EP2962313A1 - Electrically insulating composite material and electrical device comprising the same - Google Patents
Electrically insulating composite material and electrical device comprising the sameInfo
- Publication number
- EP2962313A1 EP2962313A1 EP13876550.8A EP13876550A EP2962313A1 EP 2962313 A1 EP2962313 A1 EP 2962313A1 EP 13876550 A EP13876550 A EP 13876550A EP 2962313 A1 EP2962313 A1 EP 2962313A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- composite material
- electrically insulating
- insulating composite
- fibrid
- 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- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
- D21J1/16—Special fibreboard
- D21J1/20—Insulating board
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/42—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes polyesters; polyethers; polyacetals
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/47—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes fibre-reinforced plastics, e.g. glass-reinforced plastics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
Definitions
- the present invention relates to an electrically insulating composite material in the form of a paper or a pressboard, wherein the electrically insulating composite material is obtained through post-treating by irradiation treatment.
- Insulation of oil-filled distribution and power transformers may be made from cellulose, polymer paper and pressboard.
- the cellulose papers or pressboards are mainly used in transformers with relatively lower thermal stability requirements, and polymer papers or pressboards are mainly for transformers with relatively higher thermal stability requirements.
- Nomex from Dupont and Thermal shield from 3M are typical commercially available polymer papers or pressboards.
- cellulose papers or pressboards are more extensively used than polymer ones. The major reason is that the cost of cellulose paper and pressboard is much lower than those made of polymer.
- the use of cellulose papers or pressboards at high temperature is limited by the low thermal stability of cellulosic materials.
- the paper or pressboard it is unsatisfactory to use the polymer paper or pressboard due to its relatively high cost. Furthermore, for some uses, it is necessary that the paper or pressboard not only have a suitably high thermal stability, but also possess enhanced mechanical property, so that the paper or the pressboard can provide better electrical insulation performance.
- Irradiation treatment such as electron beam irradiation treatment, gamma irradiation treatment and x-ray irradiation treatment, is an effective method to increase the crosslinking density of some polymer materials, thus enhance the mechanical property of the polymers. Few works have been reported related to irradiation treatment in the application of electrically insulating paper or pressboard until now.
- US 6 824 728 B2 relates to a process for crosslinking polyacrylate compositions, wherein, by selective irradiation of the pressure- sensitive adhesive composition with electron beams, the polymer is cured only in certain structures and, as a result, structured pressure- sensitive adhesive compositions can be prepared.
- US 3 707 692 discloses a method of increasing the dimensional stability of cellulosic material by impregnating the cellulose with a composition including a cellulose swelling agent and a compound capable of crosslinking with the cellulose molecules.
- the crosslinking takes place at elevated temperatures in the absence of an acidic catalyst and the crosslinked cellulosic materials are useful as insulators in electrical apparatus.
- an electrically insulating composite material in the form of a paper or a pressboard is provided, wherein the electrically insulating composite material is obtained through post-treating by irradiation treatment.
- One aspect of the present invention relates to an irradiation treatment for post-treating, wherein the irradiation treatment for post-treating is electron beam irradiation treatment, gamma irradiation treatment, x-ray irradiation treatment or combinations thereof.
- the electron beam irradiation, gamma irradiation or x-ray irradiation is under ambient air atmosphere or with the injection of inert gas.
- the dose for the electron beam irradiation, gamma irradiation or x-ray irradiation is from 30 kGy to 300kGy and preferably 50 kGy to 200 kGy.
- the said fiber comprises at least one of the following fibers: polyethylene terephthalate fiber, polyethylene naphthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyacrylonitrile fiber, poly (metaphenylene isophthamide) fiber, poly(paraphenylene terephthalamide) fiber, polysulfonamide fiber, polyphenylene sulphide fiber, polyphenylene oxide fiber, polyethersulfone fiber, polyetheretherketone fiber, polyetherimide fiber, and cellulose fiber.
- the said fibrid comprises at least one of the following fibrids: polyacrylonitrile fibrid, polyethylene terephthalate fibrid, polyethylene naphthalate fibrid, polytrimethylene terephthalate fibrid, polybutylene terephthalate fibrid, poly (metaphenylene isophthamide) fibrid, and polysulfonamide fibrid.
