公开(公告)号：US20230407006A1

公开(公告)日：2023-12-21

申请号：US18251790

申请日：2021-11-10

Applicant: ARKEMA FRANCE

Inventor： Sébastien QUINEBECHE ,  Gérald ROMAZINI ,  Pierrick ROGER-DALBERT ,  Thierry BRIFFAUD

IPC: C08G69/10 ,  C08J3/21

CPC classification number: C08G69/10 ,  C08J3/212 ,  C08J2377/04

Abstract: A method for continuously preparing a formulated polyamide prepolymer, of which the solution viscosity is from 0.25 dL/g to 0.70 dL/g, as measured according to ISO 307:2007 in m-cresol at 20° C., the method including a step of polycondensation on the basis of one or more polyamide precursor monomers, said polycondensation step being carried out in an extruder comprising at least two co-rotating conveying screws, the at least one monomer being previously fed therein in solid or liquid form without being dissolved in a solvent or in water, and said polycondensation step being carried out without extraction of the water formed during said polycondensation step and comprising the addition of at least one additive during said polycondensation step in the extruder.

公开(公告)号：US20240263019A1

公开(公告)日：2024-08-08

申请号：US18248263

申请日：2021-10-08

Applicant: ARKEMA FRANCE

Inventor： Jean-Yves LOZE ,  Pierrick ROGER-DALBERT

IPC: C09D5/03 ,  B05D1/06 ,  C08J3/12 ,  C08J3/20 ,  C08J3/24 ,  C08K3/013 ,  C09D7/80 ,  C09D177/02

CPC classification number: C09D5/035 ,  B05D1/06 ,  C08J3/12 ,  C08J3/201 ,  C08J3/247 ,  C08K3/013 ,  C09D7/80 ,  C09D177/02 ,  B05D2202/00 ,  C08J2377/02

Abstract: A pigmented pulverulent composition based on polyamide for coating substrates, including: (a) 40% to 99% by weight of at least one polyamide, (b) 1% to 30% by weight of at least one pigment, and (c) 0% to 30% by weight of at least one additive, wherein the polyamide has an inherent viscosity, as measured using an Ubbelohde tube at 20° C. on a 0.5% by weight solution in m-cresol according to standard ISO 307 but with a measuring temperature of 20° C. rather than 25° C., of more than 0.7 (g/100 g)−1, and wherein the composition has a volume-median diameter Dv50, as measured according to standard ISO 9276—parts 1 to 6, of 10 to 200 μm. A process for manufacturing the composition, the use thereof for coating a—metallic—substrate, and an object comprising a metallic substrate coated with a coating obtained with the pigmented pulverulent composition based on polyamide.

公开(公告)号：US20230374217A1

公开(公告)日：2023-11-23

申请号：US18248259

申请日：2021-10-11

Applicant: ARKEMA FRANCE

Inventor： Pierrick ROGER-DALBERT ,  Jean-Yves LOZE ,  Eric LABONNE

IPC: C08G69/46 ,  C08G69/04 ,  C09D177/02 ,  C08G69/16

CPC classification number: C08G69/46 ,  C08G69/04 ,  C09D177/02 ,  C08G69/16

Abstract: The present invention relates to a process for preparing a powder composition based on polyamide(s) with an optimized yield. The process includes a step of recycling a composition based on a polyamide prepolymer having a lower Dv50, by polycondensation of a mixture comprising said composition and one or more monomers in the presence of water. The invention also relates to the powder composition obtained and to the use thereof, especially for coating metal substrates by fluidized bed dip-coating.