Propylene copolymer compositions

Details Propylene copolymer compositions Propylene copolymer compositions

C - Chemistry, Metallurgy

08

L

C08L 23/10 (2006.01) C08K 5/00 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2623897

Gamma irradiation resistant propylene/ethylene copolymer compositions are provided comprising: i) a propylene/ethylene copolymer comprising from about 2 to about 3.5 wt. % ethylene; ii) from about 800 ppm to about 1200 ppm of one or more light stabilizers; iii) from about 300 ppm to about 1200 ppm of one or more acid scavengers; iv) from about 1600 ppm to about 2200 ppm of aluminum, hydroxybis[2,4,8, 10 tetrakis (l,l-dimethyl(ethyl)-6-hydroxy-12H dibenzo[d,g][l,3,2] dioxaphoshocin 6- oxidato]; and v) a sufficient amount of one of more viscosity modifiers to break down the resulting polymer viscosity to a melt index from about 23 to about 31 g/10 minutes measured at about 230~C/2160g.

L'invention concerne des compositions copolymères de propylène/éthylène résistantes à l'irradiation gamma, comprenant : i) un copolymère de propylène/éthylène comprenant entre environ 2 et environ 3,5 % en poids d'éthylène ; ii) entre environ 800 ppm et environ 1200 ppm d'un ou de plusieurs photostabilisants ; iii) entre environ 300 ppm et environ 1200 ppm d'un ou de plusieurs capteurs d'acide ; iv) entre environ 1600 ppm et environ 2200 ppm d'aluminium, hydroxybis[2,4,8, 10 tétrakis (l,l-diméthyl(éthyl)-6-hydroxy-12H dibenzo[d,g][l,3,2] dioxaphoshocin 6-oxidato] ; et v) une quantité suffisante d'un ou de plusieurs modificateurs de viscosité pour réduire la viscosité du polymère obtenu à un indice de fusion compris entre environ 23 et environ 31 g/10 minutes mesuré à environ 230 °C/2160g.

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