Flame-retardant thermoplastic polyurethane

Patent metadata

Field	Value
Publication number	US-12415905-B2
Application number	US-201917255656-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Jun 25, 2018
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The present invention relates to compositions comprising at least one thermoplastic polyurethane, a first phosphorus-containing flame retardant (F1) selected from the group consisting of melamine polyphosphates and a further phosphorus-containing flame retardant (F2) selected from the group consisting of derivatives of phosphinic acid, wherein the composition is free from melamine cyanurate, and to the use of such a composition for the production of cable sheathings.

First claim

The invention claimed is:

1. A composition, comprising:
(i) a thermoplastic polyurethane, wherein polyether diols or polycarbonate diols are used to produce the thermoplastic polyurethane,
(ii) a melamine polyphosphate as a first phosphorus-containing flame retardant (F1) in an amount of from 5% to 20% by weight based on a total composition,
(iii) a phosphinic acid derivative as a second phosphorus-containing flame retardant (F2) in an amount of from 10% to 35% by weight based on the total composition, and
(iv) a third phosphorus-containing flame retardant, which is a liquid phosphoric ester at 21° C., in an amount of from 2% to 10% by weight based on the total composition,
wherein the third phosphorus-containing flame retardant is selected from the group consisting of 1,3-phenylene bis(diphenyl)phosphate; 1,3-phenylene bis(dixylenyl)phosphate; resorcinol bis(diphenyl phosphate) (RDP); bisphenol A bis(diphenyl phosphate) (BDP); and diphenyl cresyl phosphate (DPC);
wherein the composition is free from melamine cyanurate, and
wherein the phosphorus-containing flame retardants in the composition consist of those selected from (i), (iii), and (iv).

2. The composition according to claim 1 , wherein the composition is free from 3-, 4-, 5- and 6-hydric alcohols.

3. The composition according to claim 1 , wherein the second phosphorus-containing flame retardant (F2) is a phosphinate.

4. The composition according to claim 3 , wherein the phosphinate is selected from the group consisting of an aluminum phosphinate and a zinc phosphinate.

5. The composition according to claim 1 , wherein the melamine polyphosphate has a phosphorus content of from 7% to 20% by weight.

6. The composition according to claim 1 , wherein the melamine polyphosphate has a particle size of from 0.1 to 100 μm.

7. The composition according to claim 1 , wherein the thermoplastic polyurethane is selected from the group consisting of a thermoplastic polyurethane based on at least one aromatic diisocyanate and at least one polycarbonate diol and a thermoplastic polyurethane based on at least one aromatic diisocyanate and polytetrahydrofuran polyol.

8. The composition according to claim 1 , wherein the composition comprises a mixture comprising thermoplastic polyurethane TPU-1 based on an aliphatic diisocyanate and thermoplastic polyurethane TPU-2 based on an aromatic diisocyanate.

9. The composition according to claim 1 , wherein a mixture of 1,4-butanediol and a further chain extender is employed as a chain extender to produce the thermoplastic polyurethane.

10. The composition according to claim 1 , wherein the thermoplastic polyurethane is present in the composition in an amount of from 60% to 93% by weight based on the total composition.

11. The composition according to claim 1 , wherein the composition comprises titanium dioxide in an amount of from 0.1% to 5% by weight based on the total composition.

12. A cable sheathing, comprising the composition according to claim 1 .

13. The composition according to claim 1 , wherein the third phosphorus-containing flame retardant is selected from the group consisting of resorcinol bis(diphenyl phosphate) (RDP) and diphenyl cresyl phosphate (DPC).

14. The composition according to claim 13 , wherein the thermoplastic polyurethane is selected from the group consisting of a thermoplastic polyurethane based on at least one aromatic diisocyanate and at least one polycarbonate diol and a thermoplastic polyurethane based on at least one aromatic diisocyanate and polytetrahydrofuran polyol.

15. The composition according to claim 14 , wherein the melamine polyphosphate has a phosphorus content of from 7% to 20% by weight.

16. The composition according to claim 14 , wherein the second phosphorus-containing flame retardant (F2) is a phosphinate.

17. The composition according to claim 16 , wherein the phosphinate is selected from the group consisting of an aluminum phosphinate and a zinc phosphinate.

18. The composition according to claim 17 , wherein the thermoplastic polyurethane is present in the composition in an amount of from 60% to 93% by weight based on the total composition.

19. The composition according to claim 17 , wherein the third phosphorus-containing flame retardant is resorcinol bis(diphenyl phosphate) (RDP).

20. The composition according to claim 17 , wherein the third phosphorus-containing flame retardant is diphenyl cresyl phosphate (DPC).

21. A composition, comprising:
(i) a thermoplastic polyurethane, wherein polyether diols or polycarbonate diols are used to produce the thermoplastic polyurethane,
(ii) a melamine polyphosphate as a first phosphorus-containing flame retardant (F1) in an amount of from 5% to 20% by weight based on a total composition,
(iii) a phosphinic acid derivative as a second phosphorus-containing flame retardant (F2) in an amount of from 10% to 35% by weight based on the total composition, and
(iv) a third phosphorus-containing flame retardant, which is a liquid phosphoric ester at 21° C., in an amount of from 2% to 10% by weight based on the total composition,
wherein the third phosphorus-containing flame retardant is selected from the group consisting of 1,3-phenylene bis(diphenyl)phosphate; 1,3-phenylene bis(dixylenyl)phosphate; resorcinol bis(diphenyl phosphate) (RDP); bisphenol A bis(diphenyl phosphate) (BDP); and diphenyl cresyl phosphate (DPC);
wherein the composition is free from melamine cyanurate, and
wherein the composition does not comprise alkyl esters of phosphoric acid.

Assignees

• Basf Se

Inventors

• Henze Oliver Steffen
• Muehren Oliver
• Nitz Birte
• Lange Tanja
• Moeller Sabine
• Bertels Alfons

Classifications

• H01B7/295

  using material resistant to flame · CPC title

• H01B3/302

  Polyurethanes or polythiourethanes; Polyurea or polythiourea · CPC title

• C08L75/08

  from polyethers · CPC title

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title