US 12,168,717 B2
Semi-aromatic polyamide resin and preparation method therefor
Zhirong Chen, Zhejiang (CN); Hong Yin, Zhejiang (CN); Hangjun Deng, Zhejiang (CN); Guiyang Zhou, Zhejiang (CN); Danqi Zhu, Zhejiang (CN); Xiaoxiao Wu, Zhejiang (CN); Wengang Hong, Zhejiang (CN); Guisheng Qiu, Zhejiang (CN); and Qichuan Li, Zhejiang (CN)
Assigned to ZHEJIANG NHU SPECIAL MATERIALS CO., LTD., Zhejiang (CN); and ZHEJIANG NHU CO., LTD., Zhejiang (CN)
Appl. No. 17/416,587
Filed by ZHEJIANG NHU SPECIAL MATERIALS CO., LTD., Zheijang (CN); and ZHEJIANG NHU CO., LTD., Shaoxing (CN)
PCT Filed Nov. 20, 2019, PCT No. PCT/CN2019/119738
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/134735, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811601770.6 (CN), filed on Dec. 26, 2018.
Prior Publication US 2022/0025120 A1, Jan. 27, 2022
Int. Cl. C08G 69/48 (2006.01); C08G 69/26 (2006.01); C08G 69/28 (2006.01); C08L 77/06 (2006.01)
CPC C08G 69/48 (2013.01) [C08G 69/265 (2013.01); C08G 69/28 (2013.01); C08L 77/06 (2013.01)] 20 Claims
 
1. A semi-aromatic polyamide comprised of structural units derived from a diamine, a dibasic carboxylic acid and a mono carboxylic acid and end-capped structures derived from the following formula (I) and formula (II),
wherein the formula (I) is selected from compounds represented by the following formula (I-1) and/or formula (I-2):

OG Complex Work Unit Chemistry
wherein R1 is a carboxyl group, or a carboxyl-substituted C1-C10 alkyl group; R2 is a C1-C4 alkyl group or H; R3 is selected from a C6-C9 aryl group or H; n is 1 or 2 and corresponds to a cation of Mn+; and Mn+ is selected from +1- and +2-valent metal cations; the formula (II) is:

OG Complex Work Unit Chemistry
wherein R4 is selected from a C1-C10 alkyl group, and
wherein total phosphorus content in per unit mass of the semi-aromatic polyamide is not greater than 200 ppm.