公开(公告)号：DE50109249D1

公开(公告)日：2006-05-11

申请号：DE50109249

申请日：2001-01-23

Applicant: BASF AG

Inventor： SCHMIDT-THUEMMES DR ,  WIRTH DR ,  KIRSCH DR

IPC: D21H19/58

Abstract: The present invention provides paper coating slips comprising a low-crosslink copolymer as their binder.

公开(公告)号：DE59702552D1

公开(公告)日：2000-12-07

申请号：DE59702552

申请日：1997-05-07

Applicant: BASF AG

Inventor： SCHUMACHER DR ,  HUMMERICH DR ,  KIRSCH DR

IPC: D04H1/435 ,  D04H1/587 ,  D04H1/64 ,  D04H1/645 ,  D04H3/011 ,  D04H3/12

Abstract: 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.