Flame retardant, pressure-sensitive adhesive, and curable composition
Flame retardant tackifiers are represented by the formula ′ wherein R represents a hydrocarbyl group having 20 carbons and three consecutive fused six-membered rings; and each R 2 independently represents an alkyl group having from 1 to 8 carbon atoms. Curable compositions contain a curable binder precursor and at least one of the flame resistant tackifiers. Pressure-sensitive adhesives comprises an elastomer and at least one flame retardant tackifier compound represented by the formula ″ wherein R represents a hydrocarbyl group having 20 carbon atoms and three consecutive fused six-membered rings and each R 1 independently represents an alkyl or aryl group having from 1 to 8 carbon atoms.
1. A pressure-sensitive adhesive composition comprising:
an elastomer; and
at least one flame retardant tackifier compound represented by the formula
wherein
R represents a hydrocarbyl group having 20 carbon atoms and three consecutive fused six-membered rings; and
each R 1 independently represents an alkyl or aryl group having from 1 to 8 carbon atoms.
2. The pressure-sensitive adhesive composition of claim 1 , wherein the at least one flame retardant tackifier compound comprises at least one compound represented by the formula
3. The pressure-sensitive adhesive composition of claim 1 , wherein the elastomer has a glass transition temperature of less than or equal to zero degrees Celsius.
4. The pressure-sensitive adhesive composition of claim 1 , wherein said at least one elastomer is selected from the group consisting of natural rubber elastomers, acrylic elastomers, styrene-diene block copolymer elastomers, polybutadiene elastomers, α-olefin elastomers, polyisobutylene elastomers, and combinations thereof.
5. The pressure-sensitive adhesive composition of claim 1 , wherein each R 1 is independently selected from the group consisting of phenyl groups and alkyl groups having from 1 to 6 carbon atoms.
6. The pressure-sensitive adhesive composition of claim 1 , wherein each R 1 independently represents an alkyl group having from 1 to 4 carbon atoms.
7. The pressure-sensitive adhesive composition of claim 1 , wherein each R 1 independently represents methyl, ethyl, or propyl.
8. The pressure-sensitive adhesive composition of claim 1 , wherein the total combined amount of:
the at least one flame retardant tackifier;
any additional tackifier, if present; and
any additional flame retardant, if present,
is less than or equal to 25 percent by weight, based on the total weight of the pressure-sensitive adhesive composition.
9. The pressure-sensitive adhesive composition of claim 1 , wherein the pressure-sensitive adhesive composition is substantially free of additional tackifier.
10. The pressure-sensitive adhesive composition claim 1 , wherein the pressure-sensitive adhesive composition is substantially free of additional flame retardant.
11. A curable composition comprising:
a curable binder precursor; and
a flame retardant tackifier represented by the formula
wherein
R represents a hydrocarbyl group having 20 carbon atoms and three consecutive fused six-membered rings; and
each R 2 independently represents an alkyl group having from 1 to 8 carbon atoms.
12. The curable composition of claim 11 , wherein the at least one flame retardant tackifier comprises at least one compound represented by the formula
13. The curable composition of claim 11 , wherein the curable binder precursor is selected from the group consisting of curable epoxy resins and curable acrylic resins.
14. The curable composition of claim 11 , wherein each R 2 independently represents an alkyl group having from 1 to 6 carbon atoms.
15. The curable composition of claim 11 , wherein each R 2 independently represents an alkyl group having from 1 to 4 carbon atoms.
16. The curable composition of claim 11 , wherein each R 2 independently represents methyl, ethyl, or propyl.