Global patent index - EP 0807704 B1

EP 0807704 B1 2000-11-02 - Recovery of fibres from bonded nonwovens

Title (en)

Recovery of fibres from bonded nonwovens

Title (de)

Wiedergewinnung von Fasern aus gebundenen Faservliesen

Title (fr)

Récupération de fibres provenant de non-tissés liés

Publication

EP 0807704 B1 (DE)

Application

EP 97107491 A

Priority

DE 19619639 A

Abstract (en)

[origin: EP0807704A1] A method for removing a polymer binder containing carboxylate groups cross-linked via alkaline earth metal ions from impregnated nonwovens comprises: (1) the nonwoven is treated with an aqueous alkali salt solution so that the alkali salt anions combine with the alkaline earth metal cations to form a poorly soluble salt or chelate; and (2) the binder-free fibres are separated. Preferably a phase transfer catalyst, preferably an alkyl phenol ethoxylate, fatty alcohol ethoxylate, oxo alcohol ethoxylate or quat. organic ammonium salt, is used in the alkali salt solution. Calcium ions are the cations present. The binder comprises a radical-polymerised polymer containing 0.1-30 wt.% carboxylate groups, of which 50-100 wt.% are present as salts containing alkaline earth metal cations. The alkali salt solution has a temperature of 10-100 degrees C. The nonwoven is added to the alkali salt solution, which is then optionally stirred before separating the fibres 1-60 minutes later.

IPC 1-7 (main, further and additional classification)

D04H 1/64

IPC 8 full level (invention and additional information)

D04H 1/435 (2012.01); D04H 1/587 (2012.01); D04H 1/645 (2012.01); D04H 3/011 (2012.01); D04H 3/12 (2006.01)

CPC (invention and additional information)

D04H 1/587 (2013.01); D04H 1/435 (2013.01); D04H 1/645 (2013.01); D04H 3/011 (2013.01); D04H 3/12 (2013.01); Y10S 260/31 (2013.01); Y10S 260/43 (2013.01)

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI NL SE

EPO simple patent family

EP 0807704 A1 19971119; EP 0807704 B1 20001102; AT 197323 T 20001115; DE 19619639 A1 19971120; ES 2152593 T3 20010201; US 6004428 A 19991221

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