US 12,305,001 B2
Modified polyamide, method of preparing the same, and single component fiber
Po-Hsun Huang, New Taipei (TW); Wei-Hsiang Lin, New Taipei (TW); Ta Ko, New Taipei (TW); and Wei-Peng Lin, New Taipei (TW)
Assigned to TAIWAN TEXTILE RESEARCH INSTITUTE, New Taipei (TW)
Filed by TAIWAN TEXTILE RESEARCH INSTITUTE, New Taipei (TW)
Filed on Jan. 26, 2021, as Appl. No. 17/158,060.
Claims priority of application No. 109114053 (TW), filed on Apr. 27, 2020.
Prior Publication US 2021/0332187 A1, Oct. 28, 2021
Int. Cl. C08G 69/40 (2006.01); C08G 69/36 (2006.01); D01F 6/80 (2006.01)
CPC C08G 69/40 (2013.01) [C08G 69/36 (2013.01); D01F 6/80 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of preparing a spin drawn yarn single component fiber, comprising:
copolymerizing C4-C12 lactam, C4-C18 linear aliphatic dicarboxylic acid, polyetherdiamine, and diethylenetriamine (DETA) to form a modified polyamide, wherein the lactam is 80 to 95 parts by weight, and the linear aliphatic dicarboxylic acid is 1 to 4 parts by weight, and the polyetherdiamine is 4 to 16 parts by weight, and the diethylenetriamine is 0.2 to 0.6 parts by weight, wherein copolymerizing the C4-C12 lactam, the C4-C18 linear aliphatic dicarboxylic acid, the polyetherdiamine, and the diethylenetriamine comprises a first copolymerizing process and a second copolymerizing process, the first copolymerizing process is performed at a temperature of 200° C. to 240° C. and a pressure of 1.2 bar to 3 bar, and the second copolymerizing process is performed at a temperature of 240° C. to 270° C. and a pressure of 0.1 bar to 0.5 bar; and
performing a spinning process on the modified polyamide with a spinning speed of 2500 m/min, and a heating temperature between 260° C. and 280° C. to form the spin drawn yarn single component fiber.