Polyamide resin

Patent metadata

Field	Value
Publication number	US-2015240078-A1
Application number	US-201314427789-A
Country	US
Kind code	A1
Filing date	Sep 6, 2013
Priority date	Sep 14, 2012
Publication date	Aug 27, 2015
Grant date	—

Abstract

The present invention is a polyamide resin (A) that contains from 95 to 99.95% by mass of a polyamide (a-1) having a number-average molecular weight of 2000 or more and from 0.05 to 5% by mass of a polyamide oligomer (a-2) having a number-average molecular weight of from 500 to less than 2000, in which at least 25 mol % of all the monomer units constituting the polyamide (a-1) and the polyamide oligomer (a-2) are structural units derived from a specific alicyclic monomer, and the content ratio of the trans isomer structural units derived from the alicyclic monomer is from 50 to 85 mol %. The polyamide resin (A) is excellent in heat resistance, low water absorption, high-temperature rigidity, chemical resistance and flowability, and exhibits the effects of securing sufficient crystallization even when molded in a mold at 80° C. and causing minimal mold deposit during production.

First claim

1 . A polyamide resin (A), comprising:
from 95 to 99.95% by mass of a polyamide (a-1) having a number-average molecular weight of 2000 or more; and from 0.05 to 5% by mass of a polyamide oligomer (a-2) having a number-average molecular weight of from 500 to less than 2000, wherein: at least 25 mol % of all the monomer units constituting the polyamide (a-1) and the polyamide oligomer (a-2) are structural units derived from an alicyclic monomer represented by formula (I) or formula (II):
X—Z—X  (I),

X—R 1 —Z—R 2 —X  (II);

X represents a carboxyl group or an amino group; Z represents an alicyclic structure having 3 or more carbon atoms; R 1 and R 2 each independently represent an alkylene group having 1 or more carbon atoms; and a content ratio of trans isomer structural units derived from the alicyclic monomer is from 50 to 85 mol %.

2 . The polyamide resin (A) according to claim 1 , wherein at least 10% of a total of terminal groups in molecular chains of the polyamide (a-1) and the polyamide oligomer (a-2) are blocked with a terminal blocking agent.

3 . The polyamide resin (A) according to claim 1 , wherein the alicyclic monomer is a cyclic aliphatic dicarboxylic acid of the formula (I) or the formula (II) where X is a carboxyl group.

4 . The polyamide resin (A) according to claim 3 , wherein the cyclic aliphatic dicarboxylic acid is 1,4-cyclohexanedicarboxylic acid.

5 . The polyamide resin (A) according to claim 1 , wherein the polyamide (a-1) and the polyamide oligomer (a-2) comprise a structural unit derived from an aliphatic diamine having from 4 to 12 carbon atoms.

6 . The polyamide resin (A) according to claim 5 , wherein the aliphatic diamine is at least one selected from the group consisting of 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine, 2-methyl-1,5-pentanediamine, 1,8-octanediamine, 1,9-nonanediamine, 2-methyl-1,8-octanediamine, 1,10-decanediamine, 1,11-undecanediamine and 1,12-dodecanediamine.

7 . The polyamide resin (A) according to claim 6 , comprising a structural unit derived from 1,4-cyclohexanedicarboxylic acid in an amount of 25 mol % or more and further comprises, as a structural unit derived from the aliphatic diamine, at least one of 1,9-nonanediamine and 2-methyl-1,8-octanediamine in an amount of 25 mol % or more.

8 . The polyamide resin (A) according to claim 1 , further comprising a structural unit derived from a lactam, an aminocarboxylic acid, or both.

9 . A polyamide resin composition, comprising:
the polyamide resin (A) of claim 1 ; and from 0.1 to 10 parts by mass of a compound (B) acting as a Lewis base relative to 100 parts by mass of the polyamide resin (A).

10 . The polyamide resin composition according to claim 9 , wherein the compound (B) is at least one selected from a group consisting of an alkali metal oxide, an alkali metal hydroxide, an alkaline earth metal oxide, an alkaline earth metal hydroxide, zinc oxide and zinc hydroxide.

11 . The polyamide resin composition according to claim 10 , wherein the compound (B) is at least one selected from a group consisting of potassium oxide, magnesium oxide, calcium oxide, zinc oxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide and zinc hydroxide.

12 . A molded article, comprising the polyamide resin (A) according to claim 1 .

13 . A molded article, comprising the polyamide resin composition according to claim 9 .

Assignees

• Kuraray Co

Inventors

• Takeda Hideaki

Classifications

• C08K2003/2296

  of zinc · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08K2003/222

  Magnesia, i.e. magnesium oxide · CPC title

• C08K3/22

  of metals · CPC title

• C08G69/26

  derived from polyamines and polycarboxylic acids · CPC title