EP0320533B1 - Rolle, mit Silikonmaterial überzogen und Verfahren zu ihrer Herstellung - Google Patents

Rolle, mit Silikonmaterial überzogen und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0320533B1
EP0320533B1 EP87118873A EP87118873A EP0320533B1 EP 0320533 B1 EP0320533 B1 EP 0320533B1 EP 87118873 A EP87118873 A EP 87118873A EP 87118873 A EP87118873 A EP 87118873A EP 0320533 B1 EP0320533 B1 EP 0320533B1
Authority
EP
European Patent Office
Prior art keywords
roll
layer
organopolysiloxane
silicon
mold
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.)
Expired - Lifetime
Application number
EP87118873A
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English (en)
French (fr)
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EP0320533A1 (de
Inventor
Koji Shimizu
Keiji Yoshida
Mitsuo Hamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DuPont Toray Specialty Materials KK
Original Assignee
Toray Silicone Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP61299311A external-priority patent/JPH0799170B2/ja
Application filed by Toray Silicone Co Ltd filed Critical Toray Silicone Co Ltd
Priority to EP87118873A priority Critical patent/EP0320533B1/de
Priority to DE8787118873T priority patent/DE3765252D1/de
Publication of EP0320533A1 publication Critical patent/EP0320533A1/de
Application granted granted Critical
Publication of EP0320533B1 publication Critical patent/EP0320533B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
    • G03G15/1685—Structure, details of the transfer member, e.g. chemical composition
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
    • G03G15/2057—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating relating to the chemical composition of the heat element and layers thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/206—Structural details or chemical composition of the pressure elements and layers thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0058—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a roller or a polygonal rotating cleaning member; Details thereof, e.g. surface structure

Definitions

  • This invention relates to a method for producing a roll covered with a silicone material suitable for the various applications including transfer rolls, heating rolls, pressure rolls and clearing rolls, typically found in electrophotographic copiers and facsimile devices. More particularly this invention relates to a method for producing such rolls that contain a surface layer of cured silicone material that is harder than the underlying rubber.
  • Contact thermal fixing is widely used, for example in electrophotographic copiers.
  • contact thermal fixing an image is electrophotographically formed or the photoreceptor by toner (a thermoplastic resin powder). subsequently transferred to the transfer sheet and then fixed in a fixing element to generate the copy.
  • toner a thermoplastic resin powder
  • Contact thermal fixing employs a device referred to as a heat-fixing roll assembly comprising a hard heated roll, whose surface has both heat resistance and releasibility, and a soft pressure roll, which possesses heat resistance, releasibility, and flexibility.
  • a heat-fixing roll assembly comprising a hard heated roll, whose surface has both heat resistance and releasibility, and a soft pressure roll, which possesses heat resistance, releasibility, and flexibility.
  • these two heat-fixing rolls are pressed together at a designed pressure, and the image-carrying transfer paper is passed between the rolls. Under these conditions the soft roll should undergo an increase in contact area while in contact with the hard roll in order to obtain a clear image.
  • a problem encountered with prior art soft rolls is their tendency to assume a permanent set because they are continually being deformed.
  • rolls have been proposed in which a relatively hard material such as a fluorinated resin or a flexible metal is additionally coated around the outer circumference of a low-hardness rubber.
  • Japanese Patent Publication No. 20232/80 published on April 19, 1980, discloses a roller comprising a metal core, an under-coat of a specified organosiloxane composition that also includes an allyl ester of a polybasic acid, a metal salt of a fatty acid and an alkoxysilane. and an outer coating of a silicone rubber.
  • Japanese Patent Publication No. 26070/61 which was published on February 5, 1986, is directed to a heat fixing roll comprising a layer of silicone rubber sponge and a hard layer formed on the outer surface of the sponge rubber.
  • U.S. Pat. No. 4,329,565 which issued to Namiki et al. on May 11, 1982, discloses a fixing roll comprising a layer of resilient material that is overlaid with a layer of offset-preventing material containing from 1 to 5 percent of a thermally conductive metal powder.
