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UCARMAG® Binder 527<br />
A high molecular weight copolymer comprised of vinyl<br />
chloride, vinyl acetate, a hydroxy-alkyl acrylate and a<br />
carboxylated monomer. The vinyl chloride content is<br />
about 80 percent by weight and the hydroxyl content is<br />
about 1.8 percent. The molecular weight and physical<br />
properties of UCARMAG Binder 527 are similar to those<br />
of VAGF. A carboxyl monomer in the UCARMAG Binder 527<br />
gives the terpolymer excellent wetting and pigment<br />
dispersion properties and has made the resin especially<br />
useful in magnetic tape coatings containing neutral<br />
or basic pigments. Because of its unique functionality,<br />
UCARMAG 527 might also be considered as a binder for<br />
printing inks, paper coatings and general metal finishes.<br />
UCARMAG® Binder 569<br />
A medium molecular weight terpolymer containing<br />
vinyl chloride, vinyl acetate and a monomer with metal<br />
sulfonate functionality. The vinyl chloride of the terpolymer<br />
is about 85 percent by weight. The sulfonate functional<br />
monomer provides the terpolymer with exceptional wetting<br />
characteristics which make it an excellent dispersing<br />
medium for high surface area pigments used in magnetic<br />
media applications. Since the terpolymer has excellent<br />
Solutions<br />
Several criteria must be weighed in choosing solvents<br />
and diluents for UCAR Solution <strong>Vinyl</strong> <strong>Resins</strong>:<br />
■ Solvent Strength<br />
■ Volatility<br />
■ Toxicity<br />
■ Odor<br />
■ Cost<br />
■ Flammability<br />
■ Type of Application<br />
UCAR Solution <strong>Vinyl</strong> <strong>Resins</strong> are readily dissolved<br />
into clear solutions at room temperature by ketones,<br />
nitroparaffins, esters, and chlorinated hydrocarbons.<br />
heat stability, it can be used in applications requiring<br />
high shear milling operations to disperse high surface<br />
area or highly porous pigments. UCARMAG Binder 569,<br />
because of its sulfonate functionality, may also be useful<br />
in other non-magnetic media applications where good<br />
dispersing capabilities are needed.<br />
Solution <strong>Vinyl</strong> <strong>Resins</strong> for<br />
VOC-Compliant Coatings<br />
Since their commercialization about 50 years ago,<br />
UCAR® Solution-Polymerized <strong>Vinyl</strong> <strong>Resins</strong> have become<br />
the standards for a wide range of coatings applications.<br />
UCAR Waterborne <strong>Vinyl</strong> Resin Dispersions have been<br />
developed for compliant waterborne coatings, adhesives,<br />
and inks. These waterborne resin dispersions utilize a<br />
solution-polymerized vinyl resin backbone that has been<br />
chemically modified to allow dispersion in water.<br />
In general, ketones are the most suitable solvents<br />
for vinyl resins. Compared to other solvents, ketones<br />
yield higher resin concentrations without gelling and<br />
lower solution viscosities at equivalent solids content.<br />
Because of their solvency, they tolerate greater dilution<br />
with economical hydrocarbon diluents and exhibit<br />
better storage stability. Figure 1 compares the solvent<br />
strength of different ketones for VYHD.<br />
Esters are useful in applications where minimal<br />
attack on the substrate is desirable (as with coatings on<br />
plastics). Because of their low solvency for vinyls, they<br />
should be used in combination with other active solvents.<br />
Urethane-grade esters are preferred for minimum<br />
viscosity and optimum viscosity stability. Figure 2 compares<br />
the solvent strength of different esters for VYHD.<br />
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