Polyamide composition, molded article, reflective plate for led, and method for suppressing reduction in reflectance due to heat

Patent metadata

Field	Value
Publication number	US-2016304696-A1
Application number	US-201415100717-A
Country	US
Kind code	A1
Filing date	Dec 9, 2014
Priority date	Dec 13, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

A polyamide composition containing a polyamide (A), 0.1 to 20% by mass of a metal hydroxide (C) and/or a metal oxide (D), and 0.1 to 20% by mass of a phosphorus-based compound (E).

First claim

1 . A polyamide composition comprising:
a polyamide (A), 0.1 to 20% by mass of a metal hydroxide (C) and/or a metal oxide (D), and 0.1 to 20% by mass of a phosphorus-based compound (E).

2 . The polyamide composition according to claim 1 , wherein the polyamide (A) has a melting point of 270 to 350° C.

3 . The polyamide composition according to claim 1 , wherein the polyamide (A) is a polyamide comprising a dicarboxylic acid comprising 50% by mol or more of an alicyclic dicarboxylic acid as a monomer for polymerization.

4 . The polyamide composition according to claim 3 , wherein the alicyclic dicarboxylic acid comprises 1,4-cyclohexanedicarboxylic acid.

5 . The polyamide composition according to claim 1 , further comprising 5% by mass or more of a titanium oxide (B).

6 . The polyamide composition according to claim 1 , wherein the metal hydroxide (C) is an alkaline earth metal hydroxide.

7 . The polyamide composition according to claim 1 , wherein the metal oxide (D) is an alkaline earth metal oxide.

8 . The polyamide composition according to claim 1 , wherein the phosphorus-based compound (E) is a metal salt, and a metal element of the metal salt is the same as a metal element of the metal hydroxide (C) and/or the metal oxide (D).

9 . The polyamide composition according to claim 1 , wherein the phosphorus-based compound (E) is an alkaline earth metal salt.

10 . The polyamide composition according to claim 1 , further comprising 5% by mass or more of an inorganic filler (F).

11 . The polyamide composition according to claim 1 , further comprising 0.001 to 15% by mass of a nucleating agent.

12 . The polyamide composition according to claim 1 , wherein a phosphorus element concentration derived from the phosphorus-based compound (E) comprised in the polyamide composition is 1,400 to 20,000 ppm, and a difference (Tc−Tg) between a crystallization peak temperature Tc obtained in cooling at 100° C./min in differential scanning calorimetry according to JIS-K7121, and a glass transition temperature Tg is 100° C. or higher.

13 . A molded article comprising the polyamide composition according to claim 1 .

14 . The molded article according to claim 13 , wherein a reflectance retention rate after exposure for 1000 hours by a metal halide lamp system light resistance tester at 100° C. and at a position where an illuminance is 10 mW/cm 2 is 95% or more.

15 . A reflective plate for LED, comprising the polyamide composition according to claim 1 .

16 . A polyamide composition comprising:
a polyamide (A) comprising a dicarboxylic acid comprising 50% by mol or more of an alicyclic dicarboxylic acid as a monomer for polymerization, 5% by mass or more of a titanium oxide (B), 0.1 to 20% by mass of a metal hydroxide (C) and/or a metal oxide (D), and 0.1 to 20% by mass of a phosphorus-based compound (E).

17 . The polyamide composition according to claim 16 , wherein the metal hydroxide (C) is an alkaline earth metal hydroxide.

18 . The polyamide composition according to claim 16 , wherein the metal oxide (D) is an alkaline earth metal oxide.

19 . The polyamide composition according to claim 17 , wherein the phosphorus-based compound (E) is a metal salt, and a metal element of the metal salt is the same as a metal element of the metal hydroxide (C) and/or the metal oxide (D).

20 . The polyamide composition according to claim 18 , wherein the phosphorus-based compound (E) is a metal salt, and a metal element of the metal salt is the same as a metal element of the metal hydroxide (C) and/or the metal oxide (D).

Assignees

• Asahi Chemical Ind

Inventors

• Ieda Shinji
• Fujino Yoshinori
• Nitto Yu

Classifications

• C08K2201/014

  Additives containing two or more different additives of the same subgroup in C08K · CPC title

• C08K3/32

  Phosphorus-containing compounds · CPC title

• C08K2003/325

  Calcium, strontium or barium phosphate · CPC title

• C08K2003/2206

  of calcium, strontium or barium · CPC title

• C08K3/22 Primary

  of metals · CPC title