  • the offset-preventing material can be a silicone, fluorosilicone or organic resin.
  • Japanese Patent Publication No. 56854/57 which issued on April 5, 1982 discloses a roller formed from a heat hardenable silicone rubber that is coated with a layer of anti-static material prepared by adding a peroxide and either sodium sulfate or a sulfonamide to a heat hardenable silicone rubber.
  • Canadian Pat. No. 1,116,549 which issued on January 19, 1982 discloses a fuser roll for a copier consisting essentially of a thermally conductive metal tube coated with a thin layer of a cured silicone rubber.
  • the rubber layer exhibits a thickness of about 0.25 mm. and is exposed to ultra-violet radiation under an inert atmosphere following curing.
  • Japanese Patent Publication No. 38957/61 which was published on August 20, 1987 discloses forming a roller by molding a silicone rubber on a metal core, inserting the roller into a tube formed from a fluorinated resin and heating the resultant composite to shrink the resin tube on to the silicone rubber layer.
  • a heat resistant material such as a curable silicone rubber composition
  • Japanese Patent Publication No. 26027/87 which was published on June 5, 1987 discloses a fixing roll comprising a metal roll, an inner layer of a silicone rubber and an outer layer of a fluorosilicone rubber.
  • U.S. Pat. No. 4,149,797 which issued to G. Imperial on April 17, 1979 and U.S. Pat. No. 4,083,092, which issued to Imperiale et al. on April 11, 1978 disclose a fixing roll comprising a rigid core, an organic rubber layer adhered to the core and an outer protective sleeve.
  • the sleeve has a high flex life and blocks air from reaching and oxidizing the rubber.
  • JP-A 61 231 578 discloses a method for producing a roller by forming elastic rubber layers of multilayer structure higher in hardness as a layer approaches the surface layer and coating the surface layer with a thin fluororesin film.
  • These rubber layers are prepared by injection molding silicone rubbers different in hardness and vulcanizable at low temperature into two layers, the deeper silicone rubber layer in contact with the core has lower hardness of 25 to 30 ° , and the higher layer has a higher hardness of 70 to 100 ° .
  • JP-A 61 185 775 discloses a method for producing a roller by applying to a metal roller core a soft silicone rubber having a JIS hardness of 15 to 35 ° and the thereupon a hard layer of a silicone rubber having 65 to 90 ° in JIS hardness. The surface of said silicone rubber is then coated with an organic fluoro compound.
  • Japanese Patent Publication No. 3 895 761 which was published on August 20, 1987 discloses forming a roller by molding a silicone rubber ona metal core, inserting the roller into a tube formed from a fluorinated resin and heating the resultant composite to shrink the resin tube on to the silicone rubber layer.
  • a heat resistant material such as a curable silicone rubber composition
  • Japanese Patent Publication No. 2 602 787 which was published on June 5, 1987 discloses a fixing roll comprising a metal roll, an inner layer of a silicone rubber and an outer layer of a fluorosilicone rubber.
  • US Patent 4 149 797 which issued to G. Imperial on April 17, 1979 and US Patent 4 083 092, which issued to Imperiale et al. on April 11, 1978 disclose a fixing roll comprising a rigid core, an organic rubber layer adhered to the core and an outer protective sleeve.
  • the sleeve has a high flex life and blocks air from reaching and oxidizing the rubber.
  • Soft rolls known in the art including the silicone rubber-covererd rolls, suffer from the problems of 1) not increasing in contact area along the line of contact between the soft roll and the aforementioned hard roll 2) and assuming a permanent compression set. As a result, there is a strong tendency for the copy image to be unclear.
  • An objective of the present invention is to provide a method for preparing a soft roll coated will a silicone material which is not subject to permanent set during use and which has an excellent resistance to soiling.
