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US 11,299,588 B2Granted
Polyamide synthesis method
AssigneeArkema France
InventorsThierry Briffaud, Pierre Nogues, Guillaume Le, Frédéric Malet
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Abstract
The invention concerns a method for producing polyamide from an amino ester of formula NH2—(CH2)n—COOR, in which R represents an alkyl group and n represents an integer ranging from 5 to 14, comprising: a first reaction step in the presence of water, at a first temperature; followed by a second reaction step at a second temperature higher than the first temperature.
Claims17
A process for producing a polyamide comprising:
- a first reaction step of hydrolyzing an amino ester of formula NH2—(CH2)n—COOR in the presence of water at a first temperature wherein said first temperature is lower than or equal to 120° C., wherein R represents an alkyl group and n represents an integer ranging from 9 to 14;
- followed by a second reaction step of polymerizing at a second temperature higher than the first temperature;
- wherein said second temperature is at least 50° C. higher than the first temperature;
- wherein the first reaction step partially continues into the second reaction step, and wherein the water from the first reaction step is eliminated in the second reaction step, and wherein the polyamide formed from said process possesses a residual content of ester chain ends greater than 0.1 μeq/g.
1 more element
A process for producing a polyamide comprising:
- a first reaction step of hydrolyzing an amino ester of formula NH2—(CH2)n—COOR in the presence of water at a first temperature, wherein R represents an alkyl group and n represents an integer ranging from 9 to 14;
- followed by a second reaction step of polymerizing at a second temperature higher than the first temperature;
- wherein said second temperature is at least 50° C. higher than the first temperature;
- and wherein the process further comprises:
- before the first reaction step or at the start of the first reaction step, addition of a catalyst for the hydrolysis of the amino ester,
- wherein the first reaction step partially continues into the second reaction step, and wherein the water from the first reaction step is eliminated in the second reaction step, and wherein the polyamide formed from said process possesses a residual content of ester chain ends greater than 0.1 μeq/g.
3 more elements
Dependencies are inferred from the claim text.