Polyamide resin, preparation method therefor, and molded product including same

Patent metadata

Field	Value
Publication number	US-9359476-B2
Application number	US-201314655569-A
Country	US
Kind code	B2
Filing date	Mar 27, 2013
Priority date	Dec 28, 2012
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The polyamide resin of the present invention is a polyamide resin containing an amine group and a carboxyl group, wherein the amine group concentration is about 200 to 300 μeq/g and two to six times as high as the carboxyl group concentration. The polyamide resin has excellent long-thermal stability.

First claim

The invention claimed is:

1. A polyamide resin containing an amine group and a carboxyl group,
wherein the amine group is present at a concentration of about 200 to about 300 μeq/g, and
the concentration of the amine group is about 2 to about 6 times the concentration of the carboxyl group, and
tensile strength maintenance rate of the polyamide resin evaluated by compounding 35 parts by weight of a glass fiber (GF) with respect to 100 parts by weight of the polyamide resin is 45% or more.

2. The polyamide resin of claim 1 , wherein the polyamide resin is obtained by polymerizing (A) a dicarboxylic acid component comprising (a1) an aromatic dicarboxylic acid and (B) a diamine component comprising (b1) an aliphatic diamine.

3. The polyamide resin of claim 2 , wherein the aromatic dicarboxylic acid (a1) comprises at least one of aromatic dicarboxylic acids having 8 to 20 carbon atoms.

4. The polyamide resin of claim 2 , wherein the aliphatic diamine (b1) comprises at least one of aliphatic diamines having 4 to 20 carbon atoms.

5. The polyamide resin of claim 2 , wherein the dicarboxylic acid component (A) further comprises (a2) an amine group-containing dicarboxylic acid.

6. The polyamide resin of claim 5 , wherein the amine group-containing dicarboxylic acid (a2) is represented by the following Formula 1:

wherein R 1 is a hydrogen atom, or a hydrocarbon group having 1 to 10 carbon atoms, and R 2 is a linear, branched or cyclic hydrocarbon group having 1 to 20 carbon atoms, unsubstituted or substituted with a substituent selected from the group consisting of a C 1 -C 10 alkyl group, C 6 -C 18 aryl group, halogen, and a combination thereof.

7. The polyamide resin of claim 5 , wherein the dicarboxylic acid component (A) includes the amine group-containing dicarboxylic acid (a2) in an amount of about 0.1 to about 30 mol %, based on the total amount of the dicarboxylic acid component (A).

8. The polyamide resin of claim 1 , wherein the polyamide resin has an end group capped with an end capping agent comprising at least one of an aliphatic carboxylic acid and/or an aromatic carboxylic acid.

9. The polyamide resin of claim 1 , wherein the polyamide resin has an intrinsic viscosity of about 0.6 to about 1.5 dL/g, as measured in a 25° C. sulfuric acid solution using an Ubbelohde viscometer.

10. The polyamide resin of claim 1 , wherein the polyamide resin has a glass transition temperature (Tg) of about 120° C. or higher.

11. The polyamide resin of claim 1 , wherein the polyamide resin has a melting temperature (Tm) of about 280 to about 320° C., and a crystallization temperature (Tc) of about 260 to about 280° C.

12. A molded article comprising the polyamide resin defined in claim 1 .

13. A method for preparing a polyamide resin, comprising:
polymerizing (A) a dicarboxylic acid component comprising (a1) an aromatic dicarboxylic acid and (B) a diamine component comprising (b1) an aliphatic diamine so that an amine group in the resin is present at a concentration of about 200 to about 300 μeq/g, and the concentration of the amine group is about 2 to about 6 times the concentration of a carboxyl group,
wherein tensile strength maintenance rate of the polyamide resin evaluated by compounding 35 parts by weight of a glass fiber (GF) with respect to 100 parts by weight of the polyamide resin is 45% or more.

14. The method of claim 13 , wherein the dicarboxylic acid component (A) further comprises (a2) an amine group-containing dicarboxylic acid in an amount of about 0.1 to about 30 mol %, based on the total amount of the dicarboxylic acid component (A).

Assignees

• Cheil Ind Inc

Inventors

• Kwon So Young
• Kim Jin Kyu
• Bang Seung Youb
• Lee Eun Ju
• Im Sang Kyun
• Lee Ki Yon
• Jun Suk Min
• Choi Sung Chul

Classifications

• C08G69/28

  Preparatory processes · CPC title

• C08G69/265 Primary

  from at least two different diamines or at least two different dicarboxylic acids · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08G69/48

  Polymers modified by chemical after-treatment · CPC title