Aqueous polymeric emulsion compositions and their use for...

D - Textiles – Paper – 21 – H

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D21H 23/02 (2006.01) C08F 2/24 (2006.01) D21H 17/37 (2006.01) D21H 17/41 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2359191

A method of sizing paper by applying a composition comprising an aqueous dispersion of polymeric particles of particle size up to 1 micron, preferably 80-200 nm, wherein the polymeric particles comprise a water insoluble polymer matrix, preferably formed from styrene and 2-ethylhexyl acrylate, characterised in that an oligomer formed from a monomer blend comprising, (a) (meth)acrylamide, and (b) organic mercaptan or an organic sulphone, preferably dodecyl mercaptan or dodecyl sulphone is located at the surface of the particles. Compositions where the oligomer further comprises an ethylenically unsaturated monomer comprising either a tertiary amine group or a quaternary ammonium group, preferably dimethylaminoethymethacrylate are novel. Advantages of the composition when applied to the surface of paper, include improved water resistance, brightness and printability properties of the treated paper.

La présente invention concerne un procédé de collage de papier par application d'une composition comprenant une dispersion aqueuse de particules de polymère de granulométrie inférieure à 1 micron, de préférence 80-200 nm, dans laquelle les particules de polymère contiennent une matrice polymérique insoluble, constituée de préférence de styrène et de 2-éthylhexyle acrylate, caractérisée en ce qu'un oligomère formé à partir d'un mélange de monomère comprenant, (a) du (méth)acrylamide, et (b) un mercaptan ou une sulfone organiques, de préférence un dodécyle mercaptan ou une dodécyle sulfone, est placé à la surface des particules. L'invention concerne aussi des compositions dans lesquelles l'oligomère comprend en outre un monomère à insaturation éthylénique contenant un groupe amine tertiaire ou ammonium quaternaire, de préférence un groupe diméthylaminoéthylméthacrylate. Appliquée à la surface du papier, la composition permet d'obtenir des avantages concernant la résistance à l'eau, le degré de blancheur et les propriétés d'aptitude à l'impression du papier traité.

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