US 12,221,517 B2
Fiber-reinforced polyimide resin molding precursor and method for producing the same
Kouta Segami, Yokohama (JP); Kazunobu Watanabe, Yokohama (JP); and Yusuke Kobayashi, Yokohama (JP)
Assigned to TOYO SEIKAN GROUP HOLDINGS, LTD., Tokyo (JP)
Appl. No. 17/299,934
Filed by TOYO SEIKAN GROUP HOLDINGS, LTD., Tokyo (JP)
PCT Filed Dec. 9, 2019, PCT No. PCT/JP2019/048142
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2020/116658, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 2018-229938 (JP), filed on Dec. 7, 2018.
Prior Publication US 2022/0049060 A1, Feb. 17, 2022
Int. Cl. C08J 5/04 (2006.01); B29C 43/00 (2006.01); B29C 43/02 (2006.01); B29C 43/52 (2006.01); B29K 79/00 (2006.01); B29K 307/04 (2006.01)
CPC C08J 5/042 (2013.01) [B29C 43/003 (2013.01); B29C 43/02 (2013.01); B29C 43/52 (2013.01); B29K 2079/08 (2013.01); B29K 2307/04 (2013.01); C08J 2379/08 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A molding precursor, comprising:
a functional fiber impregnated with a polyimide resin having an addition-reactive group at its terminal,
the molding precursor having a melt viscosity adjusted to a range of 300 to 3200 kPa·s under conditions of keeping for 1 to 10 minutes at a temperature 5 to 20° C. lower than a thickening-start temperature of the polyimide resin.