Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1993-11-03
1995-05-16
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528335, 528338, 528339, 528340, 528346, C08G 6926
Patent
active
054161894
ABSTRACT:
Process for the synthesis of polyamides by polycondensation in a closed reactor of one or a number of dicarboxylic acids with a diamine compound containing not less than 60 mol % of-m-xylyenediamine, in which all the amount of diamine compound stoichiometrically necessary for the polycondensation reaction is quickly brought into contact with the molten acid, the temperature of the reaction mixture is raised to a value greater than the melting point of the polyamide produced, the pressure is only allowed to rise to a value sufficient to prevent solidification of the reaction mixture and a substantial loss of diamine compound and, at the end of the reaction, the pressure of the reaction mixture is reduced and the polyamide formed is recovered.
REFERENCES:
patent: 2130947 (1938-09-01), Carothers
patent: 2130948 (1938-09-01), Carothers
patent: 2840547 (1958-06-01), Stump
C. E. Schildknecht et al., Polymerization Processes, pp. 444 to 446, vol. XXIX of the series "High Polymers", Wiley Interscience Publication 1977. month of publication is not available.
Patent Abstracts of Japan, vol. 010, No. 043 (C-329), Feb. 20th, 1986; & JP-A-60 190 425 (Furukawa), Sep. 27th, 1985.
Gauthy Fernand
Momtaz Ardechir
Vandevijver Eric
Acquah Samuel A.
Hampton-Hightower P.
Solvay ( Societe Anonyme)
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