- the fiber in the electrically insulating composite material is present in an amount of 5 wt% to 95 wt% and the fibrid is present in an amount of 5 wt% to 95 wt%, base on the total weight of the electrically insulating composite material.
- the electrically insulating composite material is in the form of a paper or a pressboard.
- Another aspect of the present invention relates to an electrical device comprising the above electrically insulating composite material, such as an electrical transformer or an electrical motor.
- the inventors have found unexpectedly that, by post-treated with electron beam irradiation gamma irradiation or x-ray irradiation, it is possible to provide an electrical device, especially high voltage insulating device, with improved mechanical property and thermal stability.
- the electrically insulation composite material displays significant different performance after such irradiation treatment.
- the electrically insulation composite material composed by polyacrylonitrile fibrid and polyethylene terephthalate fiber Example 1
- the 5% decomposition temperature is increased from 323 °C to 339 °C
- the tensile strength is increased from about 100 MPa to about 115 MPa
- the compressibility is lowered from 3.5% to 3.1% after electron beam irradiation treatment.
- Figure 1 is a schematic flow chart of an embodiment of a method according to the present invention.
- an electrically insulating composite material in the form of a paper or a pressboard is provided, wherein the electrically insulating composite material is obtained through post-treating by irradiation treatment.
- the pressboard according to the present invention has a thickness of higher than 0.9 mm. More preferably, the thickness of the pressboard is 1-12 mm, and most preferably 1-8 mm.
- a paper of the present invention has a thickness of less than 0.9 mm, preferably less than 0.8 mm, and more preferably is between 0.05 to 0.5 mm.
- Crosslinking is the term used to denote the reaction in which a large number of linear or branched macromolecules, which initially are still soluble, become linked together to form three-dimensional polymeric networks (crosslinked polymers, network polymers) which are insoluble and now only swellable. Crosslinking is possible as a result of the formation of covalent and noncovalent (coordinative, ionic physical, saltlike) bonds. Crosslinking can be carried out during the actual construction of the macromolecules and/or by reaction on performed (pre)polymers which generally contain functional groups.
- the crosslinking of the polymers can be initiated by heat or irradiation. Due to the relatively poor thermal stability of some electrically insulation composite material, irradiation treatment should be a better method to conduct the crosslinking. Irradiation treatments usually include ultraviolet light (UV) irradiation, electron beam (EB) irradiation, gamma irradiation and x-ray irradiation treatment.
- UV crosslinking is a very simple process requiring only a simple coating used with a few low-pressure Hg lamps. UV crosslinking functions very well for polymer compositions with low film thickness.
- the EB, gamma irradiation and x-ray irradiation technologies are more expensive in terms of apparatus but tolerate the crosslinking of greater film thicknesses and faster web speeds.
- One aspect of the present invention relates to an irradiation treatment for post-treating, wherein the irradiation treatment for post-treating is electron beam irradiation treatment, gamma irradiation treatment, x-ray irradiation treatment or combinations thereof.
- the electron beam irradiation, gamma irradiation or x-ray irradiation is under ambient air atmosphere or with the injection of inert gas.
- the post-treating by electron beam irradiation, gamma irradiation or x-ray irradiation could increases the crosslinking density in the electrically insulation composite material and also could induce the material degradation, with appropriate irradiation post treatment to balance the crosslinking reaction and degradation reaction, we can enhance the thermal stability and mechanical property of the electrically insulation composite material.
- the thermal stability of the electrically insulation composite material is evaluated by 5% decomposition temperature, which is known to the skilled in the art and is commonly used in this field.
- the volume increase of the pressboard after EB irradiation is only 35%, much lower than the corresponding pressboard without EB irradiation (50%), indicating the increased crosslinking density.
- the 5% decomposition temperature of the pressboard is increased from 323 °C to 339 °C
- the tensile strength of the pressboard is increased from about 100 MPa to about 115 MPa and the compressibility of the pressboard is lowered from 3.5% to 3.1%, implying the improved mechanical property.
- the composite material is composed of fiber and fibrid.
- the fiber may be a polymer fiber.
- the polymer fiber for paper and pressboard preparation is a short fiber which is generally made of normal continuous fiber with regular diameter.
- the short polymer fiber could be treated by further beating to develop their sheetmaking properties.
- the said fibrid may be a polymer fibrid.
