Conductive thermoplastic polyurethane

Patent metadata

Field	Value
Publication number	US-10692624-B2
Application number	US-201415029967-A
Country	US
Kind code	B2
Filing date	Oct 14, 2014
Priority date	Oct 15, 2013
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

The invention relates to a composition comprising a thermoplastic polyurethane, where the thermoplastic polyurethane has been prepared from a) a diisocyanate, b) a polyol comprising a polyol A and a polyol B and c) a chain extender, optionally with the aid of catalysts and optionally further comprising additives and/or auxiliaries, and a salt and/or an ionic liquid, preferably an ionic liquid, is comprised in the composition and the polyol A comprises ethoxy and propoxy groups and the polyol B comprises butoxy groups.

First claim

The invention claimed is:

1. A composition comprising:
a thermoplastic polyurethane; and
a salt and/or an ionic liquid;
wherein
the composition is a solid material, and
the thermoplastic polyurethane comprises as copolymerized components:
an aliphatic and/or cycloaliphatic diisocyanate,
a mixture of a polyol A which comprises ethoxy and propoxy groups, and
a polyol B which is a polytetramethylene glycol, and
an alkanediol chain extender.

2. The composition according to claim 1 , wherein a molar % of the ethoxy and propoxy groups in the polyol A is at least 5 mol % of the total of polyol A and a molar % of polytetramethylene glycol groups in the polyol B is at least 5 mol %, based on the total of polyol B.

3. The composition according to claim 1 , wherein a proportion of the ethoxy groups in the polyol A is at least 25 mol %, based on the total of polyol A.

4. The composition according to claim 1 , wherein the polyol B is a homopolymer.

5. The composition according to claim 1 , wherein the polyol A is a block copolymer having a block and two ends, and the block comprises ethoxy and propoxy groups and the two ends of the block copolymer consist of ethoxy groups.

6. The composition according to claim 5 , wherein a proportion of the ethoxy groups in the two ends of the block copolymer is more than 5 mol %, based on the total block copolymer.

7. The composition according to claim 1 , wherein an amount of the salt or the ionic liquid is from 0.1% by weight to 25% by weight, based on the weight of the thermoplastic polyurethane.

8. The composition according to claim 1 , wherein the chain extender is 1,3-propanediol and 1,4-butanediol, or 1,3-propanediol and 1,6-hexanediol, or 1,4-butanediol and 1,6-hexanediol, or 1,6-hexanediol.

9. The composition according to claim 1 , wherein the diisocyanate is an aliphatic diisocyanate.

10. A mixture comprising a polymer and a composition according to claim 1 .

11. The mixture according to claim 10 , wherein the polymer is at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyoxymethylene, ethylene-vinyl acetate, acrylonitrile-butadiene-styrene, polyvinyl chloride, and a thermoplastic polyurethane different from that of the composition.

12. The mixture according to claim 10 , wherein a proportion by weight of the composition in the mixture is from greater than 1% by weight to less than 50% by weight.

13. A method to reduce static charging of a polymer, comprising:
increasing the conductivity of the polymer by mixing the composition according to claim 1 with the polymer.

14. A process for producing the composition according to claim 1 , comprising:
preparing the thermoplastic polyurethane, and
mixing the thermoplastic polyurethane with a salt and/or an ionic liquid.

15. A process for producing the mixture according to claim 10 , comprising:
preparing the thermoplastic polyurethane;
mixing the thermoplastic polyurethane with a salt and/or an ionic liquid; and
mixing the thermoplastic polyurethane, salt and/or ionic liquid mixture with a polymer.

16. A thermoplastic polyurethane, comprising as copolymerized components:
an aliphatic and/or cycloaliphatic diisocyanate,
a mixture of a polyol A which comprises ethoxy and propoxy groups, and
a polyol B which comprises polytetramethylene glycol groups, and
an alkanediol chain extender.

Assignees

• Basf Se

Inventors

• Schaefer Frank
• Minder Ernst
• Kempfert Dirk
• Bahr Christoph
• Hinrichs Cornelia
• Oltmanns Anja

Classifications

• C08K2201/017

  Additives being an antistatic agent · CPC title

• C08K5/3445

  Five-membered rings · CPC title

• C08K5/0075

  Antistatics · CPC title

• C08G18/4837

  and other oxyalkylene units · CPC title

• C08G18/2027

  having two nitrogen atoms in the ring · CPC title