WO2004076539A1 - 低分子量ポリテトラフルオロエチレン造粒粉末、低分子量ポリテトラフルオロエチレン粉末及びこれらの製造方法 - Google Patents
低分子量ポリテトラフルオロエチレン造粒粉末、低分子量ポリテトラフルオロエチレン粉末及びこれらの製造方法 Download PDFInfo
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- 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
- C08J3/124—Treatment for improving the free-flowing characteristics
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F14/00—Homopolymers and 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
- C08F14/18—Monomers containing fluorine
- C08F14/26—Tetrafluoroethene
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- 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
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a low molecular weight polytetrafluoroethylene granulated powder, a low molecular weight polytetrafluoroethylene powder, and a method for producing these.
- Low molecular weight polytetrafluoroethylene is used as an additive in mating materials such as inks and cosmetics, for example, to reduce friction on the mating material surface and improve slipperiness. It has been used for the purpose of improving the texture of the surface.
- Examples of the low molecular weight polytetrafluoroethylene include those obtained by an emulsion polymerization method (see, for example, JP-A-51-41085 and JP-A-7-165828), and high-molecular-weight polytetrafluoroethylene. Obtained by pyrolysis (for example, JP-A-49-39642, JP-B-7-5744, JP-B-50-15506, JP-A-61-118331, and Japanese Patent Application Laid-Open No. 61-162503.) And those obtained by irradiating molded products such as high molecular weight polytetrafluoroethylene powdered scraps with radiation (for example, Japanese Patent Publication No.
- the problems of the low molecular weight polytetrafluoroethylene powder and the formation of hopper ⁇ ⁇ may be due to the fact that the powder is composed of ultrafine particles.
- the powder is composed of ultrafine particles.
- the dispersibility when mixed with the counterpart material is deteriorated.
- Low-molecular-weight polytetrafluoroethylene is directly obtained by polymerization in view of simplification of the process and narrowing of the molecular weight distribution, and it is desirable that a post-process for lowering the molecular weight is not required.
- An emulsion polymerization method is known as a method directly obtained by polymerization, but a method based on suspension polymerization is not known (for example, see Japanese Patent Application Laid-Open No.
- the low molecular weight polytetrafluoroethylene obtained by polymerization also has a specific surface area of 7 to 2 Is known (for example, see Japanese Patent Application Laid-Open No. H10-147476).
- this powder had a problem that particles fluttered and adhered to the hopper.
- the present invention provides a low-molecular-weight polytetrafluoroethylene granulated powder having reduced powder flutter and adhesion to a hopper, a low-molecular-weight polytetrafluoroethylene powder obtained by suspension polymerization, Another object of the present invention is to provide a method for manufacturing these.
- the present invention provides a low-molecular-weight polytetrafluoroethylene having a number-average molecular weight of 600,000 or less.
- a low-molecular-weight polytetrafluoroethylene granulated powder obtained by granulation from low-molecular-weight polytetrafluoroethylene particles composed of len.
- the present invention relates to a method for producing a low-molecular-weight polytetrafluoroethylene granulated powder, comprising producing the low-molecular-weight polytetrafluoroethylene-granulated powder from the low-molecular-weight polytetrafluoroethylene particles by a granulation treatment.
- the granulation treatment is performed using an aqueous dispersion of low molecular weight polytetrafluoroethylene in which the low molecular weight polytetrafluoroethylene particles are dispersed in an aqueous dispersion medium in the presence of a surfactant.
- a method for producing a low-molecular-weight polytetrafluoroethylene granulated powder which is carried out at a temperature of at least 0 ° C and less than 100 ° C.
- the present invention relates to a method for producing a low-molecular-weight polytetrafluoroethylene granulated powder, comprising producing the low-molecular-weight polytetrafluoroethylene-granulated powder from the low-molecular-weight polytetrafluoroethylene particles by a granulation treatment.
- the granulation treatment is performed by dispersing the low-molecular-weight polytetrafluoroethylene particles in an aqueous dispersion medium in the presence or absence of a surfactant in a low-molecular-weight polytetrafluoroethylene aqueous dispersion.
- the low molecular weight polytetrafluoroethylene aqueous dispersion contains a water-insoluble liquid, and the surfactant includes the low molecular weight polytetrafluoroethylene particles 100.
- the present invention provides a low-molecular-weight polytetrafluoroethylene polymer having a melt viscosity measured at 350 ° C. using a flow tester method of not more than 250 Pas and obtained by suspension polymerization. It is a fluoroethylene powder.
- the present invention provides a low molecular weight compound characterized by having a specific surface area of less than 7 m 2 / g and a melt viscosity measured by a flow tester method at 34 ° C. of 250 Pas or less. Amount of polytetrafluoroethylene powder.
- the present invention provides a method for producing a low-molecular-weight polytetrafluoroethylene powder by producing the low-molecular-weight polytetrafluoroethylene powder by suspension polymerization using a chain transfer agent, wherein the chain transfer agent is hydrogen, A lower saturated hydrocarbon or a lower alcohol.
- the suspension polymerization is carried out at a liquid temperature of 40 ° C. or higher and lower than 100 ° C. using a polymerization initiator.
- sulfate or sulfite A method for producing a low-molecular-weight polytetrafluoroethylene powder, comprising:
- the present invention provides a method for producing a low-molecular-weight polytetrafluoroethylene powder by producing the low-molecular-weight polytetrafluoroethylene powder by suspension polymerization using a chain transfer agent, wherein the chain transfer agent is hydrogen, A lower saturated hydrocarbon or a lower alcohol; the suspension polymerization is carried out at a liquid temperature of 5 to 40 ° C. using a polymerization initiator; and the polymerization initiator is a persulfate or a sulfite and Alternatively, the present invention provides a method for producing a low-molecular-weight polytetrafluoroethylene powder, which comprises an organic peroxide and a redox catalyst.
- the present invention low molecular weight poly tetrafluoropropoxy O b Ethylene powder 2 5 0 ° C or higher, 340
- a low molecular weight polytetrafluoroethylene gelled powder which is obtained through a heat treatment of heating at a temperature of less than ° C.
