Polymer preparation

Patent metadata

Field	Value
Publication number	US-10858480-B2
Application number	US-201615780373-A
Country	US
Kind code	B2
Filing date	Nov 11, 2016
Priority date	Dec 2, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

The present disclosure relates to a preparation of polymer with improved color and properties. More particularly, the disclosure relates to the preparation of polyamide by introducing a polyetheramine additive during the polymer extrusion step. The extruded polymer is superior in appearance and spinnable in subsequent processing into yarn.

First claim

What is claimed is:

1. A process for making polyamide comprising:
a) feeding diacid and diamine to a first feed throat of a screw extruder, the screw extruder comprising a first melt zone and a first melt conveying zone downstream of the first feed throat;
b) at least partially polymerizing the diacid and the diamine to form a first polyamide;
c) feeding a polyetheramine additive to a second feed throat of the screw extruder downstream of the first melt conveying zone;
d) incorporating the polyetheramine additive with the first polyamide in a second melt zone and a second melt conveying zone; and
e) recovering a second polyamide from the screw extruder downstream from the second melt conveying zone, wherein:
i) the RV of the second polyamide using the or ASTM D789 method is from about 20 to about 60; or
ii) the amino end group (AEG) content is between about 15 mpmg and 130 mpmg;

wherein
the process further comprises feeding a second diacid to step (c) and incorporating the second diacid into the first polyamide in step (d), or
the polyetheramine additive comprises one or more additives, or
a combination thereof.

2. The process of claim 1 further comprising feeding a second diacid to step (c) and incorporating the second diacid into the first polyamide in step (d).

3. The process of claim 1 for making polyamide wherein, the polyetheramine additive is less thermally stable than the first polyamide.

4. The process of claim 1 for making polyamide wherein, the water regain of the second polyamide is greater than the water regain of the first polyamide.

5. The process of claim 1 for making polyamide wherein, the water regain of the second polyamide is >6 wt % to <30 wt %.

6. The process of claim 1 wherein the water regain of the second polyamide is from >10 wt % to <15 wt %.

7. The process of claim 1 for making polyamide wherein, the polyetheramine additive comprises one or more additives.

8. The process of claim 7 for making polyamide wherein the one or more additives comprise a catalyst.

9. The process of claim 8 for making polyamide wherein, the catalyst is chosen from a group consisting of phosphoric acid, phosphorous acid, hypophosphoric acid arylphosphonic acids, arylphosphinic acids, salts thereof, and mixtures thereof.

10. The process of claim 8 for making polyamide wherein, the catalyst is selected from a group consisting of sodium hypophosphite hydrate (SHP), manganese hypophosphite, sodium phenylphosphinate, sodium phenylphosphonate, potassium phenylphosphinate, potassium phenylphosphonate, hexamethylenediammonium bis-phenylphosphinate, potassium tolylphosphinate, and mixtures thereof.

11. The process of claim 1 further comprising adding an antioxidant or heat stabilizer to the first polyamide or the second polyamide.

12. The process of claim 11 wherein the antioxidant or heat stabilizer comprises a dicarboxylic acid.

13. The process of claim 12 wherein the dicarboxylic acid is adipic acid.

Assignees

• Invista North America Sarl

Inventors

• Langrick Charles Richard
• Hunt Garry S

Classifications

• C08G69/40 Primary

  Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence) · CPC title

• C08G69/04

  Preparatory processes · CPC title

• C08G69/46

  Post-polymerisation treatment · CPC title

• B29K2077/00

  Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material · CPC title

• C08G69/26

  derived from polyamines and polycarboxylic acids · CPC title