GB2451096A - Method of preparing a powdered fluoropolymer blend - Google Patents

Method of preparing a powdered fluoropolymer blend Download PDF

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Publication number
GB2451096A
GB2451096A GB0713891A GB0713891A GB2451096A GB 2451096 A GB2451096 A GB 2451096A GB 0713891 A GB0713891 A GB 0713891A GB 0713891 A GB0713891 A GB 0713891A GB 2451096 A GB2451096 A GB 2451096A
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GB
United Kingdom
Prior art keywords
fluoropolymer
ptfe
particles
sublimation
suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0713891A
Other versions
GB0713891D0 (en
Inventor
Michael Coates
Joel Gines
Andrew J Melville
Leonard W Harvey
Julie K Wright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whitford Plastics Ltd
Whitford Ltd
Original Assignee
Whitford Plastics Ltd
Whitford Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Whitford Plastics Ltd, Whitford Ltd filed Critical Whitford Plastics Ltd
Priority to GB0713891A priority Critical patent/GB2451096A/en
Publication of GB0713891D0 publication Critical patent/GB0713891D0/en
Priority to RU2010101934/05A priority patent/RU2478665C2/en
Priority to CA2693304A priority patent/CA2693304C/en
Priority to US12/669,389 priority patent/US8053549B2/en
Priority to JP2010516566A priority patent/JP5285702B2/en
Priority to CN2008801029122A priority patent/CN101784586B/en
Priority to KR1020107001640A priority patent/KR101525270B1/en
Priority to EP08775953A priority patent/EP2170979B1/en
Priority to AT08775953T priority patent/ATE554129T1/en
Priority to PCT/GB2008/002415 priority patent/WO2009010740A1/en
Priority to ES08775953T priority patent/ES2384483T3/en
Priority to BRPI0812702-6A priority patent/BRPI0812702B1/en
Publication of GB2451096A publication Critical patent/GB2451096A/en
Withdrawn legal-status Critical Current

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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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/005—Processes for mixing polymers
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
    • 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
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
    • 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
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/10—Homopolymers or copolymers of unsaturated ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene

Abstract

A method for the preparation of a modified fluoropolymer powdered material comprises suspending solid fluoropolymer particles together with PTFE particles in an aqueous carrier, which is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of modified fluoropolymer particles. The fluoropolymer is preferably perfluoromethyl vinyl ether (MFA).