- the polymer fibrid, a type of fibrous particle used for binding, is with irregular shape and made from polymer solution.
- the said fiber comprises at least one of the following fibers: polyethylene terephthalate fiber, polyethylene naphthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyacrylonitrile fiber, poly (metaphenylene isophthamide) fiber, poly(paraphenylene terephthalamide) fiber, polysulfonamide fiber, polyphenylene sulphide fiber, polyphenylene oxide fiber, polyethersulfone fiber, polyetheretherketone fiber, polyetherimide fiber, cellulose fiber or the combinations thereof.
- the said fibrid comprises at least one of the following fib rids: polyacrylonitrile fibrid, polyethylene terephthalate fibrid, polyethylene naphthalate fibrid, polytrimethylene terephthalate fibrid, polybutylene terephthalate fibrid, poly (metaphenylene isophthamide) fibrid, polysulfonamide fibrid, or combinations thereof.
- the fiber in the electrically insulating composite material is present in an amount of 5 wt to 95 wt and preferably 20 wt to 60 wt .
- the fibrid is present in an amount of 5 wt to 95 wt , and preferably 40 wt to 80 wt , based on the total weight of the electrically insulating composite material.
- the suitable dose for the electron beam irradiation, gamma irradiation and x-ray irradiation is from 30 kGy to 300 kGy.
- the dose for EB, gamma irradiation or x-ray irradiation is preferred to be 50 kGy to 200 kGy.
- the preferred dose for EB irradiation is about 200 kGy (Example 2). More particularly, for the pressboard made from polyacrylonitrile fibrid and cellulose fiber, the preferred dose for EB irradiation is about 100 kGy (Example 4).
- the composite material is electrically insulating and is suitable for use as insulation material in an electrical device.
- the composite material may be, for example, used as electrical insulation in an electrical device, such as in a power transformer, whereby the composite material may be a high voltage insulation material.
- the electrically insulating composite material may have especially beneficial electrically insulating properties in an oily environment.
- the electrically insulating composite material may be at least partly soaked in oil.
- the present invention further provides an electrical device comprising the electrically insulating composite material according to the present invention.
- the electrical device may be any electrical device which comprises electrical insulation, e.g. an electrical transformer or a conductor of electricity or an electrical motor, which may especially benefit from the composite material, such as with improved mechanical properties, less time is needed for insulation height adjustment during transformer fabrication and the total insulation thickness can be reduced.
- the electrical device according to the present invention is an electrical transformer.
- the electrically insulating composite material may be in the form of a paper, spacer, barrier, strip or press ring for insulation in or of an electrical device, such as a conductor of electricity, an electrical transformer.
- the electrically insulating composite material has electrically insulating properties which may be useful in any electrical device, such as for insulating an electricity conduit, but the electrically insulating composite material may be especially advantageous in an oily environment, such as in an electrical transformer.
- the electrically insulating composite material may be used for making electrically insulating spacers in a transformer winding.
- An improved electrical device is obtained by using the electrically insulating composite material in accordance with the present invention.
- the electrically insulation composite material displays improved mechanical properties, such as an improved compressibility.
- Fig 1 is a schematic flow chart of an embodiment of a method 1 which is the-state-of-the-art method for insulation paper and pressboard preparation. Fibrids are provided, see 2, and fibers are also provided, see 3. The fibrids and fibers are then mixed with each other, see 4. A paper press, multi-daylight hot press of the like, is then used for pressing the mixture to provide a pressboard or a presspaper or the like of the composite material discussed herein, see 5. The pressing also comprises heating, see 6, and drying the mixture, see 7, as well as pressing the mixture to the pressboard, see 8. The pressboard was then cooled, see 9. The cooled pressboard may then be cut into desired insulation parts, for example, for use in a transformer or any other electrical device. For instance, a spacer, barrier, strip or press ring for insulation of an electrical transformer can be produced from the composite material from this invention.
- Example 1 An electrically insulation composite material in the form of a paper or a pressboard, which is first produced according to the-state-of-the-art method as shown in Fig 1, is obtained through post-treating by irradiation treatment. The properties of the electrically insulation composite material are tested according to the IEC (International Electrotechnical Commission) standard 60641-2.
- IEC International Electrotechnical Commission
- a pressboard was made according to the process in Fig 1.
