Isophthalic acid

Structural formula
General
Surname	Isophthalic acid
other names	m -phthalic acid 1,3-benzene dicarboxylic acid
Molecular formula	C 8 H 6 O 4
Brief description	colorless and almost odorless crystalline solid
External identifiers / databases
CAS number 121-91-5 EC number 204-506-4 ECHA InfoCard 100.004.098 PubChem 8496 Wikidata Q415253
properties
Molar mass	166.13 g mol −1
Physical state	firmly
density	1.54 g cm −3
Melting point	346 ° C
Sublimation point	348 ° C
Vapor pressure	610 Pa (250 ° C)
pK s value	pK s 1  = 3.62 pK s 2  = 4.60
solubility	sparingly soluble in water: 0.12 g l −1 (25 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
MAK	2 mg m −3 (inhalable aerosol fraction)
Toxicological data	10 400 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Isophthalic acid (also meta - phthalic acid ) is a chemical and belongs to the group of aromatic dicarboxylic acids ( benzene dicarboxylic acids ).

Physical Properties

The ignition temperature is 700 ° C.

Manufacturing

Isophthalic acid is produced by the oxidation of meta- xylene with atmospheric oxygen.

use

Isophthalic acid is used as a starting material for the production of aramids , polyesters , synthetic resins for high-temperature-resistant electrical insulating varnishes and oil-free alkyd resins .

Individual evidence

1. ↑ ^{a b c d e f g} Entry on isophthalic acid in the GESTIS substance database of the IFA , accessed on December 21, 2019(JavaScript required) .
2. ↑ ^{a b} Data sheet isophthalic acid (PDF) from Merck , accessed on August 14, 2007.
3. ↑ ^{a b c} CRC Handbook of Tables for Organic Compound Identification , Third Edition, 1984, ISBN 0-8493-0303-6 .
4. ↑ Entry on isophthalic acid. In: Römpp Online . Georg Thieme Verlag, accessed on July 17, 2014.