Polyester-series resin composition and molded article

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/00 (2006.01) C08G 63/91 (2006.01) C08K 5/09 (2006.01) C08K 5/29 (2006.01) C08K 5/521 (2006.01) C08K 5/57 (2006.01) C08L 63/00 (2006.01) C08L 79/00 (2006.01)

Patent

CA 2647134

Disclosed is a polyester resin composition composed of a polyester block copolymer (A), a polyfunctional epoxy compound (B) and a polycarbodiimide compound (C). The polyester block copolymer (A) is obtained by a reaction among a crystalline aromatic polyester (a1), a lactone (a2), and if necessary, at least one compound (a3) selected from polycarboxylic acids, polyols and their ester-forming derivatives, in the presence of an acidic phosphate and a tin compound. This polyester resin composition is especially excellent in recycling property (or heat cycle resistance), and is thus useful for blow molding.

L'invention concerne une composition de résine de polyester composée d'un copolymère bloc de polyester (A), d'un composé d'époxy polyfonctionnel (B) et d'un composé de polycarbodiimide (C). Le copolymère bloc de polyester (A) est obtenu par une réaction entre un polyester aromatique cristallin (a1), une lactone (a2), et si nécessaire, au moins un composé (a3) choisi parmi les acides polycarboxyliques, les polyols et leurs dérivés formateurs d'ester, en présence d'un phosphate acide et d'un composé d'étain. Cette composition de résine de polyester est notamment excellente en ce qui concerne ses propriétés de recyclage (ou résistance au cycle de traitement thermique), et est donc utile pour le moulage par extrusion-soufflage.

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