Polycarbonate for making extruded films that are virtually...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 64/40 (2006.01)

Patent

CA 2668176

Linear polycarbonate resin virtually free of surface defects that impair the suitability of the resin for demanding optical application is disclosed. Also disclosed is a process for the manufacture of the resin. The surface defects included in the resin are in the form of transparent fluorescing particles, the particle count of which portion that are 15 and 250 µm in size, is up to 1.8 counts/g, said count being determined by exciting the residue remaining after filtering a solution of said polycarbonate in methylene chloride through a Teflon filter of 5 µm pore size at a wavelength of 400- 440 nm, 25x overall magnification and illumination time of 40 millisec. The polycarbonate is suitable for making films of improved optical properties.

L'invention porte sur une résine de polycarbonate linéaire pratiquement exempte de défauts de surface affectant le caractère approprié de la résine pour une application optique exigeante. L'invention porte également sur un procédé de fabrication de la résine. Les défauts de surface inclus dans la résine sont sous forme de particules fluorescentes transparentes, le comptage de la fraction de particules ayant une dimension de 15 à 250 µm, allant jusqu'à un 1,8 comptage/g, ledit comptage étant déterminé par excitation du résidu restant après filtration d'une solution dudit polycarbonate dans le chlorure de méthylène à travers un filtre de Téflon d'une dimension de pore de 5 µm à une longueur d'onde de 400 - 440 nm, un grossissement global de 25x et un temps d'éclairage de 40 millisecondes. Le polycarbonate est approprié pour fabriquer des films de propriétés optiques améliorées.

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