WO2003072267A2 - Articles elastomeres recouverts et leur procede de production - Google Patents

Articles elastomeres recouverts et leur procede de production Download PDF

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Publication number
WO2003072267A2
WO2003072267A2 PCT/US2003/005554 US0305554W WO03072267A2 WO 2003072267 A2 WO2003072267 A2 WO 2003072267A2 US 0305554 W US0305554 W US 0305554W WO 03072267 A2 WO03072267 A2 WO 03072267A2
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WO
WIPO (PCT)
Prior art keywords
compressible layer
microspheres
elastomer
coated article
layer
Prior art date
Application number
PCT/US2003/005554
Other languages
English (en)
Other versions
WO2003072267A3 (fr
Inventor
Chris F. Delrosario
Ronald W. Brush
Original Assignee
Ames Rubber Corporation
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 Ames Rubber Corporation filed Critical Ames Rubber Corporation
Priority to AU2003228220A priority Critical patent/AU2003228220A1/en
Publication of WO2003072267A2 publication Critical patent/WO2003072267A2/fr
Publication of WO2003072267A3 publication Critical patent/WO2003072267A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/586—No clear coat specified each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2201/00—Polymeric substrate or laminate
    • B05D2201/02—Polymeric substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2602/00—Organic fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/02—Top layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/04—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/06—Backcoats; Back layers; Bottom layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Definitions

  • This invention relates to elastomeric coated articles and a method of manufacture. More particularly, it relates to coated articles having a compressible layer including resin microspheres disposed on a substantially rigid substrate that can be coated with a top layer for use in lithographic printing and toner fusing applications.
  • the finished articles can be in the form of a belt, roller and a blanket.
  • the printing process involves permanently affixing an image to a print media.
  • a printer, copier or multipurpose machine containing a fuser roll or belt serves the purpose of permanently fixing the toner to the desired medium.
  • ink is transferred from a printing plate to a printing blanket and finally to the print medium where it is permanently affixed.
  • an offset printing process typically includes a fountain roll that picks up ink from an ink fountain and transfers the ink to distribution rolls.
  • the distribution rolls transfer the ink to a printing plate on a plate cylinder.
  • a second blanket cylinder is disposed on the opposed second surface of the print medium for printing the second side.
  • the plate cylinders carry a printing blanket typically constructed in a multilayer fashion including a tubular metal sleeve, a reinforcing member, a compressible layer and a flexible top layer that contacts the printing plate at the nip between the plate cylinder and the printing blanket.
  • the medium or web to be printed travels between the cylinder blanket and the impression cylinder. Ink applied to the surface of the printing plates mounted on the plate cylinder is transferred to the surface of the printing blanket and then transferred to the medium as it goes through the nip between the cylinders.
  • the ability of maintaining image quality is known to be influenced not only by the transfer efficiency from one surface to another, but also by the compressibility properties of the printing blanket.
  • the subject of blanket compressibility and the use of resin microspheres or microballoons is well documented in the art and discussed by Larson in U.S. Patent No. 4,042,743 issued on August 16, 1977 and to Vrotacoe, et al. in U.S. Patent No. 5,553,541 issued on September 10, 1996. The contents of both patents are incorporated herein by reference.
  • the system In the process of permanently fixing xerographic or digitally produced images, the system generally uses what is called a fusing roller or a fusing belt.
  • the images are transferred from a photo-receptor to a print medium where the medium containing the image is subjected to heat and pressure as it goes through the nip.
  • the integrity of the image quality is influenced by the ability of the fuser member to release the toner but also by the ability of the fuser member not to distort the image as it goes through the nip. It is commonly known in the art that fuser member possessing certain degree of compliance provides superior quality images.
  • microcells are commercially available from Akso Nobel Corporation under the trade name of Expancel.
  • the thickness of the compressible layer is determined by the amount of elastomer coating of threads with different thicknesses.
