Process for the preparation of polyamides with oligomer formation
AssigneeElf Atochem S.A.
InventorsPhilippe Maj, Jean-Marc Sage, Philippe Blondel, Didier Judas
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Abstract
A process for the manufacture of polyamides consisting essentially of the stages of: (i) reacting 10 to 90% by weight of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamines (c) with a lactam and/or corresponding amino acid (a) or the substantially stoichiometric combination of one or more aliphatic diamine(s) and of one or more dicarboxylic aliphatic acid(s) and with the aromatic diacid (b); and (ii) reacting the remainder of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamine (c) with the oligomer produced in stage (i) in one or more substages.
Claims19
A process for the manufacture of polyamides consisting of the following reactants:
- (a) lactam(s), corresponding amino acid(s) or the substantially stoichiometric combination of one or more aliphatic diamine(s) and of one or more dicarboxylic aliphatic acid(s), or a mixture thereof,
- (b) aromatic diacid(s) HOOC-Ar-COOH, where Ar is a divalent aromatic radical, and (c) cycloaliphatic, aliphatic, aromatic-aliphatic diamine(s) or a mixture thereof comprising the steps of:
- (i) reacting 10 to 90% by weight of the aliphatic, cycloaliphatic, aromatic-aliphatic diamine or a mixture thereof with the lactam, corresponding amino acid or the substantially stoichiometric combination of one or more aliphatic diamine(s) and of one or more dicarboxylic aliphatic acid(s) of a mixture thereof and with the aromatic diacid reactants, to produce a polyamide oligomer;
- and
- (ii) reacting the remainder of the aliphatic, cycloaliphatic, aromatic-aliphatic diamine(s) or a mixture therefore with the oligomer produced in stage (i) in one or more subsequent stages.
Dependencies are inferred from the claim text.