- low molecular weight polytetrafluoroethylene granulated powder (hereinafter referred to as “low molecular weight PTFE granulated powder”) of the present invention is a low molecular weight polytetrafluoroethylene (hereinafter referred to as “low molecular weight PTFE”). It is obtained by granulation from low molecular weight PTFE particles composed of
- the low-molecular-weight PTFE has a number average molecular weight of 600,000 or less. If the molecular weight exceeds 600,000, fibrillation properties are exhibited and aggregation is liable to occur, so that fine dispersion may be poor. If the number average molecular weight of the low molecular weight PTFE is within the above range, a preferable lower limit can be, for example, 10,000. If it is less than 10,000, it has high volatility at high temperatures and may not be suitable for heat-resistant paints such as paints requiring baking.
- the number-average molecular weight of the low-molecular-weight PTFE is a value calculated from the melt viscosity measured using a flow tester method.
- the low-molecular-weight PTFE has a number-average molecular weight of 600,000 or less
- a low-molecular-weight PTFE obtained by the below-described polymerization method a high-molecular-weight polytetrafluoroethylene obtained by thermal decomposition, Molecular weight polytetrafluoro Any of those obtained by irradiating ethylene with radiation may be used.
- the low-molecular-weight PTFE is tetrafluoroethylene homopolymer [TFE homopolymer] and / or modified polytetrafluoroethylene [modified PTFE].
- TFE homopolymer and / or modified PTFE refers to a substance consisting of a homopolymer and not containing a modified polymer, a substance consisting of a modified PTFE and not containing a TFE homopolymer, or TFE. It means any one consisting of a homopolymer and a modified PTFE.
- polytetrafluoroethylene in the term “low molecular weight PTFE” may generally represent the TFE homopolymer, but in the present specification, the term “low molecular weight PTFE” refers to a TFE homopolymer and As is clear from the fact that it is a modified PTFE, it is not intended to be limited to the TFE homopolymer, but is only a part of the above-mentioned “low molecular weight PTFE”.
- low molecular weight PTFE as a whole refers to TFE homopolymer and / or modified PTFE.
- the TFE homopolymer is obtained by polymerizing only tetrafluoroethylene [TFE] as a monomer.
- the modified PTF E means a polymer obtained from TFE and a modifying agent.
- the modifier in the modified PTFE is not particularly limited as long as it can be copolymerized with TFE, and examples thereof include perfluoroolefins such as hexafluoropropene [HFP]; chlorotrinoleoethylene [CTFE]; Hydrogen-containing fluorofluorin such as trifluoroethylene; perfluorobier ether, and the like.
- perfluoroolefins such as hexafluoropropene [HFP]; chlorotrinoleoethylene [CTFE]; Hydrogen-containing fluorofluorin such as trifluoroethylene; perfluorobier ether, and the like.
- R i represents a perfluoro organic group.
- the “perfluoro organic group” means an organic group in which all hydrogen atoms bonded to carbon atoms are replaced with fluorine atoms.
- the perfluoro organic group may have ether oxygen.
- the perfluorovinyl ether include, for example, perfluoro (alkyl butyl ether) [P] in which R f represents a perfluoroalkyl group having 1 to 10 carbon atoms in the general formula U). AV E].
- the perfluoroalkyl group preferably has 1 to 5 carbon atoms.
- Examples of the perfluoroalkyl group in the above PAVE include a perfluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, a perfluoropentyl group, and a perfluorohexyl group. And the like, but a perfluoropropyl group is preferred.
- perfluorovinyl ether examples include a compound represented by the following formula (I), wherein R f is a perfluoro (alkoxyalkyl) group having 4 to 9 carbon atoms;
- n an integer of 1 to 4.
- a perfunoleo port (alkoxyalkylvininoleate or perfluoro (alkylpolyoxyalkylenebutyl ether)) which represents an organic group represented by Can be
- perfluorovinyl ether and chlorotrifluoroethylene are preferable, and as the perfluorovinyl ether, AVE is preferable.
- the proportion (mass 0/0) of the modifier in the modified PTFE is accounted the entire amount of the modifying agent and TFE, for example, the per full O b vinyl as the modifying agent described above When an ether is used, it is usually preferably 1% by mass or less, more preferably 0.001 or more.
- modified PTFE for example, one kind or two or more kinds having different number average molecular weights, copolymer compositions and the like may be used.
- TFE homopolymer for example, one kind or one having different number average molecular weights may be used. Two or more kinds may be used.
- the method for polymerizing the low molecular weight PTFE is not particularly limited, and examples thereof include emulsion polymerization and suspension polymerization.
- a chain transfer agent may be used for the polymerization of the low-molecular-weight PTFE.
- the molecular weight of the obtained low molecular weight PTFE can be adjusted, and the dispersibility can be improved as an additive to a partner material.
- the chain transfer agent is not particularly limited as long as it is hydrogen, lower saturated hydrocarbon or lower alcohol.
- the lower saturated hydrocarbon include linear or cyclic alkanes having 1 to 6 carbon atoms, such as methane, ethane, propane, butane, hexane, and cyclohexane.
- alcohols having 1 to 3 carbon atoms such as methanol and ethanol are exemplified.
- an unstable terminal group derived from the chemical structure of the polymerization initiator and the chain transfer agent described below is generated at the molecular chain terminal of the low-molecular-weight PTFE.
- the unstable terminal group is not particularly limited, and examples include —CH 2 OH, —C COH, and —COOCH 3 .
- the low-molecular-weight PTFE may be one obtained by stabilizing an unstable terminal group.
- the method for stabilizing the unstable terminal group is not particularly limited, and examples thereof include a method of exposing the terminal to a trifluoromethyl group [1-CF 3 ] by exposing to a fluorine-containing gas.
- the low-molecular-weight PTFE may have been subjected to terminal amidation.
- the method for the terminal amidation is not particularly limited.
- a fluorine obtained by exposure to the above-mentioned fluorine-containing gas is used.
- Examples include a method in which a carbonyl group [1-COF] is brought into contact with ammonia gas.
- the low molecular weight PTFE stabilizes or amidates the unstable terminal groups described above.
