Improved resin compositions for extrusion coating

Details Improved resin compositions for extrusion coating Improved resin compositions for extrusion coating

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2536292

A composition is disclosed which is particularly suited for use in extrusion coating. The composition comprises a polymeric material having a rheology such that the slope S of a natural log-natural log plot of loss modulus (or G~) versus storage modulus (or G~) is greater than [0.635*(melt index)+13.2]/[(melt index)+16.6], and wherein the polymeric material has a CDF RI fraction less than 0.23 of a GPC chromatogram which has a molecular weight above 85,000 g/mol, and a CDF LS fraction of more than 0.07 at a conventional GPC molecular weight of 1,750,000 g/mol or greater. The compositions exhibit reduced neck-in when used in extrusion coating and the neck-in is independent of melt strength, thereby facilitating improved extrusion processes.

La présente invention concerne une composition qui convient particulièrement pour un revêtement par extrusion. Cette composition comprend un matériau polymère possédant une rhéologie telle que la pente S du tracé logarithme naturel du module de perte (ou G)-logarithme naturel du module de stockage (ou G') soit supérieur à [0.635?*¿(indice de fluidité)+13.2]/[(indice de fluidité)+16.6], et ce matériau polymère possède une fraction CDF RI < 0,23 d'un chromatogramme GPC qui possède une masse moléculaire supérieure à 85000 g/mole et une fraction CDF LS > 0,07 à une masse moléculaire GPC classique de1.750.000 g/mole voire supérieure. Cette composition présente un rétreint réduit lorsqu'on l'utilise en revêtement par extrusion et ce rétreint est indépendant de la résistance à la fusion, ce qui facilite des processus d'extrusion améliorés.

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