US 11,987,550 B2
Method for preparing crosslinker compound
Ji Eun Kim, Daejeon (KR); Won Taeck Lim, Daejeon (KR); Yongjin Kim, Daejeon (KR); Gicheul Kim, Daejeon (KR); Wonmun Choi, Daejeon (KR); and Ki Hyun Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 16/968,999
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 7, 2019, PCT No. PCT/KR2019/013125
§ 371(c)(1), (2) Date Aug. 11, 2020,
PCT Pub. No. WO2020/111496, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0149736 (KR), filed on Nov. 28, 2018.
Prior Publication US 2021/0024451 A1, Jan. 28, 2021
Int. Cl. C07C 67/44 (2006.01); C08J 3/12 (2006.01); C08J 3/24 (2006.01); C08K 5/11 (2006.01)
CPC C07C 67/44 (2013.01) [C08J 3/12 (2013.01); C08J 3/243 (2013.01); C08K 5/11 (2013.01); C08J 2433/02 (2013.01)] 7 Claims
 
1. A method for preparing a crosslinker compound which is used as an internal crosslinking agent or a thermally decomposable crosslinker for production of a super absorbent polymer, the method comprising the steps of:
reacting a compound of Chemical Formula 1a with a ketone in the presence of a base to form a compound of Chemical Formula 1,
hydrogenating the compound of Chemical Formula 1 under a catalyst in the presence of one or more solvents selected from the group consisting of ethyl acetate, methanol, and tetrahydrofuran to form a compound of Chemical Formula 2, wherein the catalyst consists of Pd/C, and is used in an amount of 0.1 to 5 mol % with respect to the compound of Chemical Formula 1, and
subjecting the compound of Chemical Formula 2 and a compound of Chemical Formula 3 to an esterification reaction to form a compound of Chemical Formula 4:

OG Complex Work Unit Chemistry
wherein, R1′ has a triple bond and is a divalent organic group having 2 to 10 carbon atoms, R1 is a divalent organic group comprising an alkyl group having 2 to 10 carbon atoms, R2 and R3 are each independently an alkyl group having 1 to 5 carbon atoms, R4 is hydrogen or a methyl group, X is halogen, R1″ has a triple bond at the terminal and is a monovalent organic group having 2 to 9 carbon atoms, and R2′ and R3′ are each independently hydrogen or an alkyl group having 1 to 5 carbon atoms.