# US 2008/0188616 A1 · Method For Production of Bead Polymers With an Average Particle Size in the Range of 1 Micrometer to 40 Micrometers and Moulded Masses and Moulded Bodies Comprising Bead Polymers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0188616 A1 - Document ID: US20080188616A1 - Status: Published application - Kind: A1 - Application number: 11/913,325 - Filed: 2006-03-16 - Published: 2008-08-07 - Earliest claimed: 2005-05-04 - Assignees: Evonik Roehm GmbH - Inventors: Sabine Scharz-Barac; Klaus Schultes; Michael Schnabel; Stefan Nau; Ursula Golchert - Web page: https://patentgrep.com/patent/US20080188616A1 ## CPC - C08F 2/18: Suspension polymerisation - C08F 2/44: Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers - C08F 212/08: Styrene - C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate} - C08F 222/102: {of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate} - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract Process for preparation of bead polymers whose average particle size is in the range from 1 μm to 40 μm, by dispersing and polymerizing a polymerizable composition in an aqueous phase, where the dispersion stabilized by an aluminium compound is prepared at a shear rate ≧103 s−1. A polymerizable composition is used here which, in each case based on its total weight, comprises a) more than 50.0% by weight of at least one compound of the formula (I), where the radicals 1R to 6R have definitions according to the Description, b) from 0.1% by weight to 10.0% by weight of at least one crosslinking agent and c) less than 49.9% by weight of at least one compound of the formula (II) where the radicals R and 7R to 9R have definitions according to the Description The bead polymers prepared according to the inventive process are particularly suitable for production of mouldings with light-scattering properties. ## Claims ### Claim at position 1 1: A process for preparation of bead polymers whose average particle size is in the range from 1 μm to 40 μm, by dispersing and polymerizing a polymerizable composition in an aqueous phase, where the dispersion stabilized by an aluminium compound is prepared at a shear rate ≧103 s−1, in wherein a polymerizable composition is used which, in each case based on its total weight, comprises a) more than 50.0% by weight of at least one compound of the formula (I), where 1R is hydrogen or a linear or branched alkyl group having from 1 to 6 carbon atoms and each of the radicals 2R to 6R is, independently of the others, hydrogen, a linear or branched alkyl group having from 1 to 6 carbon atoms, or a halogen, b) from 0.1% by weight to 10.0% by weight of at least one crosslinking agent and c) less than 49.9% by weight of at least one compound of the formula (II) where R is hydrogen or methyl, 7R is a linear or branched alkyl group or an optionally alkylated cycloalkyl group having from 1 to 40 carbon atoms and the radicals 8R and 9R, in each case independently of each other, are hydrogen or a group of the formula COOR′, where R′ is hydrogen or an alkyl group having from 1 to 40 carbon atoms. ### Claim at position 2 (depends on 1) 2: The process according to claim 1, wherein the polymerizable composition used, in each case based on its total weight, comprises from more than 50.0% by weight to 99.0% by weight of at least one compound of the formula (I), from 0.1% by weight to 5.0% by weight of at least one crosslinking agent and from 0.9% by weight to less than 49.9% by weight of at least one compound of the formula (II). ### Claim at position 3 (depends on 1) 3: The process according to claim 1, wherein the polymerizable composition used, in each case based on its total weight, comprises from 60.0% by weight to 98.5% by weight of at least one compound of the formula (I), from 0.5% by weight to 4.0% by weight of at least one crosslinking agent and from 1.0% by weight to 40.0% by weight of at least one compound of the formula (II). ### Claim at position 4 (depends on 1) 4: The process according to claim 1, wherein the polymerizable composition used, in each case based on its total weight, comprises from 70.0% by weight to 94.3% by weight of at least one compound of the formula (I), from 0.7% by weight to 3.5% by weight of at least one crosslinking agent and from 5.0% by weight to 30.0% by weight of at least one compound of the formula (II). ### Claim at position 5 (depends on 1) 5: The process according to claim 1, wherein the polymerizable composition used, in each case based on its total weight, comprises from 80.0% by weight to 90.0% by weight of at least one compound of the formula (I), from 1.0% by weight to 3.0% by weight of at least one crosslinking agent and from 9.0% by weight to 19.0% by weight of at least one compound of the formula (II). ### Claim at position 6 (depends on 1) 6: The process according to claim 1, wherein Al(OH)3 is used for stabilization. ### Claim at position 7 (depends on 6) 7: The process according to claim 6, wherein the Al(OH)3 is prepared via precipitation. ### Claim at position 8 (depends on 1) 8: The process according to claim 1, wherein the concentration of the aluminium compound, based on the weight of the polymerizable composition, is in the range from 0.5% by weight to 200.0% by weight. ### Claim at position 9 (depends on 1) 9: The process according to claim 1, wherein the concentration of the aluminium compound, based on the weight of the polymerizable composition, is in the range from 3.0% by weight to 100.0% by weight. ### Claim at position 10 (depends on 1) 10: The process according to claim 1, wherein the concentration of the aluminium compound, based on the weight of the polymerizable composition, is in the range from 4.0% by weight to 20.0% by weight. ### Claim at position 11 (depends on 1) 11: The process according to claim 1, wherein the average particle size of the bead polymers is in the range from 5 μm to 35 μm. ### Claim at position 12 (depends on 1) 12: The process according to claim 1, wherein an emulsifier is also used. ### Claim at position 13 (depends on 12) 13: The process according to claim 12, wherein the concentration of the emulsifier, based on the weight of the aluminium compound, is in the range from 0.0% by weight to 5.0% by weight. ### Claim at position 14 (depends on 12) 14: The process according to claim 12, wherein the concentration of the emulsifier, based on the weight of the aluminium compound, is in the range from 0.3% by weight to 3.0% by weight. ### Claim at position 15 (depends on 1) 15: The process according to claim 1, wherein the dispersion obtained after the polymerization reaction is filtered. ### Claim at position 16 (depends on 1) 16: A bead polymer, prepared by the process according to claim 1. ### Claim at position 17 (depends on 16) 17: A moulding composition, comprising at least one bead polymer according to claim 16. ### Claim at position 18 (depends on 16) 18: A moulding with light-scattering properties, comprising at least one bead polymer according to claim 16. ### Claim at position 19 (depends on 18) 19: The moulding according to claim 18, whose transmittance to DIN 5036 is greater than 40.0%. ### Claim at position 20 (depends on 18) 20: The moulding according to claim 18, characterized in that its halved-intensity angle (β) is in the range from 35.0° to less than 90.0°. ### Claim at position 21 (depends on 18) 21: The moulding according to claim 18, wherein its yellowness index to DIN 6167 is smaller than 10.0%.