WO1997016478A1 - Post-consumer recycled plastics - Google Patents
Post-consumer recycled plastics Download PDFInfo
- Publication number
- WO1997016478A1 WO1997016478A1 PCT/US1996/017694 US9617694W WO9716478A1 WO 1997016478 A1 WO1997016478 A1 WO 1997016478A1 US 9617694 W US9617694 W US 9617694W WO 9716478 A1 WO9716478 A1 WO 9716478A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chips
- range
- volatile impurities
- superficial velocity
- gas
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- This invention is related to a process for removing volatiles from post-consumer recycled polyolefins.
- the post-consumer recycled (PCR) polyolefins contemplated for use in subject process can be exemplified by the PCR polyethylenes and PCR polypropylenes.
- the most typical of the PCR polyolefins are the PCR polyethylenes since these plastics are most readily available for recycling.
- the specifications for the PCR polyethylenes can be found under ASTM D-5203-91.
- polyethylenes are originally prepared by conventional catalytic processes.
- Illustrative of post-consumer recycled polyethylene, as used herein is polyethylene, which has passed through the hands of the manufacturer of the polyethylene, the fabricator, the industrial utilizer ofthe fabricated article, and, finally, the ultimate consumer. A similar path is taken by other polyolefins.
- fabricated articles are film, sheet, bottles, bags, and other containers such as medical containers, which can be sterilized at or above the temperature of boiling water; food containers for use in a microwave oven or for holding food during cooking; greenhouse film; mulch film; masking film for painting; and sunscreen oil containers.
- Polyolefins absorb volatiles from materials that have been in contact with, or ih close proximity to, them.
- the fragrances used in the soaps diffuse into the plastic and impart an odor.
- the odor may be objectionable if the resin is recycled and used for an application where no odor or a different odor is desired. Odor is not the only concern. Pesticides and other pollutants can be absorbed by polyolefins and impart unwanted characteristics to the polymer. If a recycled resin is to be used in an application where there is contact with food, the material must not impart contaminants to the food. In fact, the PCR polyolefin must meet FDA regulations for food contact.
- Purge bins have been effective devices for removing volatiles from polymers. They are especially useful when the particles being cleaned are small and round in shape. In the case of chopped plastic bottles, however, the chopping results in chips typically having dimensions from 3/8 inch to 1 and 1/4 inches in diameter. The thickness of these particular chips ranges from 1/64 inch to 1 16 inch. Chips having this geometry do not perform well in conventional fluidized beds such as the fluidized bed described in United States Patent 4,482,687. To achieve effective purging in these fluidized beds, each chip must be swept with a stream of cleaning fluid. With round particles it is easy for the fluid to pass through the bed and sweep each particle.
- An object of this invention is to provide a process for removing volatiles from chips comprised of PCR polyolefin.
- the process comprises contacting PCR polyolefin chips containing volatile impurities with a heated gas at a superficial velocity sufficient to substantially reduce the volatile impurities. This process is found to cause the chips (i) to be essentially free of odors and (ii) subject to resin composition and prior use, to meet FDA regulations for direct food contact.
- a preferred embodiment ofthe process comprises contacting PCR polyolefin chips containing volatile impurities (i) in a stirred bed with a heated gas, said gas passing through the chips at a superficial velocity of at least about 0.9 foot per second or (ii) in a fluidized bed with a heated gas, said gas passing through the chips at a superficial velocity of at least about 4 feet per second.
- PCR polyolefin chips are obtained by chopping up polyolefin containers or other extruded or molded products, which have been gathered at curbside.
- the PCR polyolefin chips can be described as irregular pieces of plastic, a major proportion (greater than 50 percent) by weight of which are each about 0.375 to about 1.25 inches in longest dimension and about 0.01 to about 0.07 in thickness. Preferably, at least about 70 percent by weight ofthe chips have these dimensions.
- a typical chopping device is a granulator comprised of a rotating drum having a cutting edge; sharp blades; and a screen with, for example, 5/8 inch holes. The chips are usually pelletized for further processing.
- the original polyolefin can be produced in a conventional manner by a wide variety of well known catalytic processes.
- the processes are generally distinguished by their catalyst systems and examples of same are as follows: magnesium/titanium based catalyst systems, which can be exemplified by the catalyst system described in United States patent 4,302,565; vanadium based catalyst systems such as those described in United States patents 4,508,842 and 5,332,793; 5,342,907; and 5,410,003 ; a chromium based catalyst system such as that described in United States patent 4,101,445; metallocene catalyst systems such as those described in United States patents 4,937,299 and 5,317,036; or other transition metal catalyst systems.
