Stabilization of polyolefins with liquid...

C - Chemistry – Metallurgy – 08 – K

Patent

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C08K 5/00 (2006.01)

Patent

CA 2615555

The present invention discloses a process for stabilizing polyolefin compositions against the deleterious effects of melt processing, heat aging and exposure to combustion products of natural gas, which process comprises incorporating or applying to a polyolefin an effective stabilizing amount of a tris(mono-alkyl)phenyl phosphite ester of the formula (I) or a mixture of phosphite esters of formula I, where each R is the same or different and is straight or branched chain alkyl of from 1 to 8 carbon atoms, and where said phosphite ester or phosphite ester mixture is in the liquid state at 25~C and 1 atm of pressure. Also disclosed is a stabilized composition comprising polyolefin and a present phosphite ester or phosphite ester mixture as well as certain mixtures of tris-(mono-alkyl)phenyl phosphite. The present liquid phosphite ester stabilizers are especially compatible with low density polyethylene.

La présente invention concerne un procédé de stabilisation de compositions polyoléfiniques contre les effets délétères d'un traitement à chaud, du vieillissement thermique et de l'exposition à des produits de combustion de gaz naturel, lequel procédé consiste à ajouter ou à appliquer à une polyoléfine une quantité stabilisante efficace d'un ester de tris(mono-alkyl)phényl phosphite de la formule (I) ou un mélange d'esters de phosphites de la formule (I), dans laquelle chaque R est identique ou différent et est un alkyle à chaîne droite ou ramifiée contenant 1 à 8 atomes de carbone, et où ledit ester de phosphite ou mélange d'esters de phosphites est à l'état liquide à 25 °C et 1 atm de pression. L'invention concerne également une composition stabilisée contenant une polyoléfine ainsi qu'un ester de phosphites ou un mélange d'esters de phosphites présent et certains mélanges de tris-(mono-alkyl)phényl phosphite. Les stabilisants ester de phosphites liquides sont particulièrement compatibles avec le polyéthylène basse densité.

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