Glass fiber-reinforced resin molded article

Patent metadata

Field	Value
Publication number	US-11091596-B2
Application number	US-201917049505-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Dec 27, 2018
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Provided is a glass fiber-reinforced resin molded article having well-balanced and excellent static and dynamic strength and fluidity. In the glass fiber-reinforced resin molded article, glass fiber included in the glass fiber-reinforced resin molded article includes a flat cross-sectional shape having a minor axis D1 in the range of 3.0 to 10.5 μm and a major axis D2 in the range of 11.0 to 29.0 μm, the number average fiber length L (μm) of the glass fiber included in the glass fiber-reinforced resin molded article is in the range of 150 to 475 μm, the glass fiber content C (wt %) in the glass fiber-reinforced resin molded article is in the range of 40.0 to 75.0 wt %, and the above DI, D2, L, and C satisfy the following formula (1):

260.0<C 2 ×L/(D1×D2 2 )<400.0  (1).

First claim

The invention claimed is:

1. A glass fiber-reinforced resin molded article, wherein
glass fiber included in the glass fiber-reinforced resin molded article comprises a flat cross-sectional shape having a minor axis D1 in a range of 3.0 to 6.4 μm and a major axis D2 in a range of 11.0 to 26.0 μm,
a number average fiber length L (μm) of the glass fiber included in the glass fiber-reinforced resin molded article is in a range of 210 to 285 μm,
a glass fiber content C (wt %) in the glass fiber-reinforced resin molded article is in a range of 40.0 to 65.0 wt %,
an arithmetic average roughness of the glass fiber-reinforced resin molded article is less than 0.15 μm, and
the D1, D2, L, and C satisfy following formula (1), and thus, tensile strength T (GPa), bending strength B (GPa), unnotched Charpy impact strength I (KJ/m 2 ), flow length at a low speed F1 (mm), and flow length at a high speed F2 (mm) of the glass fiber-reinforced resin molded article satisfy following formula (2):
317.5≤ C 2 ×L /( D 1× D 2 2 )≤358.2  (1)

( T×B ) 1/2 ×I ×( F 1× F 2) 1/2 >300.0  (2).

2. The glass fiber-reinforced resin molded article according to claim 1 , wherein the D1 is in a range of 3.5 to 6.4 μm, the D2 is in a range of 14.0 to 26.0 μm, the C is in a range of 42.5 to 65.0 wt %, and the D1, D2, L, and C satisfy following formula (3), and thus, the T, B, I, F1, and F2 satisfy following formula (4):
317.5≤ C 2 ×L /( D 1× D 2 2 )≤335.0  (3)

( T×B ) 1/2 ×I ×( F 1× F 2) 1/2 >330.0  (4).

3. The glass fiber-reinforced resin molded article according to claim 2 , wherein the resin included in the glass fiber-reinforced resin molded article is a thermoplastic resin for injection molding selected from a group consisting of polyamide resins, polybutylene terephthalate resins, polycarbonate resins, polyarylene sulfide resins, polyaryl ketone resins, and liquid crystal polymer (LCP).

4. The glass fiber-reinforced resin molded article according to claim 3 , wherein the resin included in the glass fiber-reinforced resin molded article is a polyamide resin.

5. The glass fiber-reinforced resin molded article according to claim 1 , wherein the resin included in the glass fiber-reinforced resin molded article is a thermoplastic resin for injection molding selected from a group consisting of polyamide resins, polybutylene terephthalate resins, polycarbonate resins, polyarylene sulfide resins, polyaryl ketone resins, and liquid crystal polymer (LCP).

Assignees

• Nitto Boseki Co Ltd

Inventors

• Nukui Yosuke
• TAKATSU Kimihiro

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08J5/043 Primary

  with glass fibres · CPC title

• C08K7/14

  Glass · CPC title

• C08L101/12

  characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00) · CPC title

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title