Polyamide resin

Patent metadata

Field	Value
Publication number	US-8927647-B2
Application number	US-200913119262-A
Country	US
Kind code	B2
Filing date	Sep 15, 2009
Priority date	Sep 18, 2008
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A polyamide resin composed of constitutional units derived from a diamine component 70 mol % or more of which is derived from p-xylylenediamine and constitutional unit derived from a dicarboxylic acid 70 mol % or more of which is derived from an aliphatic dicarboxylic acid having 6 to 18 carbon atoms. The polyamide resin has a number average molecular weight (Mn) of 10,000 to 50,000 and a degree of dispersion (weight average molecular weight/number average molecular weight=Mw/Mn) satisfying the following formula (1):

1.5≦(Mw/Mn)≦6.0,

wherein Mw and Mn are determined by gel permeation chromatography (GPC).

First claim

What is claimed is:

1. A polyamide resin, comprising:
a constitutional unit derived from diamine component, and
a constitutional unit derived from dicarboxylic acid component,
wherein 70 mol % or more of the constitutional unit derived from the diamine component is derived from p-xylylenediamine,
70 mol % or more of the constitutional unit derived from dicarboxylic acid component is derived from an aliphatic dicarboxylic acid having 6 to 10 carbon atoms,
a number average molecular weight (Mn) is from 10,000 to 50,000, and
a degree of dispersion expressed by
Mw/Mn=weight average molecular weight/number average molecular weight satisfies formula (1)
1.5≦(Mw/Mn)≦3.0  (1),

wherein Mn and Mw are determined by a gel permeation chromatography (GPC).

2. The polyamide resin according to claim 1 , wherein a relative viscosity is from 1.80 to 4.20 when determined with a solution in concentrated sulfuric acid in a concentration of 1 g/100 mL at 25° C.

3. The polyamide resin according to claim 1 , wherein the aliphatic dicarboxylic acid is at least one acid selected from the group consisting of adipic acid, azelaic acid, and sebacic acid.

4. The polyamide resin according to claim 1 , wherein retention of melt viscosity (%) after the polyamide resin is maintained in a molten state at a temperature higher than a melting point of the polyamide resin by 10 to 50° C. for 30 min satisfies formula (2)
70<( a/b )×100<130  (2),

wherein a is a melt viscosity (Pa·s) after maintained in a molten state for 30 min and b is a melt viscosity (Pa·s) after 2.5 min from starting the melting.

5. A polyamide resin composition, comprising:
100 parts by weight of the polyamide resin as defined in claim 1 ,
0 to 30 parts by weight of an nucleating agent for crystallization, and
10 to 150 parts by weight of inorganic filler.

6. The polyamide resin according to claim 2 , wherein the aliphatic dicarboxylic acid is at least one acid selected from the group consisting of adipic acid, azelaic acid, and sebacic acid.

7. The polyamide resin according to claim 2 , wherein retention of melt viscosity (%) after the polyamide resin is maintained in a molten state at a temperature higher than a melting point of the polyamide resin by 10 to 50° C. for 30 min satisfies formula (2)
70<( a/b )×100<130  (2),

wherein a is a melt viscosity (Pa·s) after maintained in a molten state for 30 min and b is a melt viscosity (Pa·s) after 2.5 min from starting the melting.

8. The polyamide resin according to claim 3 , wherein retention of melt viscosity (%) after the polyamide resin is maintained in a molten state at a temperature higher than a melting point of the polyamide resin by 10 to 50° C. for 30 min satisfies formula (2)
70<( a/b )×100<130  (2),

wherein a is a melt viscosity (Pa·s) after maintained in a molten state for 30 min and b is a melt viscosity (Pa·s) after 2.5 min from starting the melting.

9. The polyamide resin according to claim 1 , wherein 90 mol % or more of the constitutional unit derived from the diamine component is derived from p-xylylenediamine.

Assignees

• Kanda Tomomichi
• Kuwahara Hisayuki
• Ogawa Shun
• Sumino Takahiko
• Ishii Kentaro
• Mitsubishi Gas Chemical Co

Inventors

• Kanda Tomomichi
• Kuwahara Hisayuki
• Ogawa Shun
• Sumino Takahiko
• Ishii Kentaro

Classifications

• C08G69/26

  derived from polyamines and polycarboxylic acids · CPC title

• C08G69/265

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

• C08L77/06 Primary

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