Aromatic diamine/aromatic dicarboxylate and production method thereof
AssigneeToyo Boseki Kabushiki Kaisha
InventorsKiyoshi Hotta, Fuyuhiko Kubota
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Abstract
The present invention provides aromatic diamine/aromatic dicarboxylate having the following formula (I) NH2—Ar1—NH2.HOOC—Ar2—COOH (I) wherein each symbol is as defined in the specification, which is in the form of particles having a median diameter of 5-100 μm and whiteness of not less than 75. This salt has high polymerizability and preferably has superior storage stability. Therefore, it can be preferably used for the production of polybenzazole that can be formed into a fiber and a film having high strength, high elastic modulus and high heat resistance.
Claims4
An aromatic diamine/aromatic dicarboxylate composition comprising an aromatic diamine/aromatic dicarboxylate of the following formula (I)
- NH2—Ar1—NH2·HOOC—Ar2—COOH (I)
- wherein Ar1 is a group of the following formula (a) or (b)
- wherein each z is independently an oxygen atom or a sulfur atom, and Ar2 is selected from the group consisting of the following formulas (c)-(f)
- wherein R1 and R2 are each independently a hydrogen atom, a methyl group or a hydroxyl group, which is in the form of particles having a median diameter of 5-100 μm and whiteness of not less than 75;
- and further comprising tin (II) or iron (II) in a proportion of 0.1 to 5.0 mol %.
Dependencies are inferred from the claim text.