Claims
- 1. A flame retardant composition comprising
- (a) a normally flammable composition comprising a polyphenylene ether resin and a styrene resin, and
- (b) an effective, flame-retardant amount of a compound of the formula ##STR6## wherein R is alkyl of from 1 to 18 carbon atoms, aryl or alkaryl.
- 2. A composition as defined in claim 1 wherein said polyphenylene ether resin is of the formula ##STR7## wherein the oxygen ether atom of one unit is connected to the benzene nucleus of the next adjoining unit, n is a positive integer equal to at least 50; and R.sup.1, independently, is a monovalent substituent selected from hydrogen, halogen, hydrocarbon radicals free of a tertiary alpha carbon atom, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus and being free of a tertiary alpha carbon atom, hydrocarbonoxy radicals being free of a tertiary alpha carbon atom, or halohydrocarbonoxy radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus and being free of a tertiary alpha carbon atom.
- 3. A composition as defined in claim 2 wherein each R.sup.1 is alkyl of from 1 to 6 carbon atoms.
- 4. A composition as defined in claim 3 wherein each R.sup.1 is methyl.
- 5. A composition as defined in claim 1 wherein the styrene resin comprises from 20 to 80 parts by weight per 100 parts by weight of component (a).
- 6. A composition as defined in claim 1 wherein said styrene resin has at least 25 percent by weight units derived from a compound of the formula: ##STR8## wherein R.sup.2 is hydrogen, alkyl of from 1 to 6 carbon atoms or halogen; Z is vinyl, halogen, or lower alkyl, and p is 0 or a whole number equal to the number of replaceable hydrogen atoms in the benzene nucleus.
- 7. A composition as defined in claim 6 wherein p is 0 and R.sup.2 is hydrogen.
- 8. A composition as defined in claim 1 wherein, in component (b), R is methyl.
- 9. A composition as defined in claim 1 wherein in component (b), R is decyl.
- 10. A composition as defined in claim 1 wherein the amount of component (b) is from 2 to 10 parts by weight per 100 parts by weight of (a) and (b) combined.
- 11. A composition as defined in claim 1 wherein, in component (b), R is phenyl.
- 12. A flame retardant polyphenylene ether resin/rubber modified, high-impact polystyrene thermoplastic composition comprising an effective flame retarding amount of a pentaerythrityl phosphonate compound represented by the formula ##STR9## wherein R is methyl, phenyl, or benzyl.
- 13. The composition of claim 12 wherein said molding composition comprises a homogeneous blend of 20 to 80 percent polyphenylene ether resin and 20 to 80 percent of rubber-modified, high-impact polystyrene resin.
- 14. The composition of claim 12 wherein each R is methyl.
- 15. The composition of claim 12 wherein each R is phenyl.
- 16. The composition of claim 12 wherein each R is benzyl.
- 17. The composition of claim 12 wherein the phosphonate is present in at least about 5% by weight of the composition.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of Ser. No. 831,056, filed Sept. 6, 1977 now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4390477 |
Axelrod |
Jun 1983 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
831056 |
Sep 1977 |
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