C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 101/00 (2006.01) C08G 83/00 (2006.01) C08L 77/00 (2006.01)
Patent
CA 2470216
The invention relates to thermoplastic compositions comprising a polymer matrix and an additive which modifies the rheological behaviour of the matrix in the molten state. The purpose of the invention is to provide a preferably non-reactive additive which can be dispersed in the matrix and which can be used to obtain a good compromise in terms of rheological properties/mechanical properties. According to the invention, the additive is a hyperbranched polymer which is functionalised by R?2¿ radicals, R?2¿ being a radical of the following type: substituted or non-substituted hydrocarbon, of the silicon type, linear or branched alkyl, aromatic, arylalkyl, alkylaryl or cycloaliphatic, which can comprise one or more unsaturations and/or one or more heteroatoms. Preferably, the composition does not contain hyperbranched polymers which produce therein a reduction in the molar mass of matrix M which is greater than or equal to 7 % in relation to a sample composition which comprises matrix M but which does not contain hyperbranched polymer additive(s). Said mass measurement is taken preferably using a predetermined protocol P. The invention is suitable for moulding, extrusion, engineered plastics, wires and fibres.
L'invention concerne des compositions thermoplastiques comprenant une matrice polymère et un additif modificateur du comportement rhéologique de la matrice à l'état fondu. Le but est de trouver un additif de préférence non réactif, dispersible dans la matrice et apte à procurer un bon compromis propriétés rhéologiques/propriétés mécaniques. Selon l'invention, l'additif est un polymère hyperbranché fonctionnalisé par des radicaux R2 de type : hydrocarboné substitué ou non, du genre silicone, alkyle linéaire ou ramifié, aromatique, arylalkyle, alkylaryle ou cycloaliphatique pouvant comprendre une ou plusieurs insaturations et/ou un ou plusieurs hétéroatomes. Sont de préférence exclus les polymères hyperbranchés entraînant dans la composition une diminution de la masse molaire de la matrice M supérieure ou égale à 7% par rapport à une composition témoin comportant une matrice M et exempte d'additif(s) polymère hyperbranché, la mesure de masse étant de préférence effectuée selon un protocole P déterminé. Applications : moulage, extrusion, plastiques techniques, fils et fibres.
Clement Florence
Rochat Sandrine
Scherbakoff Natalia
Touraud Franck
Varlet Joel
Rhodianyl
Robic
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