| abstract |
AMORPHOUS OR AT MOST ONLY WEAKLY CRYSTALLINE, MELTFABRICATABLE AROMATIC POLYAMIDES PREPARED BY POLYCONDENSATION OF SPECIFIC AROMATIC DIAMINES IN WHICH THE AMINO GROUPS ARE ON NONADJACENT CARBON ATOMS AND AROMATIC DICARBOXYLIC ACIDS. REPRESENTATIVE DIAMINES ARE 4,4''-DIAMINODIPHENYL ETHER, M-PHENYLENE DIAMINE AND 4,4''-DIAMINODIPHENYL SULPHOXIDE WHILE EXAMPLES OF THE ACIDS INCLUDE THE MONO- AND POLY- ALKOXY DERIVATIVES OF ISOPHATHALIC AND TEREPHTHALIC ACIDS, DICARBOXYDIPHENYL ETHERS, BIS(CARBOXYPHENOXY) ALKANES AND BIS(CARBOXYPHENOXY)BENZENES. |