CORIUM OF GENUINE LEATHER AND FUR SEMIFINISHED PRODUCT AND METHODS FOR MANUFACTURE THEREOF Russian patent published in 2003 - IPC

FIELD: light industry. SUBSTANCE: corium of genuine leather and fur semifinished product includes tanning, retanning, and greasing components, of which at least 50% are distributed on structural levels of collagen base corresponding to fibrils and subfibrils. Coriums are obtained using a method comprising preliminary and pretannage processes and operations envisaging deep unfolding of corium structure, using complex chrome tanners containing at least 50% of complexes based on their total amount no larger than 0.5 nm and degree of desiccation ability no more than 40%. Greasing is performed by grease compositions forming direct water emulsions with sorption stability at least 5 mg/g and containing up to 50% of dispersed phase particles no more than 1.0 nm in size. EFFECT: improved quality of corium due to optimal distribution of tanning, retanning, and greasing components in structural elements of corium and rational employment of raw material and reagents. 3 cl, 2 tbl, 2 ex