling the films in order for them to stacked or rolled up is greatly reduced.

Les feuilles contenant un plastifiant, à base de d'alcools polyvinyliques partiellement acétalisés, en particulier le PVB, adaptées en tant que couche intermédiaire dans des vitres de sécurité composites présentent, outre l'excellente adhésivité souhaitée par rapport au verre, une auto-adhésivité non souhaitée (propension à l'adhérence de contact). Un ester de pentaérythrite dans une quantité allant de 0,001 à 0,1 % en poids est utilisé en tant qu'additif réduisant l'auto-adhésivité. Cet additif ne modifie pas l'adhésivité de ladite feuille par rapport au verre. La présente invention est utilisée pour produire des feuilles destinées à la fabrication de vitres de sécurité composites. La nécessité de refroidir les feuilles lorsqu'elles doivent être empilées ou enroulées est ainsi largement superflue.

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