Polycondensation process

Details Polycondensation process Polycondensation process

C - Chemistry, Metallurgy

08

G

402/187, 402/218

C08G 73/14 (2006.01) C08G 63/78 (2006.01) C08G 69/28 (2006.01) C08G 73/10 (2006.01)

Patent

CA 1226993

ABSTRACT OF THE DISCLOSURE A process for the manufacture of polyamides, polyam- ide-imides and polyimides which process comprises pre- paring 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 to 500°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°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°F to about 1000°F and melt temperatures of about 500°F to about 750°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 manufac- ture of polyesters and polyarylates by the process dis- closed above, except that instead of a salt, a prepolymer is prepared and the reactants for polyesters are dicar- boxylic acids and glycols, for polycarbonates, diphenols and phosgene, for polyarylates, diphenols and dicarbox- ylic acids and for polyesterarylates, dicarboxylic acids and phosgene.

446200

Affiliated with

Also associated with

Rating

Polycondensation process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polycondensation process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polycondensation process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1275552