Aqueous blends of colloidally dispersed polymers

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 101/00 (2006.01) C08J 3/03 (2006.01) C08L 57/00 (2006.01) C09D 5/02 (2006.01) C09D 201/00 (2006.01)

Patent

CA 2229031

The invention pertains to aqueous blends of colloidally dispersed polymers for use in making organic coatings which are hard and ductile at ambient temperature, which coatings remain stiff and elastic at temperature well above their film-formation or drying temperature. In particular, the invention relates to specific combinations or thermoplastic blends of polymers of very high molecular weights. Such blends produce smooth, essentially crack-free coatings when dried conventionally under atmospheric pressure. Such blends are capable of developing the desired balance of properties without conventional amounts of volatile organic coalescing aids and without the need for chemical cure.

La présente invention concerne des mélanges aqueux de polymères dispersés de manière colloïdale, destinés à la fabrication de revêtements organiques durs et ductiles à température ambiante, lesdits revêtements restant rigides et élastiques à des températures largement supérieures à leur température de formation de films ou de séchage. En particulier, l'invention concerne des combinaisons spécifiques de mélanges thermoplastiques de polymères ayant des poids moléculaires très élevés. Les mélanges de ce genre donnent des revêtements lisses, sensiblement exempts de fissures, quand ils sont séchés d'une manière classique à la pression atmosphérique. Ils sont capables de réaliser l'équilibre désiré entre différentes propriétés, sans que l'on emploie les quantités habituelles de substances organiques volatiles d'aide à l'agglomération et sans qu'un durcissement chimique ne soit nécessaire.

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