Polymer processing additive having improved stability

Details Polymer processing additive having improved stability Polymer processing additive having improved stability

C - Chemistry, Metallurgy

08

L

C08L 71/02 (2006.01) C08J 3/20 (2006.01) C08K 3/22 (2006.01) C08K 5/13 (2006.01) C08K 5/1535 (2006.01) C08K 5/49 (2006.01) C08L 27/12 (2006.01)

Patent

CA 2321776

The extrusion of polymeric materials, especially thermoplastic polymeric materials, requires a number of physical attributes in the polymer to be controlled during extrusion to effect desirable surface characteristics on the extruded polymer. Extrusion additives have been provided for the improvement of these attributes and characteristics. The present invention describes an additive system for extrudable thermoplastic polymers, extrudable polymer compositions containing the additive system, and extrusion processes using polymers containing the additive system of this invention. The extrusion additive of the present invention comprises: (i) a fluorocarbon polymer, (ii) a poly(oxyalkylene) polymer, (iii) magnesium oxide, and (iv) optionally a stabilizer. The extrudable composition of the invention comprises: (A) an extrudable polymer (e.g., a predominant amount, such as at least 50 % by weight of solids), and (B) an effective amount of the stabilized processing aid (extrusion additive).

Dans l'extrusion de matières polymères, notamment de matières polymères thermoplastiques, il est nécessaire de maîtriser un certain nombre d'attributs physiques du polymère, de sorte que le polymère extrudé présente les caractéristiques de surfaces voulues. Des additifs d'extrusion ont été prévus pour l'amélioration de ces attributs et caractéristiques. L'invention concerne un système additif pour polymères thermoplastiques extrudables, des compositions polymères extrudables contenant ledit système additif, et des procédés d'extrusion dans lesquels des polymères contenant le système additif de l'invention sont utilisés. L'additif d'extrusion de l'invention se compose de: (i) un polymère fluorocarboné, (ii) un polymère de poly(oxyalkylène), (iii) oxyde de magnésium, et (iv) éventuellement un stabilisant. La composition extrudable comprend: (A) un polymère extrudable (ex: une quantité prédominante de solides, comme au moins 50 % en poids), et (B) une quantité efficace d'adjuvant de traitement stabilisé (additif d'extrusion).

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