Polyamide resin composition reinforced with glass fiber

Patent metadata

Field	Value
Publication number	US-9512301-B2
Application number	US-201414781366-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 16, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The present invention provides a polyamide resin composition reinforced with glass fiber which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and having, upon necessity, excellent weather-resisting color fastness. A polyamide resin composition reinforced with glass fiber, comprising a polyamide resin (A) constituted from aliphatic polyamide (a1) and aromatic component-containing polyamide (a2), and glass fibers (B) having a cross-sectional area of 1.5 to 5.0×10 −6 cm 2 , wherein ratio by weight of the polyamide resin (A) to the glass fibers (B) [(A):(B)] is from 20:80 to 35:65 and ratio by weight of the aliphatic polyamide (a1) to the aromatic component-containing polyamide (a2) [(a1):(a2)] is from 5:95 to 95:5. The polyamide resin composition reinforced with glass fibers of the present invention can further comprise carbon black (C) in an amount of at most 5% by weight.

First claim

The invention claimed is:

1. A polyamide resin composition reinforced with glass fiber, comprising a polyamide resin (A) constituted from an aliphatic polyamide (a1) and an aromatic component-containing polyamide (a2), and glass fibers (B) having a cross-sectional area of 1.5 to 5.0 ×10 -6 cm 2 ,
wherein a ratio by weight of the polyamide resin (A) to the glass fibers (B) [(A) : (B)] is from 20:80 to 35:65 and a ratio by weight of the aliphatic polyamide (a1) to the aromatic component-containing polyamide (a2) [(a1) : (a2)] is from 5:95 to 95:5, and
wherein a part of or all of the glass fibers (B) is/are glass fibers having a flat cross section, wherein the glass fibers having a flat cross section consist of glass fibers (B-1) having a flat cross section and having a ratio of short diameter to long diameter of from 0.3 to 0.5, and glass fibers (B-2) having a flat cross section and having a ratio of short diameter to long diameter of from 0.2 to 0.3, wherein a ratio by weight thereof [(B-1) : (B-2)] is from 10:90 to 90:10.

2. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the composition further comprises carbon black (C) in an amount of at most 5% by weight of the composition.

3. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the aromatic component-containing polyamide (a2) is crystalline polyamide and the ratio by weight of (a1) to (a2) [(a1) : (a2)] is from 5:95 to 75:25.

4. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the aromatic component-containing polyamide (a2) contain poly-m-xylylene adipamide which has a relative viscosity in 96% sulfuric acid solution of 1.4 to 1.8 and has a terminal carboxyl group concentration of not higher than 50 meq/kg.

5. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the aromatic component-containing polyamide (a2) is noncrystalline polyamide and the ratio by weight of (a1) to (a2) [(a1) : (a2)] is from 60:40 to 95:5.

6. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the composition further comprises a copper compound (D) in an amount of at most 0.5% by weight of the composition.

7. The polyamide resin composition reinforced with glass fiber according to claim 1 , wherein the composition further comprises an additive component (E) containing mold-releasing agent, stabilizer and/or coupling agent in an amount of at most 5% by weight of the composition.

8. A molded product formed of the polyamide resin composition reinforced with glass fiber according to claim 1 , wherein a specific gravity ρ (g/cm 3 ) of the molded product and a bending elastic modulus E (GPa) of the molded product satisfy formulae: 11<E/ρ<18 and 1.7<ρ<2.0.

9. The molded product according to claim 8 , wherein a weight-average length of residual glass fibers in the molded product is 260 to 1000 μm.

10. The molded product according to claim 9 , wherein the molded product is used for interior equipment or for exterior equipment of electronic/electric cases or vehicles.

Assignees

• Toyo Boseki

Inventors

• Nakagawa Tomohide
• Oi Tatsuya
• Tanaka Kazunari

Classifications

• C08K7/14 Primary

  Glass · CPC title

• C08K3/04

  Carbon · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• C08J2477/10

  Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids · CPC title

• C08L77/06

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