US 11,939,421 B2
Or relating to curing agents
Christopher Robert Mason, Newmarket (GB); and Nicholas Verge, Letchworth (GB)
Assigned to HEXCEL COMPOSITES LIMITED, Duxford (GB)
Appl. No. 17/267,889
Filed by HEXCEL COMPOSITES LIMITED, Duxford (GB)
PCT Filed Aug. 30, 2019, PCT No. PCT/EP2019/073285
§ 371(c)(1), (2) Date Feb. 11, 2021,
PCT Pub. No. WO2020/043917, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 1814139 (GB), filed on Aug. 30, 2018.
Prior Publication US 2021/0198420 A1, Jul. 1, 2021
Int. Cl. C08G 59/40 (2006.01); C07C 257/22 (2006.01); C07D 235/00 (2006.01); C07D 247/02 (2006.01); C08G 59/00 (2006.01); C08G 59/68 (2006.01); C08G 59/70 (2006.01); C08K 5/25 (2006.01); C08K 5/544 (2006.01)
CPC C08G 59/686 (2013.01) [C07C 257/22 (2013.01); C07D 235/00 (2013.01); C07D 247/02 (2013.01); C08G 59/00 (2013.01); C08G 59/4014 (2013.01); C08G 59/4035 (2013.01); C08G 59/70 (2013.01); C08K 5/25 (2013.01); C08K 5/5477 (2021.01)] 3 Claims
 
1. A curative composition comprising a combination of adipic acid dihydrazide or isophthalic dihydrazide and a clathrate, said clathrate comprises a host component and a guest component, said guest component comprising at least one compound selected from the group consisting of a compound represented by formula:

OG Complex Work Unit Chemistry
in which R1 represents a hydrogen atom, a C1-C10 alkyl group, an aryl group, an arylalkyl group, or a cyanoethyl group, and R2 to R4 each independently represent a hydrogen atom, a nitro group, a halogen atom, a C1-C20 alkyl group, a C1-C20 alkyl group substituted with a hydroxy group, an aryl group, an arylalkyl group, or a C1-C20 acyl group; and a part with a dashed line represents a single bond or a double bond, and diazabicycloalkanes (DBCA); and
said host component comprising 4,4′-bis(4′-hydroxyphenyl) valeric acid (BHPVA) or 4,4-bis(p-hydroxyphenyl) propionic acid (BHPPA).