Carbonate polymer compositions comprising low volatile uv...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 69/00 (2006.01) C08K 5/00 (2006.01) C08K 5/13 (2006.01) C08K 5/15 (2006.01) C08K 5/34 (2006.01) C08K 5/3475 (2006.01) C08K 5/3492 (2006.01) C08K 5/526 (2006.01)

Patent

CA 2405835

Improved carbonate polymer compositions are prepared comprising specific amounts of one or more UV absorbing compounds having a molecular weight of at least 400 g/mol selected from a hydroxybenzotriazole derivative, a hydroxyphenyltriazine derivative, or mixtures thereof; a phosphite type stabilizer; a hindered phenol type stabilizer; and a lactone type stabilizer. The carbonate polymer compositions according to the invention can be used to prepare molded, shaped or otherwise fabricated articles having improved combinations of protection against UV radiation, color and color stability with reduced plate-out behavior during processing. The compositions are especially suitable for use in extrusion, blow molding, thermoforming, and injection molding.

Selon l'invention, des compositions améliorées à base de polymère de carbonate sont préparées de façon à comprendre des quantités spécifiques d'un ou de plusieurs composés à absorbance UV présentant un poids moléculaire d'au moins 400 g/mol et sélectionnés parmi un dérivé d'hydroxybenzotriazole, un dérivé d'hydroxyphényltriazine, ou leurs mélanges; un stabilisant de type phosphite; un stabilisant phénolique empêché; et un stabilisant de type lactone. Les compositions à base de polymère de carbonate peuvent être utilisées pour préparer des articles moulés, formés ou autrement fabriqués combinant les propriétés améliorés de protection contre les rayons, la couleur et la stabilité de la couleur UV, avec un comportement de dépôt réduit pendant le traitement. Les compositions de l'invention conviennent particulièrement dans des applications d'extrusion, de moulage par soufflage, de thermoformage ou de moulage par injection.

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