BASF patents titania-pigmented polyamide
Patent No. U.S. 7,820,757 B2
BASF has been awarded a patent for a
process for producing a polyamide with titanium dioxide pigments comprised of dispersing the titanium dioxide pigments in a
mixture containing water and caprolactam
with an apparatus. The apparatus is comprised of a dispersing chamber, a disk-shaped rotor disposed in the dispersing
chamber, a stator which has radial openings
and is disposed in conjunction with the
rotor in a dispersing zone of the dispersing
chamber, a product inlet on each side of the
rotor, such that a confluence of two product
streams from each of the product inlets is
disposed in an outer peripheral region of the
disk-shaped rotor, and a product outlet at
the outer periphery of the dispersing zone of
the dispersing chamber, by feeding the titanium dioxide pigments through one of the
product inlets and the mixture, containing
water and caprolactam, through the other
product inlet to the dispersing chamber, and
obtaining a product mixture, containing
water, caprolactam and the titanium dioxide pigment from the product outlet, and
polymerizing the product mixture to form
the polyamide containing titanium dioxide
pigments and wherein water is removed
from the product mixture before or during
the polymerization, blending the product
mixture with additional caprolactam followed by polymerizing the additional caprolactam to form a masterbatch and filtering
the masterbatch in a melt through a filter,
wherein an average mean pressure build-up
of the polymerized masterbatch, determined
as a difference between a final pressure and
an initial pressure upstream of the filter, divided by an amount put through, is approximately 7 bar/kg.
Eckart patents aluminum effect
pigments
Patent No. U.S. 7,828,890 B2
Eckart has been granted a patent for effect
pigments having an aluminum core or aluminum alloy core and an aluminum oxide-
containing or aluminum oxide/hydroxide-containing layer enveloping the aluminum
core or aluminum alloy core, obtained by
chemical wet-process oxidation of lamellar
aluminum pigments or aluminum alloy
pigments, the content of metallic aluminum
in the aluminum core or aluminum alloy
core being not more than 90% by weight,
based on the total weight of the pigment,
characterized in that the oxidized aluminum pigments or aluminum alloy pigments exhibit at least one highly refractive
metal chalcogenide layer having a refractive index of >1.95, the at least one metal
chalcogenide layer being a layer of an intrinsically colored metal chalcogenide, and
a mixed layer is formed between the highly
refractive metal chalcogenide layer and the
enveloping aluminum oxide-containing or
aluminum oxide/hydroxide-containing
layer, wherein the aluminum oxide-containing or aluminum oxide/hydroxide containing enveloping layer has a thickness of
from 50-300 nm and wherein the effect
pigments have a weak color flop having a ΔH*anchor in a range of between 1.5 and
50, and wherein the refractive index of the
mixed layer between the aluminum oxide-containing or aluminum oxide/hydroxide-containing layer and the highly refractive
metal chalcogenide layer exhibits a gradient perpendicularly to the pigment surface
extending from the refractive index of the
pure aluminum oxide/hydroxide-containing layer and the refractive index of the
highly refractive metal chalcogenide layer.
Excalibur Paint patents 2K
waterborne isocyanate free
coating system
Patent No. U.S. 7,951,869 B2
Excalibur Paint and Coatings, Ltd. has
been granted a patent for a 2K waterborne
isocyanate free coating system and methods thereof designed for use as a DTM topcoat in heavy duty industrial applications
where gloss retention, chemical and corrosion resistance are a primary requirement.
The waterborne acrylic epoxy composition
has < 50 g/l VOC and contains no isocyanates, and thus provides a high performing alternative for applications where
handling of and exposure to isocyanates is
prohibited and/or must be highly avoided.
Part A of the two component emulsion system is comprised of a blend of hydroxy
functional acrylic polymer co-reactant,
suitable additives, pigments and epoxy
resin, while Part B is preferably a waterborne amine hardener for curing or
crosslinking the first component. The new
coating can be applied in thicknesses ranging from 2 mils to approximately 16 mils
and cures without foaming even at high
film builds. The two component emulsion
system also calls for a water-based zinc
primer and zinc conversion coating primer
that have remarkable adhesion on a variety of substrates including, but not limited
to, aluminum, galvanized metal (both electroplated and hot-dipped), various stainless
steels, PVC, carbon/fiberglass composites,
and the like.
PPG patents method of
reducing mapping of an
electrodepositable coating
layer
Patent No. U.S. 2,010,316,881
PPG has received a patent related to the
method of reducing mapping of an electrodepositable coating layer. It concerns a
method for coating a substrate with a variety
of coating compositions thereby reducing
mapping of a coating composition deposited
onto the substrate. In certain embodiments,
the present invention is directed to the deposition of a zirconium-based pretreatment
composition onto a substrate with the subsequent deposition of an electrodepositable
coating composition, which comprises a soluble alkaline earth metal ion, onto the pretreatment composition. The present
invention is also directed to a coating system
comprising various layers deposited from the
coating compositions disclosed herein. CW