- Catalyst systems which use chromium or molybdenum oxides on silica-alumina supports, are also useful.
- Typical processes for preparing the polyethylenes are also described in the aforementioned patents.
- Typical in situ polyethylene blends and processes and catalyst systems for providing same are described in United States Patents 5,371,145 and 5,405,901. Insofar as polypropylene processes are concerned. United States Patents 4,414,132 and 5,093,415 can be mentioned. These processes also use Ziegler-Natta, metallocene, etc. catalyst systems, but generally include an outside electron donor.
- the polyethylenes can include homopolymers; high (HDPE), medium, and low density polyethylenes; linear low density polyethylenes (LLDPE); and very low density polyethylenes (VLDPE), all of which can be made by low pressure processes, and various polymers made by high pressure techniques, e.g., homopolymers of ethylene, ethylene/vinyl acetate copolymers, and ethylene/ethyl acrylate copolymers.
- high high
- LLDPE linear low density polyethylenes
- VLDPE very low density polyethylenes
- the original polyolefin containers and other articles, which can be recycled, can be prepared by conventional extrusion techniques such as blown tubular film extrusion ( see discussion in United States Patent 4,814,135) and pipe and sheet extrusion, and by blow molding, injection molding, rotational molding, and slot casting.
- Extruders and processes for extrusion are described in United States patents 4,169,679; 4,814,135; 4,857,600; 5,076,988; and 5,153,382.
- Examples of various extruders are a single screw type such as one modified with a blown film die and air ring and continuous take off equipment; a blown film extruder; and a slot cast extruder.
- Twin screw extruders can also be considered.
- a typical single screw type extruder can be described as one having a hopper at its upstream end and a die at its downstream end. The hopper feeds into a barrel, which contains a screw. At the downstream end, between the end of the screw and the die, is a screen pack and a breaker plate.
- the screw portion ofthe extruder is considered to be divided up into three sections, the feed section, the compression section, and the metering section, and multiple heating zones from the rear heating zone to the front heating zone, the multiple sections and zones running from upstream to downstream. If it has more than one barrel, the barrels are connected in series.
- the length to diameter ratio of each barrel is in the range of about 16:1 to about 30:1.
- the extrusion can take place at temperatures in the range of about 160 to about 270 degrees C, and is preferably carried out at temperatures in the range of about 180 to about 240 degrees C.
- preferred articles for recycle are those made from FDA compliant polyethylenes, i.e. cleared for food contact applications, particularly beverage containers such as those used for milk, juice, and water. These containers are selected by a technique known as "source control", which simply means that they are sorted out by hand. The containers are then chopped up to provide the chips referred to above. Chopping is considered to be the most economical way to handle these containers, but, heretofore, the removal of volatile impurities from these chips was a problem. It will be seen that the source controlled chips contact only innocuous GRAS (generally recognized as safe) substances during the process of this invention, and, therefore, are suitable for direct contact with food.
- GRAS generally recognized as safe
- the chips are preferably introduced into a stirred bed, and a heated gas such as nitrogen or other inert gas, or air, is passed through the stirred bed, the chips from the top and the gas from the bottom.
- a heated gas such as nitrogen or other inert gas, or air
- the superficial velocity ofthe gas can be at least about 0.9 feet per second, and is preferably in the range of about 1.1 to about 2.1 feet per second. It will be understood that the smaller the chip, the lower the effective superficial velocity.
- a typical stirred bed used in the process of this invention is a cylindrical vessel with the axis ofthe vessel in a vertical orientation.
- Hot gas such as air is introduced from the bottom of the vessel, flows in an upward direction, and exits from the top.
- a distributor plate is located in close proximity to the bottom of the vessel and directs the gas flow through many small holes. This insures the uniform distribution of the gas across the entire cross section ofthe vessel.
- a shaft along the axis ofthe vessel with protruding arms is rotated to keep the chips moving gently.
- the shaft generally rotates at a rate of about 2 to about 25 revolutions per minute (rpm), preferably rotates at a rate of about 3 to about 12 rpm, and most preferably rotates at about 4 to about 8 rpm.
- the chips rotate as a plug with the shaft and arms since they tend to lightly interlock. If this stirring is not provided, large air channels develop and only some of the chips are cleansed by the flowing gas.
- the chips move in a plane parallel to the plane of the vessel and very little mixing occurs from top to bottom.
- This feature makes the process of this invention suitable for a continuous process since the last material introduced into the stirred bed is the last out.
