EP 0607554 B1 19970305 - Tanning agent and method of tanning
Title (en)
Tanning agent and method of tanning
Title (de)
Gerbmittel und Gerbverfahren
Title (fr)
Agent tannant et procédé de tannage
Publication
Application
Priority
DE 4242076 A 19921214
Abstract (en)
[origin: DE4242076A1] A tanning agent contains (A) as active tanning material an omega,omega'-dialdehyde of formula O=CH-(CH2)r-CH=O (I), opt. in deactivated form and (B) a polymer (P) contg. OH gps., from (a) 95-0 wt.% of monomers of formula R2HC=C(R1)-COOH (II), or of formula (II-a), b) 0-90% of monomers contg. OH gps. of formula CH2=C(R3)- C(O)-OR4 (III), (c) 0-100% of monomers of formula CH2=CH-O-C(O)-R5 (IV), and (d) 0-80% of monomers of formula CH2=C(R3)-COOR6. r = 2-8; R1 = H, Me or CH2COOH; R2 = H, Me, Ph or COOH; and (II) contains not more than 2 COOH; A = HC=CH or H2C=C-CH; R3, R'3 = H or Me; R4 = 1-12C (cyclo)alkyl with at least 1 OH; R5 = 1-2C alkyl; R6 = 1-12C (cyclo)alkyl. USE/ADVANTAGE - The tanning agent is used to prepare leather from unhaired hides, and in pickling, tanning or post-tanning. Self-condensation of the dialdehyde is prevented. The polymer, modified with the aldehyde, penetrates deeper into the skin, levels dyeing and gives easier paring. In a low-chrome post-tanning, distribution of chrome is more uniform.
IPC 1-7
IPC 8 full level
C14C 3/22 (2006.01); C14C 3/08 (2006.01); C14C 3/28 (2006.01)
CPC (source: EP KR US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI NL SE
DOCDB simple family (publication)
DE 4242076 A1 19940616; AT E149573 T1 19970315; BR 9305035 A 19940621; DE 59305626 D1 19970410; EP 0607554 A1 19940727; EP 0607554 B1 19970305; ES 2099357 T3 19970516; JP H06212200 A 19940802; KR 940014813 A 19940719; TW 229232 B 19940901; US 5492539 A 19960220; US 5505864 A 19960409
DOCDB simple family (application)
DE 4242076 A 19921214; AT 93119884 T 19931209; BR 9305035 A 19931213; DE 59305626 T 19931209; EP 93119884 A 19931209; ES 93119884 T 19931209; JP 31194093 A 19931213; KR 930027562 A 19931214; TW 83100333 A 19940117; US 16756193 A 19931214; US 45946295 A 19950605