# US 2014/0155527 A1 · Flame retardant polyolefin composition for shipping pallets > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155527 A1 - Document ID: US20140155527A1 - Status: Published application - Kind: A1 - Application number: 13/916,031 - Filed: 2013-06-12 - Published: 2014-06-05 - Earliest claimed: 2012-06-18 - Assignees: ICL-IP America Inc. - Applicants: ICL-IP America Inc. - Inventors: Sergei V. Levchik; Gerald R. Alessio; Yankai Yang - Web page: https://patentgrep.com/patent/US20140155527A1 ## CPC - C08K 3/22: of metals - C08K 3/26: Carbonates; Bicarbonates - C08K 5/5317: Phosphonic compounds, e.g. R—P(:O)(OR')2 - C08L 23/10: Homopolymers or copolymers of propene - C08L 2201/02: Flame or fire retardant/resistant - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract There is provided herein a flame retarded polyolefin composition comprising a thermoplastic polyolefin polymer, an inorganic flame retardant and a synergist comprising a metal phosphonate represented by the formula: There is also provided a method for making a flame retarded polyolefin composition comprising contacting at least one thermoplastic polyolefin polymer with at least one inorganic flame retardant and at least one metal phosphonate and heating the mixture of thermoplastic polyolefin polymer, at least one inorganic flame retardant and at least one metal phosphonate above the melting temperature of the thermoplastic polyolefin polymer. ## Claims ### Claim 1 A flame retarded polyolefin composition comprising a thermoplastic polyolefin polymer, an inorganic flame retardant and a synergist comprising a metal phosphonate represented by the general formula (I): where Me is a metal, n is equal to the valency of the metal and is in the range of from 1 to 4, R1 is a linear or branched alkyl of up to about 12 carbon atoms, R2 is a linear or branched alkyl of up to about 12 carbon atoms, or a substituted aryl or an unsubstituted aryl of the general formula (II): where R3 is hydrogen, or a branched or linear alkyl of up to about 4 carbon atoms, or NH2 or CN or NO2, wherein the inorganic flame retardant is present in an amount of from about 5 weight percent to about 40 weight percent. ### Claim 2 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the thermoplastic polyolefin polymer is at least one of a polyethylene homopolymer, polyethylene copolymer, polypropylene homopolymer and polypropylene copolymer. ### Claim 3 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the thermoplastic polyolefin polymer is at least one low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), linear very low-density polyethylene (VLDPE), high-density polyethylene (HDPE), ethylene-methyl methacrylate (EMMA) copolymer, ethylene methyl acrylate (EMA) copolymer, ethylene ethyl acrylate (EEA) copolymer, ethylene butyl acrylate (EBA) copolymer, ethylene vinyl acetate (EVA) copolymer, ethylene glycidyl methacrylate copolymer, ethylene-butene-1 copolymer, ethylene-butene-hexene terpolymer, ethylene propylene diene terpolymer (EPDM), ethylene-octene copolymer (EOR), ethylene copolymerized polypropylene (random PP or block PP), ethylene propylene (EPR) copolymer, poly-4-methyl-pentene-1, maleic anhydride grafted low-density polyethylene, hydrogenated styrene-butadiene (H-SBR) copolymer, maleic anhydride grafted linear low-density polyethylene, maleic anhydride grafted linear very low-density polyethylene, copolymers of ethylene and α-olefin with a carbon number of 4 to 20, ethylene-styrene copolymer, maleic anhydride grafted ethylene-styrene copolymer, maleic anhydride grafted ethylene-methyl acrylate copolymer, maleic anhydride grafted ethylene-vinyl acetate copolymer, ethylene-maleic anhydride copolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer, and ethylene-propylene-butene-1 terpolymer including butene-1, and mixtures thereof. ### Claim 4 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the inorganic flame retardant is a metal hydroxide selected from the group consisting of aluminum hydroxide, magnesium hydroxide, magnesium basic carbonate, hydrotalcite, calcium aluminate hydrate and combinations thereof. ### Claim 5 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein Me is selected from the group consisting of Ca, Mg, Zn, Al, Fe, Ni, Cr, and Ti. ### Claim 6 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the metal phosphonate is aluminum methyl methylphosphonate. ### Claim 7 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein an inorganic flame retardant is present in an amount of from about 10 weight percent to about 25 weight percent based on the total weight of the flame retarded polyolefin composition. ### Claim 8 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein an inorganic flame retardant is present in an amount of from about 5 weight percent to less than 20 weight percent based on the total weight of the flame retarded polyolefin composition. ### Claim 9 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the metal phosphonate is present in an amount of from about 0.5 weight percent to about 25 weight percent of the total weight of the flame retarded polyolefin composition. ### Claim 10 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the metal phosphonate is present in an amount from about 0.5 weight percent to about 10 weight percent of the total weight of the flame retarded polyolefin composition. ### Claim 11 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the metal phosphonate is present in an amount from about 0.5 weight percent to about 5 weight percent of the total weight of the flame retarded polyolefin composition. ### Claim 12 (depends on 1) The flame retarded polyolefin composition of claim 1 wherein the metal phosphonate is present in an amount from about 0.5 weight percent to less than 3 weight percent of the total weight of the flame retarded polyolefin composition. ### Claim 13 A master batch comprising an inorganic flame retardant, a metal phosphonate and a polyolefin polymer carrier comprising a thermoplastic polyolefin polymer. ### Claim 14 (depends on 1) A flame retarded shipping pallet comprising the flame retarded polyolefin composition of claim 1. ### Claim 15 A method of making a flame retarded polyolefin composition comprising: contacting at least one thermoplastic polyolefin polymer with at least one inorganic flame retardant and at least one metal phosphonate; and, heating the mixture of thermoplastic polyolefin polymer, at least one inorganic flame retardant and at least one metal phosphonate to above the melting temperature of the thermoplastic polyolefin polymer, wherein the inorganic flame retardant is present in an amount of from about 5 weight percent to about 40 weight percent.