- a preferred stirred bed will have stationary bars protruding from the walls ofthe vessel. These bars protrude into the stirred bed and prevent the entire bed from rotating with the shaft and arms. Six inch spacing between arms and six inch spacing between stationary bars, for example, can be used to good effect. The bars are centered between the rotating arms to provide a clearance of about 3 inches.
- the sphericity the closeness to being a sphere
- Sphericity for unusual shapes can be calculated by formula. Typical shapes that perform well in fluid beds have sphericity values between 0.7 and 1.0. A perfect sphere has a value of 1.0.
- the sphericity is 0.23. This value is substantially below that of shapes that are typically used in fluidized beds.
- the chips do not suspend in an air stream with bubbles flowing through the bed as is typical when the sphericity is between 0.7 and 1.0.
- the superficial velocity (the volume of air per unit time divided by the cross sectional area of the fluidized bed) is usually in the range of 0.5 to 2.0 feet per second for common fluidized bed operations.
- the superficial velocity of the heated gas is preferably at least about 4 feet per second, and more preferably 6 to 15 feet per second, to be effective. Even at these velocities, however, clumps are formed on conventional fluidized bed distributor plates. That is one reason why the stirred bed is preferred. Further, the stirred bed uses less gas at a much lower superficial velocity than the fluidized bed, an important economic advantage.
- the temperature of the gas in the stirred bed or fluidized bed can be in the range of about 50 to about 120 degrees C, and is preferably in the range of about 90 to about 115 degrees C.
- the upper limit of temperature should be below the melting point of the chips to be processed.
- the residence time in both of the beds can be in a range of about 1 to about 15 hours, and even longer, but it is preferably in the range of about 3 to about 10 hours.
- Some preferred conditions for subject process are as follows: stainless steel vessel and other materials contacting the chips; insulated, flat bottom, top loading vessel; and sizing of vessel based on 5 hour residence time for natural chips and 6 hour residence time for colored chips.
- the advantage of the invention is that the amount of volatile impurities in the chips can be substantially reduced, i.e., by more than about 90 percent by weight. In the preferred mode, the result is that the chips are essentially free of volatile impurities.
- the term " essentially free” means less than about 500 ppb, and preferably less than about 200 ppb.
- the invention is illustrated by the following examples. The results are given in parts per million (ppm) or parts per billion (ppb), i.e., parts by weight of impurity per million or billion parts by weight of PCR resin.
- Table I is concerned with the removal of a common impurity, limonene, from PCR polyethylene chips as a function of time when cleaned with air at various temperatures in a fluidized bed.
- the superficial velocity is about 12 feet per second.
- At least 80 percent by weight ofthe chips referred to examples 1 to 3 have the dimensions stated above. Testing in all of the examples is done by head space gas chromatography.
- Table II shows the result of analysis of PCR high density polyethylenes (HDPE).
- the density is in the range of 0.940 to 0.970 gram per cubic centimeter, and is generally at least 0.950 gram per cubic centimeter.
- Each impurity is introduced into a virgin HDPE bottle to saturation.
- the bottles are chopped into chips, and treated in a stirred bed with air heated to 110 degrees C.
- the superficial velocity is 1.46 feet per second. Testing is done by head space gas chromatography. Table II
- the following Table III shows the result of analysis of curbside PCR HDPE containers.
- the densities are in the range of about 0.956 to about 0.968 gram per cubic centimeter, and are generally at least about 0.960 gram per cubic centimeter.
- curbside simply means that the containers are gathered from consumers, and the impurities come from the original contents ofthe containers or other liquids introduced into the containers by the consumers.
- the containers are chopped into chips, and treated in a fluidized bed with air heated to 105 degrees C and at a superficial velocity of about 12 feet per second.
- Testing for organophosphate pesticides is effected according to "Organophosphorous Pesticides" 40 CFR 455, Method 622, October 4, 1985, and 'Test Methods for Evaluating Sohd Waste", SW846, 3rd Edition, Methods 8140 and 8141, December 1987.
- Testing for polynuclear aromatic hydrocarbons (HPLC) is effected according to "Polynuclear Aromatic Hydrocarbons in Municipal and Industrial Wastewater", 40CFR 136, Method 610, October 26, 1984, and “Test Methods for Evaluating Solid Waste", Method 8310, Polynuclear Aromatic Hydrocarbons, SW846, September 1986.
- Limonene >200,000 6300 900 540
- the density is in the range of 0.940 to 0.970 gram per cubic centimeter, and is generally at least 0.950 gram per cubic centimeter.
