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US 5,288,869 AGranted
Pentaerythryl phosphonates and their use in self-extinguishing thermoplastic polymeric compositions
AssigneeEnichem Synthesis S.p.A.
InventorsWilliam Giroldini, Gianluigi Landoni, Antonio Rinaldi, Carlo Neri
Life of this patent
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Abstract
A new group of pentaerythryl diphosphonates and poly(pentaerythryl diphosphonates) are described. Flame-retardant compositions are also described, which include a thermoplastic polymer and a certain amount of self-extinguishing agent consisting of one of the above-mentioned pentaerythryl diphosphonates or poly(pentaerythryl diphosphonates).
Claims5
A pentaerythryl diphosphonate having the formula:
- ##STR8## wherein:
- R.sub.3 and R.sub.4 are the same or different and are linear or branched C.sub.1 -C.sub.6 alkyl, linear or branched amino- or hydroxy-substituted C.sub.2 -C.sub.6 alkyl, a melamine residue, or together with the N to which they are attached form a non-aromatic heterocyclic radical optionally having one or more additional heteroatoms.
A poly(pentaerythryl diphosphonate) having the formula:
- ##STR9## wherein X is ##STR10## R.sub.5 is a linear or branched C.sub.2 -C.sub.6 alkyl, or an aromatic radical,
- R.sub.6 is a linear or branched C.sub.2 -C.sub.6 alkyl, or a C.sub.6 aromatic radical or a melamine radical,
- R.sub.7 and R.sub.8, the same or different, are H, a linear or branched C.sub.1 -C.sub.6 alkyl, or together a C.sub.1 -C.sub.2 alkylene, n is between 2 and 50.
Dependencies are inferred from the claim text.