Claims
- 1. A flame retardant hardener for epoxy resins comprising the reaction product of an anhydride with a 3-hydroxypropylphosphine oxide having the general formula: ##STR2## wherein R.sub.1 may be the same or a different radical selected from the group consisting of hydrogen, phenyl, hydroxymethyl and alkyl radicals of 1-4 carbon atoms, R.sub.2 may be the same or a different radical selected from the group consisting of hydrogen, hydroxymethyl, and alkyl radicals of 1-4 carbon atoms, R.sub.3 may be the same or a different radical selected from the group consisting of hydrogen and methyl radicals, R.sub.4 is an alkyl radical 2-8 carbon atoms and n is either 0 or 1.
Parent Case Info
This application is a division of application Ser. No. 369,786, filed 4/19/82, now U.S. Pat. No. 4,380,571, issued 4/19/83, which is a division of application Ser. No. 264,256, filed 5/18/81, now U.S. Pat. No. 4,345,059, issued 8/17/82.
US Referenced Citations (12)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2538675 |
Mar 1977 |
DEX |
782445 |
Apr 1978 |
ZAX |
1487609 |
Oct 1977 |
GBX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
369786 |
Apr 1982 |
|
Parent |
264256 |
May 1981 |
|