AU781075B2 - Noctilucent or fluorescent artifial stone - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant: DOPPEL CO., LTD Invention Title: NOCTILUCENT OR FLUORESCENT ARTIFICIAL STONE The following statement is a full description of this invention, including the best method of performing it known to us: NOCTILUCENT OR FLUORESCENT ARTIFICIAL STONE TECHNICAL FIELD The invention of this application is one relating to noctilucent or fluorescent artificial stone. More particularly, the invention of this application is one relating to artificial stone having noctilucent properties such as light storing properties or light emitting properties accompanied by ultraviolet rays absorption useful for building material, scene material; etc. as guide of direction indication or position by light at night decorating properties, dark field environment.

BACKGROUND ART Hitherto, artificial stone is known, crushing natural stone, mixing this with resin etc. grinding hardening. And, regarding this artificial stone, devices have been carried out variously to make it one having natural stone taste of marble, granite, etc., and furthermore superior in hardness, strength, too.

As one attempt of function, performance improvement of artificial stone like this, adding optical function using noctilucent substance of light storing material, fluorite substance shining with the stored light etc. or fluorescent substance of ultraviolet rays light emitting material etc.

emitting light accompanying ultraviolet rays absorption has been proposed. This attempt, mixing solidifying resin component as binder of artificial stone with fluorescent substance, or mixing solidifying unsaturated polyester, methacrylic resin, glass, etc. with light storing fluorescent substance or ultraviolet rays fluorescent substance of strontium aluminate, etc., is performed as constituting artificial stone using crushed one of this as aggregate.

However, in the case of conventional noctilucent, fluorite shining or fluorescent artificial stone, the one that light storing material etc. functions even by any method mentioned above is only at the arranged part of binder resin component or aggregate exposed to the surface part of artificial stone, there was disadvantage that light storing material etc. contained inside the forming body of artificial stone does not function at all. Fluorescent material of light storing material etc. is very expensive, since even addition of small quantity raises the total cost of artificial stone product to about 3~10 times, conventional artificial stone containing inside fluorescent substance not working like this is not practical costwise, there is the disadvantage that since its light emission also remains in the surface layer part of artificial stone, the thickness of light emission cannot be obtained, there was a problem that its application is extremely limited by high cost and restriction of light emission performance like this.

On the other hand, if addition amount is suppressed for cost reduction, it follows that a trouble occurs that the function effect of light emission or light storing is rarely obtained.

Therefore, in order to improve the light function of artificial stone, the realization of new artificial stone superior in its function effect, being capable of obtaining sufficiently the thickness of light emission of artificial stone, not merely surface, by the use of less noctilucent or fluorescent substance of light storing material etc. for cost reduction, has been hoped for.

11/03/2005 10:09 GRIFFITH HACK 4 00262837999 NO.373 000e DISCLOSURE OF INVENTION According to an aspect of the present invention there is provided a noctilucent or fluorescent artificial stone, the artificial stone comprising an inorganic aggregate and a resin, wherein the inorganic aggregate contains a transparent inorganic aggregate with a coating layer of a noctilucent or fluorescent substance baked or coated onto the surface of the transparent inorganic aggregate, and the artificial stone contains 5 65 wt% of the transparent inorganic aggregate.

Preferably, the transparent inorganic aggregate is glass or silicastone.

Preferably, 20 to 80 wt% of the inorganic aggregate is the transparent inorganic aggregate with the 15 coating layer of noctilucent or fluorescent substance baked onto or coating its surface.

Preferably, the resin is methacrylic resin.

:Preferably, the inorganic aggregate comprises a small particle component of 5 to 70 mesh and a fine 20 particle component of less than 100 mesh, and at least part of the small particle component is the transparent inorganic aggregate with the coating layer of a S. 99 o S •noctilucent or fluorescent substance baked onto or coating its surface.

Preferably, 10 to 100 wt% of the small particle :component is the transparent inorganic aggregate with the coating layer of a noctilucent or fluorescent substance baked onto or coating its surface.

Preferably, the weight ratio of the small particle component to the fine particle component is 1:1 4:1.

Preferably, the thickness of the coating layer of the noctilucent or fluorescent substance is 5 to 50 pm.

