Claims
- 1. In a process for increasing the particle size of a product predominant in N,N'-alkylene-bis(tetrabromophthalimide) or N,N'-bis(tetrabromophthalimide), said product being produced of the reaction of tetrabromophthalic anhydride and a diamine of the formula H.sub.2 N--(R).sub.b --NH.sub.2 where R is methylene or ethylene and b =0 or 1, said reaction occuring in the presence of a solvent which contains at least about 15 weight percent of a mono-, di- or tri-carboxylic acid having a dissociation constant not higher than 8.5.times.10.sup.-5 at 25.degree. C., the improvement which comprises digesting said product at a temperature of at least 125.degree. C. for a period of time within the range of from about 1 hour to about 24 hours to effect said increase in particle size.
Parent Case Info
This application is a continuation of application Ser. No. 442,780, filed Nov. 28, 1989, now abandoned, which in turn is a continuation of application Ser. No. 210,328, filed Jun. 23, 1988, now U.S. Pat. No. 4,914,212.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
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0023420 |
Feb 1981 |
EPX |
2926638 |
Jan 1981 |
DEX |
Continuations (2)
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Number |
Date |
Country |
Parent |
442780 |
Nov 1989 |
|
Parent |
210328 |
Jun 1988 |
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