  • the threads acting as a carrier for the compressible microcellular rubber compound after it is converted into a solvated solution provides a partially non-elastic layer of different mechanical characteristic than the remaining portion of the layers in the finished blanket.
  • thread as a carrier for the rubber and microspheres is convenient, but is expensive and fabrication time extensive. Moreover, the presence of threads close to the surface layer of the printing blanket yields print imperfections due to uneven pressure across the face of the blanket.
  • Another fabrication technique well known in the art is spreading a solvated compressible layer material onto a continuous sheet of a reinforcing member. While this method provides an economical means of fabricating a blanket, the resultant blanket contains a seam and in modern printing machines a seam line presents an undesirable characteristic.
  • U.S. Patent No. 5,553,541 describes a method of preparing gapless tubular printing blankets.
  • tubular printing blankets are prepared by priming the outer surface of a metal sleeve.
  • a first compressible layer is then applied to an adhesive on the primed backing layer by encapsulating thread in a compressible composite rubber cement with resin microspheres and by winding the encapsulated thread in a helix around the primed backing layer.
  • the thread is encapsulated by pulling it through the rubber cement composition.
  • An additional quantity of the rubber cement is then applied over the wound thread as needed to define the desired thickness of the first compressible layer.
  • a second compressible layer may be formed in the same manner.
  • the construction described may include a non-extensible top layer formed by encapsulating thread in an elastomeric material without microcells and then wound in the thread in a helix around the compressible layer.
  • the encapsulated thread is preferably impregnated thoroughly with an elastomeric material and wound in tension so as to apply compressive preload to the compressible layer.
  • a sheet of uncured print rubber about 0.04 inches thick is wrapped over the outside of the incompressible layer to form the printing layer.
  • the compressible layers can be applied in a measured thickness by extrusion or flow coating and using a knife to adjust the thickness.
  • the '541 Patent also suggests forming the compressible layers by metering or spraying the rubber material, but without providing any details.
  • the elastomer in the compressible layer includes a plurality of resin microballoons which impart the desired cellularity and compressibility to the printing blanket.
  • fuser rolls including a compressible layer disposed on a rigid metal insert by a wide variety of means, including extrusion or electrostatic spraying of elastomers, such as silicone rubber.
  • Electrostatic spraying of elastomeric materials require that the spray solution, not only be of suitable viscosity, but also of a certain degree of electrical conductivity. Where the spray materials themselves do not possess inherent electrical conductivity, it is common practice to use highly polar solvents, such as methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate and the like.
  • a method of electrostatic spraying of elastomeric materials including resin microspheres is provided.
  • the articles are prepared by conveying a succession of vertically-oriented cylindrical substrate along an endless path of movement about a vertical axis with an electrostatic spray disk rotating about and vertically displaced along the axis.
  • Elastomeric material such as silicone and nitrile rubbers, or urethanes are dissolved in a suitable polar solvent that will not physically degrade the resin microspheres.
  • the solvent for the compressible layer material may be any organic liquid in which the elastomer dissolves, such a ketone or mixture of ketones that do not degrade the resin microspheres.
  • a ketone solvent is selected to solvate the elastomer
  • other organic liquids such as low molecular weight alcohols, esters and aliphatic and aromatic compounds may be included so long as the ketone mixture includes at least about 50 weight percent ketones having at least six carbon atoms and yielding a sprayable composition having a viscosity of from about 50 to 150 centistokes and a specific gravity of between 0.70 to 1.0.
  • a preferred solvent for the elastomer and resin microspheres is between about 10 to 25 weight percent methyl amyl ketone and between about 75 to 90 weight percent methyl isobutyl ketone. Microspheres are added to the solution prior to spraying.
  • the electrical charge applied during electrostatic spraying is generally of low amperage ranging from about 0.5 to 2.0 milliamps with potential as high as 100,000 volts.
  • the rotating disk is rotated between about 500 to 8,000 revolutions per minute.