Description

Method for the Preparation of Fluoropolymer Powdered Materials The present invention relates to a method for the preparation of Fluoropolymer powdered materials.
Fluoropolymers are long-chain polymers comprising mainly ethylenic linear repeating units in which some or all of the hydrogen atoms are replaced with fluorine. Examples include Poly (tetrafluoroethylene), Perlluoromethyl vinyl ether (MFA), Fluoro ethylene propylene (FEP), Per Fluoro Alkoxy (PFA), Poly(chlorotrilEluoroethylene) and Poly(vinylfluoride). They are amongst the most chemically inert of all polymers and are characterised by an unusual resistance to acids, bases and solvents. They have unusually low frictional properties and have the ability to withstand extremes of temperature. Accordingly, fluoropolymers are utilised in a wide variety of applications in which resistance to extreme environments is necessary. Current applications include the formation of tubing and packing materials within chemical plants, semiconductor equipment, automotive parts and structural cladding.
There are several applications which require the powdered form of the fluoropolymer. The fluoropolymer may be applied to a surface by electrostatic spraying of the powder. Uses would include the coating of household cookware to increase non-stick properties and abrasion resistance, and the coating of automotive parts to increase resistance to environmental weathering.
At present, two methods are generally used to produce the powdered form of a fluoropolymer. Spray drying methods comprise the pumping of an aqueous dispersion of the fluoropolymer feed into an atomising system, generally located at the top of a drying chamber. The liquid is atomised into a stream of heated gas to evaporate the water and produce a dry powder. This method has several limitations. The requirement that the aqueous dispersion is pumped into the atomising system limits the use of this process to pumpable materials, and the spray dried agglomerates are tightly bound to each other and resist subsequent disagglomeration. In addition, only non-fibrillatable materials can be processed, as atomisation may result in the fibrillation of the fluoropolymer, resulting in an intractable marshmallow' material which is difficult to handle.
An alternative method involves the coagulation of the particles within an aqueous dispersion. Coagulation is facilitated by the use of high mechanical shear, the addition of acids or the addition of gelling agents and subsequent treatment with a water immiscible organic liquid. The coagulated particles can be separated from the residual liquid by filtration and subsequently dried, typically using tray, belt or flash dryers. The coagulated granules are usually case hardened for ease of handling. However, the formation of agglomerates results in a particle size that is too large for use in conventional powder spray application techniques. Milling, traditionally used to adjust the particle size distribution, can cause fibrillation of the particles, to produce an intractable material which is difficult to handle. The case hardened material also produces a tight agglomerate which resists subsequent disagglomeration.
In both these methods, it is difficult to incorporate any significant amount of a modifier to improve the barrier properties of the fluoropolymer.
It is therefore an object of the present invention to provide a method for the preparation of a modified fluoropolymer powdered material with improved barrier properties.
According to the present invention there is provided a method for the preparation of a modified fluoropolymer material in powder form which comprises the steps of: forming a suspension of solid particles of the fluoropolymer together with particles of polytetrafluoroethylene (PTFE) as a modifier in an aqueous liquid carrier; freezing the aqueous suspension; and subsequently subjecting the frozen aqueous suspension to sublimation, thereby producing dry particles of the fluoropolymer, modified by the presence of the PTFE modifier, in powder form.
The method of the invention allows more modifier to be added to the polymer thank is possible using conventional techniques.
The modifier particles disperse efficiently between the fluoropolymer particles in the aqueous carrier thus imparting superior barrier properties to the finished powder material. A PTFE/fluoropolymer alloy is produced which is more crystalline in nature than the un- modified fluoropolymer. Post milling or irradiation of the freeze-dried modified fluoropolymer material can also enhance its suitability as a powder coating material.
Preferably, the fluoropolymer is perfluoromethyl vinyl ether (MFA). Preferably the particle size of the fluoropolymer is in the range 30 to 350nm, preferably 200 to 250nm e.g. about 230nm. Preferably, the PTFE modifier has a particle size in the range 30 to35Onm, preferably 200 to 250nm, and is present as up to 50 wt%, preferably 20 to 30 wt% e.g. about 25 wt% of the MFA/PTFE mixture, expressed on a dry weight basis.
The method is particularly suitable for the processing of Perfluoromethyl vinyl ether (MFA), Fluoro ethylene propylene (FE?) and Per Fluoro Alkoxy (PFA).
Preferably, the modified fluoropolymer powdered material has a particle size that is sufficiently small to allow application by conventional powder spray application techniques. The agglomerates (with a primary particle size of about 0.2pm) produced may have an average diameter of from I to I 00Mm, more preferably from to 30gm.
Preferably, the suspension of the solid fluoropolymer particles in the liquid carrier is frozen in a freezer at a temperature below 0°C. More preferably, the suspension is frozen at a temperature in the range -60°C to -20°C. Typically, freezing might be completed in 6 hrs to 24 hrs.
Preferably, the suspension of the solid fluoropolymer particles in the liquid carrier is poured, scooped or otherwise transferred into a tray prior to freezing. Preferably, the tray containing the suspension of the solid fluoropolymer particles is then placed into the freezer and frozen within the tray.
Preferably, the aqueous carrier is water with or without surfactant and with or without bridging solvents (organic solvent used to aid the dispersion/solvating of additional resins). If bridging solvents are used, they should be at concentrations low enough and have high enough melting points so that freezing is not inhibited.
