Aqueous compositions useful as printing vehicles

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 133/06 (2006.01) B41M 7/00 (2006.01) C09D 5/02 (2006.01) C09D 11/10 (2006.01) C09D 133/08 (2006.01)

Patent

CA 2171631

Provided are aqueous dispersion consisting essentially of high-molecular weight polymer prepared by aqueous suspension polymerizing a blend of monomers, said blend consisting essentially of: (i) a plasticizing amount by weight of a monomer selected from the group consisting of plasticizing alkyl acrylate monomers and mixtures thereof, (ii) a hardening amount by weight of a monomer selected from the group consisting of hardening alkyl acrylate monomers and mixtures thereof, and (iii) a crosslinking amount by weight of a monomer selected from the group consisting of di-ethylenically unsaturated monomers and mixtures thereof, in an aqueous suspension comprising a polymer component consisting essentially of a low-molecular weight, water-soluble, acrylic polymer having carboxylate functionality. Also provided is a method of coating a substrate comprising (i) contacting a surface of a substrate with an aqueous dispersion composition comprising an aqueous dispersion as defined above, and (ii) drying said surface to form a film of said polymer in contact with said surface. In preferred methods, said polymer in aqueous dispersion is supplied to said surface by a hydrophilic cylindrical transfer roll. These polymers are particularly useful as the binder for an ink composition, or an overprint varnish, having good wet block resistance.

L'invention concerne une dispersion aqueuse constituée essentiellement d'un polymère à haut poids moléculaire préparé par polymérisation en subspension aqueuse d'un mélange de monomères, ledit mélange étant constitué essentiellement de: (i) une quantité appropriée d'un ou de plusieurs acrylates d'alkyle monomères servant de plastifiant, (ii) une quantité appropriée d'un ou de plusieurs acrylates d'alkyle servant de durcisseur et (iii) une quantié appropriée d'un ou de plusieurs monomères de réticulation choisis dans le groupe des monomères à deux insaturations éthyléniques, dans une suspension aqueuse contenant un composant polymère constitué essentiellement d'un polymère acrylique hydrosoluble à bas poids moléculaire ayant des fonctions carboxylate. L'invention concerne également un procédé de revêtement d'un substrat consistant à (i) mettre en contact une surface d'un substrat avec une dispersion aqueuse ayant la composition définie ci-dessus et (ii) à sécher ladite surface pour former un film dudit polymère sur ladite surface. Dans les procédés préférés, ledit polymère en dispersion aqueuse est appliqué sur ladite surface par un rouleau de transfert cylindrique hydrophile. Ces polymères sont particulièrement utiles comme liants dans une composition d'encre ou comme vernis venant sur l'impression, car il produit une faible adhésion après compression à l'état humide.

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