US 12,454,603 B2
Prepreg, laminate, and integrated product
Jun Misumi, Ehime (JP); Masato Honma, Ehime (JP); Kyoko Shinohara, Ehime (JP); Koji Furukawa, Ehime (JP); and Atsuhito Arai, Ehime (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/781,845
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Nov. 20, 2020, PCT No. PCT/JP2020/043339
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/117465, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-223482 (JP), filed on Dec. 11, 2019.
Prior Publication US 2023/0017689 A1, Jan. 19, 2023
Int. Cl. C08J 5/24 (2006.01); B32B 5/26 (2006.01); B32B 27/12 (2006.01); B32B 27/38 (2006.01)
CPC C08J 5/243 (2021.05) [B32B 5/26 (2013.01); B32B 27/12 (2013.01); B32B 27/38 (2013.01); B32B 2260/046 (2013.01); B32B 2262/106 (2013.01); B32B 2305/72 (2013.01); C08J 2363/00 (2013.01)] 10 Claims
 
1. A prepreg comprising composition elements [A], [B], and [C] described below, wherein:
[C] is present on a surface of the prepreg, [B] contains a first curing agent [b1] and a second curing agent [b2], and a reinforcing fiber [A] that crosses over a boundary surface between a resin region containing [B] and a resin region containing [C] and that is in contact with both resin regions is present:
[A] a reinforcing fiber,
[B] a thermosetting resin, and
[C] a thermoplastic resin,
wherein the first curing agent [b1] is diaminodiphenyl sulfone, and the second curing agent [b2] is dihydrazide isophthalate,
wherein a blending ratio of the first curing agent [b1] to the second curing agent [b2] satisfies 0.16≤mole number of [b2]/mole number of [b1]≤0.24,
wherein composition element [A] has a surface free energy of 20 to 50 mJ/m2 as measured by a Wilhelmy method and is formed from a sizing agent selected from polyethylene glycol diglycidyl ether, bisphenol A diglycidyl ether and sorbitol polyglycidyl ether
wherein composition element [B] is tetraglycidyl diaminodiphenylmethane or bisphenol A epoxy resin,
wherein composition element [C] is a polyamide, polyether ketone ketone, polyether ether ketone, polyetherimide or polyphenylene sulfide.