HALOGEN FREE FLAME RETARDANT THERMOPLASTIC ELASTOMER
A thermoplastic elastomer (TPE) is disclosed which is flame retardant and essentially halogen-free.
1 . A flame retardant polymer composition, comprising:
a) up to about 20 wt. % polypropylene, based on total weight of the composition;
b) a thermoplastic elastomer;
c) an oil; and
d) a flame retardant system;
wherein the flame retardant system comprises ammonium polyphosphate, a phosphinate salt, and a oligomer or polymer of a 1,3,5-triazine derivative.
2 . The flame retardant polymer composition of claim 1 , wherein the oligomer or polymer of a 1,3,5-triazine derivative
includes an aliphatic or an aromatic heterocyclic compound comprising at least one heteroatom covalently bonded to a triazine ring through the heteroatom, and
a linking group selected from a linear or cyclic primary or secondary diamine compound.
3 . The flame retardant polymer composition of claim 1 , wherein the ammonium polyphosphate is crystalline form II.
4 . The flame retardant polymer composition of claim 1 , wherein the phosphinate salt includes
Mg, Ca, Al, Sb, Sn, Ge, Zn, Mo, Ti, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, K, or a protonated nitrogen base.
5 . The flame retardant polymer composition of claim 1 , wherein
the ammonium polyphosphate comprises about 15 to about 28.5 wt. %, based on total weight of the polymer composition;
the phosphinate salt comprises about 4 to about 15 wt. %, based on total weight of the polymer composition; and
the oligomer or polymer of a 1,3,5-triazine derivative comprises about 2.5 to about 15 wt. %, based on total weight of the polymer composition.
6 . The flame retardant polymer composition of claim 1 , wherein the ammonium polyphosphate comprises about 19.5 to about 27 wt. %, based on total weight of the polymer composition; the oligomer or polymer of a 1,3,5-triazine derivative comprises about 5.5 to about 11.5 wt. %, based on total weight of the polymer composition; and the triazine-based copolymer comprises about 4 to about 12.5 wt. %, based on total weight of the polymer composition.
7 . The flame retardant polymer composition of claim 1 , wherein the ammonium polyphosphate comprises about 20.5 to about 25.5 wt. %, based on total weight of the polymer composition; the phosphinate salt comprises about 6 to about 10 wt. %, based on total weight of the polymer composition; and the oligomer or polymer of a 1,3,5-triazine derivative comprises about 6 to about 10 wt. %, based on total weight of the polymer composition.
8 . The flame retardant polymer composition of claim 1 , comprising from about 10 to about 40 wt. % thermoplastic elastomer, based on total weight of the composition.
9 . The flame retardant polymer composition of claim 1 , comprising greater than 0 to about 40 wt. % oil, based on total weight of the composition.
10 . The flame retardant polymer composition of claim 1 , comprising from about 10 to about 70 wt. % flame retardant system, based on total weight of the composition.
11 . The flame retardant polymer composition of claim 1 , wherein the thermoplastic elastomer is selected from the group consisting of styrenic block copolymers, thermoplastic polyolefins, propylene/α-olefin copolymers, ethylene/α-olefin copolymers, copolyesters, thermoplastic polyurethanes, copolyamides, olefin block copolymers, low density polyethylenes, high density polyethylenes, and combinations thereof.
12 . The flame retardant polymer composition of claim 1 , further comprising from about 0 to about 5 wt. % of at least one additive, based on the total weight of the compound, wherein the additive selected from the group consisting of adhesion promoters; biocides; anti-fogging agents; anti-static agents; anti-oxidants; bonding, blowing and foaming agents; dispersants; fillers and extenders; smoke suppressants; impact modifiers; initiators; lubricants; micas; pigments, colorants and dyes; processing aids; release agents; silanes, titanates and zirconates; slip agents, anti-blocking agents; stabilizers; stearates; ultraviolet light absorbers; viscosity regulators; waxes; catalyst deactivators, and combinations of two or more thereof.
13 . A molded article made from the flame retardant polymer composition of claim 1 .
14 . An extruded article made from the flame retardant polymer composition of claim 1 .
15 . A calendared article made from the flame retardant polymer composition of claim 1 .
16 . A thermoformed article made from the flame retardant polymer composition of claim 1 .
17 . A method of using the flame retardant polymer composition of claim 1 , comprising the step of shaping the compound into an article designed to resist combustion or molten dripping in the presence of flame.
18 . The method of claim 17 , wherein the shaping comprises extruding, molding, calendaring, or thermoforming.