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US 8,772,438 B2Granted
Preparation of polyamides
AssigneeInvista North America S.A.R.L.
InventorsKeith Whiston, Charles Richard Langrick, Kenneth Richard Seddon, Alberto V. Puga
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Abstract
A process for making a polyamide polymer, said process comprising heating, in one or more ionic liquid(s), one or more polyamide precursor(s) selected from: (i) one or more free dicarboxylic acid(s) or ester(s) thereof, with one or more diamine(s); or (ii) one or more salt(s) of a dicarboxylic acid with a diamine; or (iii) one or more lactam(s); or (iv) mixtures of any of the foregoing precursors (i) to (iii).
Claims18
A process for making a polyamide polymer, said process comprising:
- a) sparging one or more ionic liquid(s) with nitrogen for up to one hour;
- b) heating, in the one or more sparged ionic liquid(s), one or more polyamide precursor(s) to form the polyamide polymer, wherein the one or more polyamide precursor(s) is:
- (i) one or more free dicarboxylic acid(s) or ester(s) thereof, with one or more diamine(s);
- or
- (ii) one or more salt(s) of a dicarboxylic acid with a diamine;
- or
- (iii) one or more lactam(s);
- or
- (iv) mixtures of any of the foregoing precursors (i) to (iii);
- and
- c) recovering the one or more ionic liquid(s);
- wherein the heating is from about 3 to about 6 hours at a temperature from about 200° C. to 250° C.
9 more elements
A process for making a polyamide polymer, said process comprising:
- a) heating, in one or more ionic liquid(s), one or more polyamide precursor(s) to form the polyamide polymer, wherein the one or more polyamide precursor(s) is:
- (i) one or more free dicarboxylic acid(s) or ester(s) thereof, with one or more diamine(s);
- or
- (ii) one or more salt(s) of a dicarboxylic acid with a diamine;
- or
- (iii) one or more lactam(s);
- or
- (iv) mixtures of any of the foregoing precursors (i) to (iii);
- and
- b) continuously distilling off water formed during the heating;
- and
- c) recovering the one or more ionic liquid(s);
- wherein the heating is for up to about 10 hours at a temperature from about 200° C. to 250° C.
10 more elements
Dependencies are inferred from the claim text.