US 12,215,194 B2
Method for producing polyamide comprising amide-based molecular weight modifier, and polyamide produced thereby
Kyung Ho Kwon, Daegu (KR); Seung Hoe Do, Daejeon (KR); Jin Seo Lee, Seongnam-si (KR); Dae Hak Kim, Seongnam-si (KR); Kyoung Won Yim, Gwangju (KR); Do Kyoung Kim, Busan (KR); and Hye Yeon Lee, Seoul (KR)
Assigned to HANWHA SOLUTIONS CORPORATION, Seoul (KR)
Appl. No. 16/767,406
Filed by HANWHA SOLUTIONS CORPORATION, Seoul (KR)
PCT Filed Oct. 30, 2018, PCT No. PCT/KR2018/012972
§ 371(c)(1), (2) Date May 27, 2020,
PCT Pub. No. WO2019/107758, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 10-2017-0160742 (KR), filed on Nov. 28, 2017.
Prior Publication US 2020/0385521 A1, Dec. 10, 2020
Int. Cl. C08G 69/20 (2006.01)
CPC C08G 69/20 (2013.01) 6 Claims
OG exemplary drawing
 
1. A method for producing a polyamide by an anionic polymerization reaction, said method comprising: subjecting lactam to an anionic ring-opening polymerization to produce a polyamide in the presence of, based on 100 parts by weight of the lactam:
0.01 parts by weight to 20 parts by weight of an alkali metal-containing initiator,
0.5 parts by weight to 10 parts by weight of urea as a molecular weight controller, and
0.002 parts by weight to 7.0 parts by weight of carbon dioxide as an activator,
wherein the polyamide has a polydispersity index (PDI) of 3.0 or less.