  • a particular object of the present invention is to provide a method for producing a soft roll whose contact area with an adjacent hard roll can expand along the line of contact with a hard roll. This provides a clear copy image when the rubber-covered roll is used as a fixer roll in an electrophotographic device.
  • a method for producing a roll coated with silicone material comprising a roll axle coated with an inner layer of elastomeric cured silicone material having a hardness value of no greater than 30 on the Japanese Industrial Standards (JIS) A scale, where the lower surface of said layer is in contact with said axle and the upper surface of said layer is in contact with an outer layer of a cured silicone material having a hardness greater than that of said inner layer, wherein said roll is produced by coating the interior surface of a cylindrical mold with an organopolysiloxane having at least 3 silicon-bonded hydrogen atoms in each molecule, mounting said roll axle in said mold introducing into said mold; a curable liquid silicone rubber composition that will yield said silicone material having said hardness valued no greater than 30 on the JIS A scale and curing said organopolysiloxane and said liquid silicone rubber composition by heating.
  • JIS Japanese Industrial Standards
  • the axle is formed from a metal typically used as a roll core metal.
  • the surface of the axle can be treated with an anticorrosive agent or a primer.
  • the inner layer of the present roll is adjacent to the roll axle and consists essentially of an elastomeric cured silicone material having a hardness no greater than 30 on the JIS A scale.
  • This material is obtained from an organopolysiloxane-based composition that cures either at room temperature or upon heating.
  • the cured silicone material is not specifically restricted, and includes silicone gels and conventional silicone rubbers.
  • the hardness of the cured material must be no greater than 30 on the JIS A scale, measured as specified in JIS C 2123.
  • the hardness of the cured silicone material is preferably no more than 20, and most preferably no more than 10.
  • the thickness of the inner layer is not specifically restricted, and will depend upon the end use application of the roll.
  • An outer layer of cured silicone material having a hardness in excess of that of the aforementioned inner layer of cured silicone material is the characterizing feature of the present rolls.
  • the principal component of the cured surface layer is at least one organopolysiloxane.
  • the organopolysiloxanes present in the inner and outer layers are identical.
  • cured materials suitable for use as the outer layer are silicone rubbers and silicone resins.
  • the cured outer layer must be harder than the cured inner layer.
  • a harness value in the range of 35 to 90 on the JIS A scale is preferred for the outer layer.
  • the hardness of the outer layer is less than that of the cured inner layer. the roll will have a tacky surface, and will not exhibit the desired resistance to soiling and development of a permanent compression set.
  • the cured outer layer preferably has a thickness of approximately 1/10 to 1/1000 that of aforementioned inner layer.
  • the thickness of the outer layer is preferably no greater than 1,000 microns.
  • the mold used to manufacture the silicone-covered roll in accordance with the present method can be formed from metal, silicone rubber, or a synthetic resin such as a polyester or nylon. These materials are typically used as mold materials for silicone rubber compositions.
  • an organopolysiloxane containing at least 3 silicon bonded hydrogen atoms is applied to the interior surface of the mold, the roll axle is placed in the center of the mold cavity and the cavity is subsequently filled with a curable liquid silicone composition that will form the inner layer of the roll upon curing.
  • the organopolysiloxane is in contact with and cures together with the curable liquid silicone composition during molding to form the hard outer layer of the roll.
  • this organopolysiloxane must have at least 3 silicon-bonded hydrogen atoms in each molecule, it can be used in combination with an organopolysiloxane having 2 silicon-tonded hydrogen atoms in each molecule to vary the hardness of the outer layer.
  • the molecular structure of the organopolysiloxane containing at least three silicon-bonded hydrogen atoms per molecule is not specifically restricted.
  • the molecular structure of this molecule may be straight chain, branch-containing straight chain, or cyclic.
  • a branched organopolysiloxane for example, a copolymer composed of (CH 3 ) 2 HSiO11 ⁇ 2 and Si0 4/2 units, or a copolymer of (CH3).3SiOl/2, (CH3)2HSid/2, and Si0 4/2 units.
