C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/04 (2006.01) C08G 63/88 (2006.01)
Patent
CA 2162173
A polyester composition comprises at least one first semi-crystalline or crystallisable polyhydroxyalkanoate (PHA-X) and at least one second polyhydroxyalkanoate (PHA-Y) in semi-crystalline or crystalline form and having a higher crystalline melting point than said PHA-X. The PHA-Y is prepared by an annealing treatment in which the crystalline melting point is raised preferably by at least 5 °C compared to the PHA-X and preferably by at least 3 °C compared to the PHA-Y prior to the annealing treatment. The PHA-X and PHA-Y are preferably selected from polyhydroxybutyrate and polyhydroxybutyrate-co-valerate.
Une composition de polyester comprend au moins un premier polyhydroxyalcanoate cristallisable ou semi-cristallin (PHA-X) ainsi qu'au moins un second polyhydroxyalcanoate (PHA-Y) sous une forme cristalline ou semi-cristalline et présentant un point de fusion cristallin plus élevé que le PHA-X. On obtient le PHA-Y par un traitement de recuit au cours duquel le point de fusion cristallin est de préférence augmenté d'au moins 5 DEG C par rapport au PHA-X, et de préférence d'au moins 3 DEG C par rapport au PHA-Y avant le traitement de recuit. Le PHA-X et le PHA-Y sont de préférence choisis entre polyhydroxybutyrate et polyhydroxybutyrate-co-valérate.
Monsanto Company
Smart & Biggar
LandOfFree
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