Aliphatic polyester resin and process for producing the same

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/20 (2006.01) C08G 18/42 (2006.01) C08G 18/80 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2183737

An aliphatic polyester resin characterized in that the value of as defined by the following equation (1), indicative of the magnitude of elongation viscosity, is in the range of 1.5 to 8.0: = 1/0 ...(1), wherein 0 is the elongation viscosity at the turning point, while 1 is the one at that point where the strain has doubled that observed at the turning point, the turning point referring to the point where the linear domain (domain of minute deformation) of the elegongation viscosity turns into the nonlinear domain (domain of large deformation). The production process provides an aliphatic polyester resin having excellent processability and stability in molding work and good biodegradability.

L'invention concerne une résine polyester aliphatique caractérisée par une valeur ? telle que définie dans la formule ci-après (1), qui indique l'ordre de grandeur de la viscosité d'élongation et dont la gamme de valeurs va de 1,5 à 8,0: ? = ?¿1?/?¿0? ...(1). Dans ladite formule, ?¿0? est la viscosité d'élongation au point d'inflection, tandis que ?¿1? est la viscosité d'élongation au point ou la contrainte représente le double de celle qui est observée au point d'inflection; ce point est défini comme suit: point où le domaine linéaire (domaine de déformation minime) de la viscosité d'élongation se transforme en domaine non linéaire (domaine de déformation importante). Le procédé de fabrication considéré permet d'obtenir une résine polyester aliphatique offrant des possibilités de traitement et une stabilité excellentes pour les travaux de moulage et offrant aussi une biodégradabilité satisfaisante.

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