Method for the thermal treatment of poly-arylene ether ketone ketone powders suitable for laser sintering

Patent metadata

Field	Value
Publication number	US-2018148572-A1
Application number	US-201715830100-A
Country	US
Kind code	A1
Filing date	Dec 4, 2017
Priority date	May 30, 2013
Publication date	May 31, 2018
Grant date	—

Abstract

The invention relates to a process for the heat treatment of poly(arylene ether ketone ketone) powder suitable for laser sintering, and also to the powders resulting from this process.

First claim

1 . A process for the treatment of a powder comprising PEKK to obtain a treated powder, wherein the treated powder has a measured flowability exhibiting a passage time in a 17 mm funnel of less than 40 s, limit included, said flowability being measured in the following way:
a glass funnel with an orifice of 17 mm is filled with the treated powder up to 5 mm from the edge and the orifice of the bottom is blocked with a finger, the flow time of the treated powder is measured with a stopwatch, if flow does not take place, the funnel is tapped using a spatula, wherein the operation is repeated, if required, the flow time and the number of tapped blows using the spatula are recorded, the process comprising the following stages:
arranging the powder comprising PEKK in a ventilated chamber or any other heating system;
heating the powder comprising PEKK at a temperature of 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 of between 55% and 85%, and for a time strictly of less than 30 minutes.

2 . The process as claimed in claim 1 , wherein, in addition to the PEKK, the powder comprises a PEK, PEEKEK, PEEK or PEKEKK powder in proportions by weight such that the PEEK represents more than 50%.

3 . The process as claimed in claim 1 , wherein the powder additionally comprises a filler.

4 . The process as claimed in claim 1 , wherein the powder additionally comprises at least one additive.

5 . The process as claimed in claim 1 , wherein the ventilated chamber is a static oven.

6 . The process as claimed in claim 1 , wherein the ventilated chamber is a fluidized bed.

7 . The process as claimed in claim 1 , wherein the ventilated chamber is a tube in which hot air and the powder circulate countercurrentwise.

8 . The process as claimed in claim 5 , wherein the residence time is greater than 15 minutes but less than 30 minutes.

9 . The process as claimed in claim 6 , wherein the residence time is greater than 2 minutes but less than 30 minutes.

Assignees

• Arkema France

Inventors

• Decraemer Nadine
• Huze Denis
• Ster Hervé
• Pascal Jerome
• Brule Benoît

Classifications

• B29C67/04

  Sintering (combined with compression B29C43/00) · CPC title

• C08J3/124

  Treatment for improving the free-flowing characteristics · CPC title

• C08G65/40

  from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group · CPC title

• C08L61/16 Primary

  of ketones with phenols · CPC title

• B29K2071/00

  Use of polyethers {, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof}, as moulding material · CPC title