- a counterpart material such as ink, paint, cosmetics, etc. It is easy to conform and can improve dispersibility.
- the low-molecular-weight PTFE particles composed of low-molecular-weight PTFE are obtained by granulating the low-molecular-weight PTFE granules of the present invention from the low-molecular-weight PTFE particles as described above. As is evident from the fact that they are obtained, they have not been subjected to granulation.
- low molecular weight PTFE particles is a concept including not only particles in a solid powder but also particles dispersed as a dispersoid in a dispurgeon obtained by emulsion polymerization or the like.
- the low-molecular-weight polytetrafluoroethylene powder (hereinafter, referred to as “low-molecular-weight PTFE powder”) composed of the low-molecular-weight PTFE particles is an aggregate of low-molecular-weight PTFE particles that have not been subjected to granulation as described above.
- the low-molecular-weight PTFE particles are particles in a solid powder
- the solid-state powder itself is used
- the low-molecular-weight PTFE particles are particles dispersed in a disposable powder
- the low-molecular-weight PTFE powder preferably has an average particle diameter of 0.5 to 20 m.
- the average particle size of the low-molecular-weight PTFE powder is calculated by measuring the particle size distribution using a laser diffraction type particle size distribution measuring method and assuming that the average particle size is equal to the particle size corresponding to 50% of the obtained particle size distribution integration. Value.
- the low-molecular-weight PTFE granulated powder of the present invention is obtained from the low-molecular-weight PTFE particles by a granulation treatment.
- polytetrafluoroethylene having a number average molecular weight of 600,000 or less has been known to be difficult to fibrillate, and it is thought that granules are difficult to fibrillate, and low molecular weight PTFE particles are granulated. Although nothing has been known in the past, the present invention has realized the granulation of low molecular weight PTFE particles.
- the above-mentioned granulation treatment is performed by using low molecular weight PTFE particles, A step of mixing with a surfactant, a granulating medium, or the like; a step of removing the granulated material obtained when the granulating medium is used from the granulating medium; and, optionally, a step of drying.
- the granulation medium is a medium in which the low-molecular-weight PTFE particles are present for performing a granulation treatment.
- the granulation medium is usually water and / or an organic liquid, and is selected according to the granulation method used.
- the granulation method is not particularly limited, and examples thereof include an underwater granulation method, a warm water granulation method, an emulsification dispersion granulation method, an emulsified warm water granulation method, a solventless granulation method, and a dry solvent granulation method.
- an underwater granulation method the emulsified warm water granulation method and the emulsification dispersion granulation method, the granulation method in the below-described method for producing a low-molecular-weight PTFE granulated powder of the present invention can be used.
- the underwater granulation method is a method that does not use a surfactant.
- the water-insoluble liquid the same water-insoluble liquid that can be used in the below-described method for producing a low-molecular-weight granulated powder of PTFE according to the present invention can be used.
- the hot water granulation method is a method in which the temperature of the aqueous dispersion medium is raised to 30 to 100 ° C. with or without a water-insoluble liquid.
- the amount of the water-insoluble liquid is not more than 5% by mass of the low molecular weight aqueous PTFE dispersion.
- the emulsification-dispersion granulation method is a method which can be said to be a method in which the underwater granulation is performed in the presence of a surfactant, and the low-molecular-weight PTFE particles are dispersed in an aqueous dispersion medium to which the water-insoluble liquid is added. This method is carried out using an aqueous low-molecular-weight PTFE dispersion dispersed in the presence of water.
- the emulsified hot water granulation method comprises the steps of: producing an aqueous low molecular weight PTFE dispersion in which low molecular weight PTFE particles are dispersed in the presence of a surfactant in an aqueous dispersion medium to which the water-insoluble liquid is added or not added. This method is performed in a state where the temperature is raised to not less than 100 ° C and less than 100 ° C.
- the particles obtained by the underwater granulation method, the particles obtained by the emulsification dispersion granulation method, and the particles obtained by the emulsification hot water granulation method have higher apparent densities than the low-molecular-weight PTFE particles, which are the raw materials. Can be suppressed.
- the solventless granulation method is a method in which a surfactant aqueous solution is used in place of water or an organic solvent, and the surfactant aqueous solution is mixed with low-molecular-weight PTFE particles.
- the dry solvent granulation method is a method in which an organic solvent is used as a granulation medium without using a surfactant.
- the low molecular weight PTFE granulated powder of the present invention obtained by the above granulation treatment preferably has an average particle diameter of 1 to 1500 / xm.
- the low-molecular-weight PTFE granulated powder of the present invention also has excellent powder fluidity as compared with conventional low-molecular-weight PTFE particles, can suppress the adhesion of the powder to the wall of the hopper, and can improve the handleability.
- the low-molecular-weight PTFE granulated powder of the present invention has an average particle size that is 1 to 400 times the average particle size of the low-molecular-weight PTFE powder composed of low-molecular-weight PTFE particles, and has an apparent density of the low-molecular-weight PPTFE granulated powder. It is preferable that the apparent density of the low-molecular-weight PTFE powder composed of low-molecular-weight PTFE particles is 1.15 to 4 times (hereinafter referred to as “low-molecular-weight PTFE granulated powder (P)”).
- P low-molecular-weight PTFE granulated powder
- the low-molecular-weight PTFE granulated powder (P) Since the low-molecular-weight PTFE granulated powder (P) has an average particle diameter ratio within the above range, it does not easily flutter.
- the apparent density of the low molecular weight PTFE granulated powder (P) is more preferably 1.2 times or more, and more preferably 3 times or less, the apparent density of the low molecular weight PTFE powder.
- the condition that the apparent density is 1.15 to 4 times and the condition that the average particle diameter is 1 to 400 times can be compatible.
- the low-molecular-weight PTFE granulated powder (P) consists of sticky particles, which can prevent the powder from scattering and adhering to the hopper, and is designed not to be bulky during transportation or storage, and to have a small hopper and storage tank. be able to.
- the apparent density, JISK 689: low molecular weight PTFE granulated powder c present invention is a value obtained by measuring in conformity U This (P), the low molecular weight PT of the present invention to be described later Method for producing FE granulated powder (1) or method for producing low molecular weight PTFE granulated powder of the present invention (
- the low-molecular-weight PTFE granulated powder of the present invention has an average particle size of low-molecular-weight PT.
