Phosphinate as flame-proofing additive for PUR/PIR hard foam material

Patent metadata

Field	Value
Publication number	US-11279809-B2
Application number	US-201917264432-A
Country	US
Kind code	B2
Filing date	Aug 2, 2019
Priority date	Aug 8, 2018
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

The invention relates to flame-proofed polyurethane hard foam material or polyurethane/polyisocyanurate hard foam material (designated below individually or jointly also as “PUR/PIR hard foam material”) comprising phosphinates (also hypophosphite), and to a method for producing PUR/PIR hard foam materials through the implementation of a reaction mixture containing A1 an isocyanate-reactive component, A2 propellant, A3 catalyst, A4 optionally additive, A5 flame-proofing agent, B an isocyanate component, characterised in that the flame-proofing agent A5 contains a phosphine according to the formula (I)M[(R)2PO2]n, where R=in each case stands for H, C1- to C4-(hydroxy-)alkyl group or benzyl group, M=an element of the main groups 1 to 3, wherein hydrogen is excepted, and n=the number of the main group of M, and the proportion of the phosphine according to the formula (I) is 0.1 to 15 wt %, based on the total mass of components A1 to A5.

First claim

The invention claimed is:

1. A process for producing rigid PUR/PIR foams, comprising reacting a reaction mixture comprising:
A1 an isocyanate-reactive component;
A2 blowing agent;
A3 catalyst;
A4 optionally additive;
A5 flame retardant; and
B an isocyanate component,
wherein the flame retardant A5 comprises a phosphinate of formula (I)
M[(R) 2 PO 2 ] n   (I),

wherein
each R independently represents C1- to C4-(hydroxy)alkyl or benzyl,
M is an element from main groups 1 to 3, with the exception of hydrogen, and
n is the number of the main group of M,
and

wherein the phosphinate of formula (I) is present in an amount of 0.1% to 15% by weight, based on the total mass of components A1 to A5 and in an amount of 5.0% to 40.0% by weight, based on the total weight of flame retardant A5.

2. The process as claimed in claim 1 , wherein the isocyanate-reactive component A1 comprises a polyester polyol.

3. The process as claimed in claim 1 , wherein the isocyanate-reactive component A1 comprises a polyester polyol having an equivalent weight of 50 g/mol to 2000 g/mol.

4. The process as claimed in claim 1 , wherein the phosphinate of formula (I) is present in an amount of 10.0% by weight to 30.0% by weight, based on the total mass of the flame retardant A5.

5. The process as claimed in claim 1 , wherein the phosphinate of formula (I) is present in an amount of 0.5% by weight to 15.0% by weight, based on the total mass of the components A1 to A5.

6. The process as claimed in claim 1 , wherein the flame retardant A5 contains no halogen-containing flame retardant.

7. The process as claimed in claim 1 , wherein M is an element from main group 1 or 2.

8. The process as claimed in claim 1 , wherein M is selected from sodium, potassium, magnesium, calcium and aluminum.

9. The process as claimed in claim 1 , wherein the flame retardant A5 further comprises diphenylcresyl phosphate, triethyl phosphate, bisphenol A bis(diphenylphosphate) or a mixture thereof.

10. The process as claimed in claim 1 , wherein at least one R is hydrogen or C1-C4-alkyl.

11. The process as claimed in claim 1 , wherein the phosphinate of formula (I) has a particle diameter d 50 of less than 50.0 μm.

12. The process as claimed in claim 1 , wherein the isocyanate component B comprises MDI, polymeric MDI, TDI, or a mixture thereof.

13. A rigid PUR/PIR foam obtained by the process as claimed in claim 1 .

14. An insulation material comprising the rigid PUR/PIR foams as claimed in claim 13 .

15. A reaction mixture for producing rigid PUR/PIR foams, comprising:
A1 an isocyanate-reactive component
A2 blowing agent
A3 catalyst
A4 optionally additive
A5 flame retardant,
wherein the flame retardant A5 comprises a phosphinate of formula (I)
M[(R) 2 PO 2 ] n   (I),

wherein
each R independently represents C1- to C4-(hydroxy)alkyl or benzyl,
M is an element from main groups 1 to 3, with the exception of hydrogen, and
n is the number of the main group of M,
and
wherein the phosphinate of formula (I) is present in an amount of 0.1% to 15% by weight based on the total mass of components A1 to A5 and in an amount of 5.0% to 40.0% by weight, based on the total weight of flame retardant A5.

16. The reaction mixture of claim 15 , wherein the phosphinate of formula (I) is present in an amount of 10.0% to 30.0% by weight, based on the total weight of flame retardant A5.

Assignees

• Covestro Intellectual Property Gmbh & Co Kg

Inventors

• Albach Rolf
• Hagen Torsten
• Heinemann Torsten
• Welsch Nicole

Classifications

• C08G18/7664 Primary

  containing alkylene polyphenyl groups · CPC title

• C09K21/12

  containing phosphorus · CPC title

• C08K3/32

  Phosphorus-containing compounds · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08J2205/10

  Rigid foams · CPC title