Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1996-10-08
1999-03-02
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621681, 1621682, 1621683, 1621816, 1621818, 162183, D21H 1728
Patent
active
058765638
ABSTRACT:
Paper strengthened by starch, typically in amounts of 3 to 15% dry weight, is made by flocculating a cellulosic suspension using a polymeric retention aid which can be dissolved cationic starch but is preferably a synthetic polymer having IV above 4 dl/g, optionally shearing the resultant flocculated suspension and reflocculating it by adding bentonite or other microparticulate anionic material, draining the flocculated or reflocculated suspension and drying the resultant wet sheet, wherein insoluble particles of starch are added to the suspension as a slurry of substantially freely dispersed particles in part or all of the aqueous solution of the polymeric retention aid or in part or all of the aqueous suspension of microparticulate anionic material. In the process improved retention of starch may be obtained when the aqueous solution of the polymeric retention aid also contains a cationic coagulant selected from inorganic cationic coagulants and cationic polymeric materials having intrinsic viscosity 3 dl/g or below and charge density at least 4 meq/g.
REFERENCES:
patent: 2729561 (1956-01-01), Chung
patent: 3468706 (1969-09-01), Speakman
patent: 3930877 (1976-01-01), Aitken
patent: 4347100 (1982-08-01), Brucato
patent: 4388150 (1983-06-01), Sunden et al.
patent: 4609432 (1986-09-01), Brucato
patent: 4913775 (1990-04-01), Langley et al.
patent: 5126014 (1992-06-01), Marrone
Okomori et al., Basic Properties of Handsheet containing starch pulp, 1994, pp. 237-241.
Moore, Charge Relationshps of dual polymer retention aids, 1976, pp. 120-122.
Springer et al., The Influence of starch on drainage . . . 1984, pp. 104-108.
Starch Application, Review and a method for further consideration.
Allied Colloids Limited
Chin Peter
LandOfFree
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