Dimethyl isophthalate Chemical Properties

Melting point:

64-68 °C (lit.)

Boiling point:

124 °C (12.0016 mmHg)

Density 

1.1477

vapor density 

6.8 (vs air)

vapor pressure 

93.7 mm Hg ( 208 °C)

refractive index 

1.5168 (estimate)

Flash point:

138 °C

storage temp. 

Sealed in dry,Room Temperature

solubility 

0.29g/l insoluble

form 

Flakes or Crystalline Powder

pka

-5.32[at 20 ℃]

color 

White to off-white

Water Solubility 

Insoluble

BRN 

1912251

LogP

2.1 at 20℃

CAS DataBase Reference

1459-93-4(CAS DataBase Reference)

NIST Chemistry Reference

1,3-Benzenedicarboxylic acid dimethyl ester(1459-93-4)

EPA Substance Registry System

Dimethyl isophthalate (1459-93-4)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36

Safety Statements 

26-36

WGK Germany 

3

RTECS 

NT2540000

TSCA 

Yes

HS Code 

29173980

Hazardous Substances Data

1459-93-4(Hazardous Substances Data)

MSDS

• Language:English Provider:Dimethyl isophthalate
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

Dimethyl isophthalate Usage And Synthesis

Chemical Properties

white to off-white flakes or crystalline powder. Soluble in methanol, ethanol, insoluble in water, used in organic synthesis, as a fixed plate for gas chromatography.

Uses

Dimethyl isophthalate is used as a plasticizer, to make polyester resins, as a polyacrylate resin comonomer, and as a perfume fixative. It may be used as an internal standard for determining, dimethyl-tere-phthalate (DMtP), dimethyl-phthalate (DMP), diethyl phthalate (DEP) in soil samples and biosolids using gas-chromatography coupled to mass spectrometry (GC-MS). It may also be used as an analytical reference standard for the quantification of the analyte in complex matrices including plastics, cosmetics, and environmental samples using gas chromatography coupled to positive chemical ionization mass spectrometry (GC-CIMS).

Application

Dimethyl isophthalate was used in the synthesis of:
polybutylene isophthalate end-capped with N-ethyl-pentadecafluorooctanamide.
poly(ethylene terephthalate-co-isophthalate-co-5-tert-butylisophthalate) terpolyesters.
Polyesters containing sulfonate groups were prepared from dimethyl isophthalate, BD and 5SIPNa by the usual two-stage crystallization.

Preparation

Dimethyl isophthalate is synthesized by esterifying isophthalic acid with methanol: Isophthalic acid (1.66gm, 0.1mmol) in super dry methanol (60mL) containing 2-3 drops of concentrated H2SO4 (AR) was refluxed till it dissolved. Then, the reaction mixture was poured onto ice cold water, immediately a solid started separating from the clear solution. To this a solution of sodium bicarbonate was added till the effervescence seized. The ester thus obtained was filtered and washed with water for several times (M.P: 64-67°C).

Synthesis Reference(s)

Tetrahedron Letters, 33, p. 1959, 1992 DOI: 10.1016/0040-4039(92)88113-J

General Description

Dimethyl isophthalate is dimethyl phthalate ester based plasticizer.

Flammability and Explosibility

Non flammable

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