Polyethylene compositions for rotational molding

Details Polyethylene compositions for rotational molding Polyethylene compositions for rotational molding

C - Chemistry, Metallurgy

08

L

C08L 23/08 (2006.01) B29C 41/04 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2498087

Polyethylene blend compositions suitable for rotomolding, rotomolded articles, and processes for rotomolding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.4 to 3.0 g/10 min and a density of from 0.910 to 0.930 g/cm3; and a second polyethylene having a melt index of 10 to 30 g/10 min and a density of 0.945 to 0.975 g/cm3. The composition has a density of from 0.930 to 0.955 g/cm3 and a melt index of 1.5 to 12 g/10 min, and the first and second polyethylenes differ in density by from 0.030 to 0.048 g/cm3. These compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance and Izod Impact Strength.

L'invention concerne des compositions à base de mélanges de polyéthylène convenant au moulage par rotation, des articles moulés par rotation, ainsi que des procédés de moulage par rotation d'articles. Ces compositions de polyéthylène comprennent un premier polyéthylène ayant un indice de fluidité compris entre 0,4 et 3,0 g/10 min. et une densité comprise entre 0,910 et 0,930 g/cm?3¿ et un second polyéthylène ayant un indice de fluidité compris entre 10 et 30 g/10 min. et une densité comprise entre 0,945 et 0,975 g/cm?3¿. Cette composition a une densité comprise entre 0,930 et 0,955 g/cm?3¿ et un indice de fluidité compris entre 1,5 et 12 g/10 min., le premier et le second polyéthylène ayant une différence de densité comprise entre 0,030 et 0,048 g/cm?3¿. Ces compositions présentent des propriétés physiques améliorée, à savoir une plus grande résistance aux fissures de contrainte en milieu solvant et une plus grande résistance aux chocs Izod.

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