Preferably, the sublimation is carried out using sub-atmospheric pressure or a vacuum. The use of a reduced pressure causes sublimation of the carrier from a frozen state directly to a gaseous state, avoiding the solid to liquid and liquid to gas transition. Preferably, the reduced pressure is created by means of a vacuum pump.
Preferably, the reduced pressure is in the range O.Olatm to 0.99atm, more preferably 0.O4atm to 0.O8atm. Typically, sublimation might be completed in 12 hrs to 48 hrs.
The method is preferably carried out at a temperature which is in practice below the glass transition temperature of the fluoropolymer. The glass transition temperature, I, of a polymer is the temperature at which it changes from a glassy form to a rubbery form. The measured value of Tg will depend on the molecular weight of the polymer, its thermal history and age, and on the rate of heating and cooling. Typical values are MFA about 75C, PFA about 75°C, PEP about -208°C, PVDF about -45°C.
The temperature is controlled to assist the sublimation process and avoid melting of the carrier liquid. It is a beneficial coincidence that these controls also maintain temperatures below the Tg values for some of the materials listed. Thus, the method may be carried out at ambient temperature. Alternatively, the method may be carried out at a temperature above ambient temperature, in order to reduce the time taken to complete the process.
The modified fluoropolymer particles may be treated after sublimation has occurred or at any point during the process of the present invention. Such modifications may include, milling or irradiation of the fluoropolymer. Irradiation of the fluoropolymer would generally be carried out after milling to assist in particle size control. Milling adjusts the particle size distribution of the modified fluoropolymer, for example reducing the mean particle size to produce a finer powder. Typically the milling would be carried out conventionally in a pin or jet mill.
Where the method additionally comprises irradiation of the modified fluoropolymer particles, this would typicallybe carried out on the powder, but alternatively on the suspension. Irradiation adjusts the melt characteristics of the modified fluoropolymer, for example to lower the melting temperatures/glass transition temperatures and increase the melt flow rate.
The method of the present invention does not result in the tight agglomeration of the particles, but instead produces a fine powder, which is suitable for use in extrusion, conventional powder spray application techniques or for redispersion in aqueous or organic media. The friable powder can be broken down easily for particle size modification.
The method of the invention may be carried out at a temperature below the glass transition temperature of the fluoropolymer, in contrast to the known processes involving spray drying and coagulation, which require temperatures well in excess of 100°C. The use of ambient temperature allows greater energy efficiency, while the use of temperatures that are above ambient temperature, but below the glass transition temperature, can be used to increase the speed with which the sublimation proceeds. Temperatures above ambient can also be used to assist secondary drying, to drive off any remaining liquid carrier traces.
The method of the invention can be used to prepare a modified fluoropolymer powdered material whether the fluoropolymer would tend to be fibrillatable or non-fibrillatable. A fibrillatable polymer is one which forms fibers when exposed to a shear force. The known methods, which involve spray drying and coagulation, both expose the solid fluoropotymer particles to shear forces, which can result in the production of an intractable material. The present invention does not involve shear forces at any stage and is therefore suitable for use with a fibrillatable fluoropolymer.
The method of the invention may be used to prepare a modified fluoropolymer powdered material from a pumpable or non-pumpable suspension of the solid fluoropolymer particles in a liquid carrier. The suspension may be non-pumpable because of high viscosity or shear sensitivity. The method does not involve any steps where the suspension must be pumped. Instead, the suspension may be poured or scooped into the tray for freezing, and the solid, frozen block may be transferred into the vacuum chamber.
The invention may be carried into practice in varying ways and some embodiments will now be described in the following Example and with reference to the accompanying drawings, in which: Figure 1 is a DSC curve for MFA; Figure 2 is a DSC curve for PTFE; and Figure 3 is a DSC curve for MFA modified by PTFE in accordance with the invention.
Example I
Experiment with PTFE as modifier with MFA.
An SFN-DN PTFE aqueous dispersion stabilised with 0.6% D6483 (100% polysiloxane) on PTFE solids was added to MFA 6202-1 MFA dispersion to give 25:75 PTFE:MFA solids content. The dispersions were mixed with slow stirring.
The mixture was frozen and freeze-dried. The resulting dry powder was applied by electrostatic spray gun over a Xylan 40l8/G0916 primer on to a grit blasted aluminum panel. The panel was flashed off at 150°C and cured at 400°C for 20 minutes. The powder melted to form a continuous film.
Reference is now made to three DSC data sets in Figures 1 to 3. A comparison of the melting point shift from pure polymers (Figure 1 -MFA and Figure 2 -PTFE) to the alloy (25 PTFE, 75 MFA), show that the polymers form a true alloy and co-crystallize together. The heat of the crystallization of MFA is 21 JIg while for the alloy if is 30 JIg, which indicates the % crystalline increases by 30%. A similar phenomenon is also found in the heat of melting (2 melting curve).
The MFAIPTFE blend produced by this process has certain advantages.
Increasing the crystalline nature of the MFA polymer can be demonstrated by considering the heat of fusion in the DSC data. The high crystalline polymer has better barrier properties. Also, the spray-drying process yields a homogenous blend of PTFE and MFA. Mixing on a nano scale and freeze drying locks polymer particles in place; no macro aggregation of polymers occurs.