- the impurity, limonene is introduced during the washing process. Limonene is a component ofthe detergent system. Milk, water, and juice bottles are collected at the curbside, chopped into chips, and washed in a commercial plastics recycling facility. Following washing and drying the chips are fed to a stirred bed vessel having an inside diameter of 36 inches. The air and chip temperature is 105 degrees C. The superficial air velocity is 1.37 feet per second. The agitator rotates at 9 rpm.
- Chips are added at a rate of 90 pounds per hour for five hours, and then the chips are removed at the same rate. Chip removal is through a rotary air lock discharging 3.75 pounds every 150 seconds. All chips have 5 hours of exposure to the hot air flow. The chips that have been washed and not treated by the clean up process have 23,000 ppb (parts per billion) limonene. Table IV gives limonene analysis in ppb for chips taken every 20 minutes for 5 hours. TABLE IV
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96938765A EP0859809A1 (en) | 1995-11-02 | 1996-11-01 | Post-consumer recycled plastics |
AU76067/96A AU702657B2 (en) | 1995-11-02 | 1996-11-01 | Process for removing volatiles from post-consumer recycled polyolefin chips |
CA 2236642 CA2236642C (en) | 1995-11-02 | 1996-11-01 | Post-consumer recycled plastics |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US614795P | 1995-11-02 | 1995-11-02 | |
US60/006,147 | 1995-11-02 | ||
US08/674,020 US5767230A (en) | 1995-11-02 | 1996-07-01 | Process for removing volatiles from post-consumer recycled polyolefin chips |
US08/674,020 | 1996-07-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997016478A1 true WO1997016478A1 (en) | 1997-05-09 |
Family
ID=26675246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/017694 WO1997016478A1 (en) | 1995-11-02 | 1996-11-01 | Post-consumer recycled plastics |
Country Status (6)
Country | Link |
---|---|
US (1) | US5767230A (en) |
EP (1) | EP0859809A1 (en) |
AU (1) | AU702657B2 (en) |
CA (1) | CA2236642C (en) |
MX (1) | MX9803555A (en) |
WO (1) | WO1997016478A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7776998B2 (en) | 2002-10-30 | 2010-08-17 | Ineos Manufacturing Belgium Nv | Polymer treatment |
EP3964542A1 (en) * | 2020-09-02 | 2022-03-09 | Borealis AG | Removal of odorants from post-consumer polyolefin waste |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW421608B (en) * | 1996-11-12 | 2001-02-11 | Mitsubishi Gas Chemical Co | Method for drying resin-used electronic parts |
DE10260745A1 (en) * | 2002-12-23 | 2004-07-01 | Outokumpu Oyj | Process and plant for the thermal treatment of granular solids |
US7915351B2 (en) * | 2007-02-05 | 2011-03-29 | Pbi Performance Products, Inc. | Polybenzimidazole-polyetherketoneketone blends and miscible blends |
WO2010090863A2 (en) | 2009-01-21 | 2010-08-12 | Rentech, Inc. | System and method for dual fluidized bed gasification |
US9028734B2 (en) | 2009-12-03 | 2015-05-12 | Consolidated Container Company Lp | Process of producing PCR pellets |
EP3708936B1 (en) | 2019-03-15 | 2024-04-17 | Polymetrix AG | Method for recycling of polyolefins |
EP3947555A1 (en) | 2019-03-29 | 2022-02-09 | Borealis AG | Recycled polyethylene-polypropylene blends comprising a compatibilizer |
EP3947554B1 (en) | 2019-03-29 | 2023-05-03 | Borealis AG | Compatibilization of recycled polyethylene-polypropylene blends |
EP3763777B1 (en) * | 2019-07-08 | 2022-03-16 | Borealis AG | Aldehyde content reduction process and recycled polyolefin with low aldehyde content |
EP4017916B1 (en) | 2019-08-19 | 2023-05-24 | Borealis AG | Polypropylene - polyethylene blends with improved properties |
FI3916047T3 (en) | 2020-05-29 | 2022-12-15 | Upgraded high gloss recycling composition | |
EP4171942A1 (en) * | 2020-06-24 | 2023-05-03 | Trioworld Nyborg A/S | Tubular film for stretch hoods comprising recycled material |
WO2022015529A1 (en) | 2020-07-15 | 2022-01-20 | Dow Global Technologies Llc | Process for removal of contaminants from contaminated thermoplastic |
