Improved polyurethane dispersions and coatings made therefrom

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/08 (2006.01) C08K 5/15 (2006.01) C08K 5/21 (2006.01)

Patent

CA 2554016

A polyurethane having enhanced properties is made from an aqueous polyurethane dispersion having therein a nonvolatile, non-reactive, property enhancing water-soluble (NNPEW) compound such as urea. Even though the NNPEW is soluble in water, the NNPEW remains in the polyurethane after being exposed to water. In another embodiment, the NNPEW may react with a compound present in the dispersion other than the polyurethane particles of the dispersion when removing the water of the dispersion to form the polyurethane or upon subsequent heating.

L'invention concerne un polyuréthane présentant des propriétés améliorées, constitué d'une dispersion aqueuse de polyuréthane qui contient un composé non volatil, non réactif, hydrosoluble, améliorant les propriétés, par exemple de l'urée. Ce composé, bien qu'il soit soluble dans l'eau, reste dans le polyuréthane après avoir été exposé à l'eau. Dans un autre mode de réalisation, ce composé peut réagir avec un composé présent dans la dispersion, autre que les particules de polyuréthane de la dispersion, lors de l'élimination de l'eau de la dispersion pour former le polyuréthane ou après un chauffage ultérieur.

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