EP0794980A1 - Magnetic coating composition - Google Patents
Magnetic coating compositionInfo
- Publication number
- EP0794980A1 EP0794980A1 EP95939175A EP95939175A EP0794980A1 EP 0794980 A1 EP0794980 A1 EP 0794980A1 EP 95939175 A EP95939175 A EP 95939175A EP 95939175 A EP95939175 A EP 95939175A EP 0794980 A1 EP0794980 A1 EP 0794980A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating composition
- magnetite
- composition according
- magnetic
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
Definitions
- This invention relates to a magnetic paint for application to walls, partitions, building materials and the like and to walls coated with the magnetic paint.
- the invention also relates to magnetic building materials.
- magnetic means capable of attracting a magnet.
- the present invention is based on the novel concept that if one or more walls of a room could be painted with a magnetic paint it would be possible to removably attach posters and the like by means of magnets without the use of tacky substances, nails or other devices which impair the surface finish of the wall. Moreover, magnetic walls would also afford opportunities for creative expression and play by facilitating the movement, attachment or detachment of magnetized shapes on to or from the magnetic wall surface without damage to the surface.
- Magnetic blackboards have been prepared by application of a resin to the surface and then dusting with an iron powder prior to curing of the resin. This system is messy to apply and results in a rough surface texture.
- Magnetic paint comprising magnetite incorporated into an oil base admixed with drying oils and solvent thinners is also known. Such paint has not been considered suitable for use on walls for a number of reasons. Generally, in order to achieve a sufficiently-high magnetic attraction, a heavy loading of a magnetic material is required. It is difficult to maintain stable suspensions at a satisfactory loading without grinding the pigment to a very small particle size, preferably less than one micron.
- Magnetite is a jet black pigment and while paints with a high loading of magnetite are suitable for coating blackboards they are unsuitable for use in coating large areas of wall, for example in a child's nursery, or even for use as an undercoat to a light-coloured paint. This problem is exacerbated by grinding the magnetite to improve its suspension stability. Furthermore, the use of organic solvents and thinners renders the application and clean-up of such paints inconvenient and environmentally unpleasant. In contrast to use for a blackboard, a surface coating suitable for use in interior decorating must combine an acceptably light colour and smooth surface texture with sufficient durability, rub resistance, colour stability, shelf stability, and ease of application.
- the coating should be rust and stain resistant and should have a rheology which facilitates application by brush or roller, among other desiderata. Hitherto, surface coatings which provide sufficient magnetic attraction to retain magnets have had properties incompatible with one or more of these requirements of an interior decorative coating.
- the invention consists in a coating composition
- a coating composition comprising a film forming resin emulsion, and a magnetic material dispersed in the emulsion in a proportion such that a dry cured coating of the composition on a non ⁇ magnetic substrate is capable of holding a magnet by magnetic attraction when vertical.
- the magnetic material is magnetite and is dispersed in the aqueous phase of the emulsion.
- the magnetite is present in a quantity such that a 50 x 50 mm flexible magnet will not only remain attached to a vertical or inverted dried film of the composition, but will also support in excess of 25 g, more preferably in excess of 30 g, against gravity.
- compositions according to the invention typically have in excess of 40% by weight, and often in excess of 50% by weight of a selected magnetite.
- the invention consists in a coating composition
- a coating composition comprising a film forming resin emulsion, a white or light coloured pigment, and magnetite dispersed in the emulsion in a proportion such that a dry cured coating of the composition on a non-magnetic substrate is capable of holding a magnet by magnetic attraction.
- the pigment is titanium dioxide and is present in a weight ratio of from 10:1 to 2:1 (magnetite: titanium dioxide) and more preferably about 3.5:1 to 7:1.
- Coating compositions according to the invention comprise a film forming resin binder for example an acrylic or vinyl paint resin emulsified in water.
- a film forming resin binder for example an acrylic or vinyl paint resin emulsified in water.
- an acrylic or vinyl paint and preferably an acrylic or vinyl undercoat paint of the type readily available commercially, may be used.
- the coating is formulated based upon resin emulsions such as water-borne urethane; water-borne epoxy; vinyl acetate/dibutyl maleate co-polymer and polymers of other vinyl esters; water-borne alkyd; styrene (meth) acrylic copolymers; polymers of fumaric and maleic esters; styrene maleic anhydride resins; polymers of hydrocarbons e.g.