  • Non-limiting examples of the organopolysiloxane ingredient include but are not limited to trimethylsiloxy-terminated methylhydrogenpolysiloxanes, trimethylsiloxy-terminated dimethylsiloxane-methylhydrogensiloxane copolymers, dimethylhydrogensiloxy-terminated dimethylsiloxane-methylhydrogensiloxane copolymers, dimethylsiloxane-methylhydrogensiloxane cyclic copolymers, copolymers composed of (CH 3 ) 2 HSiO l/2 and Si0 4/2 units, and copolymers composed of (CH 3 ) 3 SiO1 ⁇ 2, (CH 3 ) 2 HSiO l/2 , and Si0 4/2 units.
  • the organopolysiloxane can be applied to the inner surface of the mold by any of the known conventional means, including spraying, brushing and sponge coating. No specific restriction apply to quantity of organopolysiloxane, applied to the inner mold surface, as long as a continuous, dry film is formed on the mold surface.
  • the curable liquid silicone composition that forms the inner elastomer layer of the present roll can be a liquid or paste at room temperature. and is based on a reactive group-containing liquid organopolysiloxane, a crosslinker and/or a curing catalyst.
  • the composition is capable of curing into a rubbery elastomer or gel at room temperature or with heating. It can be of the "sag” or “non-sag” type.
  • the curing mechanism of this composition is not critical, and can be an addition-reaction mechanism, organoperoxide-based radical reaction-curing mechanism, or condensation-reaction mechanism. Compositions that cure by means of an addition reaction are preferred in order to obtain a faster and more uniform curing.
  • Particularly preferred addition-curable liquid silicone compositions for use in preparing the inner elastomer layer comprise (A) an organopolysiloxane having at least 2 lower alkenyl groups in each molecule; (B) an organopolysiloxane having at least 2 silicon-bonded hydrogen atoms in each molecule, in a quantity such that the molar ratio of the total quantity of silicon-bonded hydrogen atoms in the present component to the total quantity of all lower alkenyl groups in component (A) is from 0.1 to 1; and (C) a concentration of a platinum-type catalyst equivalent to from 0.1 to 1,000 weight parts platinum metal for each one million weight parts of the total of components (A) and (B).
  • Component (A) of the preferred curable compositions is the principal component of the composition. Curing of the composition proceeds by the addition reaction of component (A) with component (B) under the catalytic activity of component (C).
  • Component (A) must contain at least 2 silicon-bonded lower alkenyl radicals in each molecule. These lower alkenyl radicals are exemplified by vinyl, allyl, and propenyl.
  • the alkenyl radicals of ingredient (A) can be present at any location in the molecule, but are preferably present at least at the molecular terminals.
  • the molecular configuration of this component can be straight chain, branch-containing straight chain, cyclic, or network, but is preferably straight chain, possibly slightly branched. No specific restriction applies to the molecular weight of this component.
  • the viscosity may range from that of low- viscosity liquids to very high-viscosity gums and thus is not specifically restricted, the viscosity at 25 ° C is preferably at least 100 centipoise (0.1 Pa.s) in order to obtain a cured material in the form of a rubbery elastomer.
  • alkenyl-substituted organopolysiloxane examples include but are not limited to methylvinylpolysiloxanes, methylvinylsiloxane- dimethylsiloxane copolymers, dimethylvinylsiloxy-terminated dimethylpolysiloxanes, dimethylvinylsiloxy-terminated
  • Component (B) of the preferred compositions for preparing the inner elastomer layer of the present rolls is a crosslinker for component (A). Curing proceeds by the addition of the silicon-bonded hydrogen atoms in this component with the lower alkenyl groups in component (A) under the catalytic activity of component (C). This componen (B) must contain at least 2 silicon-bonded hydrogen atoms in each molecule in order to function as a crosslinker.
  • component (B) is not specifically restricted, and can be straight chain, branch-containing straight chain, or cyclic.
