Process for synthesizing polyamide pa 6-6
AssigneeArkema France
InventorJean-Luc DUBOIS
Life of this patent
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Abstract
A process for synthesizing polyamide PA 6-6, including a first step of reacting, in the presence of water, a compound of R0COO—(CH2)4—COOR′0 in which R0 and R′0, which may be identical or different, represent H or a linear or branched alkyl radical comprising from 1 to 4 carbon atoms, with hexamethylenediamine (HMDA), at a temperature of less than or equal to 160° C., to form a reaction medium, and then a second step of heating the reaction medium to a temperature of greater than or equal to 200° C.; the reaction medium also including a compound of R1—COO—(CH2)n—CH═CH—(CH2)n—COO—R2 and/or a compound of R3—(CH2)m—CH═CH—(CH2)n—COO—R4.
Claims16
A process for synthesizing polyamide PA 6-6, comprising:
- a first step of reacting, in the presence of water, a compound of formula (I):
- R0—OOC—(CH2)4—COO—R′0 (I)
- in which R0 and R′0, which may be identical or different, represent H or a linear or branched alkyl radical comprising from 1 to 4 carbon atoms,
- with hexamethylenediamine (HMDA), to form a reaction medium, and then
- a second step of heating the reaction medium to a temperature of greater than or equal to 200° C.;
- the reaction medium also comprising:
- a compound of formula (A):
- R1—OOC—(CH2)n—CH═CH—(CH2)n—COO—R2 (A)
- and/or a compound of formula (B):
- R3—(CH2)m—CH═CH—(CH2)n—COO—R4 (B)
- in which:
- R1, R2 and R4, which may be identical or different, represent H or a linear or branched alkyl radical comprising from 1 to 4 carbon atoms,
- R3 represents —CN or —COO—R5, R5 representing H or a linear or branched alkyl radical comprising from 1 to 4 carbon atoms,
- m represents 0, 1 or 2 and n is an integer between 7 and 13, limits inclusive.
A polyamide PA 6-6 comprising at least one residue chosen from the group constituted by the residues of formulae (A′) and (B′):
- —[CO—(CH2)n—CH═CH—(CH2)n,—CO]— (A′),
- —[CO—(CH2)m—CH═CH—(CH2)n—CO]— (B′),
- in which m represents 0, 1 or 2 and n is an integer between 7 and 13, limits inclusive.
Dependencies are inferred from the claim text.