- Low molecular weight P T composed of F E particles 1 to 3 times the average particle size of the F E powder, and the low molecular weight PTFE granulated powder has a low angle of repose P T F
- a powder having a repose angle of 1.1 times or more (hereinafter, referred to as “low molecular weight PTFE granulated powder (Q)”) is preferable.
- the ratio of the angle of repose is within the above range, the low-molecular-weight PTFE granulated powder (Q) is composed of sticky particles, so that scattering of the powder is prevented, and when the raw material is put into the hopper, etc. Handling during work can be facilitated.
- the ratio of the angle of repose is, for example,
- molding powders obtained by granulating molding powder of polytetrafluoroethylene having a number average molecular weight of more than 600,000 have an average particle diameter of more than three times as described above. .
- both the condition that the angle of repose is 1.1 times or more of the low-molecular-weight PTFE powder and the condition that the average particle diameter is 1 to 3 times that of the low-molecular-weight PTFE powder are compatible. be able to.
- the low-molecular-weight PTFE granulated powder (Q) of the present invention is different from the low-molecular-weight PTFE powder in that, in addition to the above-mentioned average particle diameter ratio and angle of repose ratio, the low-molecular-weight PTFE powder of the present invention has an apparent density ratio.
- a powder having a ratio of 1.15 to 4 times is preferred.
- the low molecular weight PTFE granulated powder (Q) of the present invention can be easily obtained by the low molecular weight PTFE granulated powder manufacturing method (1) of the present invention described later.
- the low-molecular-weight PTFE granulated powder of the present invention has an average particle size of 10 to 400 times the average particle size of the low-molecular-weight PTFE powder composed of low-molecular-weight PTFE particles,
- the low-molecular-weight PTFE powder composed of low-molecular-weight PTFE particles preferably has a corner that is less than one time the low S angle (hereinafter, referred to as “low-molecular-weight PTFE granulated powder (R)”).
- the low-molecular-weight PTFE granulated powder (R) of the present invention is different from the low-molecular-weight PTFE powder in that the low-molecular-weight PTFE of the present invention has an apparent density ratio in addition to the ratio of the average particle diameter and the angle of repose described above.
- a powder having a ratio of 1.1 to 4 times is preferred.
- the low molecular weight PTFE granulated powder (R) of the present invention can be easily obtained by the below-described low molecular weight PTFE granulated powder manufacturing method (2) of the present invention.
- the low-molecular-weight PTFE granulated powder of the present invention has a specific surface area of less than 7 m 2 / g for the low-molecular-weight PTFE powder composed of the low-molecular-weight PTFE particles, and has a melting point measured by a flow tester method at 340 ° C. Viscosity may be 2500 Pa ⁇ s or less. D The melt viscosity may be, for example, 1000 Pa ⁇ s or less.
- the low-molecular-weight PTFE powder (A) the low-molecular-weight PTFE powder having a specific surface area and a melt viscosity within the above ranges.
- the low molecular weight PTFE powder (A) has a relatively small specific surface area and can reduce the adhesion of the powder to the flutter hopper.
- the preferred upper limit of the specific surface area of the low molecular weight PTFE powder (A) is e A more preferred upper limit is 5 mS / Zg, a preferred lower limit is lm 2 Zg, and a more preferred lower limit is 2 m 2 / g.
- the specific surface area is a value obtained by measurement using a surface analyzer according to the BET method.
- the number average molecular weight of the low molecular weight PTFE is about 100000 or less.
- the number average molecular weight can be, for example, 40,000 or less.
- the melt viscosity is a value measured by a flow tester method at 340 ° C. in accordance with AST] V1D1238.
- the low molecular weight PTFE powder (A) preferably has a melt viscosity within the above range, has a specific surface area within the above range, and is obtained by suspension polymerization.
- the low molecular weight PTFE powder (A) of the present invention By using the low molecular weight PTFE powder (P) of the present invention, the low molecular weight PTFE granulated powder (Q) of the present invention, and the low molecular weight PTFE granulated are also used. Powder (R) can be obtained.
- low molecular weight PTF E powder when simply referring to “low molecular weight PTF E powder” without adding (A) or (B) described below, the low molecular weight PTFE powder (A) and the low molecular weight PT FE powder (B) described later are used. And the low-molecular-weight PTFE powder that can include the low-molecular-weight PTFE powder (A) and the low-molecular-weight PTFE powder (B) without distinguishing between them.
- the low molecular weight PTFE granulated powder production method (1) of the present invention comprises producing the above low molecular weight PTFE granulated powder from low molecular weight PTFE particles by a granulation treatment.
- the low molecular weight polytetrafluoroethylene aqueous dispersion (hereinafter, referred to as “low molecular weight PTFE aqueous dispersion (a)”) in which the low molecular weight PTFE particles are dispersed in an aqueous dispersion medium in the presence of a surfactant. It is carried out at a temperature of 80 ° C or more and less than 10 ° C.
- the low-molecular-weight PTFE granulated powder production method (1) of the present invention includes the low-molecular-weight PTFE granulated powder (P) of the present invention and the low-molecular-weight PTFE Granular powder (Q) can be easily produced.
- the method of the granulation treatment in the method (1) for producing a low-molecular-weight PTFE granulated powder may be referred to as “emulsified hot-water granulation”.
- the aqueous dispersion medium in the low molecular weight PTFE aqueous dispersion (a) is water or a water-soluble organic solvent dissolved in water, and the low molecular weight PTFE particles are dispersed in the presence of a surfactant. It is a dispersion medium that can be used.
- the aqueous dispersion medium may contain an additive usually used in a granulation method using water.
- the aqueous dispersion medium in the dispurgeon is used as it is. Is also good.
- the low-molecular-weight PTFE aqueous dispersion (a) is a dispersion in which low-molecular-weight PTFE particles are dispersed in an aqueous dispersion medium in the presence of a surfactant, and further contains a water-insoluble liquid. Is also good.
