Polyamide from bis-carboxy containing 3,5,3',5'-tetraoxo-1,2-dipiperazine compound and diamine
AssigneeThe Dow Chemical Company
InventorEdmund P. Woo
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Abstract
The invention includes novel dicarboxylic acids derived from alkylene or arylene diaminetetraacetec acid corresponding to the formula ##STR1## These dicarboxylic acids derived from alkylene or arylene diaminetetraacetic acid are useful in the preparation of polyamides. Another aspect of the invention is a polymer prepared from between about 1 and 100 mole percent of the diamine salt of the compound represented by formula (I) ##STR2## These polymers are useful in preparing molded articles.
Claims8
A compound corresponding to the formula ##STR9## wherein R is a C.sub.1-20 alkylene group, phenylene group, arylalkylene group, cycloalkylene group, diphenylene group, or --R.sub.2 --X--R.sub.2 --;
- X is O, S or SO.sub.2 ;
- R.sub.2 is a C.sub.1-10 alkylene group, phenylene group, arylalkylene group or a cycloalkylene group;
- and
- R.sub.1 is a C.sub.1-20 alkylene group, phenylene group, arylalkylene group or a cycloalkylene group.
A process for the preparation of a dicarboxylic acid represented by the formula ##STR10## comprising contacting an alkylene or arylene diaminetetraacetic anhydride represented by the formula ##STR11## with an amine-substituted carboxylic acid represented by the formula
- H.sub.2 N--R.sub.1 --COOH (III)
- in a solvent comprising a high boiling phenolic compound and an aromatic hydrocarbon capable of forming an azeotrope with water, refluxing the mixture, and removing the water formed in the process as an azeotrope with the aromatic hydrocarbon, until such time as the azeotrope is water-free;
- wherein
- R is a C.sub.1-20 alkylene group, phenylene group, arylalkylene group, cycloalkylene group, diphenylene group, or --R.sub.2 --X--R.sub.2 --;
- X is O, S or SO.sub.2 ;
- R.sub.2 is a C.sub.1-10 alkylene group, phenylene group, arylalkylene group or a cycloalkylene group;
- and
- R.sub.1 is a C.sub.1-20 alkylene group, phenylene group, arylalkylene group or a cycloalkylene group.
Dependencies are inferred from the claim text.