EP0633964A1 - Feuille antistatique - Google Patents
Feuille antistatiqueInfo
- Publication number
- EP0633964A1 EP0633964A1 EP93907902A EP93907902A EP0633964A1 EP 0633964 A1 EP0633964 A1 EP 0633964A1 EP 93907902 A EP93907902 A EP 93907902A EP 93907902 A EP93907902 A EP 93907902A EP 0633964 A1 EP0633964 A1 EP 0633964A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- conductive
- layer
- sheet according
- pigments
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24851—Intermediate layer is discontinuous or differential
- Y10T428/24868—Translucent outer layer
- Y10T428/24884—Translucent layer comprises natural oil, wax, resin, gum, glue, gelatin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
- Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
- Y10T428/31993—Of paper
Definitions
- the invention relates to a sheet of paper having antistatic properties.
- Such a sheet can be used in various fields.
- Flexible abrasives consist of a support sheet on which abrasive grains are bonded with an adhesive for which it is necessary to dissipate the electrostatic charges created during their use.
- the abrasive is not treated to dissipate the charges, the dust formed during the abrasion of an object is deposited and fouls the abrasive grains; it then reduces the abrasion yield.
- workers can suffer electric shocks which make them react with uncontrolled gestures putting them in danger during their work.
- the carrier or the layer of adhesive or the surface of the grains are treated with a conductive product.
- abrasive As conductive products, quaternary ammonium salts, carbon black, metallic powders or fibers, metallic alloys, metallic salts, doped conductive polymers or inorganic pigments made conductive by coating them with an electrically conductive layer have been used. metal oxide.
- the abrasive is made conductive by incorporating carbon black into the adhesive used to bond the abrasive grains.
- the abrasive is made conductive by means of a layer of a conductive compound which may be a metal, a metal alloy, a metal pigment, a salt or a metal complex, this layer being arranged between two insulating layers.
- the conductive product can be placed on the back of the support, on the face of the support (below the adhesive), mixed with the adhesive or even on the grains.
- an abrasive is made conductive by placing a conductive layer over the abrasive grains, the conductive product being in particular graphite.
- the abrasive is made conductive by treating the surface of the layer containing the abrasive grains with a solution containing a quaternary ammonium salt.
- the abrasive is made conductive by treating the surface of the layer containing the abrasive grains with a doped conjugated polymer such as, for example, polythiophene, polyaniline, polypyrrole.
- a doped conjugated polymer such as, for example, polythiophene, polyaniline, polypyrrole.
- the sheets of paper constituting them are treated with a conductive product.
- the so-called high pressure laminates are produced from a core consisting of a stack of sheets, generally kraft paper, impregnated with a thermosetting resin, in particular a phenolic resin.
- the sheets of kraft paper impregnated with resin are dried, cut, then stacked on top of each other; the number of stacked sheets depends on the applications, it generally varies between three and nine.
- a decorative sheet which can be plain, with printed patterns or even presented an iridescent or metallic appearance and being impregnated with a thermosetting resin which does not blacken with heat (for example a resin melamine-formaldehyde).
- a protective covering sheet called “overlay”, also impregnated with a resin, devoid of pattern and transparent in the final laminate, is placed above the decorative sheet.
- the pile of the various types of impregnated sheets is placed in a press provided with a sheet conferring the surface appearance; the assembly was laminated under pressure and hot; an extremely hard unitary structure is obtained which has a decorative effect.
- the so-called low pressure laminates are produced in a similar manner to that of the high pressure laminates, but the decorative sheet is laminated directly on a particle board or any other basic support.
- the finished sheet which also belongs to the category of decorative papers.
- This sheet of paper which is pre or post impregnated (generally a mixture of latex and melamine-formaldehyde resin) is intended to be glued to a particle board or any other support.
- a laminate is made conductive by the fact that a part of the sheets constituting the core is conductive by incorporation in each sheet of a material electrically conductive such as carbon black, a metal or metallic salts or even conductive fibers.
- an antistatic agent for plastics is described as a conductive pigment obtained by depositing tin or indium on a non-conductive mineral base pigment followed by heating in an oxygen atmosphere to form their oxide.
- the metal oxide is therefore not doped.
- pigments which can be used, numerous pigments are mentioned without specifying any advantage linked to a particular pigment or to a geometric shape of a family of pigments.
- US-A-5071676 describes a conductive pigment which can be used to impart antistatic properties to paper and board.
- This pigment consists of a non-conductive substrate covered with an electroconductive layer of tin oxide doped with antimony, itself covered with a layer giving the pigment an isoelectric point between 5 and 9 in order to facilitate its dispersion.
- the substrate can be any, it is not critical for the invention.
- Application EP-A-415478 describes a colored and conductive pigment usable in laminated papers.