Preferably, the amount of the resin is less than 15 wt%.

Preferably, the amount of the resin is less than wt%.

COMS ID No: SBMI-01160169 Received by 1P Australia: Time 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 NO.373 0009 4 BRIEF DESCRIPTION OF DRAWINGS Fig. 1 of the attached drawing is a sectional view which illustrates the construction of a preferred embodiment of an artificial stone in accordance with the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION By way of example only, a description of a preferred embodiment is given in more detail below.

As the composition of artificial stone, in this preferred embodiment, as the basic component, it contains S: inorganic aggregate and resin. And, that at least part of incorporated inorganic aggregate is transparent inorganic 15 aggregate having surface coating layer consisting of noctilucent or fluorescent substance, its ratio is 5-65 wt% of the total amount of artificial stone composition.

In the case of this ratio less than 5 wt%, sufficient light emitting properties, particularly, good 20 light emission thickness is not obtained. And, in the case of exceeding 65 wt%, it is not economical in relation to p light emitting properties.

Regarding inorganic aggregate itself, it may not be only the transparent one, but in general, of inorganic 25 aggregate incorporated, more than 5 wt%, preferably 10-90 wt%, further 20-80 wt%, should be transparent inorganic aggregate coated with noctilucent, fluorite shining or fluorescent substance.

Incidentally, as division by the size (particle diameter) of inorganic aggregate, the following two kinds are exemplified as a preferred embodiment. That is, one is inorganic small particle component of the size of 5-70 mesh as the main component, this is adequate inorganic small particle component selected from minerals of silicastone, olivine, feldspar, pyroxene, and mica, etc., natural stone of granite metamorphic rocks, etc., porcelain, glass, metal, etc.

Rt\Sb ry1\reecp\Spec1P4A56B3 .doc 10/03/03 COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 NO.373 0010 5 And, together with this small particle component, fine particle component of less than 100 mesh is preferably used. As this fine particle component, natural or artificial fine particle component of various kinds is enumerated. For example, calcium carbonate, aluminum hydroxide, silicastone powder, etc. are fine particle component to be obtained easily.

Also, as part of this fine particle component, it is permissible to add incorporate component of manganese dioxide, titanium dioxide, zirconium silicate, iron oxide etc. for the adjustment of color tone, or component of antimony trioxide, boron compound, bromine compound, etc.

to impart flame retardance/nonburning properties.

The above-mentioned small particle component i 15 functions as a principal factor to the appearance and physical properties of artificial stone to be obtained.

Exposing part particularly, combined with other components, it becomes a principal factor of color and pattern on appearance.

And, regarding this small particle component, in S" this preferred embodiment, the small particle with at ge*: least its part being transparent is preferred as the small particle which is baked or normal temperature coated with noctilucent substance of light storing properties, 25 fluorite substance shining with the stored light etc. or fluorescent substance having light emitting properties •accompanied by ultraviolet rays absorption on its surface.

In other words, part or entire amount of small particle component is preferred to be transparent inorganic aggregate whose surface is coated with noctilucent substance or fluorescent substance. As small particle component as inorganic aggregate with transparent light like this, glass and silicastone etc. are exemplified as adequate ones.

Regarding small particle component to be incorporated into composition, it is desirable to make the ratio (weight) of its 10-100% transparent inorganic H:\SttrylHM\Oep\$Qci\4(6l.doc i/102105 COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK< 4 00262837999 NO.37?3 0011 aggregate having surface coating layer of the abovementioned noctilucent substance or fluorescent substance.

Also, the fine particle component is one which is considerably smaller than 100 mesh in comparison with the small particle component, takes position so as to enter between individual particles of small particle component, filling space between particles, contributes to obtaining such properties as hardness and flexibility of artificial stone obtained. It Is preferable to make the small particle component and this fine particle component 0.3:1 5 1, further 1 :1 -4 ;1 in its weight ratio.

Also, the resin component can select in broad *range among from thermosetting ones.

