Dispersions of polyurethanes, their preparation and use

Details Dispersions of polyurethanes, their preparation and use Dispersions of polyurethanes, their preparation and use

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) C08G 18/67 (2006.01) C08G 18/78 (2006.01) C09D 17/00 (2006.01) C09D 175/16 (2006.01)

Patent

CA 2731927

The present invention relates to the use of aqueous dispersions containing a pigment (B) which is at least partially enveloped by polyurethane (A) and also at least one polymerization inhibitor (C), wherein polyurethane (A) can be obtained by reacting (a) from 15 to 70% by weight of diisocyanate or polyisocyanate which has an average of from 1 to 10 allophanate groups and an average of from 1 to 10 C-C double bonds per molecule and optionally (b) from 0 to 60% by weight of a further diisocyanate or polyisocyanate with (c) from 5 to 50% by weight of compounds having at least two groups which are capable of reacting with isocyanate, where amounts in % by weight are based on the total polyurethane (A), in printing inks.

La présente invention concerne lutilisation de dispersions aqueuses, contenant un pigment (B) au moins partiellement revêtu de polyuréthane (A) et également au moins un inhibiteur de polymérisation (C), dans des encres dimpression. Selon linvention, le polyuréthane (A) peut être obtenu par réaction de (a) 15 à 70 % en poids dun di- ou polyisocyanate, qui contient en moyenne 1 à 10 groupes allophanate et en moyenne 1 à 10 doubles liaisons C-C par molécule, et éventuellement (b) 0 à 60 % en poids dun di- ou polyisocyanate supplémentaire, avec (c) 5 à 50 % en poids dun composé contenant au moins deux groupes aptes à réagir avec des isocyanates, les données de % en poids se rapportant au polyuréthane (A) total.

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