Oligomeric, hydroxy-terminated phosphonates
Epoxy resins that are suitable for forming epoxy laminates that meet a UL-94 rating of V-0 comprise a hydroxy-terminated oligomeric phosphonate comprising the repeating structure —OP(═O)(R)OArylene-, where R is alkyl, as a flame retardant.
1. A thermoset resin composition comprising an oligomeric hydroxy-terminated phosphonate comprising the repeating structure —OP(═O)(R) OArylene-, where R is alkyl, optionally in the presence of another flame retardant.
2. A composition as claimed in claim 1 wherein the content of oligomeric hydroxy-terminated phosphonate ranges from about 20% to about 100%, based upon the total number of termination ends that potentially could hold such end groups, preferably from about 50% to about 100%.
3. A composition as claimed in claim 1 wherein Arylene is 1,3-phenylene.
4. A composition as claimed in claim 1 wherein R is lower alkyl.
5. A composition as claimed in claim 1 wherein Arylene is 1,3 phenylene and R is lower alkyl.
6. A composition as claimed in claim 1 wherein Arylene is 1,3-phenylene and R is methyl.
7. A composition as claimed in claim 1 wherein Arylene is a bisphenol diradical unit.
8. A composition as claimed in claim 1 wherein Arylene is a bisphenol diradical unit and R is methyl.
9. A composition as claimed in any of claims 1 – 8 wherein the thermoset resin is an epoxy resin, optionally wherein the oligomeric hydroxy-terminated phosphonate and the epoxy have been prereacted with one another.
10. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 1 .
11. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 2 .
12. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 3 .
13. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 4 .
14. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 5 .
15. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 6 .
16. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 7 .
17. An epoxy laminate meeting a flame retardant UL-94 rating of V-0 and resistant to delamination which comprises a flame retarding amount of the oligomeric hydroxy-terminated phosphonate as claimed in claim 8 .