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(11)    Patent No :    AP 2716   
(21)    Application No :    AP/P/2008/004653   
(22)    Filing Date :    04.05.2007   
(24)    Date of Grant &    31.07.2013   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
GB    0610003.6    19.05.2006
(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
(73) Applicant(s)

CIBA HOLDING INC., Klybeckstrasse 141, 4057 Basel,

Switzerland

(72) Inventors

DMOND Brian, United Kingdom

LAMPERD John, Australia
BEVERIDGE Angela, Australia
et al
(74) Representativ
HOEY & BLANCKENBERG
(51)  International  Classification   B09B 3/00 (2006.01)    C02F 11/00 (2006.01)
(54)    Title

Treatment of aqueous suspensions

(57)    Abstract

A process in which a suspension comprising dispersed particulate material in anaqueous medium is transferred as a fluid to a deposition area, then allowed to stand and rigidity, and in which rigidification is improved whilst retaining the fluidity of the suspension during transfer, by combining with the suspension during transfe r a rigidifying amount of a treatment system which comprises

i)    a water-soluble synthetic polymer and

ii)    a water-soluble natural or seminatural polymer.

Improved rigidification can be achieved, including dose efficiency especially in regard to the amount of synthetic polymer required. In addition

improvements in the clarity of liquor released from the suspension can be achieved.
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(56)    Documents Cited :    WO 94 02567 A    US 3 681 012 A    US 6 042 732 A    WO 2004 060 819 A    WO

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