Ethylene copolymer composition and use thereof

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/08 (2006.01) C08F 4/642 (2006.01) C08F 210/16 (2006.01) C08J 5/18 (2006.01) C08J 9/04 (2006.01) C08L 23/06 (2006.01) D01F 6/30 (2006.01) H01B 3/44 (2006.01) H01B 7/18 (2006.01)

Patent

CA 2288686

The present invention is intended to obtain an ethylene copolymer composition having excellent transparency, mechanical strength and moldability. The ethylene copolymer composition comprises an ethylene/ .alpha.-olefin copolymer and high-pressure radical process low-density polyethylene. The ethylene/.alpha.-olefin copolymer is a copolymer of ethylene and an .alpha.-olefin of 6 to 8 carbon atoms and has the following properties: the melt tension (MT) and the melt flow rate (MFR) satisfy the relation 9.0×MFR-0.55 > MT > 2.2×MFR-0.84; the activation energy ((E a)×10 -4 J/molK) of flow, the carbon atom number (C) of the .alpha.-olefin in the copolymer and the .alpha.-olefin content (x mol%) in the copolymer satisfy the relation (0.039Ln(C-2)+0.0096) × x+2.87 < E a×10 -4 <= (0.039Ln(C-2)+0.1660) × x+2.87; and the haze of an inflation film produced from said copolymer satisfies a specific relation. This ethylene copolymer composition can be used for producing molded products such as films, sheets, packaging materials, injection molded products, expansion molded products and fibers. These molded products are excellent in mechanical strength, heat resistance or transparency.

On décrit une composition de copolymère d'éthylène qui présente d'excellentes caractéristiques de transparence, de résistance mécanique et d'aptitude au moulage. La composition contient: un copolymère d'éthylène/alpha-oléfine C6-8 dans lequel la tension de la fonte (TF) et la vitesse d'écoulement de la fonte (VEF) correspondent à la relation 9,0 x VEF <-0,65> > TF>2,2 x VEF<-0,84> et l'énergie d'activation de l'écoulement est égale à ((Ea) x 10<-4> J/molK), le nombre d'atomes de carbone de l'alpha-oléfine dans le copolymère (C) et la teneur en alpha-oléfine du copolymère (x mol%) correspondent à la relation suivante (0,039 Ln(C-2)+0,0096) x x+2,87<Ea x 10<-4></=(0.039Ln(C-2) + 0,1660) x x+2,87, et qui, lorsqu'il est gonflé, produit un film ayant un trouble qui correspond à une relation spécifique; et un polyéthylène basse densité obtenu au moyen d'un procédé radical à haute pression. La composition peut être utilisée pour former des moules permettant de produire des films, des feuilles, des matières d'emballage, des moulages par injection, des moulages de mousse, et des fibres dont les qualités de résistance mécanique, de résistance à la chaleur et de transparence sont excellentes.

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