  • a thickness of from about 10 to about 40 microns per pass after drying and curing is applied as the compressible layer may be ground to a desired thickness such as between about 250 to 1500 microns.
  • a top surface layer is then applied and finished. Accordingly, it is an object of the invention to provide an improved method for electrostatic spray coating of elastomeric materials onto a rigid substrate.
  • Another object of the invention is to provide an improved method for electrostatic spray coating of elastomeric materials including resin microspheres onto a rigid substrate.
  • a further object of the invention is to provide an improved solvent suitable for spray coating elastomeric materials including resin microspheres onto rigid substrates.
  • the invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others, and the composition possessing the features, properties and the relation of components and the product which possesses the characteristics, properties and relation of constituents, all will be exemplified in the detailed disclosure hereinafter set forth, and the scope of the invention will be indicated in the claims.
  • Microballoons 16 are preferably those known by the trademark Expancel 461 DE-40-D60 from Expancel of Sundsvall, Sweden. Such microballoons have a shell consisting basically of a copolymer of vinylidene chloride and acrylonitrile, and contain gaseous isobutane. Other microspheres possessing the desired properties of compressibility can also be employed, including those disclosed in U.S. Patent No. 4,770,928.
  • nitrile rubber composition set forth above is then solvated in a suitable solvent.
  • Typical electrostatic spray solvents based on methyl ethyl ketone and the like are not suitable due to chemical attack of the resin microspheres.
  • a solvent including higher molecular weight and higher boiling ketones have been found to be suitable.
  • a typical solvent solution may include between about 10 to 20 weight percent methyl amyl ketone and between about 60 to 90 weight percent methyl isobutyl ketone, based on the total weight of the composition to be sprayed.
  • the exact composition depends on the particular elastomer selected and the amount of microballoons to be included in the compressible layer.
  • the solids content may vary from about 7 to 25 weight per cent.
  • Electrostatic spraying in accordance with the invention utilizes a rotating disc arrangement commonly used in spraying of charged paint particles as described in U.S. Patent No. 2,754,226, the contents of which are incorporated herein by reference.
  • a conveyor 26 includes an endless loop of connected links driven by a motor.
  • Each circle 27 represents a cylindrical sleeve to form the substrate for a printing blanket or a fuser roll.
  • a rotating disc 28 is mounted for rotating on a vertical axis 31 and vertically traverses at least the full length of cylindrical sleeves 27 is situated within an arcuate spray-booth 29.
  • Conveyor 26 and cylindrical sleeves 27 are grounded and a high voltage source 37 is coupled to rotating disc 28.
  • a typical tubular printing blanket 11 shown in FIG. 3 includes a plurality of layers deposited on rigid substrate 12.
  • substrate 12 is generally formed of metal, such as nickel in the form of a sleeve that is slightly deformable for installation on a blanket cylinder.
  • substrate 12 is an aluminum insert.
  • sleeve 12 can be formed of fiberglass, or a polymeric material such as polyester, having a thickness of about 0.030 inch.
  • primer 18 and 19 are applied to substrate 12 prior to electrostatic spraying. This ensures good adhesion between substrate 12 and first or base compressible layer 13.
  • primer 18 may be Chemlok 205 and primer coat 19 may be Chemlok 220, both available from Lord Corporation.
  • elastomer 14 is a silicone rubber
  • a silicone rubber primer such as silanes or vinyl silanes are used. Examples are SS 4004 and 4155 from General Electric, DC 1200 and DC 6060 from Dow Corning, 790 from Wacker, Chemlok 608 and 607 and Thixon 5151 from Morton International, Inc.
  • the elastomeric spray solution can be handled as a one component, a two component, or a multi-component system.
  • a two component system an elastomeric material stored in a first component tank 32 is fed onto rotating disc 28 where the centrifugal force from the disc rotating causes the solvated solution to move outward toward cylindrical sleeves 27 on conveyor 26.
  • the amount of elastomer fed to rotating disc 28 is regulated by a first metering pump 33 controlled by a first control valve 34.
