# US 4,391,920 A · Porose, pulverformige polymerteilchen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,391,920 A - Document ID: US4391920A - Status: Granted - Kind: A - Application number: 06/283,675 - Filed: 1981-07-15 - Granted: 1983-07-05 - Earliest claimed: 1980-07-15 - Assignees: Akzo N.V. - Inventors: Wolfgang Lange - Web page: https://patentgrep.com/patent/US4391920A ## CPC - C09K 17/00: Soil-conditioning materials or soil-stabilising materials (specially adapted for boreholes or wells C09K8/00; fertilisers C05; consolidating by placing solidifying or pore-filling substances in the soil E02D3/12) - A01N 25/10: Macromolecular compounds - B01J 20/26: Synthetic macromolecular compounds - C04B 16/08: porous, e.g. expanded polystyrene beads {or microballoons} - C08J 3/12: Powdering or granulating - C08J 9/28: by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum - C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence) - C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres} - C09K 3/32: for absorbing liquids to remove pollution, e.g. oil, gasoline, fat - C08J 2201/0444: Salts - C08J 2201/0543: the non-solvent being organic - C08J 2201/0546: the non-solvent being organic - C08J 2323/12: Polypropene - C08L 23/12: Polypropene - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - 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) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract The invention relates to a process producing porous powdery polymer particles. A homogeneous mixture having two components minimum, one a meltable polymer, the other fluid inert to the polymer, both forming a system having a range of complete miscibility and a miscibility gap are introduced to a bed of solid-substance particles, then cooling the mixture to below solidification of the polymer and comminuting the obtained cake-like mass. The polymer is separated then from the inert fluid and solid-like substance particles. ## Claims ### Claim 1 Process for the production of powdery, porous polymer particles, characterized by the introduction into a bed of solid-substance particles at a temperature above the segregating temperature, of a homogenous mixture having a minimum of two components, one component therein being a meltable polymer and the other component a fluid inert to the polymer, both components forming a binary system which has in its liquid phase a range of complete miscibility and also a range with a miscibility gap, by subsequent cooling said mixture to a temperature below the solidification temperature of the polymer in the mixture, by comminution of the cake-like mass as obtained and by separation of the polymer substance from the inert fluid and solid-substance particles. ### Claim 2 (depends on 1) Process as per claim 1, characterized by using a solid-substance-particle bed of particles with a size from 50 to 5000 .mu.m. ### Claim 3 (depends on 1) Process as per claim 1, characterized by using a solid-substance-particle bed of glass beads. ### Claim 4 (depends on 1) Process as per claim 1, characterized by using salt as solid-substance particles. ### Claim 5 (depends on 4) Process as per claim 4, characterized by using sodium sulfate as salt. ### Claim 6 (depends on 5) Process as per claim 5, characterized by using sodium sulfate with a granule size from 50 to 400 .mu.m. ### Claim 7 (depends on 1) Process as per claim 1, characterized by using polypropylene as polymer. ### Claim 8 (depends on 7) Process as per claim 7, characterized by using polypropylene as polymer and NN-bis-(2-hydroxyethyl)-hexadecylamine as inert fluid. ### Claim 9 (depends on 3) Process as per claim 3, characterized by extracting the inert fluid from the cake obtained, comminuting the cake and separating the glass beads from the polymer particles by reason of their different densities. ### Claim 10 (depends on 9) Process as per claim 9, characterized by size-separation being effected by hydraulic separation. ### Claim 11 (depends on 1) Process as per claim 1, characterized by subjecting the obtained cake first to comminution and then to extraction. ### Claim 12 (depends on 1) Process as per claim 1, characterized by subjecting the obtained cake to simultaneously performed comminution and extraction. ### Claim 13 (depends on 1) Process as per claim 1, characterized by subjecting the obtained cake to simultaneously performed extraction, detaching of solid-substance particles and comminution of the cake. ### Claim 14 (depends on 1) Process as per claim 1, characterized by gradation of the polymeric, powdery porous particles into granule-size fractions by screening, ensuing subsequent to separation of the inert fluid and the solid-substance particles.