Method for producing polyamide comprising amide-based molecular weight modifier, and polyamide produced thereby
AssigneeHanwha Solutions Corporation
InventorsKyung Ho Kwon, Seung Hoe Do, Jin Seo Lee, Dae Hak Kim, Kyoung Won Yim, Do Kyoung Kim, Hye Yeon Lee
Life of this patent
Estimating the term…
Abstract
Provided are a method for producing a polyamide including an amide-based molecular weight controller and a polyamide produced thereby, wherein the amide-based molecular weight controller may easily control the molecular weight of the polyamide to have a narrow molecular weight distribution so as to prevent an increase in the molecular weight due to a basic intermediate produced in anionic polymerization and a side reaction generated under a high-temperature polymerization condition.
Claims6
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.
Dependencies are inferred from the claim text.