  • a second component tank 38 an elastomeric material stored in a first component tank
  • a second component tank 38 includes a catalyst stored in a second component tank 39 and is fed by a second metering pump 41 through a valve 42 to static mixer 36 where it is blended with elastomer from first component tank 32 in and a static mixer 36.
  • An additional component tank for storing elastomer in a different composition than stored in first component tank 32 may be utilized to vary the composition of the coating applied to cylindrical sleeves 27 or to form the outer layer of a printing blanket or fuser rolls. This allows the composition of compressible layer 13 to be varied in a radial direction without having to form a separate layer.
  • printing blanket 11 prepared in accordance with the invention is shown in perspective. Printing blanket 11 includes nickel sleeve 12 with an outer layer 17.
  • primer layer 18 is disposed on nickel sleeve 12 and adhesive 19 is disposed on primer layer 18.
  • Seamless tubular compressible layer 13 including elastomer 14 and microballoons 16 is shown disposed on adhesive layer 19.
  • an outer layer which forms the printing surface of printing blanket 11 is shown disposed on compressible layer 13.
  • an outer printing layer is formed of a similar relatively soft elastomeric material, such as a nitrite rubber.
  • a similar relatively soft elastomeric material such as a nitrite rubber.
  • This nitrite rubber composition can be solvated in a typical methyl ethyl ketone electrostatic spray solution as there are no microspheres.
  • a typical solution can be a 50-50 weight mixture of methyl ethyl ketone and methyl isobutyl ketone.
  • Disc 28 is rotated between 500 to 8,000 rpm, preferably between about 2500 to 5000 rpm, to provide the centrifugal force to direct the atomized particles towards conveyor 26 and cylindrical sleeves 27.
  • conveyor 26 and metallic sleeves attached thereto are grounded so that an electrical attraction exists between atomized particles leaving rotating disc 28 and cylindrical sleeve 27.
  • the combination of the throwing out action from disc 28 and repulsion of commonly charged particles for each other in the solution causes a high degree of atomization.
  • the attraction of the charged particles in the atomized spray to the grounded parts on the conveyor causes the parts to be coated. Any material that passes between the parts of the conveyor is deposited on the sides and backs of the parts due to the electrical attraction.
  • Typical spray parameters and equipment are discussed in U.S. Patent No. 2,754,226 issued on July 10, 1956 and
  • composition using a blend of solvent provides a specific spray condition where atomization and solvent evaporation of the material occurs before contact with the part without damaging integrity of the microballoons. This prevents the coating from sagging while allowing single pass coating from about 10 to 40 microns per pass. After 35 to 75 passes the deposited layers may be at least 1,500 microns inch in thickness.
  • the reciprocating action of disc 28 along vertical axis 31 adds to the uniformity to the coating in the lengthwise direction.
  • compressible layer 13 is allowed to dwell for between about 12 to 48 hours at room temperature and then cure. The cure is conducted in an air circulating oven and the cure time and temperature varies according to the type of material used. A cure schedule of 1 hr each at 100, 150, 200, 250° F and 2 hours at 300° F is also suitable. Cured compressible layer 13 is then mounted on a mandrel and ground to a desired size as is well known in the art.
  • outer layer 17 may be made using similar spray parameters described.
  • the composition of the outer layer contains a nitrile compound with no microballoons. Accordingly it can be solvated using a 50/50 blend by weight of methyl ethyl ketone and methyl isobutyl ketone.
  • the coated outer layer is allowed to dwell for between 12 to 48 hours and cured for one hour each at 150, 200 and 250° F and for 2 hours at 300°F in a circulating oven. Alternatively, cure may be in an autoclave for 2 hours at 300°F.
  • Coated blanket 11 is then mounted on a mandrel and ground to a finished size.
  • an inextensible layer When preparing printing blankets in acceptance with the invention, it may be desirable to include an inextensible layer by encapsulating a thread in the elastomer without microspheres. The thread is then would in a helix about the outer compressible layer. This applies a radially compressive preload to the compressible layer. It is then cured in a similar manner as the compressible layer.
