Paper making and fiber liberation – Processes and products – With coating after drying
Patent
1985-11-05
1989-04-11
Chin, Peter
Paper making and fiber liberation
Processes and products
With coating after drying
1621681, 162175, 162176, 162177, 162178, D21H 134
Patent
active
048203807
ABSTRACT:
Aqueous suspensions of uncooked starch are stabilized by adding to the suspension a minor amount of a hydrophilic polymeric viscosity-increasing agent effective to prevent dilatancy and to increase the viscosity of the suspension so that settlement of starch particles during storage and transportation is substantially prevented. The hydrophilic polymeric viscosity-increasing agent is such that in a 0.5% by weight aqueous dispersion or solution thereof (based on the total weight of the dispersion or solution) at 20.degree. C. the shear stress at a shear rate of 1.0 reciprocal second is greater than 5 dynes/cm.sup.2 and the shear stress at a shear rate of 1000 reciprocal seconds is less than 250 dynes/cm.sup.2. The preferred viscosity-increasing agent is xanthan gum and the suspension may also contain a water-soluble film-forming polymer. The suspensions find use in the manufacture of paper and board.
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Casey, Pulp and Paper, vol. III, (1981), pp. 1698-1703.
Cruse John W.
O'Callaghan William
Chin Peter
P. T. Chemicals, Limited
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