  • the molecular weight of this component is likewise not specifically restricted, however the viscosity of this component, measured at 25 ° C., is preferably 1 to 50,000 centipoise (0.001 to 50 Pa.s) in order to obtain good miscibility with component (A).
  • the concentration of component (B) is preferably one that will provide a molar ratio of silicon-tonded hydrogen atoms to all lower alkenyl radicals in component (A) of from 0.1 to 1. Most preferably this ratio is from 0.4 to 0.6.
  • the crosslinking density will be too low at molar ratios below 0.1, resulting in unsatisfactory curing.
  • the crosslinking density of the cured inner layer will be too high when the molar ratio silicon-tonded hydrogen atoms to total alkenyl radicals exceeds 1, and it will be difficult to form a hard covering layer at the surface of the silicone-covered roll.
  • the amount of organo- poly-siloxane containing silicon-bonded hydrogen atoms is preferably sufficient to reacts with these additional alkenyl radicals.
  • component (B) examples include but are not limited to trimethylsiloxy-terminated
  • Component (C) of the preferred curable compositions is a catalyst for the addition reaction of silicon-bonded hydrogen atoms with alkenyl radicals.
  • this component include chloroplatinic acid, including solutions of this catalyst in alcohol or ketone and these solution following aging, chloroplatinic acid-olefin complexes, chloroplatinic acid-alkenylsiloxane complexes, chloroplatinic acid-diketone complexes, platinum black, and platinum supported on a carrier.
  • Component (C) is present in an amount equivalent to from 0.1 to 1,000 weight parts of platinum-group metal for each one million parts by weight (ppm) of the total quantity of components (A) and (B).
  • the crosslinking reaction will not proceed satisfactorily at below 0.1 ppm. while exceeding 1,000 weight parts is uneconomical.
  • the preferred catalyst concentration is equivalent to approximately 1 to 100 ppm of platinum-group metal.
  • the curable liquid silicone compositions used to form the inner layer of the present roller can include at least one filler to adjust the fluidity and/or improve the mechanical strength of the molded article.
  • these fillers are exemplified by reinforcing fillers such as precipitated silica, fumed silica, calcined silica, and fumed titanium dioxide, and by non- reinforcing fillers such as quartz powder, diatomaceous earth. asbestos, aluminosilicic acid, iron oxide, zinc oxide, and calcium carbonate.
  • the surface of the filler can optionally be treated with an organosilicon compound, for example, hexamethyldisilazane, trimethylchlorosilane, or a hydroxyl terminated polydimethylsiloxane.
  • the present curable liquid silicone compositions can also include small or very small amounts of inhibitors for the curing reaction, so long as these inhibitors do not adversely affect the objectives of the present invention.
  • inhibitors include acetylenic compounds, hydrazines, triazoles, phosphines, and mercaptans.
  • curable precursor of the elastomeric inner layer include but are not limited to pigments, heat stabilizers, flame retardants, plasticizers, and organopolysiloxane having 1 alkenyl radical in each molecule that are added to reduce the modulus of the cured elastomeric inner layer.
  • a second class of preferred curable liquid organosiloxane compositions cure by means of a free radical reaction and include an organoperoxide as the curing agent.
  • These compositions include a vinyl group-containing diorganopolysiloxane that is liquid at room temperature and a catalytic quantity of organoperoxide.
  • Optional ingredients include but are not limited to inorganic fillers such as fumed silica and precipitated silica, heat stabilizers, and pigments.
  • the organoperoxide preferably has a decomposition temperature in the range of +25 to +100 ° C.
  • Compression molding, transfer molding, and injection molding are typically used to mold liquid silicone rubber compositions, and can be used to introduce the present curable liquid silicone rubber compositions into the interior of the mold and thermally cure them.
  • the molding temperature should be within the range of from 50 to 220 ° C and preferably in the range of 50 to 170 ° C.
  • the silicone-covered roll of the present invention finds use in various applications, for example, as the transfer rolls, fixing rolls, or cleaning rolls used in electrophoto-graphic copiers, and as paper-advance rolls in facsimile devices.