AU2021388787A1 (en) | 2020-11-25 | 2023-06-01 | Borealis Ag | Removal of odorants from post-consumer polyolefin waste |
EP4063452A1 (en) | 2021-03-26 | 2022-09-28 | Borealis AG | Mixed-plastics-polypropylene blend |
JP2024512031A (en) | 2021-03-26 | 2024-03-18 | ボレアリス エージー | mixed plastic polypropylene blend |
JP7331291B2 (en) * | 2021-04-09 | 2023-08-22 | 花王株式会社 | Method for manufacturing recycled resin |
AU2022285104A1 (en) | 2021-05-31 | 2024-01-18 | Borealis Ag | Polyethylene blend |
WO2023180258A1 (en) | 2022-03-22 | 2023-09-28 | Borealis Ag | Post-consumer recyclated colored polyethylene composition, method for its preparation and articles made therefrom |
WO2023180260A1 (en) | 2022-03-22 | 2023-09-28 | Borealis Ag | Post-consumer recyclated colored polypropylene composition |
WO2023180529A1 (en) | 2022-03-25 | 2023-09-28 | Borealis Ag | Removal of odorants from polyolefin particles |
EP4269498A1 (en) | 2022-04-29 | 2023-11-01 | Borealis AG | A flexible mixed-plastic polypropylene blend (pp-flex) |
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GB1272778A (en) * | 1968-09-26 | 1972-05-03 | Basf Ag | Removing volatile constituents from particulate olefin polymers produced by gas-phase polymerization |
US5443652A (en) * | 1993-06-30 | 1995-08-22 | Union Carbide Chemicals & Plastics Technology Corporation | Method and apparatus for cleaning contaminants from plastics |
Family Cites Families (5)
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US3177193A (en) * | 1960-07-15 | 1965-04-06 | Phillips Petroleum Co | Process of improving the moldability and extrudability of solid olefin polymers |
US3177953A (en) * | 1961-10-23 | 1965-04-13 | Axel H Pcterson | Vibrator |
US4974336A (en) * | 1988-02-26 | 1990-12-04 | Permian Research Corporation | Drying method |
US5139694A (en) * | 1991-05-08 | 1992-08-18 | Union Carbide Chemicals & Plastics Technology Corporation | Cleaning composition for resin processing equipment |
US5292863A (en) * | 1992-11-02 | 1994-03-08 | Union Carbide Chemicals | Process for removing unpolymerized gaseous monomers from olefin polymers |
-
1996
- 1996-07-01 US US08/674,020 patent/US5767230A/en not_active Expired - Lifetime
- 1996-11-01 CA CA 2236642 patent/CA2236642C/en not_active Expired - Fee Related
- 1996-11-01 EP EP96938765A patent/EP0859809A1/en not_active Ceased
- 1996-11-01 WO PCT/US1996/017694 patent/WO1997016478A1/en not_active Application Discontinuation
- 1996-11-01 AU AU76067/96A patent/AU702657B2/en not_active Ceased
-
1998
- 1998-05-04 MX MX9803555A patent/MX9803555A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1272778A (en) * | 1968-09-26 | 1972-05-03 | Basf Ag | Removing volatile constituents from particulate olefin polymers produced by gas-phase polymerization |
US5443652A (en) * | 1993-06-30 | 1995-08-22 | Union Carbide Chemicals & Plastics Technology Corporation | Method and apparatus for cleaning contaminants from plastics |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7776998B2 (en) | 2002-10-30 | 2010-08-17 | Ineos Manufacturing Belgium Nv | Polymer treatment |
US7790842B2 (en) | 2002-10-30 | 2010-09-07 | Ineos Manufacturing Belgium Nv | Polymer treatment |
EP3964542A1 (en) * | 2020-09-02 | 2022-03-09 | Borealis AG | Removal of odorants from post-consumer polyolefin waste |
WO2022049068A1 (en) * | 2020-09-02 | 2022-03-10 | Borealis Ag | Removal of odorants from post-consumer polyolefin waste |
TWI796773B (en) * | 2020-09-02 | 2023-03-21 | 奧地利商柏列利斯股份公司 | Process for reducing the hydrophobic functional group-containing volatile organic compound content and hydrophilic volatile organic compound content of recycled polyolefin and use of the process |
Also Published As
Publication number | Publication date |
---|---|
AU702657B2 (en) | 1999-02-25 |
US5767230A (en) | 1998-06-16 |
EP0859809A1 (en) | 1998-08-26 |
AU7606796A (en) | 1997-05-22 |
CA2236642A1 (en) | 1997-05-09 |
MX9803555A (en) | 1998-11-30 |
CA2236642C (en) | 2005-09-13 |
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