Aqueous dispersions or solutions having a long shelf life...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/70 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2355908

The invention relates to one-pack aqueous dispersions or solutions of functional polymers, whereby said dispersions or solutions have a long shelf life, and to surface-deactivating solid polyisocyanates which cross-link under normal conditions. The aqueous dispersions contain solid polyisocyanates which have been surface-deactivated with polyamines. Said polyisocyanates have an average particle size less than or equal to 10 µm and functional isocyanate- reactive polymers. Characteristics of the polymers which are dispersed or dissolved in water are a minimal film-forming temperature (MFT) less than or equal to +5~ C, a glass-transition temperature Tg less than or equal to -5~ C and a storage module G' less than or equal to 107 Pa when measured at 10 Hertz and at 10~ C. After application and evaporation of the water, a closed film is building up. Said film can dissolve the surface-deactivation of the solid isocyanates which are dissolved in the polymer phase and react spontaneously with the functional groups under normal conditions, i.e. with the hydroxyl and amino groups of the polymer. Polymer layers having a higher heat and solvent resistance are the result. Said layers can be used as contact adhesives, assembly adhesives or coatings.

L'invention concerne des dispersions ou des solutions aqueuses à un composant, stables au stockage, de polymères fonctionnels et de polyisocyanates solides désactivés en surface, qui subissent une réticulation dans des conditions normales. Les dispersions aqueuses contiennent des polyisocyanates solides, désactivés en surface avec des polyamines, dont la taille moyenne des particules est inférieure ou égale à 10 µm, ainsi que des polymères fonctionnels réagissant aux isocyanates. Les caractéristiques des polymères fonctionnels dispersés ou dissous dans l'eau sont les suivantes: température de formation de film minimale <= + 5 ·C; température de transition vitreuse Tg <= 5 ·C; et un module de conservation G' <= 10?7¿ Pa, mesuré à une fréquence de 10 Hertz et à une température de 10 ·C. Après application et évaporation de l'eau, un film fermé se forme, cette formation déclenchant la désactivation en surface des isocyanates solides qui sont dissous dans la phase polymère et réagissent, dans des conditions normales, spontanément avec les groupes fonctionnels, c'est-à-dire, par exemple, avec les groupes hydroxyle et amino du polymère. Il résulte de cela des couches polymères présentant une résistance élevée à la chaleur et aux solvants, qui peuvent être utilisées en tant qu'adhésifs de contact, adhésifs de montage ou revêtements.

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