- the low-molecular-weight aqueous PTFE dispersion (a) contains a water-insoluble liquid or does not contain a water-insoluble liquid.
- the water-insoluble liquid is 5% by mass or less of the low-molecular-weight PTFE aqueous dispersion. Preferably, there is. If it exceeds 5% by mass, it becomes difficult to produce the low molecular weight PTFE granulated powder (P) of the present invention (P).
- the low-molecular-weight PTFE aqueous dispersion is more preferably substantially free of a water-insoluble liquid, and even more preferably free of a water-insoluble liquid.
- the low-molecular-weight PTFE aqueous dispersion (a) includes the water-insoluble liquid as long as the contained water-insoluble liquid can wet the low-molecular-weight PTFE particles, and preferably does not contain the water-insoluble liquid. .
- the water-insoluble liquid is not particularly limited as long as it is a liquid at room temperature of about 30 ° C. and is insoluble in water, but the content of the low-molecular-weight PTFE granulated powder of the present invention is within the above range.
- (P) and the low-molecular-weight PTFE granulated powder (Q) of the present invention can be produced by, for example, hydrocarbons such as n-hexane, cyclohexane and heptane; dichloromethane, dichloroethane, and chloroform-form. N-methylpyrrolidone and other nitrogen-containing liquids; esters such as ethyl acetate; and carbonic esters such as ethylene carbonate.
- halogen-containing hydrocarbons are preferable, and dichloromethane is more preferable.
- the surfactant used in the method (1) for producing a low-molecular-weight PTFE granulated powder of the present invention is not particularly limited, but a nonionic surfactant is preferable, and among them, a polyoxyethylene polyoxypropylene glycol [PPG] -based surfactant is preferable. Activators are preferred.
- the surfactant of the PG type those having an average molecular weight of 1,000 to 20,000 are preferable.
- the surfactant is preferably at least 0.001% by mass / 0 of the low-molecular-weight PTFE particles, more preferably at most 0.5% by mass, and within the above range, 0.1% by mass. ° / and still more preferably 0 or less.
- the low-molecular-weight PTFE aqueous dispersion (a) is granulated while being stirred, and various conditions such as a stirring speed can be appropriately set. .
- the temperature of the low-molecular-weight PTFE aqueous dispersion (a) is such that the low-molecular-weight PTFE aqueous dispersion (a) does not contain a water-insoluble liquid.
- the temperature is preferably lower than 100 ° C. A more preferred lower limit is 85 ° C.
- the low molecular weight PTFE granulated powder production method (2) of the present invention is a low molecular weight PTFE granulated powder production method comprising producing the above low molecular weight PTFE granulated powder from low molecular weight PTFE particles by a granulation treatment.
- the low molecular weight PTFE particles are dispersed in an aqueous dispersion medium in the presence or absence of a surfactant in a low molecular weight polytetrafluoroethylene aqueous dispersion (hereinafter, referred to as “ The aqueous low-molecular-weight PTFE aqueous dispersion (b) ") is used.
- the low-molecular-weight aqueous PTFE aqueous dispersion (b) contains a water-insoluble liquid, and the surfactant is The content is 5 parts by mass or less per 100 parts by mass of the low-molecular-weight PTFE particles.
- the low-molecular-weight PTFE granulated powder production method (2) of the present invention includes the low-molecular-weight PTFE granulated powder (P) of the present invention and the low-molecular-weight PTFE Granular powder (R) can be easily produced.
- the aqueous dispersion medium in the low-molecular-weight PTFE aqueous dispersion (b) is water or a water-soluble organic solvent dissolved in water, and the low-molecular-weight PTFE particles are dispersed in the presence or absence of a surfactant. It is a dispersion medium that can be dispersed in the presence.
- the aqueous dispersion medium may contain an additive usually used in a granulation method using water.
- the aqueous dispersion medium may be the same as described above in the description of the low molecular weight PTFE aqueous dispersion (a).
- the low molecular weight PTFE aqueous dispersion (b) contains a water-insoluble liquid.
- the amount of the water-insoluble liquid is preferably 5% by mass or more of the low-molecular-weight aqueous PTFE dispersion (b).
- the content is less than 5% by mass, it becomes difficult to produce the low molecular weight PTFE granulated powder (P) of the present invention and the low molecular weight APT FE granulated powder (R) of the present invention.
- the water-insoluble liquid include the same ones as described for the low molecular weight PTFE aqueous dispersion (a).
- the above-mentioned underwater granulation method can be used as the granulation treatment.
- the granulation treatment in the case where a surfactant is present in the emulsion include the emulsification dispersion granulation method described above.
- the low molecular weight PTFE of the present invention is not particularly limited as the surfactant used in the method (2) for producing a granulated powder, and includes, for example, those described above for the low molecular weight PTFE aqueous dispersion (a). .
- the surfactant is present in an emulsification dispersion granulation method or the like, it is preferably 0.001 to 0.5 part by mass per 100 parts by mass of the low-molecular-weight PTFE particles, and more preferably the lower limit. Is 0.005 parts by mass, and a more preferred upper limit is 0.1 parts by mass.
- the water-insoluble liquid and the surfactant are as described above, and the proportion of the low-molecular-weight PTFE particles in the low-molecular-weight PTFE aqueous dispersion (b).
- the conditions such as the same are the same as in the method (1) for producing a low-molecular-weight PTFE granulated powder of the present invention, except for the granulation temperature, and can be appropriately set.
- the low molecular weight PTFE aqueous dispersion (b) does not need to be heated, and is preferably at most T ° C.
- T ° C means a temperature at which the amount of evaporation rapidly increases when a water-insoluble liquid is heated.
- Low molecular weight PT obtained from the method (2) for producing a low molecular weight PTFE granulated powder of the present invention
- the FE granulated powder is excellent in that it has a relatively large average particle diameter and a small angle of repose, so that it is not easily fluttered and is easy to handle.
- Low molecular weight PT obtained from the method (2) for producing a low molecular weight PTFE granulated powder of the present invention
- the FE granulated powder does not form particles, it can be prevented from mixing and contaminating other products existing in the environment where the above low molecular weight PTFE granulated powder is handled, with little adhesion to the hopper and easy handling. Is excellent.
