Search International and National Patent Collections

1. (WO2018143283) COMPOSITE MATERIAL INCLUDING CARBON FIBERS AND THERMOPLASTIC RESIN, MOLDED BODY PRODUCTION METHOD USING SAME, AND MOLDED BODY

Pub. No.:    WO/2018/143283    International Application No.:    PCT/JP2018/003239
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Thu Feb 01 00:59:59 CET 2018
IPC: B29B 11/16
B29C 70/40
C08J 5/04
B29K 71/00
B29K 77/00
B29K 101/12
Applicants: TEIJIN LIMITED
帝人株式会社
Inventors: NOMURA Akihisa
野村 晃久
Title: COMPOSITE MATERIAL INCLUDING CARBON FIBERS AND THERMOPLASTIC RESIN, MOLDED BODY PRODUCTION METHOD USING SAME, AND MOLDED BODY
Abstract:
The present invention provides: a composite material including carbon fibers having a weight average fiber length of 1-100 mm and a thermoplastic resin, wherein said composite material satisfies K1≤1.5×K2 and exhibits excellent conformability during a stretching step in press molding; and a press molded body production method using said composite material. K1 represents the inclination of an approximate straight line obtained by performing strain sweep tests from 0 to 100% on the composite material at a temperature of 270°C, a shear of 100 rad/sec, and a normal load of 2 N, plotting, both in logarithmic scales, the values of strain% versus the values of complex viscosity coefficient Pa·sec in the range of not less than 35% strain, and performing linear approximation thereon. K2 represents the inclination of an approximate straight line obtained by performing strain sweep tests from 0 to 100% on the composite material at a temperature of 270°C, a shear of 100 rad/sec, and a normal load of 2 N, plotting, both in logarithmic scales, the values of strain% versus the values of complex viscosity coefficient Pa·sec in the range of less than 35% strain, and performing linear approximation thereon.