VINYL ESTER/ETHYLENE-BASED BINDERS FOR PAPER AND PAPERBOARD COATINGS

• Main Authors: CONFALONE, PHILIP, FARWAHA, RAJEEV, GOHR, KERSTIN
• Format: Patent
• Language: English; French
• Published: 26.01.2012
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; IMPREGNATING OR COATING OF PAPER; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

Disclosed are surfactant-stabilized latex emulsions which can be used as binders in paper coating compositions. Such latex emulsions comprise an interpolymer formed by emulsion polymerizing monomers selected from vinyl esters, e.g., vineyl acetate; ethylene; certain unsaturated mono- and di-carboxylic acid materials such as acrylic acid or maleic anhydride; and certain polyethylenically unsaturated cross-linking co-monomers such as diallyl phthalate. These latex emulsions are stabilized with surfactants which are substantially free of environmentally suspect alkyl phenol ethoxylates (APEs). The paper coating compositions containing latex emulsion binders of this type exhibit especially desirable coating strength as quantified by the Dry Pick Values (as defined herein) which such compositions provide. L'invention concerne des émulsions de latex stabilisées par un tensioactif qui peuvent être utilisées comme liants dans des compositions de couchage de papier. Ces émulsions de latex comprennent un interpolymère formé par polymérisation en émulsion de monomères choisis parmi des esters vinyliques, par exemple, acétate de vinyle, l'éthylène, certains matériaux d'acide mono- et di-carboxyliques insaturés comme l'acide acrylique ou l'anhydride maléique, et certains comonomères de réticulation polyéthyléniquement insaturés comme le phtalate de diéthyle. Ces émulsions de latex sont stabilisées avec des tensioactifs qui sont sensiblement dépourvus d'éthoxylates d'alkylphénol suspects au plan environnemental. Les compositions de couchage de papier contenant des liants d'émulsion de latex de ce type présentent une résistance du couchage particulièrement désirable selon une quantification par les valeurs « Dry Pick » (définies ici) que ces compositions permettent d'obtenir.