Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2003-07-30
2009-12-29
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S158000, C162S183000, C106S464000
Reexamination Certificate
active
07638017
ABSTRACT:
The invention concerns a pigment, filler or mineral containing a natural calcium carbonate, treated with one of more providers of H3O+ions and gaseous CO2, allowing a reduction in the weight of paper for a constant surface area without loss of physical properties when it is used as a pigment or coating filler for the said paper. In particular, the invention concerns a pigment, filler or mineral containing a natural calcium carbonate or dolomite or mixtures of talc and calcium carbonate, of kaolin and carbonate or carbonate alone or in combination with natural and/or synthetic fibres or similar, treated with one or more medium-strong or strong providers of H3O+ions in the presence of gaseous CO2.Applications are particularly in the paper industry, obtaining in particular good sheet properties i.e. a reduction its weight for a given surface area.
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Blum Rene Vinzenz
Buri Matthias
Gane Patrick A. C.
Karth Beat
Cordray Dennis
Hug Eric
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Omya Development AG
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