For example, acrylic resin, methacrylic resin, unsaturated polyester resin, etc. are exemplified. Of .9these, methacrylic resin is exemplified as being adequate *from the standpoint of hardness, strength, etc. It is desirable that the formulation ratio of resin component is less than 15 wt%, further not higher than 10 wt% of the :20 composition in all. This resin component has functions to 0..0 wrap these for small particle component being component to 0..0.0form the above-mentioned skeleton and fine particle .0 component, to contribute to combining the whole, to impart elasticity or tensile Btrength to the product when 0: 25 artificial stone has been completed.

Therefore, use amount ratio of inorganic 0 aggregate consisting of small particle component and fine particle component is preferably restricted. That is, it should desirably be not lower than 85%, preferably not lower than 90%, in weight ratio. Incidentally, if it exceeds 95%, the product becomes brittle and it is only possible to obtain the one hard to use. Also, if it is less than 85%, the product is so soft that stone-like properties are not obtained, the use range undesirably becomes the same range as resin plates.

This implies that the one other than small particle component and fine particle component of natural H.\erLN\Kep\SVeci\P4503. doe ~/3o COMS ID No: SBMI-01160169 Received by IP Australia: Time (I-Pm) 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 NO.373 0012 -7 stone etc., that is, resin component should desirably not exist in excess of weight ratio 15% at most in the product.

If resin component exceeds 15% or so, the product becomes plastic-like, artificial stone merely becomes nominal appearance any longer. Also, reducing resin component excessively has the side of increasing appearance properties close to natural color of the product but the product becomes the brittle one, becomes unsuitable for use. From this point of view, more preferably, resin component should be 3-10 wt%.

In a preferred embodiment of this invention, the constitutional ratio of these components is important.

S: What is particularly important is the constitutional ratio with the resin component and other components. It is possible to make high density product having compact •structure. High density here means that small particle component and fine particle component contained in artificial stone product exist at high density, its degree 20 for example exceeds the range contained in conventional artificial stone, such as higher than density 2.2 g/cm 3 And, in this preferred embodiment, at least part of small particle component which is skeleton component is baked or normal temperature coated by noctilucent 06 25 substance or fluorescent substance as mentioned above.

In transparent inorganic aggregate, particularly baked coating of small particle component, it is made such that the particle surface of transparent small particle component is coated with several pm, for example, 5-50 pm, more preferably 20-40 pm or so is carried out. To be more concrete, it is possible to carry out coating by baking at high temperatures of 120-1200 0 C or so.

As noctilucent substance, fluorite substance or fluorescent substance to be baked, it may be selected from the group comprising of noctilucent substances or fluorite substances shining with the stored light and fluorescent substances emitting light by ultraviolet rays irradiation H.\Shrylnf\K0.p\gptci\456$3.4oC 10/03/05 COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 N0.373t or light absorbing properties such as strontium aluminate, zinc sulfate, etc.

Baking is not conventionally known various methods, it is possible to mix, dry, bake transparent inorganic aggregate, for example, the above-mentioned smail particle component in dispersion solution or paste in which one-has dispersed, for example, powder granules of light storing material of strontium aluminate etc.

In coating by normal temperature coating, it is coated also by using transparent sticky substance (binder) for the above-mentioned dispersing solution or paste.

Incidentally, as mentioned above, it is desirable to make the size of inorganic small particle component a :specific one. That is, inorganic small particle component should be the size of 5-70 mesh as mentioned above. In the case one wants to add color densely up or down, using the *.one having color and the one having no color, it is conceivable to use changing the Size of small particle by the presence or absence of color, the large amount use of :20 the one having an extreme difference should not be used because it deteriorates the strength of product.

On the other hand, the size of particles of fine *particle component is preferably less than 100 mesh as mentioned above. it should be one to sufficiently enter between particles of small particle component. To be more concrete, those of 150 to 250 mesh are preferable.

However, this invention is not restricted to composition to formulate inorganic aggregate divided into small particle component and fine particle component as 3D mentioned above.

Incidentally, what is important in high density artificial stone of this invention, except for special cases, it is desirable that these inorganic aggregate components are uniformly dispersed in any part of the product.