Claims (14)

  1. Claims I. A method for the preparation of a modified fluoropolymer material in powder form which comprises the steps of; forming a suspension of solid particles of the fluoropolymer together with particles of polytetrafluoroethylene (PTFE) as a modifier in an aqueous liquid carrier; freezing the aqueous suspension; and subsequently subjecting the frozen aqueous suspension to sublimation, thereby producing dry particles of the fluoropolymer, modified by the presence of the PTFE modifier, in powder form.
  2. 2. A method as claimed in Claim I, in which the fluoropolymer is perfluoromethyl vinyl ether (MFA).
  3. 3. A method as claimed in Claim I or Claim 2, in which the particle size of the fluoropolymer is in the range 30 to 350nm.
  4. 4. A method as claimed in any preceding Claim, in which the PTFE modifier has a particle size in the range 30 to 350NM.
  5. 5. A method as claimed in any preceding claim, in which the PTFE is present as up to 50 wt% of the MFA/PTFE mixture, expressed on a dry weight basis.
  6. 6. A method as claimed in any preceding claim, in which sublimation is achieved by means of a sub-atmospheric pressure.
  7. 7. A method as claimed in Claim 6, in which the reduced pressure is in the range of 0.01 to 0.99atm.
  8. 8. A method as claimed in any preceding claim, in which sublimation is carried out at a temperature below the glass transition temperature of the fluoropolymer.
  9. 9. A method as claimed in Claim 8, in which sublimation is carried out at ambient temperature.
  10. 10. A method as claimed in Claim 8, in which sublimation is carried out at a temperature between ambient temperature and the glass transition temperature of the fluoropolymer.
  11. II. A method as claimed in any preceding claim, in which the suspension of the solid particles in the aqueous carrier is frozen at a temperature in the range -60CC to -20CC.
  12. 12. A method as claimed in any preceding claim, in which the suspension of the solid particles in the aqueous carrier is frozen in trays.
  13. 13. A method as claimed in any preceding claim, in which the modified fluoropolymer particles are subjected to milling and/or irradiation.
  14. 14. A method as claimed in any preceding claim, in which the fluoropolymer is fibrillatable and/or non-pumpable.
GB0713891A 2007-07-17 2007-07-17 Method of preparing a powdered fluoropolymer blend Withdrawn GB2451096A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
GB0713891A GB2451096A (en) 2007-07-17 2007-07-17 Method of preparing a powdered fluoropolymer blend
BRPI0812702-6A BRPI0812702B1 (en) 2007-07-17 2008-07-15 method for the preparation of a powdered modified fluoropolymer material
KR1020107001640A KR101525270B1 (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
CA2693304A CA2693304C (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
US12/669,389 US8053549B2 (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
JP2010516566A JP5285702B2 (en) 2007-07-17 2008-07-15 Method for producing fluoropolymer powder material
CN2008801029122A CN101784586B (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
RU2010101934/05A RU2478665C2 (en) 2007-07-17 2008-07-15 Method of producing fluoropolymer powdered materials
EP08775953A EP2170979B1 (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
AT08775953T ATE554129T1 (en) 2007-07-17 2008-07-15 METHOD FOR PRODUCING POWDERED FLUORPOLYMER MATERIALS
PCT/GB2008/002415 WO2009010740A1 (en) 2007-07-17 2008-07-15 Method for the preparation of fluoropolymer powdered materials
ES08775953T ES2384483T3 (en) 2007-07-17 2008-07-15 Procedure for preparing fluoropolymer materials in powder form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0713891A GB2451096A (en) 2007-07-17 2007-07-17 Method of preparing a powdered fluoropolymer blend