  • the electrostatic spray apparatus in each preparatory example includes a rotating disc and endless conveyor as illustrated in FIGS. 1 and 2.
  • a compressible layer coated substrate suitable for fabrication of a lithographic printing blanket was prepared using a standard 0.005 inch thick nickel sleeve 7.08 inches in diameter and 57 inches long as the reinforcing member.
  • the sleeve was coated with a compressible layer of 100 parts of a nitrile rubber composition of Table I including 5 parts Expancel microspheres.
  • the rubber composition was first solvated in 562 parts of methyl isobutyl ketone and 120 parts of methyl amyl ketone. The microspheres were then mixed into the solvated rubber.
  • the solvated rubber composition with microspheres was electrostatically sprayed onto the nickel sleeve in the apparatus shown in FIGS. 1 and 2.
  • the chain speed of an advancing sleeve was about 35 inches/minute and was rotated about 5 revolutions per minute.
  • the disk was rotated at 1900 revolutions per minute with a solution flow rate of 450 grams per minute.
  • the reciprocating disk traversed the length of the sleeve at a rate of 6 strokes per minute.
  • the applied voltage was 35 KV and the amperage was 0.15. After fifty passes the sleeve was coated to a thickness of 0.055 inch.
  • the coated compressible layer was cured according to the process described above and then ground. After grinding to a coating thickness of 0.037 inch, examination of the coating cross section revealed the presence of uniformly distributed microcell structure.
  • the ground compressible layer was then coated by electrostatic spraying with an outer layer material. 100 Parts of the rubber composition set forth in Table II without microspheres was solvated in a mixture of 350 parts methyl ethyl ketone and 350 parts methyl isobutyl ketone and electrostatically sprayed in the same apparatus to a coating thickness of 0.025 inch.
  • the blanket was cured according to the process described above and then ground to a top layer thickness of 0. 012 inch to yield a finished printing blanket.
  • a compressible layer coated substrate suitable for fabrication of a lithographic printing blanket was prepared using a standard 0.005 inch thick nickel sleeve 7.08 inches in diameter and 57 inches long as the reinforcing member.
  • the sleeve was coated with a first compressible layer of 100 parts of a nitrile rubber composition of Table I including 5 parts Expancel microspheres.
  • the rubber composition was first solvated in 562 parts of methyl isobutyl ketone and 120 parts of methyl amyl ketone. The microspheres were then mixed into the solvated rubber.
  • the solvated rubber composition with microspheres was electrostatically sprayed onto the nickel sleeve in the apparatus shown in FIGS. 1 and 2.
  • the chain speed of an advancing sleeve was about 35 inches/minute and was rotated about 5 revolutions per minute.
  • the disk was rotated at 1900 revolutions per minute with a solution flow rate of 450 grams per minute.
  • the reciprocating disk traversed the length of the sleeve at a rate of 6 strokes per minute.
  • the applied voltage was 35 KV and the amperage was 0.15. After fifteen passes the sleeve was coated to a thickness of 0.015 inch.
  • the coated compressible layer was electrostatically sprayed with a second compressible layer of the same solvated rubber composition at the first layers, but with 2.5 parts of Expancel microspheres. After 40 additional passes the second compressible layer was 0.040 inch thick.
  • the coated sleeve was then cured following the sequence described above. After curing, the outer compressible layer was ground to a thickness of 0.037 inch. Examination of the coating cross-section revealed the presence of uniformly distributed microcell structure in the first compressible layer and a less dense distribution in the second compressible layer.
  • the ground compressible layer was then coated by electrostatic spraying with an outer layer material as in Example 1.
  • This coating was 100 parts of the rubber composition set forth in Table II without microspheres solvated in a mixture of 350 parts methyl ethyl ketone and 350 parts methyl isobutyl ketone. After twenty five passes the outer layer was coated to a thickness of 0.025 inch. The blanket was cured according to the process described above and then ground to a top layer thickness of 0.