- the preferred magnetic material to be dispersed in the emulsion is a crushed and sieved naturally occurring magnetite which generally comprises at least 95% of Fe3 ⁇ 4 and having a magnetic susceptibility at 800 OERSTEDS of not less than 0.05 e.m.u./oe/g.
- materials such as pyrrhotite, hematite, garnet, rutile, omphacite, ilmenite, and gamma iron oxide may also be used.
- the magnetic holding weight of a tile is determined by means of a flexible fridge magnet (50 x 50 mm) which is magnetically attracted to the surface and to which a chain and pan apparatus is attached.
- the tile is clamped with the coated surface in a pe ⁇ endicular plane and weights are added to the pan suspended from the magnet.
- a successful "lift” is recorded if the weight does not move for a minimum of 30 seconds.
- the maximum weight which can be supported in this way per unit weight of coating is reported as "magnetic attraction" ("MA").
- Particle size of the magnetite was found to have no significant effect on magnetic attraction. However, particle size of the magnetite had a noticeable effect on colour, the colour being lightest at a magnetite particle size such that 65% - 75% is less than 53 microns ("medium”), becoming darker with grinding to 85% - 90% less than 53 microns ("Fine”), darker still at 90% to 95% less than 53 microns ("super fine”) and being very dark at 95% - 99% less than 53 microns (average less than 45 microns "ultra fine”). Magnetite having 99% - 100% less than 53 microns (average approximately 0.2 microns "Ultra ultra fine”) was black with very high colour strength.
- the water is charged to a tank. D, G, E and B are added with slow stirring. Preground F is then dispersed in the water using high shear dispersion. Subsequently, ammonia is added and the resin emulsion H together with stabilizers and fungicide are added as required.
- the resulting composition has 56.06% solids and an S.G. of 1.71 and PVC 80.8.
- Example 1 when applied to a surface as a paint and allowed to dry gives satisfactory magnetic attraction. Typical Magnetic Attraction values in excess of 20 gms were obtainable at normal coating thickness (260 g/sq.m wet film, one coat). It was found to be desirable that the emulsion composition has a high specific gravity since that allows a substantially higher weight of the coating to be applied to a surface and therefore improves the magnetic attraction.
- the water miscible composition is stable, dries to provide a coating which is usefully magnetic without impurities of the ferric oxide exhibiting rust-staining, and is suitable for use as an undercoat for a conventional wall interior decorating paint.
- the coating of Example 1 however, is of a dark colour and thus is not generally suitable for use as a top coat. Moreover it is darker than desirable for use as an undercoat.
- Samples A-X were formulated as shown in Table 2 and prepared in a manner similar to formulation 1 , the titanium dioxide being preground and added with or after the magnetite. — — —
- Sample G is a blend of two parts by weight magnetite to 1 part by weight of the commercially available acrylic white paint X.
- Samples C and D have an acceptable magnetic attraction and colour while samples E and F are of poor magnetic quality.
- Coating G while magnetic, is very dark, presumably because the commercial paint base contains non-opacifying fillers rather than or in addition to titanium dioxide. At least 30% of magnetite appears to be required for sufficient magnetic attraction.
- Table 5 shows the effect of increasing PVC on rub resistance for a paint according to the invention having a magnetite to titanium dioxide ratio of 4.8:1. Dry rub resistance was measured by rubbing two squares face to face and recording the number of rubs when the substrate shows through.
- Critical PVC is defined as the pigment volume concentration at which weight loss with rubbing exceeds 30%.
- Table 5 shows that at a PVC of above 81.5% there is a large and sudden failure in wet and dry rub resistance. This was unexpected as samples using magnetite without titanium dioxide can be made without apparent binding problems at 88% PVC. Likewise comparative formulation G using an acrylic emulsion (e.g. Rohm and Haas E 2300) at various solids % but without magnetite exhibit excellent rub resistance at PVCs above 80% (Table 6). Paint Y & Z in Table 6 are commercially available white paints.
- an acrylic emulsion e.g. Rohm and Haas E 2300
- Paints according to the second aspect of the invention are especially suitable for use as an undercoat by virtue of their relatively light colour. Paints according to the invention are desirably formulated with a high viscosity and S.G. in comparison with commercially available undercoat and top coat paints intended for interior decoration. This facilitates liberal application and results in an optimum coating weight in one coating. Formulations such as L & M (Table 2) provide an exceptionally good undercoat on unsealed surfaces such as plasterboard, provide high surface loadings, and are easily applied at an effective coating weight.