And, it is desirable that the external surface of product is polished or roughened. In practice, it is 3:\l~el.U\~(~p\p~c\P4E8-doe 1O/fl/05 P01 3 COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11 11/03/2005 11/032005 10:09 GRIFFITH HAICK 4 00262237999N.73 Q4 NO. 3?3 0014 preferable to make it such that broken small particle component is exposed.

Polishing is practical convenient method to surface expose the, dense structure state the high density artificial stone with depoth feel of this invention possesses. of course, it is possible to polish part of the surface of product, Gxposing small particle component, to use as a pattern the difference between other part of the same surface.

Also, in the case of obtaining artificial stone, it is an important problem to make any one the intended color tone or design properties. Granite or marble becomes :one target because it is difficult to obtain product from *0 00 :000 natural ones and the color luster is beautiful. In this .15 invention, using transparent one as small particle 00.0 :0:06component, it is possible to obtain the one having luster 00 0 .9 of granite tone or marble tone, etc. Because it is *.00 possible to use small particles obtained by crushing 06 quartz-based natural stone as small particle component.

.00 20 Small particles obtained by crushing quartz-based 0.00 natural stone is colorless and transparent in many cases.

Even in the case of not transparent, there are many which 00 00o leave some transparency.

.00 :By adding inorganic dye, or organic pigment of 00 000S.:25 azo pigment, phthalocyanine pigment, etc., or various dyes, it is possible to cause to have unique color tone having uniform color, depth, and luster.

Incidentally, in the artificial stone composition of this preferred embodiment, it is also possible to impart color to the product, mixing and using the particulate colored one of the approximately same size of small particle component as color component.

In any way, it is possible to easily secure the reproducibility of color as compared with conventional artificial stone, and an artificial stone without colorchange, superior in depth and luster may be obtained.

The high density artificial stone of this COMS ID No: SBMI-01 160169 Received by IP Australia: Time 11:12 Date 2005-03-11 1.1/03/2005 10:09 GRIFFITH HACK 4 00262837999 NO. 373 P01S 10 preferred embodiment having light storing properties and ultraviolet ray light emitting properties as well as superior color tone in normal may be made arbitrarily rod- 1ike, cylinder-like etc. in its shape.

0@ 0@ S 0 P *00 S 0@ OS S S 0 0 000 0 00 0 0 S S 0 5* 5 0 000 0 00 @0 5 0 0 0 0@ *0 S 0 0 000 S 0500 0 5000 00 @0 0 0 0.

0 0 0000 0 5.5.55

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eSOSSe M:s~ierY2J4\Keep\np0CAP456S3 5.40 d10,j03/OS COMS ID No: SBMI-01 160169 Received by IP Australia: Time (i-tm) 11:12 Date 20D5-03-11 nozzle, fabrication mode, etc. Usually, in the case of thickness of 2-20 cm, it is possible to make it a hydraulic pressure of 50-1400 kg/cm 2 from the height of the nozzle of 2-50 cm or so. This pressure becomes a water pressure condition lower than the case where natural stone is an object.

After all, by the presence of the resin component, the fabrication with high quality becomes possible more easily.

Regarding the nozzle and its system to jet high-pressure water, there are no specific restrictions. Those of various kinds are adopted.

By this surfacing fabrication, flattening or roughening by water jet is realized, and artificial stone having texture with deep feel is produced.

By the presence of the resin component, without the surface becoming whitened, and as compared with the etching method using chemicals, the disposal of waste liquid also becomes easy.

Of course, according to need, it is possible to treat the surface part by organic solvent, soften or melt and partly remove the resin component.

As the organic solvent in this case, it is permissible to select in response to the resin component to use, for example, halogenated hydrocarbon such as methylene chloride, methylene chloride, chloroform, etc., carboxylic acid and its ester compound such as acetic anhydride, ethyl acetate, butyl acetate, etc., or acetone, tetrahydrofuran, DMF, DMSO, etc. are exemplified.

The forming body is immersed in these organic solvents or sprayed or poured with these organic solvents so that the softened or melted resin component is removed from the surface part, thus it is possible to form surface irregularities.

Or also, it is permissible to form irregularities in such a way as to scrape from the surface part the resin component whose hardness is low by wire brush, grinding means, etc.