  • a compressible layer coated substrate suitable for fabrication of a lithographic printing blanket was prepared using a standard 0.005 inch thick nickel sleeve 7.08 inches in diameter and 57 inches long as the reinforcing member.
  • the sleeve was coated with a first compressible layer of 100 parts of a nitrile rubber composition of Table I including 5 parts Expancel microspheres.
  • the rubber composition was first solvated in 562 parts of methyl isobutyl ketone and 120 parts of methyl amyl ketone. The microspheres were then mixed into the solvated rubber.
  • the solvated rubber composition with microspheres was electrostatically sprayed onto the nickel sleeve in the apparatus shown in FIGS. 1 and 2.
  • the chain speed of an advancing sleeve was about 35 inches/minute and was rotated about 5 revolutions per minute.
  • the disk was rotated at 1900 revolutions per minute with a solution flow rate of 450 grams per minute.
  • the reciprocating disk traversed the length of the sleeve at a rate of 6 strokes per minute.
  • the applied voltage was 35 KV and the amperage was 0.15. After fifteen passes the sleeve was coated to a thickness of 0.015 inch.
  • the coated compressible layer was electrostatically sprayed with a second compressible layer of the same solvated rubber composition at the first layers, but with 2.5 parts of Expancel microspheres. After 40 additional passes the second compressible layer was 0.040 inch thick.
  • the coated sleeve was then cured following the sequence described above.
  • the outer compressible layer was ground to a thickness of 0.037 inch.
  • the ground compressible layer was then coated by electrostatic spraying with an outer layer material as in Example 1.
  • This coating was 100 parts of the rubber composition set forth in Table II without microspheres solvated in a mixture of 350 parts methyl ethyl ketone and 350 parts methyl isobutyl ketone. After twenty five passes the outer layer was coasted to a thickness of 0.025 inch.
  • the blanket was
  • Example 4 A compressible layer coated substrate suitable for fabrication of a fusing roll was prepared using a standard 2.0 inch diameter aluminum insert as the substrate.
  • the insert was coated with a silicone rubber, identified as RHODIA 48V 20,000 including 5 parts Expancel microspheres.
  • the silicone was first solvated in a mixture of 105 parts methyl ethyl ketone, 225 parts of methyl isobutyl ketone and 120 parts of methyl amyl ketone. The microspheres were then mixed into the solvated silicone prior tot spraying.
  • the silicone composition with microspheres was electrostatically sprayed onto the aluminum insert in the apparatus shown in FIGS. 1 and 2.
  • the chain speed of an advancing sleeve was about 35 inches/minute and was rotated about 5 revolutions per minute.
  • the disk was rotated at 1900 revolutions per minute with a solution flow rate of 450 grams per minute.
  • the reciprocating disk traversed the length of the sleeve at a rate of 6 strokes per minute.
  • the applied voltage was 35 KV and the amperage was 0.15. After twenty five passes the sleeve was coated to a thickness of 0.025 inch.
  • the coated compressible layer was cured according to the process described above and then ground. After grinding to a coating thickness of 0.010 inch, examination of the coating cross section revealed the presence of uniformly distributed microcell structure in the compressible silicone layer.
  • the ground compressible layer was then coated by electrostatic spraying with an outer layer of fluoroelastomer material.
  • the material was 100 parts of DOW fluoroelastomer identified as DC 94003, 10 parts G.E. Silicone known as CRTV 942, solvated in 350 parts methyl ethyl ketone and 350 parts methyl isobutyl ketone and electrostatically sprayed in the same apparatus to a coating thickness of 0.002 inch.
  • printing blankets and fuser rolls having a compressible layer including microballoons can be easily prepared using electrostatic spraying.
  • a high molecular weight ketone solvent including methyl amyl ketone and methyl isobutyl ketone is utilized. It has been found that the articles prepared in this manner provide excellent lithographic and fusing surfaces in view of the fact that there are no additional materials in the compressible layer other than the elastomer and resin microballoons.