- polyacrylates polyvinyl pyrrolidone, modified polyvinyl ether-maleic anhydride, other hydrophobic alkali soluble emulsions (HASE), hydrophobic ethoxylated urethane resins (HEUR), gelatin, natural gums, casein, alginates, starch and starch derivatives such as hydroxyethyl cellulosics, carboxymethyl cellulose and quaternised ammonium substituted cellulosics.
- HASE hydrophobic alkali soluble emulsions
- HEUR hydrophobic ethoxylated urethane resins
- gelatin natural gums, casein, alginates, starch and starch derivatives such as hydroxyethyl cellulosics, carboxymethyl cellulose and quaternised ammonium substituted cellulosics.
- inorganic thickeners such as fumed silicas, sodium magnesium silicates, etc., may be inco ⁇ orated.
- the magnetite is inco ⁇ orated into a building panel for example a plaster board wall panel.
- This slurry was applied in various film weights to a pre-cast mould containing formed plaster.
- the plaster is reduced in strength by using this loading level (64% of magnetite in final dry plaster).
- This loading level (64% of magnetite in final dry plaster).
- Example 4 Inco ⁇ oration into Cement Render
- Various loadings of magnetite in a cement render base sand/cement 340g, lime 200g, water lOOg
- sand/cement 340g, lime 200g, water lOOg were assessed for magnetic strength by casting lOOg of the above mix containing magnetite into a 11cm diameter mould.
- Magnetic walls and walls coated with magnetic paint as herein described facilitate attachment of sheets of paper, for example maps, posters and the like which may be clamped to the wall by means of magnets, for example fridge magnets, ferrite magnets or bar magnets. Alternatively, magnets of various shapes, colours and sizes may be attached as decorations of the wall.
- the invention extends to the use of magnetized paper or magnetized film which may be attached by magnetic attraction directly to the magnetic wall or magnetic paint.
- the magnetized paper or film may be in roll form, or sheet form, or may be in cut shapes, for example die-cut patterns for use as decoration or forming puzzles or games on the wall.
- die-cut magnetized farmyard animal shapes may be attached to a wall coated with the magnetic paint herein described or "Naughts and Crosses" may be magnetically attached.
- Magnetized wall- paper or friezes may be attached to a magnetic wall according to the invention.
- the magnetized film may for example be manufactured from a plastics material inco ⁇ orating magnetized and aligned ferrite or from a film or paper coated with a ferrite-in-resin coating in which the ferrite is aligned in a magnetic field as the coating is cured.
- a magnet is coated on one side with a low tack high cohesive film which produces a "peel and stick” surface.
- a magnetized backing may be clamped to the magnetic wall and the exposed "peel and stick” surface may be used removably to hold sheets of paper or the like to the wall in a manner which does not obscure any part of the exposed surface of the sheet.
- pigments other than titanium dioxide can be inco ⁇ orated in paints embodying the inventive concept with suitable adjustment to the formulation.
- Various paint additives of the kind known in the art may be added to improve mould resistance properties in a conventional manner for example, flow surfactants, mould inhibitors and the like.
