C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 3/12 (2006.01) B29C 67/00 (2006.01) B29C 67/04 (2006.01) C08G 69/04 (2006.01) C08G 69/08 (2006.01) C08G 69/16 (2006.01) C08G 69/26 (2006.01) C08G 69/28 (2006.01) C08G 69/44 (2006.01) C08J 3/28 (2006.01)
Patent
CA 2720284
The present invention relates to a method for reducing the crystallization temperature and the melting temperature of a polyamide powder resulting from the polymerization of at least one predominant monomer, in which the reduction in the crystallization temperature is greater than the reduction in the melting temperature, said method comprising a step of polymerization of said at least one predominant monomer with at least one different minor comonomer polymerized according to the same polymerization process as said at least one predominant monomer, said at least one minor comonomer being chosen from aminocarboxylic acids, diamine/diacid pairs, lactams and/or lactones, and said at least one minor comonomer representing from 0.1% to 20% by weight of the total blend of said monomer(s) and comonomer(s), preferably from 0.5% to 15% by weight of said total blend, preferably from 1% to 10% by weight of said total blend.
La présente invention concerne un procédé pour diminuer la température de cristallisation et la température de fusion d'une poudre de polyamide issu de la polymérisation d'au moins un monomère majoritaire, dans lequel la diminution de la température de cristallisation est supérieure à la diminution de la température de fusion, ledit procédé comprenant une étape de polymérisation dudit au moins un monomère majoritaire avec au moins un co- monomère différent minoritaire polymérisé selon le même processus de polymérisation que ledit au moins un monomère majoritaire, ledit au moins un co-monomère minoritaire étant choisi parmi les acides aminocarboxyliques, les couples diamine.diacide, les lactames et/ ou les lactones, et ledit au moins un comonomère minoritaire représentant de 0.1% à 20% en masse du mélange total desdits monomère(s) et co-monomère(s), de préférence de 0.5% à 15% en masse dudit mélange total, de préférence de 1% à 10% en masse dudit mélange total.
Filou Gregory
Mathieu Cyrille
Senff Holger
Arkema France
Robic
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