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 |  | 
                        
                            | 4745216 | Keggenhoff et al. | May 1988 |  | 
                        
                            | 4948917 | Steuernagel | Aug 1990 |  | 
                
            
                        Divisions (2)
        
            
                
                    |  | Number | Date | Country | 
            
            
    
        | Parent | 695899 | May 1991 |  | 
    
        | Parent | 560512 | Jul 1990 |  | 
            
        
        Continuations (1)
        
            
                
                    |  | Number | Date | Country | 
            
            
    
        | Parent | 720164 | Jun 1991 |  |