Solvay Polyolefins Europe-belgium

Solvay Pololefins Europe-belcium

Beno&icirc;t Koch

Michel Promel

Jiang Bian

Olivier Lhost

Jacques Breulet

Ethylene polymer having a blow-up ratio (R ) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI ) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different catalytic systems, the first based on titanium and zirconium used in a polymerization in two reactors; the second consisting of a mixture of a titanium catalyst and a titanium and zirconium catalyst, used in a polymerization in two reactors; the third based on chromium on a support comprising at least two constituents chosen from silica, alumina and aluminium phosphates, used in a polymerization in a single or in two reactors.

Ethylene polymer and processes for obtaining it

Copolymer of ethylene and of at least one alpha-olefin obtained by means of a catalytic solid base on chromium oxide deposited on an inorganic support, the said copolymer having a melt flow index HLMI, measured in g/10 min, an amount of alpha-olefin Q, pressed in g of alpha-olefin per kg of copolymer, a standard density SD, measured in kg/m,, at least equal to (952.75&plus;5.40&times;log HLMI&minus;0.79&times;Q) and a relatively broad molecular mass distribution, characterized by a ratio of the dynamic viscosities &mgr;,/&mgr;,at least equal to (23.67&minus;6.67&times;log HLMI).

Copolymer of ethylene and of at least one alpha-olefin and method for obtaining same

Ethylene polymer having a die swell ratio (R,) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI,) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different catalytic systems, the first based on titanium and zirconium used in a polymerization in two reactors; the second consisting of a mixture of a titanium catalyst and a titanium and zirconium catalyst, used in a polymerization in two reactors; the third based on chromium on a support comprising at least two constituents chosen from silica, alumina and aluminum phosphates, used in a polymerization in a single or in two reactors.

Growing community of inventors

Hannut, Belgium

Benoît Koch

Growing community of inventors

Hannut, Belgium

Beno&icirc;t Koch

Benoît Koch