Claims
- 1. A method of manufacture of isocyanate-substituted isophthaloyl chloride comprising, forming a mixture of amino-substituted isophthalic acid, catalyst, phosgene and halogenated solvent,
- heating said mixture in a pressure vessel under autogenous pressure,
- treating said mixture to remove said solvent, and
- distilling said mixture to yield said isocyanate-substituted isophthaloyl chloride.
- 2. The method of claim 1 wherein said isocyanate substituted isophthaloyl chloride is selected from the group consisting of 2-isocyanatoisophthaloyl chloride, 4-isocyanatoisophthaloyl chloride, and 5-isocyanatoisophthaloyl chloride.
- 3. The method of claim 1 wherein said amino-substituted isophthalic acid is 5-aminoisophthalic acid.
- 4. The method of claim 3 wherein said catalyst is imidazole.
- 5. The method of claim 4 wherein said halogenated solvent is chlorinated benzene.
- 6. The method of claim 5 wherein said isocyanate-substituted isophthaloyl halide is 5-isocyanatoisophthaloyl chloride.
Parent Case Info
This is a division of application Ser. No. 07/720,164, filed Jun. 27, 1991, which is a divisional application Ser. No. 07,/695,899 filed on May 6, 1991, issued as U.S. Pat. No. 5,084,182; which is a divisional of application Ser. No. 07/560,512 filed on Jul. 31, 1990, issued May 28, 1991 as U.S. Pat. No. 5,019,264 and subsequently allowed Jan. 24, 1992 as a reissued application Ser. No. 07/784,245 filed Oct. 29, 1991.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3607903 |
Csuros et al. |
Sep 1971 |
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4745216 |
Keggenhoff et al. |
May 1988 |
|
4948917 |
Steuernagel |
Aug 1990 |
|
Divisions (2)
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Number |
Date |
Country |
Parent |
695899 |
May 1991 |
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Parent |
560512 |
Jul 1990 |
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Continuations (1)
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Number |
Date |
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Parent |
720164 |
Jun 1991 |
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