Title (en)

Bleaching of synthetic fibers.

Title (de)

Bleichen von Synthesefasern.

Title (fr)

Blanchiment des fibres synthétiques.

Publication

EP 0671499 A2 19950913 (DE)

Application

EP 95102883 A 19950301

Priority

• DE 4408249 A 19940311
• DE 4424820 A 19940714

Abstract (en)

Synthetic fibres are bleached using a soln., at 100-135 degrees C,that contains H2O2 and has pH 3-7. Pref. the soln. contains ≤ 65 (pref. 20-35) wt.% H2O2 soln., e.g. 1-20 ml/l of a 35 wt.% soln. It may include: (1) stabilisers, pref. <0.5 (esp. 0.3) wt.% alkaline earth (e.g. Mg and/or Ca) metal salts; (2) organic complexing agents, pref. aminocarboxylic acids and their alkali salts at 0.1-5 (pref. 0.2-1) g/l; (3) 0.1-5 (pref. 0.2-1) g/l bleaching auxiliary (esp. protein degradation product, alkyl- or alkylaryl-phosphate); (4) surfactant, pref. alkyl-phenol condensate; alkyl-aryl-sulphonic acid and/or alkyl sulphate at 0.5-3 (pref. 1-2) g/l; (5) 0.5-10 (pref. 2-3) g/l polyphosphate, partic. of formulae: Mn+2PnO3n+1 or MnPnO3n, where M = alkali(ne earth) or NH4 ion; n = 1-6; (6) 0.1-5 g/l optical brightener. Treatment is at pH 5-7 and 120-130 degrees C (corresponding to 1-3.5, partic. 2-3, atm.), using a goods to liquor ratio 1:3-40, pref. 1:10-20. Bleaching is typically for 80-120 mins. at 100 degrees C or for 10-30 mins. at 135 degrees C.

Abstract (de)

Gegenstand der vorliegenden Erfindung ist ein Verfahren zum Bleichen von Synthesefasern mit Wasserstoffperoxid, das dadurch gekennzeichnet ist, daß man die Synthesefaser mit einer Bleichlösung, enthaltend Wasserstoffperoxid, bei einem pH-Wert der Bleichlösung von 3 bis 7 und einer Bleichtemperatur der Bleichlösung zwischen 100 und 135 °C bleicht.

IPC 1-7

D06L 3/02

IPC 8 full level

D06L 3/02 (2006.01); D06L 3/12 (2006.01)

CPC (source: EP)

D06L 4/12 (2016.12); D06L 4/13 (2016.12)

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB IT LI NL PT SE

DOCDB simple family (publication)

EP 0671499 A2 19950913; CA 2144371 A1 19950912; CZ 61195 A3 19951115; FI 951100 A0 19950309; FI 951100 A 19950912; JP H0849164 A 19960220; NO 950937 D0 19950310; NO 950937 L 19950912; PL 307628 A1 19950918; SI 9500079 A 19951031

DOCDB simple family (application)

EP 95102883 A 19950301; CA 2144371 A 19950310; CZ 61195 A 19950309; FI 951100 A 19950309; JP 5006195 A 19950309; NO 950937 A 19950310; PL 30762895 A 19950310; SI 9500079 A 19950310