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AssigneeDsm N.V.
InventorsCornelis E. Koning, Gerardus J. M. De Koning, Jeroen J. Crevecoeur
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The invention relates to a polyamide composition with improved flow behavior that comprises at least 80-99.5 wt. % of a high-molecular polyamide and 0.5-20 wt. % of a polyamide oligomer that has a melting point that is higher than the melting point of the high-molecular polyamide, the amounts being relative to the total weight of the polyamide present in the composition. The high-molecular polyamide is preferably PA-6 or PA-4,6/6 copolymer and the polyamide oligomer is preferably chosen from the group comprising PA-6,6, PA-4,6, PA-4,6/6 copolyamide or copolyamides or mixtures thereof. The invention also relates to a process for improving the flow behavior of a high-molecular polyamide composition by melt-mixing a high-molecular polyamide and a polyamide oligomer having a melting point that is higher than the melting point of the high-molecular polyamide at a melt temperature that is equal to or lower than the melting point of the polyamide oligomer and also a high-molecular polyamide composition obtainable with this process.
Polyamide composition comprising at least 80-99.5 wt. % of a high-molecular polyamide having a weight-average molecular weight of at least 10,000 g/mol and 0.5-20 wt. % of a low molecular weight polyamide having a weight-average molecular weight of at most 5,000 g/mol and having a melting point that is higher than the melting point of the high-molecular polyamide, the amounts being relative to the total weight of the polyamide present in the composition.
Process for improving the flow behaviour of a high-molecular polyamide composition by melt-mixing a high-molecular polyamide having a weight-average molecular weight of at least 10,000 g/mol and a low-molecular polyamide having a weight-average molecular weight of at most 5,000 g/mol and having a melting point that is higher than the melting point of the high-molecular polyamide at a melt temperature that is equal to or lower than the melting point of the low-molecular polyamide.
Dependencies are inferred from the claim text.