  • a curable liquid silicone composition of this invention was obtained by blending this mixing together with 0.1 part of a solution of chloroplatinic acid in isopropanol. The solution contained 3 percent of platinum.
  • a metal mold designed for the molding of silicone elastomer-covered rolls and having a chromium-plated interior surface was coated on its interior surface with a trimethylsiloxy-terminated methylhydrogenpolysiloxane having a viscosity of 10 centistokes (10-5 m 2 /sec ) and a silicon bonded hydrogen atom content of 1.0 wt% to yield a uniform coating density of 0.2 g per square meter.
  • a cylindrical iron roll axle was also prepared, and coated with a primer consisting essentially of an organopolysiloxane gum, an organopolysiloxane resin, ethyl silicate, a methylhydrogenpolysiloxane, and an organotitanate ester.
  • the primer was applied to the surface of the roll and subsequently cured.
  • the primed roll axle was mounted inside the aforementioned metal mold, and the liquid silicone composition prepared as described in the preceding portion of this example was then injected into the cavity and thermally cured at 150 ° C for 10 minutes. After cooling, the obtained silicone-covered roll was removed and the interior portion of the coating was exposed by cutting into the coating using a knife.
  • the resiliency of the rubber layer was 10% and the permanent compression set was 15%.
  • the compression set value was obtained by compressing the rubber layer to 75% of its initial thickness for a period of 72 hours while heating the roll at a temperature of 180 ° C.
  • the same methylhydrogenpolysiloxane described in the preceding Example 1 was sprayed on the interior surface of an metal injection mold.
  • the mold was heated to a temperature of 120 ° C at which time an iron roll core was mounted in the interior of the mold, and the liquid silicone composition prepared as above was then injected and cured.
  • the hardness values of the exterior and interior layers of the resultant silicone elastomer-covered roll of this invention were measured as described in the preceding Example 1, and were 38 and 3, respectively, measured using the JIS A scale. When this roll was used as a paper-advance roll in a facsimile device neither the roll surface nor the image were soiled.
  • a cylindrical metal mold having a chromium-plated inner surface was coated with a cylindrical preformed polyester film and a 10% solution in toluene of a trimethylsiloxy-terminated methylhydrogenpolysiloxane exhibiting a viscosity of 10 centistokes (1x10-5 m 2 /sec) and containing 1 percent of silicon-bonded hydrogen was sprayed on the exposed surface of the film to produce a coating density of 5 grams per square meter. The coating was then dried. An aluminum roll axle was then inserted into the cavity's interior, and the liquid silicone rubber composition prepared as described in the preceding portion of this Example was then injected and thermally cured at 130 ° C for 5 minutes.
  • This silicone elastomer-covered roll of this invention was used as the pressure roll in the fixing rolls of an electrophotographic copier. No permanent compression set in the roll was observed, and the copied image was clear.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Fixing For Electrophotography (AREA)

Claims (4)

1. Verfahren zur Herstellung einer mit Silikonmaterial bedeckten Walze, wobei die Walze eine Walzenachse, die mit einer inneren Schicht von elastomerem, gehärtetem Silikonmaterial mit einem Härtewert von nicht mehr als 30 auf der Japanese Industrial Standards (JIS) A Skala beschichtet ist, umfaßt, wobei die untere Oberfläche dieser Schicht in Kontakt steht mit der Achse und die obere Oberfläche dieser Schicht in Kontakt steht mit einer äußeren Schicht eines gehärteten Silikonmaterials, das eine Härte zeigt, die größer ist als die der inneren Schicht, wobei diese Walze hergestellt wird, indem die innere Oberfläche einer zylindrischen Form mit einem Organopolysiloxan mit mindestens 3 siliciumgebundenen Wasserstoffatomen in jedem Molekül beschichtet wird, die Walzenachse in diese Form montiert wird, in die Form eine härtbare flüssige Silikonkautschukzusammensetzung eingeleitet wird, die das Silikonmaterial mit dem Härtewert von nicht mehr als 30 auf der JIS-A-Skala ergibt und das Organopolysiloxan und die flüssige SilikonKautschukzusammensetzung durch Erhitzen gehärtet werden.
