D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/10 (2006.01) D21C 9/00 (2006.01) D21C 9/10 (2006.01) D21H 21/06 (2006.01)
Patent
CA 2166491
The invention is an improvement in a process for making cellulosic articles said process involving a separation of cellulosic material from a mixture containing a liquid, metal cations, and cellulosic material. The improvement involves adding to the mixture at least one retaining material which binds at least one metal cation and, in the separation, is retained with the cellulosic material. Suitable retaining agents are either organic or inorganic and include chelate-forming polymers, both synthetic and natural, colloidal suspensions of inorganic compounds, and mixed metal hydroxides. In each case, the metal cations remain in the cellulosic article, for example paper, rather going into waste water from which they would otherwise need to the removed.
Amélioration d'un procédé de fabrication d'articles cellulosiques, ce procédé impliquant la séparation de la matière cellulosique présente dans un mélange contenant un liquide, des cations métal et de la matière cellulosique. L'amélioration concerne l'incorporation dans le mélange d'au moins une matière de fixation qui se lie à au moins un cation métal et qui, lors de la séparation, est retenue avec la matière cellulosique. Les agents de fixation appropriés sont organiques ou inorganiques et comprennent des polymères formant un chélate, qui peuvent être synthétiques ou naturels, des suspensions colloïdales de composés inorganiques, et des hydroxydes métalliques mélangés. Dans tous les cas, les cations métal restent dans l'article cellulosique, du papier par exemple, au lieu d'aller dans les eaux usées d'où il faudrait alors les éliminer.
Christiansen Steven H.
Frank R. Keith
Littleton Teresa
Michalowski Robert J.
Simon Jaime
Smart & Biggar
The Dow Chemical Company
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