Additives for use in polymer processing and methods of...

C - Chemistry – Metallurgy – 08 – K

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C08K 3/34 (2006.01)

Patent

CA 2536493

Compositions comprising a polymeric liquid and a viscosity modifier comprising a solid material active in lowering the viscosity of the polymeric liquid. The solid material has a particle size of about 75 microns equivalent spherical diameter and is present at a concentration of up to about 2 % by weight of the composition. The solid material can act by lowering the viscosity of the polymeric liquid at stress amplitudes and strain rates where a linear relation exists between stress amplitude and strain rate, and by lowering the viscosity of the polymeric liquid at stress amplitudes and strain rates approaching and exceeding the critical stress value of the polymeric liquid. Methods of preparing and using the compositions, and methods of selecting the solid material, are presented.

La présente invention concerne des compositions contenant un liquide polymère et un modificateur de viscosité qui comprend un matériau solide capable de réduire la viscosité du liquide polymère. Le matériau solide présente une granulométrie d'environ 75 microns en diamètre sphérique équivalent et sa concentration est supérieure à environ 2 % en poids de la composition. Le matériau solide peut agir par réduction de la viscosité du liquide polymère à des amplitudes de contrainte et à des vitesses de déformation, lorsqu'il existe une relation linéaire entre l'amplitude de contrainte et la vitesse de déformation, et par réduction de la viscosité du liquide polymère à des amplitudes de contrainte et à des vitesses de déformation proches ou supérieures à la valeur de contrainte critique du liquide polymère. Cette invention concerne également des procédés permettant de préparer et d'utiliser ces compositions, ainsi que des procédés permettant de choisir le matériau solide.

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