Melt processed materials for medical articles

Details Melt processed materials for medical articles Melt processed materials for medical articles

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01)

Patent

CA 2709079

In accordance with an aspect of the invention, methods of forming medical articles are provided, which comprise (a) preparing a melt phase that comprises a molten polymer and a supercritical fluid, (b) forming a polymeric region from the melt phase, and (c) cooling the polymeric region. In certain embodiments, the supercritical fluid is formed from chemical species (e.g., C02, propane, etc.) that are gases at room temperature (25 C) and atmospheric pressure (1 atm). According to another aspect of the present invention, medical articles are provided which comprise melt-processed polymeric materials. The polymeric materials have a composition that cannot be melt processed without the use of melt-viscosity reducing additives due to thermal degradation, and yet the polymeric material does not contain such additives.

L'invention concerne des procédés de formation d'articles médicaux, qui comprennent (a) la préparation d'une phase fondue qui comprend un polymère fondu et un fluide supercritique, (b) la formation d'une région polymère à partir de la phase fondue, et (c) le refroidissement de la région polymère. Dans certains modes de réalisation, le fluide supercritique est formé à partir d'espèces chimiques (par exemple, CO2, propane, etc.) qui sont des gaz à température ambiante (25 °C) et à pression atmosphérique (1 atm). Selon un autre aspect de la présente invention, des articles médicaux qui comprennent les matériaux polymères traités en fusion sont fournis. Les matériaux polymères ont une composition qui ne peut pas être traitée à l'état fondu sans utiliser d'additifs réducteurs de viscosité en fusion en raison de la dégradation thermique, cependant le matériau polymère ne contient pas de tels additifs.

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