Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-03-03
1996-03-26
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528310, 528324, 5283291, 528335, 528336, 528338, 528339, 528340, 528347, C08G 6978
Patent
active
055021557
ABSTRACT:
A process for the manufacture of a partially aromatic polyamide is disclosed. The process comprises the polymerization stages of, in sequence, feeding to a reactor a slurry of at least one aromatic dicarboxylic acid and at least one aliphatic diamine, then with the incremental addition of water and in the presence of 0.05 to 2% by weight of a monocarboxylic acid, heating the slurry to a temperature of at least 270.degree. C. while maintaining a pressure of at least 1.2 MPa. The preferred dicarboxylic acid is 2,6 naphthalene dicarboxylic acid. The polyamides may be used in the manufacture of products using melt processing techniques.
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Du Pont Canada Inc.
Hampton-Hightower P.
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