Polycarbonate resin composition, pellets thereof and molded...

C - Chemistry – Metallurgy – 08 – L

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Details

C08L 69/00 (2006.01) C08K 5/103 (2006.01)

Patent

CA 2452455

The object of the present invention is to provide a polycarbonate resin composition which has excellent transparency and durability against molding heat, which gives a molded article having an excellent mold release property, reduced strains, improved cracking resistance and, preferably, weatherability, and which is particularly suitable for a transparent member for a vehicle, pellets thereof and a molded article thereof, and the present invention provides a polycarbonate resin composition obtained by blending 100 parts by weight of a polycarbonate resin (Component A) and 0.005 to 2 parts by weight of a full ester (Component B) from an aliphatic polyhydric alcohol having 4 to 8 hydroxyl groups and 5 to 30 carbon atoms and an aliphatic carboxylic acid having 10 to 22 carbon atoms, said Component B having a 5 % weight loss temperature, measured by TGA (thermogravimetric analysis), of 250 to 360° C and having an acid value of 4 to 20, pellets thereof and a molded article thereof.

La présente invention concerne une composition de résine polycarbonate qui présente des caractéristiques satisfaisantes de transparence et de résistance à la chaleur de moulage, qui permet d'obtenir un article moulé doté de caractéristiques de libération satisfaisantes, d'une contrainte propre réduite et d'une résistance améliorée à la fissuration, et doté en outre de préférence d'une bonne tenue aux intempéries. Cette composition s'avère particulièrement utile pour la production d'éléments transparents destinés à des véhicules. La composition de résine polycarbonate de l'invention comprend 100 parts en poids d'une résine polycarbonate (ingrédient A) et 0,005 à 2 parts en poids d'un ester (ingrédient B) obtenu par estérification totale d'un alcool aliphatique C¿5-30 ?tétra- à octavalent avec un acide carboxylique aliphatique C¿10-22?. Cette composition se caractérise en ce que l'ingrédient B possède une température de perte en poids de 5 % dans une analyse thermogravimétrique (TGA) comprise entre 250 et 360· C ainsi qu'une valeur acide comprise entre 4 et 20.

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