Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2011-07-05
2011-07-05
Daniels, Matthew J (Department: 1741)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S164100, C162S168100, C162S168200, C162S168300, C525S343000, C525S328400, C525S329200
Reexamination Certificate
active
07972478
ABSTRACT:
In a method of producing a sheet of paper and/or cardboard and similar products, prior to the formation of the sheet from a fibrous suspension, at least two dry strength agents are added to the suspension either separately in any order or mixed together and at one or more injection points, namely: a first agent corresponding to a product for Hofmann degradation in solution on a base (co)polymer comprising at least one non-ionic monomer which is selected from the group containing acrylamide and/or methacrylamide, N,N dimethylacrlamide and/or acrylonitrile; and a second agent corresponding to a (co)polymer having an anionic charge density greater than 0.1 meq/g. The Hofmann degradation product comprises an organic polymer produced at a concentration greater than 3.5% by weight, and preferably greater than 4.5% and the first and second agents are each introduced into the pulp suspension at a concentration of between 0.01 and 2% by weight of active polymer material in relation to the dry weight of the pulp suspension.
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Hund Rene
Jehn-Rendu Christian
Moretton Fabrice
Daniels Matthew J
Heslin Rothenberg Farley & & Mesiti P.C.
Minskey Jacob Thomas
S.P.C.M. SA
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