Composition of poly-arylene ether ketone ketone powders suitable for laser sintering
AssigneeArkema France
InventorsNadine DECRAEMER, Denis HUZE, Cyrille MATHIEU, Herve STER, Jerome PASCAL, Benoit BRULE
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Abstract
The present invention relates to a composition comprising at least one poly(arylene ether ketone) powder suitable for laser sintering and also to the process which makes it possible to obtain it, minimizing the amount by weight of remaining non-sintered powder after production of the part by sintering.
Claims8
A composition comprising a PEKK powder, the tapped density of which is less than 400 kg/m3, limit included, measured according to ISO 1068-1975 (F), and the flowability of which exhibits a passage time in a 12 mm funnel of less than 50 s, limit included, or a passage time in a 17 mm funnel of less than 30 s.
A heat treatment process for preparing a PEKK powder the tapped density of which is less than 400 kg/m3 limit included, measured according to ISO 1068-1975 (F), and the flowability of which exhibits a passage time in a 12 mm funnel of less than 50 s, limit included, or a passage time in a 17 mm funnel of less than 30 s, the process comprising the following stages:
- arranging a PEKK powder in a ventilated chamber in a static or dynamic device;
- heating the PEKK powder at a temperature between T−10° C. and T+10° C., where T=3.75*A+37.5, expressed in ° C., A representing the percentage by weight of terephthalic unit with respect to the sum of the terephthalic and isophthalic units and is between 55% and 85%, for a time of greater than 2 minutes.
Dependencies are inferred from the claim text.