Viscosity-modified lactide polymer composition and process...

C - Chemistry – Metallurgy – 08 – L

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C08L 67/04 (2006.01) C08G 63/08 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2168041

A composition comprising a polylactide polymer with improved extensional viscosity and methods of making the same are disclosed. The polylactide polymer composition is prepared by providing in the composition polylactide polymer molecules which have been modified, relative to linear non-substituted polylactide, to provide increased molecular interaction among polylactide backbone chains in the composition. The preferred polylactide polymer composition has a number average molecular weight of at least about 10,000 (preferably at least 50,000) and a polydispersity of at least about 2.5. In addition, the polylactide polymer composition should have a neck-in ratio of less than about 0.8.

L'invention concerne une composition comprenant un polymère de polylactide présentant une viscosité améliorée à l'extension, ainsi que des procédés de fabrication de ladite composition. On prépare cette composition polymère de polylactide par apport dans ladite composition de molécules de polymère de polylactide qui ont subi une modification par rapport à un polylactide linéaire non substitué, de façon à amplifier l'interaction moléculaire parmi les chaînes de squelette de polylactide dans la composition. La composition préférée de polymère de polylactide possède un poids moléculaire moyen d'au moins environ 10 000 (de préférence, au moins 50 000) et une polydispersivité d'au moins environ 2,5. De plus, cette composition polymère de polylactide est susceptible de présenter un rapport de rétrécissement à l'extension inférieur à environ 0,8.

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