HALOGEN-FREE, FLAME-RETARDANT POLYURETHANE FOAMS WITH LOW SCORCH LEVEL

• US 20100041780A1
• Filed: 08/10/2009
• Published: 02/18/2010
• Est. Priority Date: 08/16/2008
• Status: Abandoned Application

• Current Assignee: Lanxess Deutschland GmbH (Lanxess AG)
• Original Assignee: Lanxess Deutschland GmbH (Lanxess AG)
• Inventors: HANSEL, JAN-GERD, FRIEDRICH, ANNE, TEBBE, HEIKO
• Application Number:
  US12/538,257
• Publication Number:
  US 20100041780A1
• Time in Patent Office: Days
• US Class Current: 521/107
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/302 Water
• CPC Class Codes: C08G 18/4829 Polyethers containing at least three hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/7621 being toluene diisocyanate including isomer mixtures
• CPC Class Codes: C08G 2110/0008 flexible
• CPC Class Codes: C08G 2110/0083 prepared using water as the sole blowing agent
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 9/0038 containing phosphorus
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08K 5/0066 Flame-proofing or flame-retarding additives
• CPC Class Codes: C08K 5/523 with hydroxyaryl compounds
• CPC Class Codes: C08L 75/04 Polyurethanes

Abstract

The present invention relates to halogen-free flame-retardant polyurethane foams with low scorch level which comprise, as flame retardant, a mixture composed of at least one polyaryl phosphate and of at least one monoaryl phosphate, and also to a method for the production of these foams, and to their use.

Claims

1. A flame-retardant polyurethane foam comprising, as flame retardant, a mixture composed of

a) at least one halogen-free polyaryl phosphate of the general formula (I)

and

b) at least one halogen-free monoaryl phosphate of the general formula (II)

in which

R¹, R², R¹, R⁵, R⁶ and R⁷ are in each case, independently of each other, H or a straight-chain, branched or cyclic C₁-C₄-alkyl moiety or phenyl,

R⁴ is H or a straight-chain, branched or cyclic C₁-C₁₀-hydrocarbon moiety and

n is a number from 1 to 20.

2. A flame-retardant polyurethane foam according to claim 1, wherein R¹, R², R³, R⁵, R⁶ and R⁷, independently of each other, are H or methyl.

3. A flame-retardant polyurethane foam according to claim 1, wherein R⁴ is H, methyl or phenyl.

4. A flame-retardant polyurethane foam according to claim 1, comprising from 0.1 to 20% by weight of polyaryl phosphates of the formula (I) and from 0.1 to 20% by weight of monoaryl phosphates of the formula (II).

5. A flame-retardant polyurethane foam according to claim 1, comprising from 0.5 to 16% by weight of polyaryl phosphates of the formula (I) and from 0.5 to 16% by weight of monoaryl phosphates of the formula (II).

6. A flame-retardant polyurethane foam according to claim 1, wherein the mixture composed of polyaryl phosphate and monoaryl phosphate is a liquid in the temperature range from 20°

C. to 80°

C.

7. A flame-retardant polyurethane foam according to claim 6, wherein the viscosity of the mixture composed of polyaryl phosphate and monoaryl phosphate at 20°

C. is from 10 mPas to 5000 mPas.

8. A flame-retardant polyurethane foam according to claim 1, wherein these are flexible foams.

9. A flame-retardant polyurethane foam according to claim 1, comprising further flame retardants.

11. A method of using the polyurethane foams according to claim 1 in furniture padding, textile inserts, mattresses, seats, armrests, modules, and also seat coverings and cladding over technical equipment.

10. A method for the production of flame-retardant polyurethane foams via reaction of organic polyisocyanates with compounds having at least two hydrogen atoms reactive towards isocyanates, and optionally with blowing agents, stabilizers, activators or further auxiliaries and additives, at from 20 to 80°

C., wherein, a mixture of

a) from 0.1 to 40 parts, based on 100 parts of polyol component, of at least one halogen-free polyaryl phosphate of the general formula (I)

and

b) from 0.1 to 40 parts, based on 100 parts of polyol component, of at least one halogen-free monoaryl phosphate of the general formula (II)

in which

R¹, R², R³, R⁵, R⁶ and R⁷ are in each case, independently of each other, H or a straight-chain, branched or cyclic C₁-C₄-alkyl moiety or phenyl,

R⁴ is H or a straight-chain, branched or cyclic C₁-C₁₀-hydrocarbon moiety and

n is a number from 1 to 20 is used.

12. A method of using a mixture composed of

a) at least one halogen-free polyaryl phosphate of the general formula (I)

and

b) at least one halogen-free monoaryl phosphate of the general formula (II)

in which

R¹, R², R³, R⁵, R⁶ and R⁷ are in each case, independently of each other, H or a straight-chain, branched or cyclic C₁-C₄-alkyl moiety or phenyl,

R⁴ is H or a straight-chain, branched or cyclic C₁-C₁₀-hydrocarbon moiety and

n is a number from 1 to 20,

for avoidance of scorch and of fogging in and, respectively, from halogen-free, flame-retardant polyurethane foams.

13. A method for the avoidance of fogging and/or scorch from and, respectively, in flame-retardant polyurethane foams, characterized in that, as flame retardant, a mixture composed of

a) at least one halogen-free polyaryl phosphate of the general formula (I)

and

b) at least one halogen-free monoaryl phosphate of the general formula (II)

in which

R¹, R², R³, R⁵, R⁶ and R⁷ are in each case, independently of each other, H or a straight-chain, branched or cyclic C₁-C₄-alkyl moiety or phenyl,

R⁴ is H or a straight-chain, branched or cyclic C₁-C₁₀-hydrocarbon moiety and

n is a number from 1 to 20 is used.