- the low molecular weight p of the present invention The low-molecular-weight PTFE granulated powder obtained from the TFE granulated powder manufacturing method (2) can simultaneously prevent fluttering in the working environment, and thus can provide a favorable working environment.
- the low-molecular-weight PTFE granulated powder of the present invention can also be used for forming a granulated powder by aggregating a plurality of particles serving as basic units constituting the granulated powder.
- the low-molecular-weight PTFE granulated powder of the present invention can be used, for example, when charged with polybutylene terephthalate [PBT] and glass fiber into a single-screw extruder as disclosed in JP-A-59-140253.
- a molding powder of polytetrafluoroethylene having a number average molecular weight of more than 600,000 was obtained by performing the same granulation treatment as that for obtaining the low molecular weight PTFE granulated powder of the present invention.
- the molding powder granules are not easily decomposed to particles before granulation even in the step of mixing with other materials such as resin.
- the low molecular weight PTFE powder (B) of the present invention has a melt viscosity of 2500 Pa ⁇ s or less at 340 ° C. measured by a flow tester method.
- the low molecular weight PTFE powder (B) of the present invention can be used as a low molecular weight PTFE powder composed of the low molecular weight PTFE particles in the low molecular weight PTFE granulated powder of the present invention.
- the low-molecular-weight PTFE powder is included in these low-molecular-weight PTFE powders.
- the PTFE powders those having a melt viscosity within the above range.
- the low-molecular-weight PTFE powder (B) of the present invention preferably has a melt viscosity of 2000 Pa ⁇ s or less.
- the low molecular weight PTFE powder (B) of the present invention can be easily obtained by suspension polymerization.
- the suspension polymerization for obtaining the low-molecular-weight PTFE powder (B) of the present invention it is preferable to use the below-described method for producing a low-molecular-weight PTFE powder of the present invention.
- the low molecular weight PTFE powder (B) of the present invention preferably has a melt viscosity in the above range and a specific surface area of less than 7 m 2 / g.
- a more preferred upper limit of the specific surface area of the low molecular weight PTFE powder (B) of the present invention is 6 m 2 / g, a more preferred upper limit is 5 m 2 Zg, and a more preferred lower limit is lm 2 / g. A more preferred lower limit is 2 m 2 / g.
- the low molecular weight PTFE powder (B) of the present invention has a melt viscosity within the above range, has a specific surface area within the same range as the low molecular weight PTFE powder (A), and is suspended. It is preferably obtained by polymerization. By manufacturing using suspension polymerization, a low-molecular-weight PTFE powder having both a melt viscosity within the above range and a specific surface area within the above range can be easily obtained.
- the method for producing a low-molecular-weight polytetrafluoroethylene powder of the present invention (hereinafter referred to as a “method for producing a low-molecular-weight PTFE powder”) is the above-mentioned low-molecular-weight PTFE powder by suspension polymerization using a chain transfer agent. Is produced.
- the method for producing a low-molecular-weight PTFE powder of the present invention employs suspension polymerization, and is superior in that no coagulation is required, as compared with the case where it is produced by an emulsion polymerization method.
- the method for producing a low-molecular-weight PTFE powder of the present invention is suitable for producing the above-mentioned low-molecular-weight PTFE powder (B) of the present invention, but is also suitable for producing the above-mentioned low-molecular-weight PTFE powder (A).
- the chain transfer agent is the same as that described in the above description regarding the polymerization of low molecular weight polytetrafluoroethylene.
- the chain transfer agent is preferably used in an amount of 0.01 to 0.5 mol% of the gas phase at the start of the polymerization.
- the polymerization initiator used includes a persulfate or a sulfite and an organic peroxide.
- the polymerization initiator the above-mentioned “persulfate and sulfite” is referred to as group a, and the above-mentioned “organic peroxide” is referred to as group b, and at least one kind is selected from group a and group b. If present, other reagents having a polymerization initiating action may be used.
- the above-mentioned persulfates and the above-mentioned sulfites have a short half-life and act as a polymerization initiator from the start of polymerization, whereas the above-mentioned organic peroxide has a half-life.
- the period is relatively long, and it begins to act as a polymerization initiator more slowly than the above-mentioned persulfates and sulfites. Therefore, by combining both, the molecular weight distribution can be made small and sharp.
- the persulfate is not particularly limited, and examples thereof include ammonium persulfate and potassium persulfate.
- the sulfite is not particularly limited, and includes, for example, ammonium sulfite, potassium sulfite, and the like.
- the oxide is not particularly limited, and examples thereof include benzoyl peroxide, nicosolic acid peroxide, and niglutaric acid peroxide.
- liquid temperature is the temperature of the polymerization reaction liquid.
- the polymerization initiator to be used contains a persulfate or a sulfite and / or an organic peroxide, and a redox catalyst.
- a redox catalyst By including a redox catalyst, the reaction can proceed even at a low temperature such as 5 to 40 ° C.
- the above “persulfate or sulfite and / or organic peroxide and redox catalyst J are persulfate and redox catalyst, sulfite and redox catalyst, organic peroxide and redox catalyst, persulfate and organic peroxide.
- redox catalysts, and sulfites, organic peroxides, and redox catalysts may be used in any combination of at least two of the above-described persulfates, sulfites, organic peroxides, and redox catalysts. May be used.
- the redox catalyst is not particularly limited, and includes, for example, a mixture of metal carbonyl tetrachloride and a mixture of ferrous peroxide (II) compound.
- the low molecular weight polytetrafluoroethylene gelled powder of the present invention (hereinafter referred to as “low molecular weight PTFE gelled powder”) is obtained by mixing the above low molecular weight PTFE powder at a temperature of 250 ° C. or more and 340 ° C. It is obtained through a heat treatment of heating at less than.
- the lower limit of the preferable temperature is 300 ° C.
- the upper limit of the preferable temperature is the melting point of the low molecular weight PTFE, for example, 330 ° C.
- the low molecular weight PTF ⁇ gelled powder and the low molecular weight PTFE granulated gelled powder of the present invention are obtained by completely performing all the particles of the low molecular weight PTFE powder or all the particles of the low molecular weight PTFE granulated powder. And "semi-gelation" performed on some or some of the particles.
