Repulpable hot melt polymer/wax compositions for fibrous...

C - Chemistry – Metallurgy – 08 – L

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C08L 35/00 (2006.01) C08K 5/09 (2006.01) C08L 33/00 (2006.01) C08L 91/06 (2006.01) C09D 133/00 (2006.01) C09D 135/00 (2006.01) D21H 19/14 (2006.01) D21H 19/18 (2006.01) D21H 19/20 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2167814

Hot melt wax compositions are described that render fibrous products such as paper, paperboard and corrugated paper containers water-resistant at room temperature, but enable such articles to be repulped and recycled when the coated articles are repulped in a heated nearly neutral to alkaline aqueous medium. The compositions comprise from about 20 % to 97.5 % by weight of a water-repellent wax that is a solid at 20 °C; from about 2.5 % to 50 % by weight of an addition polymer of from about 50 to 95 mole percent of an ethylene-1,2- dicarboxylic acid or anhydride and from about 5 to 50 mole percent of at least one additional ethylenically unsaturated monomer selected from the group consisting of 1-alkenes having from about 4 to 60 carbon atoms wherein the polymer is dispersible in the water-repellent wax; optionally from about 1 to 90 mole percent of the carboxyl groups in the polymer may be further modified by reaction with a substituted or unsubstituted monoalcohol or monoamine; and optionally, from about 5 % to 75 % by weight of at least one fatty acid selected from the group consisting of fatty acids containing from about 12 to 48 carbon atoms. The compositions are solid at 20 °C, but start to become fluid between about 50 °C to 95 °C.

L'invention concerne des compositions à base de cire thermofusible qui confèrent à des produits fibreux tels que les récipients en papier, en carton et en papier ondulé une étanchéité à température ambiante, tout en permettant la désintégration et le recyclage de ces articles, les articles en papier enduits étant désintégrés dans un milieu aqueux chauffé, pratiquement neutre aux alcalis. Les compositions contiennent en poids environ 20 à 97,5 % de cire hydrofuge, solide à 20 DEG C; environ 2,5 à 50 % d'un polymère d'addition d'environ 50 à 95 mole % d'un acide éthylène-1,2- dicarboxylique ou anhydride et environ 5 à 50 mole % d'au moins un monomère supplémentaire à insaturation éthylénique choisi dans le groupe composé de 1-alcènes comprenant chacun entre environ 4 et 60 atomes de carbone, où le polymère est dispersible dans la cire hydrofuge; entre environ 1 et 90 mole % des groupes carboxyle contenus dans le polymère peuvent être à nouveau modifiés par réaction avec un monoalcool ou une monoamine substitué(e) ou non substitué(e); et facultativement entre environ 5 et 75 % en poids d'au moins un acide gras choisi dans le groupe composé d'acides gras contenant entre environ 12 et 48 atomes de carbone. Le point de solidification des ces compositions est 20 DEG C, mais elles commencent à devenir fluides à une température comprise entre environ 50 DEG et 90 DEG C.

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