Appeal No. 2000-1420 Page 2
Application No. 08/875,528
13. A process for producing high purity hydrotalcites
which are stratiform, anionic mixed metal hydroxides of the
general formula
wherein M2x2+, M23+ are divalent and trivalent metal(s)
respectively, x ranges from 0.5 to 10 in intervals of 0.5, A
is an interstitial anion selected from the group consisting
of a hydroxide anion and an organic anion, n is the charge
of said interstitial anion, and z is an integer of 1 to 6,
comprising
(A) mixing at least one divalent metal alcoholate
with at least one trivalent metal alcoholate, both
metal alcoholates being metal alcoholates of mono-
, di-, or trihydric C1 to C40 alcoholates, where
said mono-, di-, and trihydric metal alcoholates
being mixed in a molar ratio corresponding to the
stoichiometry of the formula referred to
hereinabove, and
(B) hydrolyzing the resultant alcoholate mixture
with water, the water for hydrolysis being used in
stoichiometric excess, referring to the reactive
valences of the metals used and where the source
of the interstitial anions for A is from the
water-soluble anions contained in the water for
hydrolysis.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Miyata et al. (Miyata ‘523) 3,879,523 Apr. 22, 1975
Miyata et al. (Miyata ‘525) 3,879,525 Apr. 22, 1975
Miyata et al. (Miyata ‘814) 4,351,814 Sep. 28, 1982
Miyata et al. (Miyata ‘626) 4,629,626 Dec. 16, 1986
Wautier et al. (Wautier) 4,968,498 Nov. 06, 1990
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