Claims
- 1. A flame-retardant composition comprising an epoxide resin and a compound of the formula ##EQU1## wherein Z is methylene, methylene substituted with alkyl groups of 1 to 6 carbon atoms, cyclohexylidene, or cyclopentylidene; A is alkylene of 1 to 12 carbon atoms, or -CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 -; R.sub.1 and R.sub.2 each is alkyl or alkenyl of 1 to 4 carbon atoms, or R.sub.1 and R.sub.2 together is alkylene of 2 to 5 carbon atoms, wherein said compound is present in the composition in such an amount that the phosphorus content is at least 0.8 to 4%.
- 2. The flame-retardant composition according to claim 1 wherein Z is propylidene-(2,2).
- 3. The flame-retardant composition according to claim 1 wherein R.sub.1 and R.sub.2 each is alkyl or alkenyl of 1 to 4 carbon atoms.
- 4. The flame-retardant composition according to claim 1 wherein R.sub.1 and R.sub.2 is each ethyl or methyl.
- 5. The flame-retardant composition according to claim 1 wherein A is alkylene of 2 to 6 carbon atoms.
- 6. The flame-retardant composition according to claim 1 wherein A is ethylene.
- 7. The flame-retardant composition according to claim 1 wherein A is -CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 -.
Priority Claims (1)
Number |
Date |
Country |
Kind |
18031/72 |
Dec 1972 |
CH |
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Parent Case Info
This is a division of application Ser. No. 423,363 filed on Dec. 7, 1973, now U.S. Pat. No. 3,920,685.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3890275 |
Golborn et al. |
Jun 1975 |
|
3892765 |
Porret et al. |
Jul 1975 |
|
3925406 |
Porret et al. |
Dec 1975 |
|
3946034 |
Porret et al. |
Mar 1976 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
423363 |
Dec 1973 |
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