Flame-retardant thermoplastic polyurethane

Patent metadata

Field	Value
Publication number	US-10047214-B2
Application number	US-201415106677-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 20, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The present invention relates to compositions comprising at least one thermoplastic polyurethane TPU-1 based on an aliphatic diisocyanate, at least one metal hydroxide and at least one phosphorus-containing flame retardant, especially those compositions which further comprise at least one thermoplastic polyurethane TPU-2 based on an aromatic diisocyanate. The present invention further relates to the use of such compositions for production of cable sheaths.

First claim

The invention claimed is:

1. A composition comprising at least one thermoplastic polyurethane TPU-1 based on an aliphatic diisocyanate, at least one metal hydroxide and at least one phosphorus-containing flame retardant,
wherein the composition further comprises at least one thermoplastic polyurethane TPU-2 based on an aromatic diisocyanate, and
wherein the proportion of the thermoplastic polyurethane TPU-2 in the composition is in the range from 0.1% to 65% based on the overall composition.

2. The composition according to claim 1 , wherein the proportion of the thermoplastic polyurethane TPU-2 in the composition is in the range from 18% to 55% based on the overall composition.

3. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-1 has a Shore hardness in the range from 85 A to 65 D, determined in accordance with DIN ISO 7619-1.

4. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-1 is based on at least one aliphatic diisocyanate selected from the group consisting of hexamethylene diisocyanate and di(isocyanatocyclohexyl) methane.

5. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-1 has a molecular weight in the range from 100,000 Da to 400,000 Da.

6. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-2 is based on diphenylmethane diisocyanate (MDI).

7. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-2 has a Shore hardness in the range from 80 A to 95 A, determined in accordance with DIN ISO 7619-1.

8. The composition according to claim 1 , wherein the thermoplastic polyurethane TPU-2 has a molecular weight in the range from 50,000 to 150,000 Da.

9. The composition according to claim 1 , wherein the metal hydroxide is selected from the group consisting of aluminum hydroxides, aluminum oxide hydroxides, magnesium hydroxide and a mixture of two or more of these hydroxides.

10. The composition according to claim 1 , wherein the metal hydroxide is aluminum hydroxide.

11. The composition according to claim 1 , wherein the metal hydroxide is at least partly enveloped by a shell.

12. The composition according to claim 1 , wherein the phosphorus-containing flame retardant is selected from the group consisting of derivatives of phosphoric acid, derivatives of phosphonic acid, derivatives of phosphinic acid and a mixture of two or more of these derivatives.

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

14. The composition according to claim 1 , wherein the proportion of the thermoplastic polyurethane TPU-1 in the composition is in the range from 5% to 35% based on the overall composition.

15. The composition according to claim 1 , wherein the proportion of the thermoplastic polyurethane TPU-2 in the composition is in the range from 15% to 65% based on the overall composition.

16. The composition according to claim 1 , wherein the proportion of the metal hydroxide in the composition is in the range from 25% to 65% based on the overall composition.

17. The composition according to claim 1 , wherein the proportion of the phosphorus-containing flame retardant is in the range from 2% to 20% based on the overall composition.

18. A method for production of cable sheaths, comprising applying the composition according to claim 1 to a cable sheath.

Assignees

• Basf Se

Inventors

• Henze Oliver Steffen
• Muehren Oliver
• Rudolph Hans
• Rosenbohm Dirk

Classifications

• C08L75/08

  from polyethers · CPC title

• C08L75/06 Primary

  from polyesters · CPC title

• C08K2003/2227

  of aluminium · CPC title

• C08K5/5333

  Esters of phosphonic acids · CPC title

• C08G18/4854 Primary

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title