- the particles of the low-molecular-weight PTFE powder or the low-molecular-weight PTFE granulated powder are fused by point contact with each other to form a lump as a whole with a weak bonding force.
- the polymer chains increase in momentum and become entangled with each other within the individual particles of the low-molecular-weight PTFE powder or the low-molecular-weight PTFE granulated powder, so that the individual particles have a small size and a dense structure. And tend to shrink.
- the apparent density of the individual particles obtained by the above heat treatment is generally higher than that of the above-mentioned low molecular weight PTFE powder or the above low molecular weight PTFE granulated powder which is the powder before the heat treatment, so that the flutter of the powder is small.
- the lump obtained by the heat treatment may be subjected to a pulverization treatment to a desired size.
- the pulverization treatment is preferably performed so as to be separated into individual particles of the low molecular weight PTFE gelled powder or the low molecular weight PTFE granulated gelled powder.
- An additive containing the low-molecular-weight PTFE granulated powder, the low-molecular-weight PTFE-granulated gel powder, the low-molecular-weight PTFE powder, or the low-molecular-weight PTFE gel-containing powder can also be prepared.
- the additive may be the low molecular weight PTFE granulated powder itself, the low molecular weight PTFE granulated gel powder itself, the low molecular weight PTFE powder itself, or the low molecular weight PTFE gel powder itself, for example, However, a composite additive to which wax or the like is added in addition to these may be used. The composite additive obtained by adding the above wax is used, for example, for ink application.
- the above additives are mixed with various mating materials according to the purpose.
- the mating materials include polyoxybenzoyl polyester, polyimide, polyamide, polyamide imide, polyacetal, polycarbonate, and polyphenylene sulfide.
- non-adhesiveness of a copy roll is not particularly limited.
- non-adhesiveness of a copy roll is not particularly limited.
- non-adhesiveness of a copy roll is not particularly limited.
- non-adhesiveness of a copy roll is not particularly limited.
- non-adhesiveness of a copy roll is not particularly limited.
- Improvement of sliding properties used for the purpose of improving the slip properties of paints such as inks, varnishes and paints, and cosmetics such as foundations. be able to.
- applications to improve the texture of engineering plastic molded products such as furniture surface sheets, automobile dashboards, and home appliance covers, light load bearings, gears, cams, push-button buttons, projectors, camera parts, and sliding materials
- it is also suitable for applications such as improving the slipperiness and abrasion resistance of mechanical parts that generate mechanical friction such as, for example, enhancing oil repellency or water repellency of wax and the like, and processing aids for engineering
- the low molecular weight PTFE granulated powder, the low molecular weight PTFE granulated gelled powder, the low molecular weight PTFE powder, or the low molecular weight PTFE gelled powder can be used as a molding material for obtaining a molded product. is there.
- the molded article may contain a filler and / or oil.
- the filler is not particularly limited.
- engineering plastics such as polyoxybenzoyl polyester, polyimide, polyamide, polyamide imide, polyacetal, polycarbonate, and polyphenylene sulfide; carbon fiber; glass fiber; bronze powder; black 3 ⁇ 4 ⁇ powder; calcium carbonate; calcium sulfate; molybdenum disulfide; silicate minerals such as chlorite, talc, mica; metal oxides; BEST MODE FOR CARRYING OUT THE INVENTION
- TFE monomer was charged to a pressure in the tank of 0.5 MPa, and the temperature was raised to 85 ° C. When the temperature in the tank reached 85 ° C, TFE monomer was added again to adjust the pressure to 0.8 MPa. Heavy As soon as 250 ppm / H 2 O ammonium persulfate and 250 pm / H 2 O nicosuccinic acid peroxide were charged as aqueous initiators, the consumption of TFE monomer in the tank started.
- a low-molecular-weight PTFE powder was obtained in the same manner as in Polymerization Example 1 except that the amount of ethane was changed to 140 g.
- a low-molecular-weight PTFE powder was obtained in the same manner as in Polymerization Example 1 except that the amount of ethane was changed to 160 g.
- a low molecular weight PTF E powder was obtained in the same manner as in Polymerization Example 1 except that the amount of ethanol was changed to 200 g.
- a low-molecular-weight PTFE powder was obtained in the same manner as in Polymerization Example 1 except that the amount of the ethane was changed to 60 g.
- a low molecular weight PTFE powder was obtained in the same manner as in Polymerization Example 1 except that the amount of ethane charged was changed to 75 g. The following physical properties were evaluated for the obtained low-molecular-weight PTFE powder.
- the measurement was performed according to JISK 6891-5.3.
- the filtered solid was dried in a hot-air drying oven at 170 ° C. for 24 hours, and then cooled to room temperature to obtain a low-molecular-weight PTF E granulated powder (Step V).
- the obtained low-molecular-weight PTFE granulated powder was evaluated for the following physical properties in addition to the above apparent density and high-temperature volatility. '
- the average particle size of the powder having a size of 100 ⁇ m or more is determined according to ASTM D4894.
- International Publication was the ninth 9/1 2 9 9 by from 1 page 2 under the No. 6 Panfuretsuto in the same manner as described in line 6 to 1 on page 3 on whether we 7 line connexion measurement.
- the average particle size of the powder having a particle size of less than 100 ⁇ was determined according to the method described above in the polymerization examples. Angle of repose
- step III of Example 1 low-molecular-weight PTFE was prepared in the same manner as in Example 1, except that the amount of dichloromethane charged was changed to 300, 400, 450, and 500 ml, respectively. Granular powder was obtained.
- Example 6 Production of low molecular weight PTF E granulated powder by underwater granulation method
- a granulated powder of low molecular weight PTFE was obtained in the same manner as in Example 3 except that stirring was performed for 30 minutes in Step IV of Example 1.
- Example 7 Production of low molecular weight PTF E granulated powder by underwater granulation method
- step IV of Example 1 low-molecular-weight PTFE granulation was performed in the same manner as in Example 3, except that the temperature of the stirring tank was raised to 33 ° C over 15 minutes and then stirred for 25 minutes. A powder was obtained.
