Flame-retardant thermoplastic polyurethane

Patent metadata

Field	Value
Publication number	US-10501603-B2
Application number	US-201515122080-A
Country	US
Kind code	B2
Filing date	Feb 16, 2015
Priority date	Feb 26, 2014
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

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

First claim

The invention claimed is:

1. A composition, comprising:
at least one thermoplastic polyurethane;
at least one melamine cyanurate;
at least one first phosphorus-containing flame retardant (F1) selected from the group consisting of a phosphoric acid compound, a phosphonic acid compound, and derivatives thereof;
at least one further phosphorus-containing flame retardant (F2) comprising a phosphinic acid compound or derivative thereof,
wherein:
the phosphorus-containing flame retardant (F1) comprises a phosphoric ester;
the phosphorus-containing flame retardant (F2) comprises a phosphinate; and
a proportion of the melamine cyanurate in the composition is from 25% to 40% by weight based on the overall composition.

2. The composition according to claim 1 , wherein the phosphinate is selected from the group consisting of an aluminum phosphinate and a zinc phosphinate.

3. The composition according to claim 1 , wherein the flame retardant (F1) is selected from the group consisting of resorcinol bis(diphenyl phosphate) (RDP), bisphenol A bis(diphenyl phosphate) (BDP) and diphenyl cresyl phosphate (DPK).

4. The composition according to claim 1 , wherein the melamine cyanurate has a particle size in the range from 0.1 to 100 μm.

5. The composition according to claim 1 , wherein:
the phosphinate is selected from the group consisting of an aluminum phosphinate and a zinc phosphinate;
the flame retardant (F1) is selected from the group consisting of resorcinol bis(diphenyl phosphate) (RDP), bisphenol A bis(diphenyl phosphate) (BDP) and diphenyl cresyl phosphate (DPK); and
the melamine cyanurate has a particle size in the range from 0.1 to 100 μm.

6. 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 diisocyanate and at least one polycarbonatediol, and a thermoplastic polyurethane based on at least one diisocyanate and polytetrahydrofuran polyol.

7. The composition according to claim 1 , wherein the thermoplastic polyurethane has a mean molecular weight (M w ) in the range from 50,000 to 500,000 Da.

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

9. The composition according to claim 1 , wherein the thermoplastic polyurethane has a Shore hardness in the range from 80 A to 100 A, determined in accordance with DIN 53505.

10. The composition according to claim 1 , wherein a proportion of the thermoplastic polyurethane in the composition is from 30% to 75% by weight based on the overall composition.

11. The composition according to claim 1 , wherein a proportion of the melamine cyanurate in the composition is from 25% to 35% by weight based on the overall composition.

12. The composition according to claim 1 , wherein a proportion of the flame retardant (F2) in the composition is from 3% to 15% by weight based on the overall composition.

13. The composition according to claim 1 , wherein a proportion of the flame retardant (F1) is from 2% to 15% by weight based on the overall composition.

14. A method of making a cable sheath, the method comprising:
passing a core comprising at least one wire through an extruder device; and
coating the core with a composition according to claim 1 during said passing.

Assignees

• Basf Se

Inventors

• Henze Oliver Steffen
• Muehren Oliver
• Rudolph Hans
• Moeller Sabine
• Lehmann Aleksandra

Classifications

• B29K2995/0016

  Non-flammable or resistant to heat · CPC title

• B29L2031/707

  Cables, i.e. two or more filaments combined together, e.g. ropes, cords, strings, yarns (filamentary material B29L2031/731, electric cables B29L2031/3462, optical cables B29L2011/0075) · CPC title

• B29K2105/20

  Inserts · CPC title

• H01B3/302

  Polyurethanes or polythiourethanes; Polyurea or polythiourea · CPC title

• C08K5/34924

  containing cyanurate groups; Tautomers thereof · CPC title