Flame retardant additives and flame retardant polyester compositions
AssigneeAkzona Incorporated
InventorGerald W. McNeely
Life of this patent
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Abstract
Polyester polymers and copolyester polymers incorporating flame retardant amounts of cyclotri (or tetra) phosphazenes. These cyclotri (or tetra) phosphazenes can be added at the start of ester interchange, prior to, for example polycondensation and conventional melt spinning, or if desired, after polycondensation but before melt spinning. Specific examples of cyclotriphosphazenes and cyclotetraphosphazenes are hexa(dialkylphosphinylmethyleneoxy)cyclotriphosphazene, octa(dialkylphosphinylmethyleneoxy)cyclotetraphosphazene, tris(alkylphosphinyldimethyleneoxy)cyclotriphosphazene, tetra(alkylphosphinyldimethyleneoxy)cyclotetraphosphazene, hexa(dialkylphosphinylmethylene)cyclotriphosphazene, and octa(dialkylphosphinylmethylene)cyclotetraphosphazene.
Claims23
A cyclopolyphosphazene selected from the group of
- (A) A hexa(dialkylphosphinylmethyleneoxy)cyclotriphosphazene corresponding to the formula:
- ##STR20## and (B) An octa(dialkylphosphinylmethyleneoxy)cyclotetraphosphazene corresponding to the formula:
- ##STR21## where R.sub.1 is --CH.sub.2 -- and each R.sub.2 and R.sub.3 is independently a C.sub.1 -C.sub.4 lower alkyl or substituted alkyl group.
A cyclopolyphosphazene selected from the group of
- (A) A tris(alkylphosphinyldimethyleneoxy)cyclotriphosphazene corresponding to the formula:
- ##STR22## and (B) A tetra(alkylphosphinyldimethyleneoxy)cyclotetraphosphazene corresonding to the formula:
- ##STR23## where each R.sub.4 is independently a C.sub.1 -C.sub.4 lower alkyl or substituted alkyl group.
A cyclopolyphosphazene selected from the group of
- (A) A hexa(dialkylphosphinylmethylene)cyclotriphosphazene corresponding to the formula:
- ##STR24## and (B) An octa(dialkylphosphinylmethylene)cyclotetraphosphazene corresponding to the formula:
- ##STR25## where each R.sub.5 independently is --CH.sub.2 --.sub.x where X is 1 to 8 and each of R.sub.6 and R.sub.7 are independently lower alkyl, aryl or cycloalkyl having up to 8 carbon atoms.
A linear polyphosphazene polymer comprising units of the formulas:
- ##STR26## wherein X is independently ##STR27## where R.sub.1 is methylene and each R.sub.2, R.sub.3 and R.sub.4 is independently a C.sub.1 -C.sub.4 lower alkyl or substituted alkyl group;
- each R.sub.5 is independently --CH.sub.2 --.sub.x where x is 1 to 8 and each R.sub.6 and R.sub.7 is independently lower alkyl, aryl or cycloalkyl having up to 8 carbon atoms;
- wherein
- X.sup.1 is selected from the group consisting of X and substituted and unsubstituted alkoxy, aryloxy, mercapto and amino radicals or mixtures thereof;
- and wherein a+b+c is from 20 to about 50,000.
Flame retarded linear polyester containing from about 1 to 20 weight percent of a cyclopolyphosphazene selected from the group consisting of hexa(dimethylphosphinylmethyleneoxy)cyclotriphosphazene and octa(dimethylphosphinylmethyleneoxy)cyclotetraphosphazene.
Dependencies are inferred from the claim text.