Aqueous polyurethane dispersions having improved water and...

C - Chemistry – Metallurgy – 08 – L

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C08L 75/12 (2006.01) C08G 18/08 (2006.01) C08G 18/66 (2006.01) C08G 18/78 (2006.01) C09D 175/12 (2006.01)

Patent

CA 2243720

The present invention relates to aqueous polyurethane dispersions prepared from a polyisocyanate component and one or more isocyanate-reactive compounds wherein at least 5% by weight of polyisocyanate component is a diisocyanate corresponding to formula (I) <see Fig.1> wherein R is a difunctional, C4 to C18, aliphatic, cycloaliphatic or aromatic hydrocarbon residue obtained by removing the NCO groups from an organic diisocyanate and R' is a monofunctional, C1 to C18 hydrocarbon radical, which may contain ether oxygen atoms. The present invention also relates to the use of these PUR dispersions for coating any substrates, preferably wood substrates, such as parquet flooring.

La présente invention porte sur des dispersions aqueuses de polyuréthane, préparées à partir d'un constituant de type polyisocyanate et d'un ou de plusieurs composés réactifs avec les isocyanates; dans ces dispersions, au moins 5 % en poids des polyisocyanates sont des diisocyanates correspondant à la formule (I) <voir Fig. 1>, dans laquelle R est un radical hydrocarboné difonctionnel aliphatique, cycloaliphatique ou aromatique en C4-C18, obtenu par élimination des groupes NCO dans des diisocyanates organiques, et R' est un radical hydrocarboné monofonctionnel C1-C18, pouvant contenir des atomes d'oxygène de type éther-oxyde. La présente invention porte enfin sur l'utilisation de ces dispersions de PUR pour le revêtement de n'importe quel substrat, préférablement les substrats en bois, comme les parquets en marqueterie.

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