Claims
- 1. In a process for the preparation of thermoplastic copolyamide adhesive resins by the reaction of essentially stoichiometric amounts of reactants consisting essentially of (a) a mixture of adipic acid and a long-chain aliphatic saturated dicarboxylic acid having 8 to 14 carbon atoms, (b) piperazine and (c) a polyoxyalkylene diamine of the general formula ##STR2## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800, the improvement which comprises heating the adipic acid, long-chain aliphatic saturated dicarboxylic acid and polyoxyalkylene diamine at 160.degree. C. to 220.degree. C. with agitation under an inert atmosphere and adding piperazine as an anhydrous melt or aqueous solution at a rate to avoid polymeric salt formation.
- 2. The process of claim 1 wherein the long-chain aliphatic saturated dicarboxylic acid is azelaic acid or sebacic acid, the polyoxyalkylene diamine is a polyoxypropylene diamine having an average molecular weight from 300 to 600, the equivalents ratio of adipic acid to azelaic or sebacic acid ranges from 0.5:0.5 to 0.9:0.1 and the equivalents ratio of piperazine to polyoxypropylene diamine ranges from 0.7:0.3 to 0.95:0.5.
Parent Case Info
This is a division of application Ser. No. 011,456, filed Feb. 2, 1979.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3377303 |
Peerman et al. |
Apr 1968 |
|
3738950 |
Sturwold et al. |
Jun 1973 |
|
3882090 |
Fagerburg et al. |
May 1975 |
|
4153784 |
Horn et al. |
May 1979 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
11456 |
Feb 1979 |
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