Fire-retardant polyurethane foams
AssigneeMcDonnell Douglas Corporation
InventorsMartin B. Sheratte, Lydia H. Simanyi
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Abstract
Production of urethane foams of increased fire resistance by mixing an ethylenic, e.g. allyl or vinyl, phosphorus compound with a polyol and polymerizing the polyol with polyisocyanate while simultaneously polymerizing the ethylenic phosphorus compound with a suitable catalyst to form an interpenetrating network of urethane polymer and phosphorus-containing polymer.
Claims20
A fire resistant polyurethane foam composition comprising an interpenetrating network of polyether based urethane polymer and phosphorus-containing polymer, the phosphorus being present as a pendant group on said last mentioned polymer, said phosphorus-containing polymer being derived from a monomer selected from the group consisting of:
- ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each selected from the group consisting of H, alkyl of from about 1 to about 20 carbon atoms, aryl of from 6 to about 24 carbon atoms, and halogen;
- and X is vinyl or allyl.
A process for preparing a fire resistant polyether based polyurethane foam composition which comprises mixing a polyol and a polyisocyanate, with a phosphorus-containing ethylenic monomer, said monomer being inert toward said polyol and said polyisocyanate, said monomer selected from the group consisting of:
- ##STR3## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each selected from the group consisting of H, alkyl of from about 1 to about 20 carbon atoms, aryl of from 6 to about 24 carbon atoms, and halogen;
- and X is vinyl or allyl, and simultaneously but separately polymerizing said polyol and said polyisocyanate to form polyurethane, and said phosphorus-containing ethylenic monomer to form a polymer thereof, said last mentioned polymer and said polyurethane forming an interpenetrating network of the two polymers, said phosphorus atom being present as a pendant group on the polymer derived from said ethylenic monomer.
Dependencies are inferred from the claim text.