US 11,718,045 B2
Method for increasing the difference between the melting temperature and the crystallization temperature of a polyamide powder
Gregory Filou, Manneville sur Risle (FR); Cyrille Mathieu, Lyons (FR); and Holger Senff, Lescar (FR)
Assigned to ARKEMA FRANCE, Colombes (FR)
Filed by Arkema France, Colombes (FR)
Filed on Nov. 3, 2020, as Appl. No. 17/88,033.
Application 17/088,033 is a continuation of application No. 15/977,428, filed on May 11, 2018, granted, now 10,836,117.
Application 15/977,428 is a continuation of application No. 12/990,301, abandoned, previously published as PCT/FR2009/050788, filed on Apr. 29, 2009.
Claims priority of application No. 0852863 (FR), filed on Apr. 29, 2008.
Prior Publication US 2021/0107235 A1, Apr. 15, 2021
Int. Cl. C08G 69/26 (2006.01); B29C 67/04 (2017.01); C08G 69/04 (2006.01); C08G 69/08 (2006.01); C08G 69/16 (2006.01); C08G 69/28 (2006.01); C08G 69/44 (2006.01); C08J 3/12 (2006.01); C08J 3/28 (2006.01); B29C 64/153 (2017.01); C08J 3/14 (2006.01); B29K 77/00 (2006.01)
CPC B29C 67/04 (2013.01) [B29C 64/153 (2017.08); C08G 69/04 (2013.01); C08G 69/08 (2013.01); C08G 69/16 (2013.01); C08G 69/26 (2013.01); C08G 69/28 (2013.01); C08G 69/44 (2013.01); C08J 3/12 (2013.01); C08J 3/14 (2013.01); C08J 3/28 (2013.01); B29K 2077/00 (2013.01)] 21 Claims
 
1. A process for reducing the crystallization temperature and the melting temperature of a polyamide powder derived from the polymerization of at least one major monomer, said process comprising polymerization of said at least one major monomer with at least one different minor comonomer polymerized according to the same polymerization process as said at least one major monomer, said at least one minor comonomer representing from 0.1% to 20% by mass of the total blend of said monomer(s) and comonomer(s), such that the reduction in the crystallization temperature is greater than the reduction in the melting temperature, relative to the crystallization temperature and the melting temperature of the polyamide obtained from the polymerization of said at least one major monomer alone,
wherein the change in the crystallization temperature is at least 3° C.