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US 2017/0283557 A1Published application
Process of making hydrophilic polyamide without excessive foaming
AssigneeInvista North America S.A R.L.
InventorCharles Richard LANGRICK
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Abstract
The present invention relates to a process for making a hydrophilic polyamide without excessive foaming by delaying the introduction of the hydrophilic monomer. The hydrophilic monomer may be added to the polymerization process after at least a portion of the water has been removed from the process.
Claims20
A process for making polyamide comprising:
- (a) heating an aqueous solution of diacid and diamine to convert at least a portion of the diacid and diamine to polyamide;
- (b) removing water from the aqueous solution of (a) to at least partially concentrate the aqueous solution;
- (c) adding polyetheramine to the at least partially concentrated aqueous solution of (b);
- and
- (d) heating the solution of (c) to further polymerize the diacid, diamine and polyetheramine and to remove water from the solution.
2 more elements
A process for making polyamide comprising delaying introduction of a monomer providing hydrophilic functionality for incorporation into the polymer to a location in the process where water content is reduced.
A process for making polyamide comprising:
- (a) heating an aqueous solution of diacid and diamine to convert at least a portion of the diacid and diamine to polyamide and to remove water from the aqueous solution;
- and
- (b) injecting a hydrophilic additive to the partially concentrated aqueous solution of (a) to incorporate hydrophilic functionality into a resulting polyamide copolymer at an injection rate sufficient to provide a predetermined desired water regain while suppressing foaming of the at least partially concentrated aqueous solution by delayed introduction of the hydrophilic additive.
Dependencies are inferred from the claim text.