Polymer composition for bottle screw caps

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 101/00 (2006.01) B65D 41/00 (2006.01) C08J 3/20 (2006.01) C08K 3/00 (2006.01) C08K 5/00 (2006.01) C08L 23/04 (2006.01) C08L 91/06 (2006.01)

Patent

CA 2352301

The present invention relates to a polymer composition, especially used for manufacturing screw caps intended for drinks bottles, which are easy to unscrew and at the same time avoid transmitting a taste and/or a smell to the drinks contained in the bottles. The composition essentially comprises (1) a polymer, except a polymer based on a conjugated diene, (2) at least one stabilizer and (3) at least one additive in an amount from 0.01 to 1% by weight, chosen from (a) natural, modified or refined, lignite waxes or montan waxes, (b) polyolefin-based or paraffin-based polar waxes, and (c) refractory or metal oxides grafted by polar organic compounds.

La présente invention concerne une composition polymère, utilisée spécifiquement pour la fabrication de capsules à vis destinées à des bouteilles de boissons, qui sont faciles à dévisser et qui, en même temps, ne transmettent pas de goût et/ni d'odeur aux boissons contenues dans les bouteilles. La composition comprend pour l'essentiel: (1) un polymère, à l'exception d'un polymère à base de diène conjugué,(2) au moins un stabilisant et (3) au moins un additif à raison de 0,01 à 1 % du poids de ladite composition, choisi dans (a) des cires de lignite naturelles, modifiées ou raffinées, (b) des cires polaires à base de polyoléfine ou de paraffine, et (c) des oxydes métalliques ou réfractaires greffés par des composés organiques polaires.

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