Claims
- 1. A method for making particulated substantially organic solvent-free polyetherimide which comprises heating particulated substantially organic solvent-free polyetheramide acid consisting essentially of chemically combined units of the formula, ##STR9## at a temperature in the range of from 135.degree. C. to 175.degree. C. until the resulting particulated product consists essentially of at least about 70 mole percent of chemically combined imide units of the formula, ##STR10## based on the total moles of chemically combined imide and amide acid units without a substantial degree of sintering occurring in the resulting particulated product, where the polyetheramide acid is the product of reaction of organic dianhydride and organic diamine utilized in a mole ratio of 1 mole of organic dianhydride, per 1 to 1.5 mole of organic diamine, where the organic dianhydride is selected from the group consisting of
- (A) aromatic bis(ether anhydride)s of the formula, ##STR11## (B) mixtures of 1 or more of said bis(ether anhydride)s with up to 30 mole percent of benzophenone dianhydride of the formula, ##STR12## with at least one organic diamine of the formula,
- H.sub.2 N--R--NH.sub.2,
- where said polyetheramide acid reaction product has a number average molecular weight of below about 5000,
- where Z is a member selected from ##STR13## and divalent organic radicals of the general formula, ##STR14## X is a member selected from the class consisting of divalent radicals of the formulas
- --C.sub.y H.sub.2 y--, --C--, ##STR15## --O--, and --S--, y is an integer from 1 to 5, and R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to about 20 carbon atoms and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, from C.sub.2 to about C.sub.8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula, ##STR16## Q is a member selected from the class consisting of --O--, --S--, and --C.sub.2 H.sub.2x --, where x is an integer from 1 to 5.
Parent Case Info
This is a continuation, of application Ser. No. 37,437, filed May 9, 1979, now abandoned.
US Referenced Citations (12)
Non-Patent Literature Citations (4)
Entry |
Dine-Hart et al., J. of Applied Poly. Sci. vol. 11, pp. 609-627, (1967). |
Kreuz et al., J. of Poly. Sci., (1966), pp. 2607-2616. |
Adrova et al., Polyimides (1970), pp. 27-44. |
Laivs et al., Polymer Sci. USSR (1967), pp. 2470-2478. |
Continuations (1)
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Number |
Date |
Country |
Parent |
37437 |
May 1979 |
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