- the solid materials used in the making of this pressboard were 60 weight percent of polyacrylonitrile fibrid (Shanghai Labon Technical Fiber Co., Ltd)and 40 weight percent of polyethylene terephthalate fiber (Woongjin Chemical Co., Ltd).
- This pressboard had a basic weight of 2420 g/m , a thickness of 2 mm and a density of 1.21 g/cm 3 .
- An electron beam source of 1.5 MeV was used for the post-treating of the pressboard and the irradiation was carried out at room temperature under ambient air.
- the pressboard samples were placed in an open steel tray on a conveyer band which passed the electron beam scan horn with a speed of 3m/min and in 6 turns.
- the specimens were immersed in lOOmL of m-cresol at 70°C for 24 hours.
- the specimens were removed from the solvent thereafter, shortly cooled to room temperature and the dimensions were remeasured.
- the increase in volume after swelling of the pressboard without irradiation treatment is about 50% and that of the pressboard with irradiation treatment is about 35%.
- the 5% decomposition temperature of the untreated pressboard determined by thermogravimetry analyzer (TGA) in air atmosphere is about 323°C and that of the treated pressboard is 339 °C.
- the tensile strength of the untreated pressboard is about 100 MPa and that of the treated pressboard is about 115MPa; the compressibility of the untreated pressboard is about 3.5% that of the treated pressboard is about 3.1%.
- Example 2 A pressboard was made according to the process in Fig 1.
- the solid materials used in the making of this pressboard were 60 weight percent of polyethylene terephthalate fibrid (Shanghai Labon Technical Fiber Co., Ltd) and 40 weight percent of polyethylene terephthalate fiber.
- This pressboard had a basic weight of 1160 g/m , a thickness of 1 mm and a density of 1.16 g/cm 3 .
- An electron beam source of 1.5 MeV was used for the post-treating of the pressboard and the irradiation was carried out at room temperature under ambient air.
- the pressboard samples were place in an open steel tray on a conveyer band which passed the electron beam scan horn with a speed of 3m/min and in 8 turns.
- the pressboard samples were irradiated with 25 kGy and total dose of 200 kGy was applied on the samples.
- 3 specimens per pressboard with and without irradiation treatment of approximately 25*15*lmm were cut and measured with an accuracy of 0.05mm.
- the specimens were immersed in lOOmL of m-cresol at 70°C for 24 hours.
- the specimens were removed from the solvent thereafter, shortly cooled to room temperature and the dimensions were remeasured.
- the increase in volume after swelling of the pressboard without irradiation treatment is about 48% and that of the pressboard with irradiation treatment is about 32%.
- the 5% decomposition temperature of the untreated pressboard determined by thermogravimetry analyzer (TGA) in air atmosphere is about 360°C and that of the treated pressboard is 377 °C.
- the tensile strength of the untreated pressboard is about 80 MPa and that of the treated pressboard is about 90 MPa; the compressibility of the untreated pressboard is about 3.4% that of the treated pressboard is about 3.0%.
- Example 3 A pressboard was made according to the process in Fig 1.
- the solid materials used in the making of this pressboard were 60 weight percent of polyacrylonitrile fibrid, 10 weight percent of poly (metaphenylene isophthamide) fiber (Yantai Tayho Advanced Materials Co., Ltd) and
- This pressboard had a basic weight of 1120 g/m , a thickness of 1 mm and a density of 1.12 g/cm 3 .
- a gamma irradiation source of 1.5 MeV was used for the post-treating of the pressboard and the irradiation was carried out at room temperature under ambient air.
- the pressboard samples were placed in an open steel tray on a conveyer band which passed the gamma irradiation scan horn with a speed of 2m/min and in 8 turns. In each turn the pressboard samples were irradiated with 25 kGy and total dose of 200 kGy was applied on the samples.
- a pressboard was made according to the process in Fig 1.
- the solid materials used in the making of this pressboard were 20 weight percent of polyacrylonitrile fibrid and 80 weight percent of cellulose fiber.
- This pressboard had a basic weight of 1140 g/m , a thickness of 1 mm and a density of 1.14 g/cm .
- An electron beam source of 1.5 MeV was used for the post-treating of the pressboard and the irradiation was carried out at room temperature under ambient air.
