Coatings World - October 2012

represented as cumulative undersize distribution, with an h50 of 10 to 50 nm, and with an h90 of 20 to 70 nm. The platelet-shaped, copper-containing, metallic effect pigments are produced by milling a copper-containing metal powder with lubricant.

Eastman patents coating
compositions containing
tetramethyl cyclobutanediol
US 8,168,721 B2
Eastman Chemical Company has
patented a thermosetting coating com-
position, comprising: (A). about 2 to
about 50 weight percent, based on the
total weight of (A), (B), and (C) of a cur-
able polyester, comprising i. diacid
residues, comprising about 30 to about
70 mole percent of the residues of isoph-
thalic acid and about 70 to about 30
mole percent of the residues of adipic
acid, based on the total moles of diacid
residues; ii. diol residues, comprising
about 50 to 100 mole percent, based on
the total moles of diol residues, of the
residues of 2,2, 4,4-tetramethyl-1,3-
cyclobutanediol; and iii. about 3 to
about 30 mole percent of the residues of
at least one polyol, based on the total
moles of diol and polyol residues;
wherein said curable polyester has a
number average molecular weight of
about 500 to about 10,000 daltons, a
glass transition temperature of about
− 35° C. to about 100° C., a hydroxyl
number of about 20 to about 300 mg
KOH/g of polyester, and an acid number
of 0 to about 80 mg KOH/g of poly-
ester; (B). about 25 to about 88 weight
percent, based on the total weight of
(A), (B), and (C) of at least one acrylic
copolymer of ethylenically unsaturated
monomers comprising at least one hy-
droxyl, epoxy, carboxyl, blocked phe-
nol, or acetoacetoxy functional group;
and (C). about 10 to about 50 weight
percent, based on the total weight of
(A), (B), and (C), of at least one
crosslinker comprising at least one com-
pound reactive with a car-
boxylic acid or a hydroxyl
group; (D). about 10 to about
60 weight percent, based on the
total weight of (A), (B), (C), and (D) of
at least one non-aqueous solvent.

PPG patents polysiloxane
coating with hybrid copolymer

US 8,148,487 B2

PPG Industries Ohio, Inc. has patented a
coating comprising: a polysiloxane poly-
mer comprising the reaction product of:
(a) a hybrid copolymer comprising:
(i) a first monomer comprising hy-
droxypropylacrylate; and (ii) a second
monomer comprising methacry-
loxypropyltrimethoxysilane; and (b) a
second material comprising
methyltrimethoxysilane, wherein the hy-
brid copolymer is present in an amount
in the range of 5 weight percent to 40
weight percent based on the total weight
of the hybrid copolymer and the second
material. CW