Paper making and fiber liberation – Processes and products – Reclamation – salvage or reuse of materials
Patent
1979-05-30
1981-05-19
Smith, William F.
Paper making and fiber liberation
Processes and products
Reclamation, salvage or reuse of materials
162164EP, 162168NA, D21F 182
Patent
active
042683521
ABSTRACT:
This invention is a method of increasing the amount of retention of deposited starch and pigment on fibers in broke liquid which consists of adding to said liquid a combination dosage of a DMA-epichlorohydrin polymer together with a second polymer consisting of acrylamide/acrylate. Such a polymer may be anionic, such as an acrylamide/sodium acrylate 5% or 30% acrylic acid, or it may be cationic, such as acrylamide/dimethylamino ethyl methacrylate dimethyl sulfate quaternary. The polymers may be applied to the broke directly and preferably in the form of an inverted water-in-oil emulsion. The dosage based on dry weight of starch (T) ranges from 2-35 lbs/T of the DMA-epichlorohydrin polymer product (48% polymer, 0.96-16.8 lbs/T polymer) and 0.5-8 lbs/T based on the second polymer product (28% polymer, 0.14-2.24 lbs/T polymer) selected from the group consisting of copolymers of acrylamide/acrylic acid; copolymers of acrylamide/alkali metal acrylate (e.g., sodium acrylate); copolymers of acrylamide/dimethylamino ethyl methacrylate dimethyl sulfate quaternary (DMAEM.DMS quat).
REFERENCES:
patent: 3201304 (1965-08-01), Monjat et al.
patent: 3323979 (1967-06-01), Foster et al.
patent: 3790476 (1974-02-01), Spoerle et al.
patent: 3907758 (1975-09-01), Sackmann et al.
patent: 4029885 (1977-06-01), Buikema
Cosper David R.
Soll Patricia R.
Miller Robert A.
Nalco Chemical Company
Premo John G.
Roberts, Jr. John S.
Smith William F.
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