Thermoplastic articles and processes for making the same...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/10 (2006.01) C08J 3/22 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2656615

The present invention is directed to improve processes for making plastic articles, and articles made therefrom. In a broad aspect, the invention is directed to improved processes and articles made therefrom, that include the steps of providing as separate materials a first material that includes a polyolefin, a second material including an admixture of from about 45 to 85 wt.% of the total admixture of at least one particulated mineral filler; and from about 15 to 55 wt.% of the total admixture of at least a second polyolefin having a melt index greater than about 150 g/10min at 190°C/2.16kg, as measured per ISO 1133 (condition D); applying a shear force to form a molten blend; shaping the molten blend and solidifying the molten blend.

La présente invention a pour objet d'améliorer le procédé de fabrication d'articles en plastique, et par conséquent les articles ainsi fabriqués. Selon un aspect général, cette invention vise à l'obtention de procédés et par conséquent d'articles améliorés. Elle inclut les étapes suivantes : mise à disposition de deux matériaux séparés, un premier matériau comprenant une polyoléfine et un second matériau comprenant un adjuvant pour une importance d'environ 45 à 85% en poids par rapport à l'ensemble de l'adjuvant d'au moins une charge minérale particulaire, et d'environ 15 à 55% en poids par rapport à l'ensemble de l'adjuvant d'au moins une seconde polyoléfine possédant un indice de fusion supérieur à 150 g/10 minutes à 190°C-2,16 kg ainsi que mesuré selon la norme ISO 1133 (condition D), puis application d'un effort de cisaillement jusqu'à formation d'un mélange fondu, et enfin mise en forme et solidification du mélange fondu.

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