Global Patent Index - EP 0862671 B1

EP 0862671 B1 2000-04-05 - PROCESS FOR PRESERVING PAPER

Title (en)

PROCESS FOR PRESERVING PAPER

Title (de)

VERFAHREN ZUM KONSERVIEREN VON PAPIER

Title (fr)

PROCEDE DE CONSERVATION DE PAPIER

Publication

EP 0862671 B1 (DE)

Application

EP 96941012 A

Priority

  • DE 19543707 A
  • EP 9605176 W

Abstract (en)

[origin: DE19543707A1] A process is disclosed for preserving paper involving the following steps: (a) a plurality of paper layers in contact with one another at least in regions is simultaneously brought into contact with a preservative fluid containing polycondensates based on one or more hydrolytic polycondensation-capable compounds of elements M of main groups III-V and sub-groups II-IV of the periodic table; in said polycondensates, at least one organic group (G) with at least two carbon atoms and for each carbon atom at least one atom selected from hydrogen or fluorine and without polar substituents is bound, either directly via one of the carbon atoms or via a connecting group A, to at least 0.1 % of the central atoms M; and (b) the paper thus treated with the preservative fluid is dried and/or hardened. In one example of the production of the preservative fluid, 27 g (1.5 mol) of water were stirred into a solution of 55.8 g (0.2 mol) of gamma -glycidoxypropyltriethoxysilane and 5.1 g (0.01 mol) of1H,1H,2H,2H-perfluoroctyltriethoxysilane. The reaction mixture was then heated for six hours under reflux conditions. 20 g (0.08 Mol) of bisphenol S were added to the by then single-phase solution which was then diluted with 100, 150 or 200 g ethanol. After the bisphenol S had dissolved, 0.8 g (0.001 Mol) of 1-methylimidazole were added as a cross-linking catalyst and the reaction mixture was stirred for 10 minutes. For coating, the solution was poured into a crystallisation dish.

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

D21H 25/18; B41M 7/00; B44D 7/00

IPC 8 full level (invention and additional information)

D21H 25/18 (2006.01)

CPC (invention and additional information)

D21H 25/18 (2013.01)

Designated contracting state (EPC)

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

EPO simple patent family

DE 19543707 A1 19970528; AT 191525 T 20000415; EP 0862671 A1 19980909; EP 0862671 B1 20000405; ES 2144275 T3 20000601; GR 3033765 T3 20001031; PT 862671 E 20000929; US 6071475 A 20000606; WO 9719224 A1 19970529

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