  • ingredients or compounds recited in the singular are intended to include compatible mixtures of such ingredients whenever the sense permits.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un procédé de pulvérisation électrostatique, destiné à former des blanchets d'imprimerie et des roulettes de fixeurs électrostatiques, comprenant un substrat sensiblement rigide à couche compressible d'élastomère à microsphères de résine qui sont dispersées à l'intérieur et disposées sur celle-ci et une surface extérieure d'impression ou de fusion. La pulvérisation électrostatique de ladite couche compressible nécessite un solvant polaire comprenant au moins 50 pour-cent en poids de cétone à poids moléculaire élevé, perdant au moins six atomes de carbone. L'invention concerne également de la méthyle amyle cétone et de la métyle isobutyle cétone destinées à éviter des dommages mécaniques et chimiques pour les microballes de résines.
PCT/US2003/005554 2002-02-25 2003-02-24 Articles elastomeres recouverts et leur procede de production WO2003072267A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003228220A AU2003228220A1 (en) 2002-02-25 2003-02-24 Elastomeric coated articles and method of manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8326902A 2002-02-25 2002-02-25
US10/083,269 2002-02-25

Publications (2)

Publication Number Publication Date
WO2003072267A2 true WO2003072267A2 (fr) 2003-09-04
WO2003072267A3 WO2003072267A3 (fr) 2004-06-03

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2008065406A1 (fr) * 2006-11-30 2008-06-05 Formformform Ltd Composition elastomère de silicone durcissable a la température ambiante
CN109201754A (zh) * 2018-09-01 2019-01-15 江苏宏宝优特管业制造有限公司 一种钢管外壁润滑设备及润滑方法

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US4042743A (en) * 1970-06-11 1977-08-16 Uniroyal, Inc. Compressible offset printing blanket
US5364683A (en) * 1992-02-14 1994-11-15 Reeves Brothers, Inc. Compressible printing blanket and method of making same
US5553541A (en) * 1989-10-05 1996-09-10 Heidelberg Harris Inc Gapless tubular printing blanket
EP0987125A1 (fr) * 1998-09-14 2000-03-22 Sumitomo Rubber Industries Ltd. Couche compressible pour blanchet d'impression et procédé pour sa fabrication
US20030129384A1 (en) * 2001-07-10 2003-07-10 Kalchbrenner Joseph Carl Printing blanket face and compressible layer compositions

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US4042743A (en) * 1970-06-11 1977-08-16 Uniroyal, Inc. Compressible offset printing blanket
US5553541A (en) * 1989-10-05 1996-09-10 Heidelberg Harris Inc Gapless tubular printing blanket
US5364683A (en) * 1992-02-14 1994-11-15 Reeves Brothers, Inc. Compressible printing blanket and method of making same
EP0987125A1 (fr) * 1998-09-14 2000-03-22 Sumitomo Rubber Industries Ltd. Couche compressible pour blanchet d'impression et procédé pour sa fabrication
US20030129384A1 (en) * 2001-07-10 2003-07-10 Kalchbrenner Joseph Carl Printing blanket face and compressible layer compositions

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008065406A1 (fr) * 2006-11-30 2008-06-05 Formformform Ltd Composition elastomère de silicone durcissable a la température ambiante
US9284454B2 (en) 2006-11-30 2016-03-15 Formformform Ltd. Room temperature curable silicone elastomer composition
CN109201754A (zh) * 2018-09-01 2019-01-15 江苏宏宝优特管业制造有限公司 一种钢管外壁润滑设备及润滑方法
CN109201754B (zh) * 2018-09-01 2024-03-22 江苏宏宝优特管业制造有限公司 一种钢管外壁润滑设备及润滑方法

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AU2003228220A8 (en) 2003-09-09
AU2003228220A1 (en) 2003-09-09

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