US 12,319,974 B2
Use of reactive cross-linking agents for protein-containing substrates and processes for tanning and dyeing of leather
Daryl Miles Cassingham, Dorset (GB); Laszlo Fekete, Basel (CH); Michael Nicollet, Basel (CH); Jean Christophe Graciet, Basel (CH); and Georg Roentgen, Basel (CH)
Assigned to Archroma (Switzerland) GmbH, Pratteln (CH)
Appl. No. 18/268,372
Filed by Archroma (Switzerland) GmbH, Pratteln (CH)
PCT Filed Dec. 21, 2021, PCT No. PCT/EP2021/087045
§ 371(c)(1), (2) Date Jun. 20, 2023,
PCT Pub. No. WO2022/136403, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 20217159 (EP), filed on Dec. 23, 2020.
Prior Publication US 2024/0052438 A1, Feb. 15, 2024
Int. Cl. C14C 3/00 (2006.01); C07D 251/50 (2006.01); C14C 3/26 (2006.01); D06P 1/384 (2006.01); D06P 1/62 (2006.01)
CPC C14C 3/26 (2013.01) [C07D 251/50 (2013.01); D06P 1/384 (2013.01); D06P 1/628 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A reactive colourless protein cross-linking agent for the cross-linking of protein-based substrates having amine and optionally OH functionality, said cross-linking agent comprising a compound according to formula [1]:

OG Complex Work Unit Chemistry
wherein
L1 and L5 are each independently from each other selected from H or C1-C4 alkyl, and
L2, L3, L4, L6, L7 and L8 are each independently from each other selected from H, C1-C4 alkyl, SO3H, and OL22 wherein L22 is selected from H and C1-C4 alkyl, and
X is selected from Cl, F and nicotinic acid, and
K1, K2, K3 and K4 are each independently from each other selected from —H and protein reactive radicals, and
wherein the protein-based substrates are selected from collagen containing fibrous material, gelatin, fibroin, elastin and soy (soyabean).