- This pigment consists of a base pigment of rutile titanium dioxide and mixed phase coated with a layer of tin oxide doped with antimony.
- Rutile has a spherical geometric shape, so this pigment is spherical.
- a disadvantage of certain products such as doped polymers is their high price.
- a disadvantage of certain products such as quaternary ammonium salts is that it gives the articles a conductivity too low to have a good flow of electrostatic charges.
- Another disadvantage of conductive salts is that the level of conductivity of the products containing them varies with relative humidity.
- a disadvantage of certain conductive products such as aluminum is the sensitivity to water; in the presence of water a dangerous release of hydrogen takes place. They cannot therefore be easily used in an aqueous medium.
- Drawbacks linked to the use of conductive fibers are, on the one hand, the mottled aesthetic appearance given to paper, in particular with carbon fibers, and on the other hand, the reduction in the physical characteristics of the paper sheet.
- Certain inorganic conductive pigments made conductive by a layer of metal oxide can give a conductivity which is too low to ensure good dissipation of electrostatic charges, especially once used in a paper application.
- the object of the invention is to provide a sheet of paper which has a sufficient level of electrical conductivity giving it antistatic properties.
- a second aim is to provide a sheet having antistatic properties which can be produced entirely in an aqueous medium.
- a third goal is to provide a sheet with properties antistatic that does not vary with relative humidity.
- a fourth aim is to provide a sheet having antistatic properties which has a neutral aesthetic appearance, that is to say that the product which will make the sheet conductive must not or only slightly modify the appearance of the sheet.
- Another object is to provide a sheet having antistatic properties whose mechanical characteristics are good. Another object is to provide a sheet having antistatic properties which has a low cost price.
- the Applicant has found that the aims of the invention are achieved by producing a sheet which comprises conductive pigments having a basic structure of the lamellar type and provided with an electroconductive layer of doped metal oxide.
- the mineral pigments covered with doped metal oxides are known for their electroconductive properties, however the Applicant has found that, for pigments having an electroconductive layer based on the same oxide and for the same dopant, therefore having a priori comparable intrinsic conductivity levels, the sheets of paper containing these pigments have very different final conductivities depending on the basic structure (geometric shape) of the support pigment of the layer - Such results are shown in the attached table 1, the metal oxide doped chosen being tin oxide doped with antimony, this doped oxide is deposited on support pigments of different geometric shapes.
- the conductive pigments were coated in an aqueous medium under the same conditions using the same binder (polyvinyl alcohol PVA) and in the same 1: 1 ratio, on the surface of a sheet of paper.
- the surface resistivity of the sheets was measured according to standard ASTM 257-66 for a relative humidity of 50% (the conductivity of the sheets can be obtained by taking the inverse of the resistivity).
- the level of resistivity desirable for good dissipation of electrostatic charges (less than 10 7 ohms) is only achieved with pigments having a basic structure of the lamellar type (therefore of flat geometric shape); the resistivity is indeed of the order of 10 5 ohms.
- the invention therefore provides a sheet of paper having antistatic properties characterized in that it comprises conductive pigments having a basic structure of the lamellar type and provided with at least one electroconductive layer of doped metal oxide.
- the doped metal oxide is a tin oxide doped with antimony.
- the pigments having a lamellar type structure can be chosen for example from micas, talc, kaolin, bentonites, montmorillionites or glass particles.
- the conductive pigment is a mica coated with a layer of tin oxide doped with antimony.
- the mica pigments covered with a layer of antimony-doped tin oxide have good light transparency, they do not modify the aesthetic appearance of the paper which contains them.
- the conductive pigment is a mica covered with a layer of titanium oxide, optionally with a layer of silica, and coated with a layer of tin oxide doped with l 'antimony.
- These pigments have a . some iridescence but they have little effect on the aesthetic appearance of the paper containing them. It may be advantageous to use them in areas where the decorative effect of iridescence is sought, for example in the area of laminates.
- the conductive pigments can be incorporated en masse during the manufacture of the sheet on the paper machine or be deposited on the surface of the sheet by impregnation in a size press or by any coating means or by impression.
- the conductive pigments are provided in an aqueous medium.
- the sheet is characterized in that it carries, on at least one face, a layer containing at least the said conductive pigments and at least one binder.
- the binder is a binder usually used in stationery such as water-soluble binders, latexes.
- a water-soluble binder such as, for example, polyvinyl alcohols or starches, to obtain an easily repulpable sheet.
- the layer may optionally contain other adjuvants commonly used in stationery such as viscosity regulating agents, for example carboxymethylcellulose, defoamers, etc.
- the quantity of conductive pigments deposited on the surface of the sheet is between 1 and 10 g / m 2 , by dry weight.
