	US 12,466,113 B2
	Internal mold release agent-containing fiber-reinforced composite molded article
Chiasa Kitani, Tokyo (JP); Satoshi Matsumoto, Nagoya (JP); Naoya Ouchiyama, Nagoya (JP); Shigeru Kawashima, Nagoya (JP); and Atsuki Tsuchiya, Nagoya (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/800,404
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Feb. 5, 2021, PCT No. PCT/JP2021/004415 § 371(c)(1), (2) Date Aug. 17, 2022, PCT Pub. No. WO2021/166698, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2020-027995 (JP), filed on Feb. 21, 2020.
Prior Publication US 2023/0106971 A1, Apr. 6, 2023
Int. Cl. B29C 33/64 (2006.01); B29C 70/18 (2006.01); B29K 63/00 (2006.01)

CPC B29C 33/64 (2013.01) [B29C 70/18 (2013.01); B29K 2063/00 (2013.01)]

6 Claims

1. A fiber-reinforced composite molded article obtained by molding reinforcing fibers and an epoxy resin, and containing a silicone oil as an internal mold release agent, wherein a fragment ion intensity ratio is detected by a surface of the molded article being analyzed by time-of-flight secondary ion mass spectrometry and is expressed by the following equation (I)

3≤A/B≤5 (I)

wherein:

A is an intensity of a fragment ion that has the highest intensity among the fragment ions derived from the silicone oil

B is an intensity of a fragment ion that has the highest intensity among the fragment ions derived from the epoxy resin

wherein the silicone oil has a functional group equivalent of 300 g/mol or more and 2,000 g/mol or less, and

wherein an addition amount of the silicone oil is 0.1 part by mass or more and 1 part by mass or less with respect to 100 parts by mass of the epoxy resin.