Chemical Engineering February 2016 - 19

are offering new options for paint
formulators to reduce environmental
impact.
for example, Eastman's MAK
(methyl n-amyl ketone) and MIAK
(methyl isoamyl ketone) solvents
help offer routes to reduce VOC
emissions in coatings applications.
MAK and MIAK are high-boiling
specialty ketones with good solvent
activity and slow evaporation
rates. They allow paints to achieve
higher solids and lower emissions
while maintaining excellent flow
and leveling properties and optimal
spray viscosities, Eastman says.
Eastman's Hemsley says there
have been innovations in ultra-low
VOC and zero-emission coalescents,
molecules that help emulsion-based
paints form a film as the
water evaporates. Also, specialty
cross-linking monomers have been
introduced to polymer manufacturers,
which enable the polymers
contained in paint to perform at a
higher level while delivering lowVOC-emission
formulations.
Eastman's Texanol and Optifilm
products allow water-borne polymers
to be used in architectural
paints rather than requiring an organic
solvent-based system. " Optifilm
enhancer 400 allows the filmforming
mechanism to take place
without emissions, " Hemsley says.
Texanol ester alcohol helps the discrete
water-borne polymer particles
to coalesce and form a strong durable
film, he adds.
for industrial coating applications,
Eastman cellulose-ester products,
such as the family of Eastman Solus
performance additives, allow for rheology
control and metallic flake orientation
within higher-solids, loweremission
coatings.
Dow Coating Materials (Philadelphia,
Pa.; www.dowcoatingmaterials.com)
has also introduced several
paint-additive products that can help
reduce environmental impact and
lower VOC content. for the industrial
coatings market, Dow has developed
technology for improving the performance
of waterborne alkyd coatings.
Alkyds are polyesters modified by
adding fatty acid molecules, and they
have been used for industrial coatings
because of their excellent finish
properties. But low-VOC regulations
have reduced their use in many regions,
Dow says, and waterborne
alkyd emulsions haven't matched the
performance of solvent-borne alkyd
systems. Dow has developed technology
to disperse traditional highviscosity,
short-oil alkyds with minimal
surfactant and no polymer modification.
These attributes allow for the
formulation of pigmented waterborne
alkyd coatings with comparable dry
times, adhesion and hardness to
those of conventional solvent-borne
alkyd coatings.
In the architectural coatings market,
Dow has also developed binder
materials that can be formulated at
lower VOC levels, but that maintain
the hardness properties of a higherVOC
paint. Typical approaches to
Perfection is
Better Dispersion and Control
Perfecting Particle Size
The Sturtevant Micronizer®
jet mill reduces the
particle size of pesticides, herbicides, fungicides,
insecticides and dry chemicals to narrow particle
size distributions of 0.25 microns or larger without
heat buildup.
* Better control properties - dispersion & reactivity
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348 Circuit Street Hanover, MA 02339
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Circle 23 on p. 62 or go to adlinks.chemengonline.com/61492-23
ChemiCal engineering www.Chemengonline.Com february 2016
19
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Chemical Engineering February 2016

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