- the treated sheet is based on cellulose fibers, it can include other organic fibers (polyethylene, polypropylene, polyester fibers, etc.) or mineral fibers such as glass fibers. It can also include other additives used in stationery such as fillers, bonding agents, binders, wet strength agents, retention agents, anti-foaming agents, viscosity regulating agents, regulating agents. pH etc.
- the invention also provides a flexible abrasive product having antistatic properties which is characterized by the fact that it is supported by said sheet with antistatic properties.
- the abrasive can obviously be in the form of a sheet, but also in other forms such as, for example, continuous tape, disc, etc.
- the sheet used contains the conductive pigments on the surface.
- the conductive pigments can be on the back of the abrasive or on the face carrying the grains, below the adhesive.
- the invention also relates to a decorative sheet obtained from said sheet with antistatic properties.
- the invention also relates to a laminate having antistatic properties which is characterized in that it comprises at least one sheet like the said sheet with antistatic properties. Said sheet can be used as a component of the core of the laminate or as a decorative sheet or possibly as an overlay.
- Said sheet can also be a finished sheet.
- the pigment-binder ratio is 5: 1.
- Samples are produced with different layer weights of conductive pigments (expressed in dry weight in the table below).
- the surface resistivity of each sample is measured according to standard ASTM 257-66 and this at relative humidity levels (noted
- the color of the sheets of paper obtained according to the invention is not changed.
- Samples are produced as in Example 1, but a conductive pigment is used, a mica covered with a layer of titanium oxide then with a layer of silica and finally coated with a layer of tin oxide doped with antimony, the tin / antimony ratio being 85:15.
- This pigment is marketed by
- the leaves have a slight iridescence which has little effect on their aesthetic appearance.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Laminated Bodies (AREA)
- Paper (AREA)
- Polarising Elements (AREA)
- Elimination Of Static Electricity (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9204230A FR2689531B1 (fr) | 1992-04-07 | 1992-04-07 | Feuille antistatique. |
FR9204230 | 1992-04-07 | ||
PCT/FR1993/000310 WO1993020280A1 (fr) | 1992-04-07 | 1993-03-29 | Feuille antistatique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0633964A1 true EP0633964A1 (fr) | 1995-01-18 |
EP0633964B1 EP0633964B1 (fr) | 1998-01-14 |
Family
ID=9428579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93907902A Expired - Lifetime EP0633964B1 (fr) | 1992-04-07 | 1993-03-29 | Feuille antistatique |
Country Status (13)
Country | Link |
---|---|
US (1) | US5677039A (fr) |
EP (1) | EP0633964B1 (fr) |
AT (1) | ATE162250T1 (fr) |
AU (1) | AU661902B2 (fr) |
BR (1) | BR9306198A (fr) |
DE (1) | DE69316346T2 (fr) |
DK (1) | DK0633964T3 (fr) |
ES (1) | ES2111742T3 (fr) |
FI (1) | FI114651B (fr) |
FR (1) | FR2689531B1 (fr) |
MX (1) | MX9302060A (fr) |
NO (1) | NO302248B1 (fr) |
WO (1) | WO1993020280A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013018111A1 (fr) | 2011-08-02 | 2013-02-07 | C.I.M. CALCI IDRATE MARCELLINA SpA | Peinture à l'eau autonettoyante, anti-smog et anti-moisissures à base de matières pulvérulentes ayant des propriétés photocatalytiques |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19511012A1 (de) * | 1994-04-06 | 1995-10-12 | Merck Patent Gmbh | Oberflächenmodifiziertes, leitfähiges Pigment |
DE69902516T2 (de) * | 1998-02-02 | 2003-07-24 | Int Paper Co | Feuchtigkeitsabhängiger statische elektrizität zerstreuender schichtstoff |
US6114079A (en) * | 1998-04-01 | 2000-09-05 | Eastman Kodak Company | Electrically-conductive layer for imaging element containing composite metal-containing particles |
MXPA05003356A (es) * | 2002-10-03 | 2005-10-05 | Metss Corp | Superficies laminadas duras de disipacion de carga electrostatica. |
