	US 11,692,302 B2
	Sizing agent composition, method for producing carbon fibers, and carbon fibers each having sizing agent applied thereonto
Takuya Murakami, Osaka (JP); Masayuki Chokai, Osaka (JP); Yuki Suzuki, Osaka (JP); and Takeshi Naito, Osaka (JP)
Assigned to TEIJIN LIMITED, Osaka (JP)
Appl. No. 16/971,070
Filed by TEIJIN LIMITED, Osaka (JP)
PCT Filed Feb. 14, 2019, PCT No. PCT/JP2019/005193 § 371(c)(1), (2) Date Aug. 19, 2020, PCT Pub. No. WO2019/163616, PCT Pub. Date Aug. 29, 2019.
Claims priority of application No. 2018-028978 (JP), filed on Feb. 21, 2018.
Prior Publication US 2021/0071356 A1, Mar. 11, 2021
Int. Cl. C08K 3/04 (2006.01); D06M 13/395 (2006.01); C07C 265/14 (2006.01); C08K 5/29 (2006.01); C08K 9/04 (2006.01); D06M 101/40 (2006.01)

CPC D06M 13/395 (2013.01) [C07C 265/14 (2013.01); C08K 3/04 (2013.01); C08K 5/29 (2013.01); C08K 9/04 (2013.01); D06M 2101/40 (2013.01)]

6 Claims

1. A sizing agent composition comprising (A) a blocked isocyanate and (B) a compound containing at least one polar group and at least one unsaturated group per molecule, wherein the blocked isocyanate (A) is a compound having an aliphatic skeleton and the compound (B) containing at least one polar group and at least one unsaturated group per molecule is an ester compound of polyalkylene glycol and an unsaturated carboxylic acid,

wherein the blocked isocyanate (A) is selected from the group consisting of (i) hexamethylene diisocyanate trimer blocked by a methyl ethyl ketoxime group and (ii) polyol adduct polyisocyanate compound having a hexamethylene diisocyanate trimer blocked by a methyl ethyl ketoxime group and at least one ethylene glycol skeleton, and the mixing ratio (mass ratio) of the blocked isocyanate (A) and the compound (B) containing at least one polar group and at least one unsaturated group per molecule (AB) is 75/25 to 50/50.