Flame retardant halogenated polymer compositions
View Patent ↗A halogenated aryl ether oligomer is formed by halogenation of an aryl ether oligomer and is useful as a flame retardant for flammable macromolecular materials. Typically, the halogenated aryl ether oligomer comprises the following repeating monomeric units: wherein R is hydrogen or alkyl, especially C 1 to C 4 alkyl, Hal is halogen, m is at least 1, n is 0 to 3 and x is at least 2.
1. A flame retardant polymer composition comprising
(a) a thermoplastic polymer and
(b) a halogenated aryl ether flame retardant of formula:
wherein
each R 1 is independently selected from hydrogen, halogen and alkyl;
each R 2 is independently selected from hydrogen, halogen and alkyl;
n is 5, m is 4, x is from 2 to 6
provided at least one R 2 and at least one R 1 is halogen,
and wherein the halogen content of the halogenated aryl ether flame retardant is in the range of about 50 to about 83 wt %.
2. The flame retardant polymer composition of claim 1 wherein each R 1 and each R 2 is independently selected from hydrogen and halogen.
3. The flame retardant composition of claim 2 wherein the halogen content of the halogenated aryl ether flame retardant is in the range of about 65 to about 80 wt %.
4. The flame retardant composition of claim 1 wherein the halogen content of the halogenated aryl ether flame retardant is in the range of about 65 to about 80 wt %.
5. The flame retardant polymer composition of claim 2 wherein each R 1 and each R 2 is independently selected from hydrogen and bromine.
6. The flame retardant polymer composition of claim 1 wherein each R 1 and each R 2 is independently selected from hydrogen and bromine.
7. The flame retardant polymer composition of claim 1 wherein the halogenated aryl ether flame retardant comprises more than one compound of formula:
wherein
each R 1 is independently selected from hydrogen, halogen and alkyl;
each R 2 is independently selected from hydrogen, halogen and alkyl;
n is 5, m is 4, x is from 2 to 6
provided at least one R 2 and at least one R 1 is halogen,
and wherein the halogen content of the halogenated aryl ether flame retardant is in the range of about 50 to about 83 wt %.
8. The flame retardant polymer composition of claim 7 wherein the halogenated aryl ether flame retardant comprises a compound wherein x is 3.
9. The flame retardant polymer composition of claim 1 wherein the halogenated aryl ether flame retardant comprises an oligomeric distribution of compounds of formula:
wherein
each R 1 is independently selected from hydrogen, halogen and alkyl;
each R 2 is independently selected from hydrogen, halogen and alkyl;
n is 5, m is 4, x is from 2 to 6
provided at least one R 2 and at least one R 1 is halogen,
and wherein the halogen content of the halogenated aryl ether flame retardant is in the range of about 50 to about 83 wt %.
10. The flame retardant polymer composition of claim 9 wherein the halogenated aryl ether flame retardant comprises an oligomeric distribution containing a compound wherein x is 3.