Appeal No. 2000-1877
Application No. 08/881,457
a non-surfactant salt selected from the group consisting of
alkali metal salts of sulfates, citrates, sulfo-succinates and
mixtures thereof.
According to appellants' specification, the powder comprises
two distinct phases (Specification, p. 9, lines 18-24):
One of these phases is insoluble in the non-aqueous
organic liquid diluents; the other phase is soluble in
the non-aqueous organic liquids. It is the insoluble
phase of this anionic surfactant-containing powder
which is dispersed in the non-aqueous liquid phase of
the compositions herein and forms a network of
aggregated small particles that allows the final
product to stably suspend other additional solid
particulate materials in the composition.
The preparation of a powder within the scope of claim 1 is
described in Example I as follows (Specification, p. 24, line 26-
p. 25, line 12):
EXAMPLE I
Preparation of LAS Powder
Sodium C12 linear alkyl benzene sulfonate (NaLAS)
is processed into a powder containing two phases. One
of these phases is soluble in the non-aqueous liquid
detergent compositions herein and the other phase is
insoluble. It is the insoluble fraction which serves
to add structure and particle suspending capability to
the non-aqueous phase of the compositions herein.
NaLAS powder is produced by taking a slurry of
NaLAS in water (approximately 40-50% active) combined
with dissolved sodium sulfate (3-15%) and a hydrotrope,
sodium sulfosuccinate (1-3%). The hydrotrope and
sulfate are used to improve the characteristics of the
dry powder. A drum dryer is used to dry the slurry
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Last modified: November 3, 2007