Publications (2)

Publication Number Publication Date
GB0713891D0 GB0713891D0 (en) 2007-08-29
GB2451096A true GB2451096A (en) 2009-01-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0713891A Withdrawn GB2451096A (en) 2007-07-17 2007-07-17 Method of preparing a powdered fluoropolymer blend

Country Status (12)

Country Link
US (1) US8053549B2 (en)
EP (1) EP2170979B1 (en)
JP (1) JP5285702B2 (en)
KR (1) KR101525270B1 (en)
CN (1) CN101784586B (en)
AT (1) ATE554129T1 (en)
BR (1) BRPI0812702B1 (en)
CA (1) CA2693304C (en)
ES (1) ES2384483T3 (en)
GB (1) GB2451096A (en)
RU (1) RU2478665C2 (en)
WO (1) WO2009010740A1 (en)

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US20100132212A1 (en) * 2006-01-16 2010-06-03 Michael Coates Method for the preparation of fluoropolymer powdered materials

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EP2291452B1 (en) * 2008-05-30 2018-01-24 Whitford Corporation Blended fluoropolymer compositions
JP5655785B2 (en) 2008-09-26 2015-01-21 ウィットフォード コーポレーション Fluoropolymer blend compositions and coatings for flexible substrates
TW201016800A (en) 2008-09-26 2010-05-01 Whitford Corp Blended fluoropolymer coatings for rigid substrates
RU2549562C2 (en) 2009-12-18 2015-04-27 Уитфорд Корпорейшн Mixed fluoropolymer compositions, having multiple melt-processed fluoropolymers
BR112012026419B1 (en) * 2010-04-15 2020-05-26 Whitford Corporation FLUORPOLYMER COATING COMPOSITIONS AND A SUBSTRATE COATING METHOD
TWI492978B (en) * 2013-07-24 2015-07-21 Grand Tek Advance Material Science Co Ltd Composite micropowder, ceramic paint, protective coating, and method for manufacturing composite micropowder
US20180179342A1 (en) * 2015-05-27 2018-06-28 Solvay Specialty Polymers Italy S.P.A. Anti-sticking treatment for low cristallinity fluoropolymer particles

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US8166668B2 (en) * 2006-01-16 2012-05-01 Whitford Plastics Limited Method for the preparation of fluoropolymer powdered materials

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JP5285702B2 (en) 2013-09-11
CA2693304A1 (en) 2009-01-22
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BRPI0812702B1 (en) 2020-12-08
CN101784586B (en) 2013-04-03
EP2170979A1 (en) 2010-04-07
CA2693304C (en) 2016-04-26
RU2478665C2 (en) 2013-04-10
US8053549B2 (en) 2011-11-08
JP2010533763A (en) 2010-10-28
CN101784586A (en) 2010-07-21
ES2384483T3 (en) 2012-07-05
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US20100204440A1 (en) 2010-08-12
ATE554129T1 (en) 2012-05-15

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