# US 10,501,603 B2 · Flame-retardant thermoplastic polyurethane

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- Number: US 10,501,603 B2
- Document ID: US10501603B2
- Status: Granted
- Kind: B2
- Application number: 15/122,080
- Filed: 2015-02-16
- Published: 2017-03-09
- Granted: 2019-12-10
- Earliest claimed: 2014-02-26
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Oliver Steffen Henze; Oliver Muehren; Hans Rudolph; Sabine Moeller; Aleksandra Lehmann
- Web page: https://patentgrep.com/patent/US10501603B2

## CPC

- C08K 5/5313: Phosphinic compounds, e.g. R2=P(:O)OR'
- B29C 48/022: {characterised by the choice of material}
- B29C 48/154: Coating solid articles, i.e. non-hollow articles
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 5/34924: {containing cyanurate groups; Tautomers thereof}
- C08K 5/521: Esters of phosphoric acids, e.g. of H3PO4
- C08K 5/523: with hydroxyaryl compounds
- H01B 3/302: {Polyurethanes or polythiourethanes; Polyurea or polythiourea}
- H01B 7/295: using material resistant to flame
- B29K 2075/00: Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material
- B29K 2105/20: Inserts
- B29K 2995/0016: Non-flammable or resistant to heat
- B29L 2031/707: {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)}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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).

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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.

### Claim 12 (depends on 1)

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.

### Claim 13 (depends on 1)

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.

### Claim 14 (depends on 1)

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.