# US 2013/0158141 A1 · Expanded polyolefin containing powdered activated carbon > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158141 A1 - Document ID: US20130158141A1 - Status: Published application - Kind: A1 - Application number: 13/819,614 - Filed: 2011-08-29 - Published: 2013-06-20 - Earliest claimed: 2010-08-30 - Assignees: Kaneka Belgium N.V. - Inventors: Pierre Van Ravestyn; Nancy Laeveren - Web page: https://patentgrep.com/patent/US20130158141A1 ## CPC - C08J 9/0066: {Use of inorganic compounding ingredients} - C08J 9/18: by impregnating polymer particles with the blowing agent - C08J 9/232: by sintering expandable particles - C08K 3/04: Carbon - C08K 5/0066: {Flame-proofing or flame-retarding additives} - C08K 5/06: Ethers; Acetals; Ketals; Ortho-esters - C08K 5/17: Amines; Quaternary ammonium compounds - C08L 23/02: not modified by chemical after-treatment - C09K 21/10: containing nitrogen - C08J 2201/03: Extrusion of the foamable blend - C08J 2201/032: Impregnation of a formed object with a gas - C08J 2323/02: not modified by chemical after treatment - C08K 5/0083: {Nucleating agents promoting the crystallisation of the polymer matrix} - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - 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) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A pre-expanded polyolefin particle containing powdered activated carbon (PAC) and a pre-expanded polyolefin particle containing PAC and a sterically hindered amine ether flame retardant, as well as processes for preparing pre-expanded polyolefin particles. A process for producing the pre-expanded polyolefin includes providing polyolefin polymer granules containing powdered activated carbon; impregnating the polyolefin polymer granules with a volatile blowing agent in an aqueous suspension at a pressure of 5 to 50 bar and at temperatures of 100 to 170° C.; and decompression to atmospheric pressure. ## Claims ### Claim 1 Pre-expanded polyolefin particle containing powdered activated carbon (PAC). ### Claim 2 (depends on 1) Pre-expanded polyolefin particle according to claim 1, wherein the pre-expanded polyolefin particle has a density of from 10 to 200 g/L. ### Claim 3 (depends on 1) Pre-expanded polyolefin particle according to claim 1, wherein the powdered activated carbon has a median particle size of 1-10 μm. ### Claim 4 (depends on 1) Pre-expanded polyolefin particle according to claim 1, in which the amount of powdered activated carbon (PAC) is between 0.1 to 15% by weight, with respect to 100% by weight of the total components. ### Claim 5 (depends on 1) Pre-expanded polyolefin particle according to claim 1, further comprising a sterically hindered amine ether flame retardant. ### Claim 6 (depends on 5) Pre-expanded polyolefin particle according to claim 5, wherein said sterically hindered amine ether flame retardant is a compound of the formula (1) : R1NHCH2 CH2 CH2NR2 CH2 CH2 NR3 CH2 CH2 CH2NHR4 (1) wherein R1 and R2 are an s-triazine moiety T of the formula (2): in which R5 is an alkyl group having 1 to 12 carbons and R6 is a methyl group, cyclohexyl group or octyl group; and either one of R3 and R4 is the s-triazine moiety T represented by the formula (2) and the other is a hydrogen atom. ### Claim 7 (depends on 5) The pre-expanded polyolefin particle according to claim 5, in which the amount of said flame retardant is from 0.01 to 20% by weight, with respect to 100% by weight of the total components. ### Claim 8 (depends on 1) Pre-expanded polyolefin particle according to claim 1, wherein the polyolefin is selected from polypropylene, polyethylene, or ethylene-propylene copolymers. ### Claim 9 (depends on 1) Process for producing a pre-expanded polyolefin product according to claim 1 comprising the steps of: (a) providing polyolefin polymer granules comprising powdered activated carbon; (b) impregnating said polyolefin polymer granules comprising powdered activated carbon with a volatile blowing agent in an aqueous suspension at a pressure of 5 to 50 bar and at temperatures of 100 to 170° C.; and (c) decompression to atmospheric pressure. ### Claim 10 (depends on 1) Process for producing a pre-expanded polyolefin product according to claim 1 comprising the steps of: (b) providing polyolefin polymer granules comprising a sterically hindered amine ether flame retardant and powdered activated carbon; (c) impregnating said polyolefin polymer granules comprising powdered activated carbon with a volatile blowing agent in an aqueous suspension at a pressure of 5 to 50 bar and at temperatures of 100 to 170° C.; and (d) decompression to atmospheric pressure. ### Claim 11 (depends on 9) Process for producing an expanded polyolefin product comprising the melting of polyolefin granules with powdered activated carbon in an extruder to provide a polyolefin material containing powdered activated carbon, which is converted into granules, followed by the use of the granules thus obtained in the process of claim 9. ### Claim 12 (depends on 10) Process for producing an expanded polyolefin product comprising the melting of polyolefin granules with powdered activated carbon in an extruder to provide a polyolefin material containing powdered activated carbon, which is converted into granules, followed by the use of the granules thus obtained in the process of claim 10. ### Claim 13 (depends on 11) Molded article prepared by in-mold forming of pre-expanded polyolefin particles according to claim 11. ### Claim 14 (depends on 9) Molded article prepared by in-mold forming of pre-expanded polyolefin particles according to claim 9.