Valspar patents low VOC coatings
U.S. 8,110,624 B2
The Valspar Corporation has obtained a
patent for a low-VOC paint comprised of
a latex polymer comprised of a surfactant
and polymer particles comprised of a ho-
mopolymer or copolymer including at
least one of an acrylate or a methacrylate;
a pigment; and a coalescent; wherein at
least 1% by weight, based on polymer
solids, of the paint is comprised of a coa-
lescent having the formula:
R1—(C(O)—X—O)n—R2 wherein
R1 is an aliphatic hydrocarbyl moiety
and is comprised of 3 to 24 carbon
atoms, X is a divalent organic group com-
prising oxygen atoms and 2 to 8 carbon
atoms, n is 1, and R2 is an organic group
comprised of 3 to 24 carbon atoms and
one carbonyl group; with the proviso that
the coalescent does not include any
aliphatic unsaturated carbon-carbon
bonds; and wherein the coalescent has a
volatile organic content of less than ap-
proximately 15% weight is nonreactive in
the paint, and is dispersible in the paint
to form a uniform mixture.
composition comprised of unmodified,
protonated silica nanoparticles; a urethane acrylate; a polar solvent; and a UV
initiator system, wherein the amount by
weight of the unmodified, protonated silica nanoparticles exceeds the amount by
weight of the urethane acrylate and is
present in an amount of at least 50.1%
weight, based on the total dry weight of
the composition.
the slurry by addition of a mineral acid
over the course of one hour, thereby
forming a slurry of silica coated titanium
dioxide particles; B. (1) adjusting the
temperature of the slurry of silica coated
titanium dioxide particles to a temperature of from 55 to 90° C, (2) adding sufficient sodium aluminate as a water
solution to the slurry in step B(1) and
adjusting the pH of the mixture formed
to from 5 to 9 by addition of a strong
mineral acid to deposit alumina as
Al2O3 of from 1 to 4% by weight based
on the weight of titanium dioxide particles present in the slurry of step A(1) on
the surface of the silica coated particles,
and digesting the resulting mixture for
from 15 to 30 minutes to form the titanium dioxide particles surface coated sequentially with amorphous silica and
amorphous alumina; and C. dispersing
the surface coated titanium dioxide into
a resin to form a coating formulation.
PPG Industries patents food
cans coated with an acrylic
polymer composition
U.S. 7,858,162 B2
PPG Industries has been granted a patent
for a food can coated at least in part on
the interior with a composition comprised
of a greater than 7% weight, based on
total solids weight, of an acrylic polymer
having a weight average molecular weight
of greater than or equal to 60,000 and an
acid value of < 30 mg KOH/g; and a
crosslinker, wherein the composition is
substantially epoxy-free and substantially
polyester-free.
DuPont patents easy to
disperse, high durability TiO2
pigment
U.S. 8,105,432 B2
E.I. du Pont de Nemours and Company
has received a patent for a method for
making titanium dioxide particles surface coated with silica and alumina,
comprised of the steps in order: A. (1)
heating a slurry of raw titanium dioxide
particles to a temperature of from 85 to
100° C, (2) adding citric acid as a solution in water to the slurry to form a mixture, ( 3) adjusting the pH of the mixture
to 10 or more, ( 4) adding sufficient
sodium silicate as a water solution to the
mixture to deposit silica on the surface
of the particles of from 1 to 6% based
on the weight of the titanium dioxide
particles in the slurry, ( 5) neutralizing
Coated coloring agents
U.S. 8,110,010 B2
Henkel AG & Co. KGaA has obtained a
patent for an agent for coloring keratinic
fibers comprised of at least one particulate
component having a particle core containing at least one oxidation dye precur-
Reactive Surfaces augments foreign patent coverage for bio-
additives in coatings
Bayer MaterialScience patents
silica-containing UV-crosslinkable hardcoat coating
U.S. 8,101,673 B2
Bayer MaterialScience AG has been obtained a patent for a UV-crosslinkable
Reactive Surfaces has expanded its patent portfolio in the Middle East. Israeli
has granted the Austin, Texas-based company a patent for coatings having insoluble particulate materials purified from viruses and microorganisms. These
particulates from renewable sources may be used as non-toxic and biodegradable bulk fillers as well as functionalized coating components. Patent protection
is provided for specific coatings categories such as architectural, automotive,
chemical agent resistant, aircraft and multi-pack coatings, as well as objects that
are coated by these new types of biologically-derived coating materials. The
claims allowed in Israel mirror similar claims in Western Europe and the Americas, and cover technical areas into which the company is expanding using genetic engineering of its bio-based additives.
18 | Coatings World
www.coatingsworld.com
May 2012
