Process for producing structurally resistant paper

Details Process for producing structurally resistant paper Process for producing structurally resistant paper

D - Textiles, Paper

21

H

D21H 17/08 (2006.01) C08G 18/80 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2219998

A process is disclosed for producing structurally resistant paper (or paper- like materials) with a terminable resistance. Paper pulp is treated in the mass or the surface of finished paper is treated with 0.0001 to 50 % by weight, preferably 0.01 to 25 % by weight (in relation to the paper mass) of a mixture of isocyanates that in average have at least 2 isocyanate groups of which at least 20 % by weight (preferably at least 50 %) have NCO groups bound by an organic residue that contains at least one ester and/or amide group in the main chain.

Selon ce procédé de fabrication de papier structuré résistant (ou de matériaux similaires au papier) dont la résistance peut être annihilée, on traite la pâte à papier dans la masse ou la surface du papier fini avec 0,0001 à 50 % en poids, de préférence 0,01 à 25 % en poids (par rapport à la masse du papier) d'un mélange d'isocyanates qui ont en moyenne au moins 2 groupes isocyanate dont au moins 20 % en poids (de préférence au moins 50%) ont des groupes NCO liés par un résidu organique qui contient dans sa chaîne principale au moins un groupe ester et/ou amide.

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