Polyalkylene glycol alkyl or haloalkyl polyphosphonates used as flame retardants in polyurethane foam
AssigneeStauffer Chemical Company
InventorKyung S. Shim
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Abstract
Polyalkylene glycol alkyl or haloalkyl polyphosphonates having the idealized formula: ##EQU1## WHEREIN R is a polyalkylene glycol residue, R' is alkyl or haloalkyl and n is 1-100, are prepared by transesterifying a tertiary phosphite with a polyalkylene glycol and rearranging the resultant polyalkylene glycol alkyl or haloalkyl polyphosphite to a polyalkylene glycol alkyl or haloalkyl phosphonate by the action of heat and an Arbuzov rearrangement catalyst.
Claims9
A flame retardant polyurethane foam containing as a chemically bonded integral part thereof, the residue of a polyalkylene glycol alkyl or haloalkyl polyphosphonate characterized by an acid number in water of below about 15 mg. of KOH per gram of sample, having the formula:
- ##EQU6## wherein R is the residue of a polyalkylene glycol having the formula:
- HO --R"O ).sub.x H
- wherein R" is an alkylene radical of 2 to about 20 carbon atoms and x is a number from 2 to about 20, R' is alkyl or haloalkyl and n is a number in the range from about 2 to about 50.
A flame retardant polyurethane foam containing as a chemically bonded integral part thereof, the residue of a polyalkylene glycol alkyl or haloalkyl polyphosphonate resulting from a process of heating a polyalkylene glycol alkyl or haloalkyl polyphosphite of the formula:
- ##EQU7## wherein R is the residue of a polyalkylene glycol having the formula:
- HO --R"O ).sub.x H
- wherein R" is an alkylene radical of 2 to about 20 carbon atoms and x is a number from 2 to about 20, R' is alkyl or haloalkyl and n is a number in the range from 2 to about 50, in the presence of a catalytically effective amount of an Arbusov rearrangement catalyst at a temperature in the range of from about 160.degree. C. to about 230.degree. C.
Dependencies are inferred from the claim text.