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US 9,428,613 B2Granted
Process for producing polyamide that is stable during processing
AssigneeBASF SE
InventorsRolf-Egbert Grützner, Shankara Narayanan Keelapandal Ramamoorthy, Faissal-Ali El-Toufaili, Achim Gerstlauer, Achim Stammer
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Abstract
Process for producing polyamides that are stable during processing, by treating the polyamide during the solid-phase postcondensation process with a gas which comprises carrier gas (inert gas), water, and acid, or an anhydride or lactone or a mixture of these or, respectively, comprises ammonia, or amine, or a mixture of these, at a temperature from 130 to 200° C. and at a pressure of from 0.01 to 10 bar.
Claims20
A process for producing a polyamide which comprises
- 1) preparing a gas by
- metering a mixture comprising
- a) an acid, an anhydride, a lactone, a mixture of the acid, the anhydride and the lactone, ammonia, an amine, or a mixture of ammonia and the amine,
- b) water, and
- c) a carrier gas inert at a temperature of from 130 to 200° C. and a pressure of from 0.01 to 10 bar to form a prepared gas
- directly into a stream comprising the carrier gas inert at a temperature of from 130 to 200° C. and a pressure of from 0.01 to 10 bar at a solid-phase postcondensation apparatus;
- and
- 2) subsequently treating a polyamide during solid-phase postcondensation process with the prepared gas at a temperature of from 130 to 200° C. and at a pressure of from 0.01 to 10 bar, yielding a polyamide which is stable during subsequent processing.
5 more elements
A process which comprises
- 1) preparing a gas by
- atomizing a mixture comprising
- a) an acid, an anhydride, a lactone, a mixture of the acid, the anhydride and the lactone, ammonia, an amine, or a mixture of ammonia and the amine,
- b) water, and
- c) a carrier gas inert at a temperature of from 130 to 200° C. and a pressure of from 0.01 to 10 bar to form a prepared gas
- by ultrasound in the range from 25 KHz to 3 MHz;
- and
- 2) subsequently treating a polyamide during solid-phase postcondensation with the gas at a temperature of from 130 to 200° C. and at a pressure of from 0.01 to 10 bar, yielding a polyamide which is stable during subsequent processing.
5 more elements
A process for producing a polyamide, which comprises
- 1) preparing a gas by
- heating a mixture comprising
- a) an acid, an anhydride, a lactone, a mixture of the acid, the anhydride and the lactone, ammonia, an amine, or a mixture of ammonia and the amine,
- b) water, and
- c) a carrier gas inert at a temperature of from 130 to 200° C. and a pressure of from 0.01 to 10 bar to a temperature in the range from 100 to 300° C.;
- and
- 2) subsequently treating a polyamide during solid-phase postcondensation with the gas at a temperature of from 130 to 200° C. and at a pressure of from 0.01 to 10 bar, yielding a polyamide which is stable during subsequent processing.
4 more elements
Dependencies are inferred from the claim text.