After roughening and surface fabrication by the abovementioned various means, by polishing the surface as mentioned above, the coating layer of small particle component of surface is partly broken, this coating layer and particles of small particle component are caused to expose as a cross section on the surface part of the product. By this, surface texture with unique depth and luster is realized. This is attributable to the unique reflection phenomenon of light as mentioned above.

The means for surface polishing is not specifically limited, it is possible to perform using tools such as grind stone, abrasive cloth, abrasive belt, or using abrasive material of buff abrasive material, rubbing compound, etc.

As the abrasive material, diamond, boron carbonate, corundum, alumina, and zirconia which perform mainly grinding action, and tripoly, dolomite, alumina, chromium oxide, cerium oxide, etc. which perform mainly polishing action, are properly used.

Of course, after performing polishing like this, it is permissible to further roughen the surface part and form irregularities. However, in this case, too, as mentioned above, it should be done that particle of at least part of small particle component and the cross section of its coating layer expose.

By doing in this way, too, artificial stone having superior light emitting properties as well as superior skin and texture is manufactured.

Fig. 1 is a sectional view illustrating an embodiment of an artificial stone of this invention. For example, as Fig. 1 showed, artificial stone is constructed of small particle component as transparent inorganic aggregate, fine particle component of smaller particle diameter, and resin component as binder.

To the surface of small particle component light storing or ultraviolet ray light emitting substance is baked coated, the surface of artificial stone is polished.

In this construction, the light irradiated from outside reaches the bake coating substance inside, and in the case of using as resin component methacrylic resin (MMA resin) superior in transparency, it follows that light is incident to all regions of the thickness direction of artificial stone (1) Therefore, it follows that incident light infiltrates to its inside and light emission from inside results. After all, the absorption layer of light and the light emitting layer become thick. Therefore, light storing in a short time becomes possible and light emitting efficiency becomes large.

Sine the coating is only on the surface of small particle component, it follows that the use amount of noctilucent or fluorescent substance suffices in small amount.

In the following, we will explain examples. Of course, this invention is not limited by the following examples.

EXAMPLES

Example 1 Previously, using as 50 wt% of the total small particle component natural silicastone of particle diameter 10-25 mesh provided in a thickness of about 30 pm with the surface baking layer at about 1000*C using strontium aluminate-based light storing material, small particle component and calcium carbonate of average particle diameter 230 mesh in its weight ratio 2:1, so that it becomes 89 wt% of the composition total weight, uniformly mixed into mortar state together with methyl methacrylate (MMA) of 11 wt% containing hardening agent of about 1.5 wt% of MMA weight.

Casting this composition into a mold frame, formed into a plate-like body of thickness about 15 mm.

Then, polished the surface part using diamond-based grindstone and silicon carbide-magnesia-based grindstone. By this, the small particle component having the baked coating layer, caused to expose the partial cross section of its baked layer and the small particle component.

The resulting artificial stone exhibited noctilucent light storing/light emitting .characteristics in all thickness directions, possesses milky white color and luster of marble tone with depth even ordinary, no bubbles were present inside and surface, the composition was uniform.

In test according to the Japanese Industrial Standard JIS K-7112, specific gravity was 2.29. And, water absorption was 0.13%. Other characteristic properties were as in Table 1 below.

Table 1 Item Results Test condition Flexural strength 31.30 kgf/cm according to JIS A5209 Compressive Crosshead speed 1400 kgf/cm 2 strength mm/min load cell 2 ton Pendulum-type impact Impact strength 4.58 kgf-cm/cm 2 Pendulum-type impact test Vickers hardness Hardness 1021 kgf/mm 2 according to JIS Z-2244 Coefficient of 0.65 (x 10-5K) TMA (30-100 0

C)

linear expansion JIS A5209 sand dropping Wear resistance 0.03 g type wear resistance test And, anomaly was not recognized also by acid resistance, alkali resistance test by 3% hydrochloric acid aqueous solution 8 hours immersion and 3% sodium hydroxide aqueous solution 8 hours immersion.

Using the obtained product as wall board of buildings, it was possible to obtain walls of beautiful granite tone having depth.