2. Verfahren nach Anspruch 1, worin die flüssige Siiikonkautschukzusammensetzung (A) ein Organopolysiloxan, das mindestens zwei Silizium-gebundene Niedrigalkenylreste in jedem Molekül enthält: (B) ein Organopolysiloxan, das mindestens zwei siliziumgebundene Wasserstoffatome in jedem Molekül hat, in einer solchen Menge, daß das molare Verhältnis der Gesamtmenge an Silizium-gebundenen Wasserstoffatomen in der vorliegenden Komponente zu der Gesamtmenge aller Niedrigalkylgruppen in Komponente (A) 0,1 bis 1 ist; und (C) einen Katalysator vom Platintyp in einer Menge, die äquivalent ist 0,1 bis 1000 Gewichtsteilen Platinmetall pro Million Gewichtsteile der Gesamtmenge der Komponenten (A) und (B), umfaßt.
3. Verfahren nach Anspruch 2, worin der Niedrigalkenylrest ein Vinylrest ist und das Organopolysiloxan mit mindestens zwei Silizium-gebundenen Wasserstoffatomen in jedem Molekül ein Polymethylhydrogensiloxan ist.
4. Verfahren nach Anspruch 3, worin die Vinylreste in einem Dimethylvinylsiloxy-terminierten Polydimethylsiloxan vorhanden sind.
EP87118873A 1986-12-16 1987-12-18 Rolle, mit Silikonmaterial überzogen und Verfahren zu ihrer Herstellung Expired - Lifetime EP0320533B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP87118873A EP0320533B1 (de) 1986-12-16 1987-12-18 Rolle, mit Silikonmaterial überzogen und Verfahren zu ihrer Herstellung
DE8787118873T DE3765252D1 (de) 1987-12-18 1987-12-18 Rolle, mit silikonmaterial ueberzogen und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61299311A JPH0799170B2 (ja) 1986-12-16 1986-12-16 シリコ−ン被覆ロ−ルとその製造方法
EP87118873A EP0320533B1 (de) 1986-12-16 1987-12-18 Rolle, mit Silikonmaterial überzogen und Verfahren zu ihrer Herstellung

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EP0320533A1 EP0320533A1 (de) 1989-06-21
EP0320533B1 true EP0320533B1 (de) 1990-09-26

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469629B1 (de) * 1990-08-03 1995-07-19 Canon Kabushiki Kaisha Elastische Rolle und diese verwendendes Fixiergerät
JPH0811243A (ja) * 1994-06-30 1996-01-16 Toray Dow Corning Silicone Co Ltd 定着ロールの製造方法
JP3153454B2 (ja) * 1995-11-10 2001-04-09 東レ・ダウコーニング・シリコーン株式会社 定着ロールおよびそのためのシリコーンゲル組成物
WO2016066232A1 (en) * 2014-10-31 2016-05-06 Hewlett-Packard Indigo B.V. Electrostatic printing apparatus and intermediate transfer members

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
Patents Abstracts of Japan, vol. 10, no. 364 (P-524)[2421], 5. Dec. 1987 & JP-A-61158362 *
Patents Abstracts of Japan, vol. 11, no. 68(P-553)[2515], 28. Febr. 1987 & JP-A-61231578 *
Patents Abstracts of Japan, vol. 11, no. 9 (P-534)[2456], 10. Jan. 1987 & JP-A-61184575 *
Patents Abstracts of Japan, vol. 11, no. 9 (P-534)[2456], 10. Jan. 1987 & JP-A-61185775 *
Patents Abstracts of Japan, vol. 8, no. 60 (P-262)[1497], 22. March 1987 & JP-A-58209768 *

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