- the formulations may be varied to an extent without departing from the scope hereof.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPM9819/94 | 1994-12-02 | ||
AUPM9819A AUPM981994A0 (en) | 1994-12-02 | 1994-12-02 | Magnetic coating composition |
PCT/AU1995/000809 WO1996017022A1 (en) | 1994-12-02 | 1995-12-01 | Magnetic coating composition |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0794980A1 true EP0794980A1 (en) | 1997-09-17 |
EP0794980A4 EP0794980A4 (en) | 1998-12-30 |
Family
ID=3784329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95939175A Withdrawn EP0794980A4 (en) | 1994-12-02 | 1995-12-01 | Magnetic coating composition |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0794980A4 (en) |
AU (1) | AUPM981994A0 (en) |
NZ (1) | NZ296483A (en) |
WO (1) | WO1996017022A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1368910A (en) | 1999-06-16 | 2002-09-11 | 邦尼·罗奇 | Display devices accessories therefor and methods |
AU2002344928A1 (en) * | 2002-04-22 | 2003-11-03 | Wolfgang Kunzweiler | Magnetisable surface coating |
GB0415892D0 (en) * | 2004-07-16 | 2004-08-18 | Creative Resins Distrib Ltd | A method of laying a floor covering |
NL1032153C2 (en) * | 2006-07-12 | 2008-01-15 | Vogel S Holding Bv | Set is for production of projection screen on basic surface and is provided with at least a magnetic strip and magnetic paint, strip in operation limiting four sides of projection field |
US20190323234A1 (en) * | 2016-10-18 | 2019-10-24 | Yoshino Gypsum Co., Ltd. | Gypsum-based building material with magnetic layer, magnetic joint material, method for fabricating gypsum-based building material with magnetic layer |
JP7246642B2 (en) * | 2019-10-29 | 2023-03-28 | ニチレイマグネット株式会社 | White water-based magnetic paint and white magnetic sheet using the same |
JP6960124B2 (en) * | 2020-03-05 | 2021-11-05 | ニチレイマグネット株式会社 | Color magnetic sheet and color magnetic surface using color water-based magnetic paint |
JP7022966B2 (en) * | 2020-03-17 | 2022-02-21 | ニチレイマグネット株式会社 | Magnet sheet and magnet surface using water-based magnet paint |
CN112517236A (en) * | 2020-11-23 | 2021-03-19 | 连云港金红矿业有限公司 | Garnet concentrate recleaning process |
JP7490200B2 (en) * | 2021-03-02 | 2024-05-27 | ニチレイマグネット株式会社 | Nd magnetic powder-containing aqueous coating composition and magnetic surface and magnetic sheet using the same |
JP7385871B2 (en) * | 2021-03-02 | 2023-11-24 | ニチレイマグネット株式会社 | Water-based magnetic coating composition, magnetic surface and magnetic sheet using the same |
DE102022117132A1 (en) * | 2022-07-08 | 2024-01-11 | Gottlieb Binder Gmbh & Co. Kg | Fastening system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS518124B1 (en) * | 1971-07-24 | 1976-03-13 | ||
CH608029A5 (en) * | 1978-01-25 | 1978-12-15 | Ernst Meyer | Process for the preparation of a melting composition which, in bound form, firmly holds permanent magnet elements |
JPS57207655A (en) * | 1981-06-17 | 1982-12-20 | Tokyo Jiki Insatsu Kk | Preparation of water-based emulsion paint |
GB2102405B (en) * | 1981-07-24 | 1985-10-23 | Paul Henry Elcock | Materials for providing wall and ceiling surfaces |
JPS5880365A (en) * | 1981-11-09 | 1983-05-14 | Tokyo Jiki Insatsu Kk | Aqueous magnetic paint composition |
WO1994022151A1 (en) * | 1993-03-15 | 1994-09-29 | Henkel Kommanditgesellschaft Auf Aktien | Composition containing iron powder as a magnetically active ingredient plus a binder |
-
1994
- 1994-12-02 AU AUPM9819A patent/AUPM981994A0/en not_active Abandoned
-
1995
- 1995-12-01 WO PCT/AU1995/000809 patent/WO1996017022A1/en not_active Application Discontinuation
- 1995-12-01 NZ NZ296483A patent/NZ296483A/en unknown
- 1995-12-01 EP EP95939175A patent/EP0794980A4/en not_active Withdrawn
Non-Patent Citations (4)
Title |
---|
DATABASE WPI Section Ch, Week 7615 Derwent Publications Ltd., London, GB; Class A14, AN 76-27628X XP002083355 & JP 51 008124 B (UNION CARBIDE CORP) , 13 March 1976 * |
DATABASE WPI Section Ch, Week 8305 Derwent Publications Ltd., London, GB; Class A21, AN 83-11216K XP002083356 & JP 57 207655 A (TOKYO JIKI INSATSU KK) , 20 December 1982 * |
DATABASE WPI Section Ch, Week 8325 Derwent Publications Ltd., London, GB; Class A85, AN 83-60073K XP002083357 & JP 58 080365 A (TOKYO JIKI INSATSU KK) , 14 May 1983 * |
See also references of WO9617022A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1996017022A1 (en) | 1996-06-06 |
EP0794980A4 (en) | 1998-12-30 |
NZ296483A (en) | 1998-10-28 |
AUPM981994A0 (en) | 1995-01-05 |
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