Patents Update
PPG patents abrasion resistant coating
Patent No. U.S. 7,745,514 B2
PPG Industries has been granted a
patent for a method for making an
organic dispersion of polymer-enclosed
particles from an aqueous dispersion
of the polymer-enclosed particles in a
continuous phase that is an aqueous
medium, comprised of diluting the
aqueous dispersion of the polymer-enclosed particles with a water miscible organic solvent in an amount sufficient to produce a dispersion wherein
the continuous phase is comprised of a
predominantly organic solvent.
DEPARTMENT OF ENERGY PATENTS
THERMAL BARRIER COATINGS
Patent No. U.S. 7,740,948 B1
The United States of America as rep-
resented by the United States
Department of Energy, Washington,
D.C. has obtained a metallic article
having a thermal barrier coating sys-
tem thereon, comprised of a metallic
substrate having a composition com-
prised of nickel; and a thermal barri-
er coating on a surface of the metal-
lic substrate, the thermal barrier
coating comprised of, a metal-ceram-
ic mixture, the metal-ceramic mix-
ture comprised of yttria stabilized
zirconia dispersed with aluminum
particles, nickel-aluminum inter-
metallic phases interposed between
the metal-ceramic mixture and the
surface of the metallic substrate, the
nickel-aluminum intermetallic phas-
es formed by a diffusion process
between the metal-ceramic mixture
and the metallic substrate.
DSM PATENTS
MULTILAYER COATING
Patent No. U.S. 7,740,944 B2
DSM IP Assets B.V. has been granted
a patent for a multilayer coating in
which a plurality of photocurable
resin cured films are layered, where-
in at least two adjacent layers com-
prise the same hindered phenol
antioxidant in different amounts, and
wherein the antioxidant has at least
one hindered phenol group, the hin-
dered phenol group containing none
or only one sterically hindered alkyl
group selected from the group con-
sisting of an i-propyl group, an i-butyl
group, and a tert-butyl group and
wherein the adjacent layers comprise
urethane meth(acrylate), wherein the
multilayer coating further is com-
prised of an amine compound; where-
in the amine compound is present in
the multilayer coating to prevent the
generation of hydrogen gas.
DU PONT DE NEMOURS PATENTS
AUTOMOTIVE REFINISH COATING
Patent No. U.S. 7,737,243 B2
E. I. du Pont de Nemours and Company
has obtained a patent for urea-contain-
ing polyisocyanate adduct mixture con-
sisting essentially of the reaction prod-
uct of at least one aliphatic isocyanate
trimer; and at least one cycloaliphatic
isocyanate trimer in the presence of a
urea-forming agent; and wherein the
mole ratio of the aliphatic to
cycloaliphatic trimer is in the range of
from 1:2 to 1: 10 and the reaction prod-
uct has a molecular weight average of
from 500 to 3000 and an isocyanate
functionality of at least 4.
CIBA PATENTS
FLUORESCENT WHITENING AGENTS
Patent No. U.S. 7,731,820 B2
Ciba Specialty Chemicals Corporation
has received a patent for a composi-
tion comprised of at least one water-
soluble fluorescent whitening agent, a
water-soluble polymer consisting of
acrylamide only or acrylamide and
other monomers, the monomers are
selected from the group consisting of
methacrylamide, N-alkyl acry-
lamides, N-alkyl methacrylamides, N-
hydroxy acrylamides, N,N-dialkyl
acrylamides, N,N-dialkyl methacry-
lamides, N,N-di(hydroxyalkyl) acry-
lamides, morpholino acrylamide,
acrylic acid, methacrylic acid, itaconic
acid, crotonic acid, 2-acrylamido-2-
methylpropane sulphonic acid, allyl
sulphonic acid and vinyl sulphonic
acid, whereby the acidic monomers
are in the form of their free acid or
water-soluble salts and the water-sol-
uble polymer has an average (weight
average) molecular weight of between
500 and 49,000, optionally; polyethyl-
ene glycol with a weight average
molecular weight of between 500 and
6000 and water.
PROCESS FOR THE PREPARATION OF
ANTIMICROBIAL POWDER COATING
Patent No. U.S. 7,736,694 B2
Dupont Polymer Powders has
received a patent for a process of
preparation of an antimicrobial pow-
der coating composition comprised of
the steps of transforming a natural
antimicrobial agent into a salt-form
and micronizing the resulting
antimicrobial salt into powder, mix-
ing at least one of the natural
antimicrobial salt together with at
least one amino-reactive thermoplas-
tic binder resin, subjecting the mix-
ture to a melt compounding process
at a temperature in a range of 80° C
to 230° C, at a residence time period
in a range of 5 to 60 seconds, using at
least one co-rotating twin-screw
extruder with a soft screw design
having conveying elements offering a
high D/d ratio and having mixing for-
ward kneading block elements, cool-
ing the extrudate and micronizing
into powder particles. CW