- Granulation Comparative Example 1 Production of low molecular weight PTFE granulated powder by underwater granulation method
- Step IV of Example 1 the low-molecular-weight PTFE granulated powder was produced in the same manner as in Example 3 except that the temperature of the stirring tank was raised to 36 to 15 minutes over 15 minutes and then stirred for 10 minutes.
- Example 8 Production of PTF E Granulated Powder with Low Molecular Weight by Emulsion Dispersion Granulation Method
- Step III of Example 1 except that a specific surfactant was added in an amount corresponding to 0.025% by mass of low-molecular-weight PTFE before charging dichloromethane in an amount of 400 ml.
- a low-molecular-weight PTFE granulated powder was obtained in the same manner as in Example 3.
- the term “specific surfactant” is a polyoxyethylene polyoxypropylene glycol-based non-ionic surfactant (trade name: Pronone # 104, manufactured by NOF Corporation; average molecular weight: 1670). .
- Example 9 Production of low molecular weight PTFE granulated powder by emulsion dispersion granulation method
- a low molecular weight PTFE granulated powder was obtained in the same manner as in Example 3 except that the above specific surfactant was charged in an amount corresponding to 0.010% by mass of low molecular weight PTFE.
- Example 10 Production of low molecular weight PTFE granulated powder by emulsification dispersion granulation method
- a low molecular weight PTFE granulated powder was obtained in the same manner as in Example 3, except that the above specific surfactant was charged in an amount corresponding to 0.005% by mass of low molecular weight PTFE.
- Example 11 Production of low molecular weight PTFE granulated powder by emulsified hot water granulation method
- Step 1 6.0 kg of ion-exchanged water was charged into a 15 L stirring tank equipped with a cone blade, and the temperature was adjusted to 20 to 22 ° C in advance (Step 1).
- 500 g of the low-molecular-weight PTFE used in Example 1 was charged into the stirring tank, and the cone blade was rotated at 1000 rpm and stirred (Step 2).
- the above-mentioned specific surfactant was added in an amount corresponding to 0.025% by mass based on the low molecular weight PTFE (Step 3).
- the temperature in the vessel was raised to 95 ° C while stirring (step 4).
- # 104 means the above-mentioned polyoxyethylenepolypropylenepropylene-dalicol-based nonionic surfactant (Pronon # 104).
- the low molecular weight PTFE granulated powder obtained by emulsified hot water granulation of Examples 11 to 14 has an average particle diameter of 1.15 to 1.35 times the raw material PTFE.
- the apparent density was 1.15 to 1.9 times, and the angle of repose was 1.1 to 1.3 times.
- the dried low-molecular-weight PTFE powder obtained in Polymerization Example 2 was spread on a stainless steel tray so as not to exceed a thickness of 20 mm, and was placed in a hot-air circulation electric furnace that had been heated to 250 ° C in advance. Heat treatment was performed for 30 minutes. Immediately after the elapse of 30 minutes, the tray was taken out of the chamber and allowed to cool to obtain a low molecular weight PTF E gelled powder.
- a gelling powder having a low molecular weight PTFE was obtained in the same manner as in Example 1, except that the temperature of the hot-air circulation type electric furnace was set at 300 ° C.
- a gelling powder having a low molecular weight PTFE was obtained in the same manner as in Example 1, except that the temperature of the hot-air circulation type electric furnace was set at 320 ° C.
- a low molecular weight PTF E gelled powder was obtained in the same manner as in Example 1, except that the temperature of the hot-air circulation electric furnace was set to 330 ° C.
- a gelling powder of low molecular weight PTFE was obtained in the same manner as in Example 1 for gelation except that the temperature of the hot-air circulation type electric furnace was set at 34 ° C.
- '' Gelation Comparative Example 2 'A low molecular weight PTFE gelled powder was obtained in the same manner as in Gelation Example 1 except that the temperature of the hot-air circulation electric furnace was set at 200 ° C.
- the obtained low-molecular weight PTFE gelled powder was subjected to the following physical property measurements in addition to the above-described measurements of the apparent density, average particle diameter, and melt viscosity. The area of the melting peak was measured using a differential scanning calorimeter (trade name: DSC_50, manufactured by Shimadzu Corporation).
- C low molecular weight PTFE powder production method of the present invention which has the constitution described hereinabove, which can be powder dance up to obtain a low molecular weight PTFE powder having an improved handling property without
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EP04716043A EP1605011B1 (en) | 2003-02-28 | 2004-03-01 | Granulated powder of low-molecular polytetrafluoro- ethylene and powder of low-molecular polytetrafluoro- ethylene and processes for producing both |
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US7803889B2 (en) * | 2003-02-28 | 2010-09-28 | Daikin Industries, Ltd. | Granulated powder of low-molecular polytetrafluoro-ethylene and powder of low-molecular polytetrafluoro-ethylene and processes for producing both |
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2004
- 2004-03-01 US US10/547,363 patent/US7803889B2/en active Active
- 2004-03-01 EP EP04716043A patent/EP1605011B1/en not_active Expired - Lifetime
- 2004-03-01 WO PCT/JP2004/002465 patent/WO2004076539A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0093404A2 (en) * | 1982-04-30 | 1983-11-09 | Daikin Kogyo Co., Ltd. | Process for preparing tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer |
EP1065223A1 (en) * | 1998-02-27 | 2001-01-03 | Asahi Glass Company Ltd. | Process for producing aqueous dispersion containing polytetrafluoroethylene |
Non-Patent Citations (1)
Title |
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See also references of EP1605011A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7803889B2 (en) * | 2003-02-28 | 2010-09-28 | Daikin Industries, Ltd. | Granulated powder of low-molecular polytetrafluoro-ethylene and powder of low-molecular polytetrafluoro-ethylene and processes for producing both |
Also Published As
Publication number | Publication date |
---|---|
EP1605011A4 (en) | 2007-10-03 |
US7803889B2 (en) | 2010-09-28 |
EP1605011A1 (en) | 2005-12-14 |
US20060252898A1 (en) | 2006-11-09 |
EP1605011B1 (en) | 2013-01-23 |
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