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Methyl tetrahydrophthalic anhydride is a chemical with a molecular formula of C9H10O3.

First, basic information of mthpa anhydride.

Name: Methyl Tetrahydrophthalic Anhydride

Alias: 1,2,3,6-TETRAHYDRO-3-METHYLPHTHALIC ANHYDRIDE;

1-METHYL-5-CYCLOHEXENE-2, 3-DICARBOXYLIC ANHYDRIDE;

3-METHYL-DELTA4-TETRAHYDROPHTHALIC ANHYDRIDE;

3-METHYLTETRAHYDROPHTHALIC ANHYDRIDE;

4-METHYL-1,2,3,6-TETRAHYDROPHTHALIC ANHYDRID;

4-METHYL-4-CYCLOHEXENE-1, 2-DICARBOXYLIC ANHYDRIDE;

4-METHYL-DELTA4-TETRAHYDROPHTHALIC ANHYDRIDE;

4-METHYL TETRAHYDROPHTHALIC ANHYDRIDE;

4-MTHPA;

Numbering: B1030

CAS No：26590-20-5  11070-44-3

Second, basic performance.

Methyl tetrahydrophthalic anhydride, referred to as MTHPA, MeTHPA, has two isomers, namely 4-methyltetrahydrophthalic anhydride and 3-methyltetrahydrophthalic anhydride, having a melting point of 65 °C and 63 °C. It is rarely used as a curing agent alone. The actual commodity is a liquid mixture that isomerized to various isomers. The molecular weight is 166.17, and light yellow color, transparent oily liquid, relative density of 1.20 - 1.22. Freezing point < -20 °C. The boiling point is 115-155 °C. Viscosity (25 °C) 40 - 80 mPa · s. The refractive index is 1.4960 to 1. 4980. The anhydride group content is ≥ 40%. The neutralization equivalent is 81-85. The flash point is 137 - 150 °C. Soluble in acetone, ethanol, toluene, etc. It has good stability in air and is not easy to precipitate crystals. Low toxicity, LD502102mg/kg.

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