- the pressboard samples were placed in an open steel tray on a conveyer band which passed the electron beam scan horn with a speed of 3m/min and in 4 turns. In each turn the pressboard samples were irradiated with 25 kGy and total dose of 100 kGy was applied on the samples.
- the 5% decomposition temperature of the untreated pressboard determined by
- thermogravimetry analyzer in air atmosphere is about 316°C and that of the treated pressboard is 325 °C.
- the tensile strength of the untreated pressboard is about 105 MPa and that of the treated pressboard is about 115MPa; the compressibility of the untreated pressboard is about 4.2% that of the treated pressboard is about 3.9%.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2013072081 | 2013-03-01 | ||
PCT/CN2013/075262 WO2014131245A1 (en) | 2013-03-01 | 2013-05-07 | Electrically insulating composite material and electrical device comprising the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2962313A1 true EP2962313A1 (en) | 2016-01-06 |
EP2962313A4 EP2962313A4 (en) | 2016-10-12 |
Family
ID=51427502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13876550.8A Withdrawn EP2962313A4 (en) | 2013-03-01 | 2013-05-07 | Electrically insulating composite material and electrical device comprising the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150354144A1 (en) |
EP (1) | EP2962313A4 (en) |
WO (1) | WO2014131245A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3012282B1 (en) * | 2014-10-20 | 2020-10-07 | ABB Power Grids Switzerland AG | Pressboard |
CN106835811A (en) * | 2017-03-06 | 2017-06-13 | 陕西科技大学 | A kind of polyamine epichlorohydrin resin self-crosslinking polyester fiber paper and preparation method thereof |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3707692A (en) * | 1969-03-10 | 1972-12-26 | Mc Graw Edison Co | Method of treating cellulosic material to improve the usefulness thereof as an insulator in electrical apparatus |
JPS4926081B1 (en) * | 1970-11-05 | 1974-07-05 | ||
JPS4822842B1 (en) * | 1970-12-24 | 1973-07-09 | ||
JPS573174B2 (en) * | 1974-01-30 | 1982-01-20 | ||
EP0019113B1 (en) * | 1979-05-09 | 1983-04-13 | Teijin Limited | Aromatic polyamide paper-like sheet and processes for producing the same |
DE10008844A1 (en) * | 2000-02-25 | 2001-09-06 | Beiersdorf Ag | Process for the crosslinking of polyacrylates by electron beams |
WO2006101084A1 (en) * | 2005-03-23 | 2006-09-28 | Bridgestone Corporation | Carbon fiber and processes for (continuous) production thereof, and catalyst structures, electrodes for solid polymer fuel cells, and solid polymer fuel cells, made by using the carbon fiber |
US20100272920A1 (en) * | 2006-01-12 | 2010-10-28 | John Lyndon Garnett | Radiation Curable System |
EP2037039A1 (en) * | 2007-09-12 | 2009-03-18 | Teijin Aramid B.V. | Paper comprising polybenzazole or precursor thereof |
CN101386218B (en) * | 2007-09-14 | 2011-06-22 | 四川得阳化学有限公司 | Manufacture method of polyphenyl thioether fiber composite laminate sheet |
US7867358B2 (en) * | 2008-04-30 | 2011-01-11 | Xyleco, Inc. | Paper products and methods and systems for manufacturing such products |
PL2488918T3 (en) * | 2009-10-14 | 2018-11-30 | Xyleco, Inc. | Marking paper products |
WO2012138960A1 (en) * | 2011-04-07 | 2012-10-11 | Board Of Regents, The University Of Texas System | Photopolymerizable compositions for solventless fiber spinning |
US20140178661A1 (en) * | 2012-12-21 | 2014-06-26 | Sabic Innovative Plastics Ip B.V. | Electrical insulation paper, methods of manufacture, and articles manufactured therefrom |
-
2013
- 2013-05-07 WO PCT/CN2013/075262 patent/WO2014131245A1/en active Application Filing
- 2013-05-07 EP EP13876550.8A patent/EP2962313A4/en not_active Withdrawn
- 2013-05-07 US US14/759,427 patent/US20150354144A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20150354144A1 (en) | 2015-12-10 |
EP2962313A4 (en) | 2016-10-12 |
WO2014131245A1 (en) | 2014-09-04 |
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