Phase change solvents for thermoplastic polymers

C - Chemistry – Metallurgy – 08 – K

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C08K 5/00 (2006.01) C08J 3/09 (2006.01) C08J 3/18 (2006.01) C08K 5/12 (2006.01)

Patent

CA 2489571

Phase change solvents for thermoplastic polymers to provide blended compositions. Above the phase change temperature of the solvent, the phase change solvent solubilizes or intimately mixes with the thermoplastic polymer. Below the phase change temperature of the solvent, the phase change solvent solidifies or crystallizes within the thermoplastic matrix. The phase change behavior of these materials produce blended compositions that exhibit lowered shear viscosity and lowered processing temperature without substantially compromising mechanical properties of the thermoplastic polymer. The present invention also relates to a method of improving the processability of a thermoplastic polymer using the phase change solvent.

L'invention concerne des solvants à changement de phase pour des polymères thermoplastiques, permettant d'obtenir des compositions mélangées. Ledit solvant, au-dessus de sa température de changement de phase, se solubilise ou se mélange intimement avec le polymère thermoplastique. Au-dessous de sa température de changement de phase, il se solidifie ou se cristallise dans la matrice thermoplastique. Les propriétés de changement de phase de ces matériaux permettent d'obtenir des compositions mélangées qui présentent une viscosité de cisaillement et une température de mise en oeuvre réduites, sans que les propriétés mécaniques du polymère thermoplastique ne soient pour autant sensiblement affectées. L'invention concerne également un procédé pour améliorer l'aptitude à la mise en oeuvre d'un polymère thermoplastique au moyen dudit solvant à changement de phase.

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