Improved papermaking process

Details Improved papermaking process Improved papermaking process

D - Textiles, Paper

21

C

D21C 3/00 (2006.01) D21H 23/14 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2204050

The claimed invention comprises a papermaking process comprising forming an aqueous cellulosic papermaking slurry, subjecting the slurry to one or more shear stages, adding to the slurry a mineral filler prior to at least one of the shear stages, adding to the slurry after the addition of the mineral filler and prior to at least one of the shear stages an effective amount of a dispersion polymer selected from the group consisting of copolymers of acrylamide and dimethylaminoethylacrylate methyl chloride quaternary salt (DMAEA.MCQ), dimethylaminoethylmethacrylate methyl chloride quaternary salt (DMAEM.MCQ). dimethylaminoethylacrylate benzyl chloride quaternary salt (DMAEA.BCQ) and dimethylaminoethylmethacrylate benzyl chloride quaternary salt (DMAEM.BCQ) and diallyldimethylammonium chloride (DADMAC), shearing the slurry. adding a microparticle selected from the group consisting of organics such as copolymers of polyacrylic acid. inorganics such as bentonite and silica sol, draining the slurry to form a sheet. and drying the sheet to form a paper sheet.

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