Preparation of ultrapure polymeric articles

C - Chemistry – Metallurgy – 08 – F

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C08F 6/00 (2006.01) B01D 11/02 (2006.01) C08F 6/28 (2006.01)

Patent

CA 2575987

Ultrapure olefinic polymeric articles of manufacture can be prepared by a process comprising: providing olefinic polymeric material containing impurities, subjecting the olefinic polymeric material to supercritical CO2 at a pressure of at least about 4000 psi (281.23 kg/cm2) at a temperature of from about 35~ C and above, to extract the impurities from the olefinic polymeric material and produce ultrapure olefinic polymeric material, and molding ultrapure articles of manufacture from the ultrapure, olefinic polymeric material.

Cette invention a pour objet des articles à base de polymère oléfinique ultrapur de fabrication qui peuvent être préparés en utilisant un procédé comprenant les éléments suivants : fournir la matière à base de polymère oléfinique contenant des impuretés, soumettre la matière à base de polymère oléfinique à un CO2 supercritique à une pression de 4000 psi environ (281,23 kg/cm2) au moins à une température de 35°C environ ou plus, pour extraire les impuretés de la matière à base de polymère oléfinique et produire de la matière à base de polymère oléfinique ultrapur, et procéder au moulage d'articles ultrapurs de fabrication à partir de la matière à base de polymère oléfinique ultrapur.

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