Nippon Paint receives patent
for pigment dispersion
Patent No. U.S. 7,780,778 B2
Nippon Paint Co., Ltd. has received a
patent for a pigment dispersion consisting of a first pigment made of a coloring
pigment having a primary average particle diameter of 200 nm or smaller, or
made of carbon black having an average
particle diameter of a structure of 100
nm or smaller, and a second pigment
made of barium sulfate having a primary
average particle diameter of 55 nm or
smaller, a pigment dispersant and a
medium. The first pigment and the second pigment are combined so that a
value of (acid amount-base amount) of
one pigment becomes positive, and a
value of (acid amount-base amount) of
the other pigment becomes negative, the
combined first and second pigments
being dispersed in the medium in the
presence of the pigment dispersant, and
the pigment dispersant being a nonionic
or anionic pigment dispersant.
able, organic-based aqueous coating ma-
terial comprised of a colloidally dis-
persed metallic bismuth, present in an
amount between from 0.01% to 2.5%
by weight, based on total amount of the
coating, and at least one alkanemono-
carboxylic acid having at least 5 carbon
atoms in the alkane and the alkane con-
sists of the alkane, wherein the col-
loidally dispersed metallic bis-
muth is provided from at least
one salt of bismuth that is pres-
ent in an amount greater than
an amount of the at least one alka-
nemonocarboxylic acid in the coating
material and wherein the bismuth pres-
ent in the coating provides heavy corro-
sion protection. CW
Imerys Pigments patents
method for separating mixture
of finely divided minerals
Patent No. U.S. 7,780,779 B2
Imerys Pigments, Inc. has been granted a
patent for a composition comprised of
kaolin having a particle size distribution
such that at least 90% of the kaolin has a
particle size of less than approximately 1
μm and a median particle size (d50) ranging from 0.25 μm to less than 0.35 μm,
having an Fe2O3 content in an amount
less than approximately 0.8% by weight
relative to the total solids content, and a
GE brightness of at least 91, the kaolin
being derived from a crude kaolin having
Fe2O3 in an amount of at least 1.0% by
weight, relative to the weight of the crude
kaolin and a titania content of at least
1.5% by weight, relative to the weight of
the crude kaolin.
BASF Coatings patents
colloidally dispersed metallic
bismuth coating
Patent No. U.S. 7,781,054 B2
BASF Coatings GmbH has been granted
a patent for a coating on a metallic substrate prepared from a thermally cur-
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