DE202004002832U1 (de) * | 2004-02-20 | 2005-06-30 | Kronospan Technical Company Ltd., Engomi | Kohlenstoffhaltiges Papier nebst Paneel |
US20090176074A1 (en) * | 2006-05-05 | 2009-07-09 | Meadwestvaco Corporation | Conductive/absorbtive sheet materials with enhanced properties |
DE102008009716B4 (de) * | 2008-02-19 | 2013-08-29 | Nanogate Ag | Verfahren zur Herstellung einer Elektretbeschichtung und die Verwendung der damit hergestellten Beschichtung |
PL2284019T3 (pl) * | 2009-06-22 | 2017-03-31 | Polska Wytwórnia Papierów Wartościowych S.A. | Papier zabezpieczony do grawerowania laserowego, dokument zabezpieczony i sposób wytwarzania dokumentów zabezpieczonych |
JP5389568B2 (ja) * | 2009-08-19 | 2014-01-15 | 富士フイルム株式会社 | 透明導電性フィルム |
ES2772398T3 (es) | 2011-06-21 | 2020-07-07 | Flooring Technologies Ltd | Lámina de revestimiento |
WO2016058003A1 (fr) | 2014-10-10 | 2016-04-14 | Formica Corporation | Matériaux de surfaçage multicouches décoratifs dans lesquels sont incorporés des matériaux conducteurs, surfaces solides ainsi constituées, procédés de fabrication de tels matériaux de surfaçage et leurs usages |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5834861A (ja) * | 1981-08-27 | 1983-03-01 | Ricoh Co Ltd | 導電性顔料の製造法 |
JPS6050813A (ja) * | 1983-08-31 | 1985-03-20 | 触媒化成工業株式会社 | プラスチック又は塗料配合用透光性導電性粉末素材 |
US5071676A (en) * | 1989-08-03 | 1991-12-10 | E. I. Du Pont De Nemours And Company | Electroconductive particles and method for adjusting the isoelectric point thereof |
DE3929057A1 (de) * | 1989-09-01 | 1991-03-07 | Metallgesellschaft Ag | Elektrisch leitfaehiges rutilmischphasen-pigment, verfahren zu seiner herstellung sowie dessen verwendung |
-
1992
- 1992-04-07 FR FR9204230A patent/FR2689531B1/fr not_active Expired - Fee Related
-
1993
- 1993-03-29 AU AU38929/93A patent/AU661902B2/en not_active Ceased
- 1993-03-29 DE DE69316346T patent/DE69316346T2/de not_active Expired - Lifetime
- 1993-03-29 DK DK93907902T patent/DK0633964T3/da active
- 1993-03-29 WO PCT/FR1993/000310 patent/WO1993020280A1/fr active IP Right Grant
- 1993-03-29 US US08/307,792 patent/US5677039A/en not_active Expired - Fee Related
- 1993-03-29 EP EP93907902A patent/EP0633964B1/fr not_active Expired - Lifetime
- 1993-03-29 BR BR9306198A patent/BR9306198A/pt not_active IP Right Cessation
- 1993-03-29 AT AT93907902T patent/ATE162250T1/de not_active IP Right Cessation
- 1993-03-29 ES ES93907902T patent/ES2111742T3/es not_active Expired - Lifetime
- 1993-04-07 MX MX9302060A patent/MX9302060A/es not_active IP Right Cessation
-
1994
- 1994-10-05 FI FI944645A patent/FI114651B/fi active IP Right Grant
- 1994-10-06 NO NO943756A patent/NO302248B1/no unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9320280A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013018111A1 (fr) | 2011-08-02 | 2013-02-07 | C.I.M. CALCI IDRATE MARCELLINA SpA | Peinture à l'eau autonettoyante, anti-smog et anti-moisissures à base de matières pulvérulentes ayant des propriétés photocatalytiques |
WO2013018059A2 (fr) | 2011-08-02 | 2013-02-07 | C.I.M. Calci Idrate Marcellina S.P.A. | Peinture à base d'eau en poudre photocatalytique autonettoyante, anti-smog et antimoisissure |
US9901914B2 (en) | 2011-08-02 | 2018-02-27 | Am Technology Limited | Self-cleaning, anti-smog, anti-mould photocatalytic powdered water based paint |
Also Published As
Publication number | Publication date |
---|---|
NO943756L (no) | 1994-12-01 |
FI944645A (fi) | 1994-10-05 |
AU661902B2 (en) | 1995-08-10 |
FR2689531A1 (fr) | 1993-10-08 |
WO1993020280A1 (fr) | 1993-10-14 |
NO302248B1 (no) | 1998-02-09 |
FI114651B (fi) | 2004-11-30 |
DK0633964T3 (da) | 1998-09-14 |
FI944645A0 (fi) | 1994-10-05 |
MX9302060A (es) | 1994-07-29 |
ATE162250T1 (de) | 1998-01-15 |
US5677039A (en) | 1997-10-14 |
AU3892993A (en) | 1993-11-08 |
DE69316346T2 (de) | 1998-05-14 |
DE69316346D1 (de) | 1998-02-19 |
EP0633964B1 (fr) | 1998-01-14 |
NO943756D0 (no) | 1994-10-06 |
FR2689531B1 (fr) | 1994-12-23 |
BR9306198A (pt) | 1998-06-23 |
ES2111742T3 (es) | 1998-03-16 |
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Legal Events
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