acid, or benzene-1,3-dicarboxylic acid, is an aromatic
dicarboxylic acid, with formula C6H4(COOH)2.
acid is an isomer of phthalic acid and terephthalic acid.
Isophthalic acid melts above 300°.
acid can be obtained by oxidizing meta-xylene with chromic acid,
or by fusing potassium meta-sulphobenzoate, or meta-brombenzoate
with potassium formate.
- Uvitic acid,
5-methylisophthalic acid, is obtained by oxidizing mesitylene or
by condensing pyroracemic acid with baryta water.
resins containing PIA exhibit excellent outdoor weathering
relative to those containing phthalic anhydride and terephthalic
excellent hardness and high glass transition temperature imparted
by PIA leads to improved chemical, stain, humidity, and corrosion
resistance required in coatings for industrial maintenance,
automotive, aerospace, general metal and coil coating
coatings formulated with PIA are used in exterior applications
such as patio furniture, lawn mowers, vending machines, and
- One of the
largest applications for PIA is in unsaturated polyester resins
for high-quality gel coats.
hardness, stain and detergent resistance characteristics of PIA
are ideal for polyester solid-surface countertops that are an
inexpensive alternative to acrylics.
acid is an intermediate for certain high quality unsaturated
polyester resins, providing excellent structural properties,
corrosion resistance and weatherability in finished resins.
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