Isophthalic acid gives higher molecular weight resins than orthophthalic, with better drying characteristics and harder, more durable films.
Isophthalic acid is a boring glasslike strong. It is utilized as a middle of the road basically for unsaturated polyester pitches and alkyd and polyester covering tars; different applications remember use for aramid strands, as a segment of copolyester tars and in high-temperature polymers. Almost unadulterated isophthalic acid has a virtue of >99.8%. This material is called purged isophthalic acid or PIA. Isophthalic acid (1,3-benzenecarboxylic acid) is the meta type of phthalic acid. It is a white translucent strong subliming at 345°C. It is somewhat solvent in water, liquor and acidic acid (insoluble in benzene). Isophthalic acid is gotten by oxidizing meta-xylene with chromic acid, or by melding potassium meta-sulphobenzoate, or meta-brombenzoate with potassium formate. IPA has phenomenal execution attributes including uncommon hardness, erosion and stain obstruction, hydrolytic steadiness of coatings and gel coats, remarkable warm solidness and low sap tone in coatings ...