Coatings World - August 2012

pared such that the clear coating composition includes 25% to 50% mass of a soft segment part with respect to a total solid content of the hydroxyl group-containing acrylic resin and the polyfunctional isocyanate compound, a ratio of a soft segment part derived from a lactone-containing monomer with respect to the total solid content of the hydroxyl group-containing acrylic resin and the polyfunctional isocyanate compound is not more than 4.5% mass, a content ratio of the soft segment part in the hydroxyl-group containing acrylic resin is 7% to 30% mass with respect to the solid content of the hydroxyl group-containing acrylic resin, a content ratio of the soft segment part in the polyfunctional isocyanate compound is not greater than 60% mass with respect to the solid content of the polyfunctional isocyanate compound, and that a dynamic glass transition temperature of a cured coating film obtained from the clear coating composition is within a range of 30˚ to 60° C, the soft segment part being represented by the formula —(CH2)n— (1) wherein n represents an integer of 4 or more, and the soft segment part being present in a main chain or in a cross-linking chain in the clear coating composition.

Whitford patents non-stick
coating
U.S. 8,147,915 B2
Whitford Corporation has been granted a
patent for a non-stick coating composition
comprised of at least 40% weight based on
total solids of the composition a waterborne
phenoxy resin, the phenoxy resin lacking ter-
minal epoxy groups; a crosslinker; at least
more than 5% weight based on total solids
of the composition of a silicone compound;
and from 5% to 30% weight based on total
solids of the composition of a fluoropolymer.

Valspar patents bisphenol a and aromatic glycidyl ether-free coating U.S. 8,142,858 B2 Valspar Sourcing has been granted a patent for a hardenable packaging coating composition comprised of an under-coat composition, containing: a polyester (co)polymer, and an under-coat cross-linker; and an over-coat composition, containing: a poly(vinyl chloride) (co)polymer dispersed in a substantially nonaqueous over-coat carrier liquid, an over-coat cross-linker, and a functional (meth)acrylic (co)polymer; wherein the packaging coating composition is substantially free of mobile Bisphenol A, Bisphenol F, Bisphenol A diglycidyl ether, and Bisphenol F diglycidyl ether.

American Thermal Holding
patents flexible protective
coating
U.S. 8,153,034 B2
American Thermal Holding Company has
obtained a patent for a fire-retardant com-
position comprised of a latex binder; at least
approximately 30% by weight of alumina
trihydrate having at least a bimodal distri-
bution of particle sizes comprised of a first
powder of alumina trihydrate having a first
median particle diameter between approxi-
mately 0.1 and about 20 microns, and a sec-
ond powder of alumina trihydrate having a
second median particle diameter between
approximately 5 and 100 microns; wherein
the second median particle diameter is larger
than the first median particle di-
ameter; and a surfactant.

Kao patents pigments U.S. 8,153,163 B2 Kao Corporation has been granted a process for producing a pearl pigment comprised of adding an aqueous solution of a colored metal oxide precursor to an aqueous dispersion of a flaky powder so that the amount of metal ion is 5× 10− 4 to 12× 10− 4 mol/min per 100 g of the flaky powder; adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the solid from the mixed solution; baking the separated solid at 500 to 1000° C to obtain a pearl pigment; suspending the obtained pearl pigment in water; adding an aqueous solution of a colorless metal or colorless metal oxide precursor to the suspension; adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the solid from the mixed solution; and baking the separated solid at 500 to 1000° C; or adding an aqueous solution of a colored metal oxide precursor to an aqueous dispersion of a flaky powder so that the amount of metal ion is 5× 10− 4 to 12× 10− 4 mol/min per 100 g of the flaky powder; adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the obtained solid from the mixed solution; adding an aqueous solution of a colorless metal or colorless metal oxide precursor to a dispersion of the solid; separating the obtained solid from the mixed solution; and baking the separated solid at 500 to 1000° C. CW

Sudarshan Wins Patents Case Against Clariant

Sudarshan wins patent case involving its Sudafest 132 pigment against Clariant

A judgement was handed down by a European court in June that Clariant Produkte (Deutschland GmbH), a German pigment manufacturer had been wrongfully claiming that Sudafast 132 (PY191) infringed its patent. It was also held that Clariant had issued unlawful threats to potential customers of Sudarshan. The court will now assess damages to be paid by Clariant to Sudarshan as a result of its wrongful threats. The court specifically stated that Sudarshan did not infringe Clariant's patent. As the largest producer of pigments in India, Sudarshan manufactures an extensive range of organic, inorganic, and pearlescent pigments and dispersions catering to the coatings, plastics, inks and cosmetics industries worldwide. The product offerings of Sudarshan's brands include Sudaperm, Sudafast, Sudacolor, Sumica, and Sumicos. Sudarshan's development focus is on high performance pigments mainly for automotive coatings and plastics.