Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1993-07-09
1995-09-05
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621815, D21H 1767
Patent
active
054476038
ABSTRACT:
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, e.g. paper, rather going into waste water from which they would otherwise need to be removed.
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Christiansen Steven H.
Frank R. Keith
Littleton Teresa
Michalowski Robert J.
Simon Jaime
Chin Peter
The Dow Chemical Company
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