Example 2 Previously, using 40 wt% of the total small particle component transparent glass of particle diameter 5~50 mesh provided in a thickness of about 40 pm with the surface baking layer at about 700 0 C using strontium aluminate-based light storing material, small particle component and natural silicastone powder of average particle diameter 250 mesh in its weight ratio 2:1, so that it becomes 87 wt% of the composition total weight, uniformly mixed into mortar state together with methyl methacrylate (MMA) of 13 wt% (the one containing 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 NU.373 Q016 16 peroxide-based hardening agent of 2.0 wt% of weight), performed pressure heating molding, made into a plate-like body of thickness 12 mm.

Then, polished the surface part using diamond grindstone and silicon carbide magnesia-based grindstone, further removed only the resin part of the surface part at a water jet pressure of 1100 kg/cm 2 (nozzle diameter 0.75 mm, jet distance 40 mm).

The obtained artificial stone has, normally, depth and non-slip function, at night it was visible for a long time in all thickness directions by the light storing properties.

It was possible to use artificial stone effective as noctilucent guide post building material at the time of emergency electric failure.

It is desirable if at least preferred embodiments of the invention, provide high density artificial stone superior in light characteristics of noctilucent *properties etc. and having depth and luster, and good 20 characteristic properties is provided. Moreover, the 0 S09. production of such superior product is desired to be *06 :produced at far low cost compared with conventional products.

Throughout this specification and the claims, the 040: 25 words "comprise", "comprises" and "comprising" are used in *~ooea non-exclusive sense, except where the context requires otherwise.

It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or in any other country.

Modifications and improvements may be incorporated without departing from the scope of the present invention.

I4:\SbflyM\Xeep\Sp;Qci\P45Ce3 .doc tOIO/o COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11

Claims (10)

1. A noctilucent or fluorescent artificial stone, the artificial stone comprising an inorganic aggregate and a resin, wherein the inorganic aggregate contains a transparent inorganic aggregate with a coating layer of a noctilucent or fluorescent substance baked or coated onto the surface of the transparent inorganic aggregate, and the artificial stone contains 5 65 wt% of the transparent inorganic aggregate.

2. An artificial stone as claimed in claim 1 wherein the transparent inorganic aggregate is glass or silicastone.

3. An artificial stone as claimed in claim 1 or claim 2 wherein 20 to 80 wt% of the inorganic aggregate :j0 15 is the transparent inorganic aggregate with the coating layer of noctilucent or fluorescent substance baked onto or coating its surface.

4. An artificial stone as claimed in any one of the preceding claims wherein the resin is methacrylic resin.

5. An artificial stone as claimed in any one of the preceding claims wherein the inorganic aggregate comprises a small particle component of 5 to 70 mesh and a fine particle component of less than 100 mesh, and at least part of the small particle component is the transparent inorganic aggregate with the coating layer of a noctilucent or fluorescent substance baked onto or coating its surface.

6. An artificial stone as claimed in claim wherein 10 to 100 wt% of the small particle component is the transparent inorganic aggregate with the coating layer of a noctilucent or fluorescent substance baked onto or coating its surface.

7. An artificial stone as claimed in claim or claim 6 wherein the weight ratio of the small particle component to the fine particle component is 1:1 4:1.

8. An artificial stone as claimed in any one a: \SZerylM\Keep\ SpCcIAP&S653 10103/05 COMS ID No: SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11 11/03/2005 10:09 GRIFFITH HACK 4 00262837999 N0.373 0018 18 of the preceding claims wherein the thickness of the coating layer of the noctilucent or fluorescent substance is 5 to 50 pm.

9. An artificial stone as claimed in any one of the preceding claims wherein the amount of the resin is less than 15 wt%. An artificial stone as claimed in claim 9 wherein the amount of the resin is less than 10 wt%.

11. A noctilucent or fluorescent artificial stone substantially as hereinbefore described with reference to and as shown in the accompanying drawing. *0* 0 o* o o* o oooo Dated this 1 0 t h day of March 2005 DOPPEL CO., LTD By its Patent Attorneys GRIFFITH HACK H \Sheryl.\Keep\\Speci\Pes dcC :0/03/05 COMS ID No.SBMI-01160169 Received by IP Australia: Time 11:12 Date 2005-03-11