US 11,787,913 B2
Sizing agent for carbon fibers, aqueous dispersion of sizing agent for carbon fibers, and sizing agent-adhered carbon fiber bundle
Kenji Kaneta, Tokyo (JP); Takaaki Suzuki, Tokyo (JP); Kouki Wakabayashi, Tokyo (JP); Akihiro Ito, Tokyo (JP); and Naoki Sugiura, Tokyo (JP)
Assigned to Mitsubishi Chemical Corporation, Chiyoda-ku (JP)
Filed by Mitsubishi Chemical Corporation, Chiyoda-ku (JP)
Filed on Apr. 23, 2019, as Appl. No. 16/392,190.
Application 16/392,190 is a continuation of application No. PCT/JP2017/039066, filed on Oct. 30, 2017.
Claims priority of application No. 2016-211672 (JP), filed on Oct. 28, 2016; and application No. 2017-200941 (JP), filed on Oct. 17, 2017.
Prior Publication US 2019/0249358 A1, Aug. 15, 2019
Int. Cl. C08J 5/04 (2006.01); D06M 15/55 (2006.01); D06M 15/564 (2006.01); D06M 15/53 (2006.01); D06M 15/507 (2006.01); D06M 13/224 (2006.01); D06M 10/10 (2006.01); D06M 15/59 (2006.01); C08G 59/20 (2006.01); C08J 5/06 (2006.01); D06M 15/568 (2006.01); D06M 101/40 (2006.01)
CPC C08J 5/042 (2013.01) [C08G 59/20 (2013.01); C08J 5/06 (2013.01); D06M 10/10 (2013.01); D06M 13/224 (2013.01); D06M 15/507 (2013.01); D06M 15/53 (2013.01); D06M 15/55 (2013.01); D06M 15/564 (2013.01); D06M 15/568 (2013.01); D06M 15/59 (2013.01); C08J 2300/24 (2013.01); C08J 2363/00 (2013.01); D06M 2101/40 (2013.01); D06M 2200/40 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A sizing agent-adhered carbon fiber bundle comprising carbon fibers and a sizing agent for carbon fiber,
wherein a spontaneous dispersion ratio measured by the spontaneous dispersibility test is 3 or higher,
wherein the sizing agent for carbon fiber comprises a component (A), and a component (C),
the component (A) is at least one selected from the group consisting of component (A-1), and component (A-3),
the component (A-1) is a urethane compound having a structure of the following Formula (1-1) in the molecule:

OG Complex Work Unit Chemistry
in the formula, X represents a divalent aromatic group, a divalent linear or branched aliphatic hydrocarbon group, or a divalent alicyclic hydrocarbon group; R1 and R2 each independently represent a methyl group or a hydrogen atom; and n represents an integer from 1 to 50,
the component (A-3) is an amide compound having a structure of the following Formula (1-3) in the molecule:

OG Complex Work Unit Chemistry
in the formula, X represents a divalent aromatic group, a divalent linear or branched aliphatic hydrocarbon group, or a divalent alicyclic hydrocarbon group; R, R1, and R2 each independently represent a methyl group or a hydrogen atom; and n represents an integer from 1 to 49,
the component (C) is a bisphenol type epoxy compound or an aliphatic epoxy compound, and
a sum of the component (A) and the component (C) is 40 to 75% by mass, and a content of the component (A) is from 12.25% by mass to 52.5% by mass, and a content of the component (C) is 19 to 68% by mass with respect to the total mass of the sizing agent for carbon fiber.