Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1984-02-23
1986-07-29
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528183, 528188, 528189, 528335, 528338, 528339, 528347, 528349, 528350, 528353, C08G 6928, C08G 7310, C08G 7314
Patent
active
046031936
ABSTRACT:
A process for the manufacture of polyamides, polyamide-imides and polyimides which process comprises preparing a salt of an aliphatic or aromatic diamine or a mixture of these and di, tri or tetracarboxylic acid or mixture of these or their corresponding anhydride by reacting both feedstocks at a temperature of about 300.degree. to 500.degree. F. in a solvent medium provided the water content of the resulting solution is below 25% water by weight the resulting salt solution is subjected to a pressure of about 1500-3000 psig and is then passed through a preheat zone where the temperature is increased to about 625.degree. F., the total residence time is kept at about 25 to about 50 seconds. The reactants are flashed through a control valve or nozzle to give an aerosol mist at a pressure of about 0-400 psig, the polymerization is further carried out in a flash reactor with a high heat flux and with wall temperatures of about 600.degree. F. to about 1000.degree. F. and melt temperatures of about 500.degree. F. to about 750.degree. F., the total polymer residence time in the reactor is kept about 0.1 to about 20 seconds. The novel compositions are useful for engineering resins. Also a process for the manufacture of polyesters, polycarbonates, polyarylates and polyesterarylates by the process disclosed above, except that instead of a salt a prepolymer is prepared and the reactants for polyesters are dicarboxylic acids and glycols, for polycarbonates, diphenols and phosgene, for polyarylates, diphenols and dicarboxylic acids and for polyesterarylates, dicarboxylic acids and phosgene.
REFERENCES:
patent: 3904577 (1975-09-01), Buisson
patent: 3984375 (1976-10-01), Frost
patent: 4313868 (1982-02-01), Hanson
Bolton Benjamin A.
Paschke Edward E.
Poppe Wassily
Richardson Joel A.
Amoco Corporation
Anderson Harold D.
Hensley Stephen L.
Magidson William H.
McClain William T.
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