Halogen-free, flame-retardant rigid polyurethane foam and a process for its production
AssigneeClariant GmbH
InventorsAnne Witte, Wilfried Krieger
Life of this patent
Estimating the term…
Abstract
The invention relates to a halogen-free, flame-retardant rigid polyurethane foam, wherein a combination of oxalkylated alkylphosphonic acids and ammonium polyphosphate is present as flame retardant, and to a process for its production. The invention also relates to the use of oxalkylated alkylphosphonic acids in a mixture with ammonium polyphosphate for producing halogen-free, flame-retardant rigid polyurethane foams of this type.
Claims11
A halogen-free, flame-retardant rigid polyurethane foam, wherein a combination of oxalkylated alkylphosphonic acids and ammonium polyphosphate is present as flame retardant, and wherein the oxalkylated alkylphosphonic acids have the formula I
- where
- R1 is a methyl, ethyl or propyl radical,
- R2 and R3 are identical or different and are a methyl, ethyl or propyl radical and
- x is a number from 1.2 to 1.9.
A process for producing a halogen-free, flame-retardant rigid polyurethane foam comprising the steps of reacting organic polyisocyanates with compounds having at least 2 hydrogen atoms capable of reaction with isocyanates, in the presence of blowing agents, stabilizers, and a flame-retardant combination of ammonium polyphosphate and oxalkylated alkylphosphonic acids of the formula I:
- where
- R1 is a methyl, ethyl or propyl radical,
- R2 and R3 are identical or different and are a methyl, ethyl or propyl radical and
- x is a number from 1.2 to 1.9.
Dependencies are inferred from the claim text.