SURFACES OF TRANSPARENT RESIN IN WHICH MARBLE OR OTHER STONES ARE EMBEDDED

Abstract: A process for the production of a manufactured article for coatings, for components of sanitary ware, kitchen fitings, etc., in p olymerized transparent resin in which marble and other stones are embedded. The surface of the product is worked by brushing with abrasives, so as to obtain depressions corresponding to the resin, and slight projections with substantially uniform distribution corresponding to the inserts; advantageously, the inserts are "decapitated" to give smoothed surfaces.

Description: SURFACES OF TRANSPARENT RESIN IN WHICH MARBLE OR OTHER STONES ARE EMBEDDED DESCRIPTION 5 The invention relates to a product with special characteristics, which can be used as a product for coatings, for components of sanitary ware and in kitchen fittings and domestic worktops. This product consists of a polymerized transparent resin - which may be colored - in which inserts consisting of gravel of marble and/or of other stones, which may also be 0 obtained from waste recovered from other processes, preferably rounded, are embedded substantially uniformly. To obtain particular effects, to ensure surface protection of the resin, and for other purposes or advantages, according to the invention it is envisaged that the useful surface of the product should be worked by brushing with abrasives, so as to obtain slight depressions corresponding to the resin, whereas slight projections, distributed substantially uniformly and surrounded by the said depressions, are delineated corresponding to the said inserts. Advantageously, in one possible embodiment, prior to brushing with abrasives the product is "decapitated" (i.e. machined for uniform removal of a limited thickness) whereby the inserts appear at the surface with smoothed surfaces; the slight projections formed by the inserts remain smoothed, co-planar (flush) and surrounded by the said slight depressions obtained by brushing. Brushing can be followed by a surface polishing treatment of the resin and of the inserts. The invention also relates to a product for coatings, for components of sanitary ware and kitchen fittings and for domestic worktops, consisting of a polymerized transparent resin - which may also be more or less colored - in which inserts consisting of gravel of marble and/or other stones, even obtained from waste recovered from other processes, are embedded substantially uniformly. This product according to the invention is characterized in that there are slight projections corresponding to the inserts, and slight depressions corresponding to the resin, on the useful surface of the said product. Advantageously, the inserts may be smoothed at the surface (as a result of the "decapitation" machining), so that the projections become smoothed and coplanar (flush) and surrounded by the said slight depressions. The invention will be better understood by following the description and the appended drawing, which shows a practical, non-limitative example of the said invention. In the drawing: Fig. 1 shows a starting product that is to be processed according to the invention; Fig. 2 shows the product from Fig. 1 , processed by simple abrasion and brushing; Figs. 3 and 4 show the product that is first treated by removing a uniform thickness (decapitation) and is then treated by abrasion and brushing according to the invention; Fig. 5 shows a view along line V-V in Fig. 4; Fig. 6 shows a greatly magnified detail of the product as in Fig. 4. As illustrated in the accompanying drawing, using a technique that is already known (as described in another previous Italian patent application filed on 19.03.1995 No. FI/96/A54 by the same applicant), a conglomerate is formed from a transparent, and possibly colored, synthetic resin 1 , and a number of inserts 3 that are embedded in the resin and are in the form of gravel or other stone material, either natural, or possibly obtained from waste from previous processing, for example by treatment of fragments from previous processing to obtain the rounded shapes that are assumed in nature by gravel that is moved naturally by the water of stretches of water; the resin is then polymerized. The polymerized resin is sufficiently transparent or completely transparent, so that the inserts 3 can be seen through the thickness of the said resin. The surface obtained with the product of the aforementioned type, as illustrated in Fig. 1 , has a surface S that is intended to be seen, which is normally geometrically flat. A flat surface as stated above offers an appearance that is very uniform and so has characteristics that are not always acceptable. Moreover, as the surface S consists almost entirely of the polymerized resin 1 , its resistance to mechanical wear and to stresses of the thermal type - for example caused by placing metallic cooking utensils thereon, which are at a relatively high temperature - does not offer the stability that should preferably be offered by surfaces that are to be used in the domestic situation, for example surfaces of kitchen worktops or surfaces in living rooms etc. According to the invention, it is proposed to treat the surface S by brushing more or less intensively with abrasives of successively increasing fineness, so as to obtain wear of the uncovered surface of the resin whereas the inserts offer greater resistance; therefore after treatment the surface S1 , as shown in Fig. 2, has become undulating through the effect of wear of the resin zones and the greater resistance that is offered by the structure (which remains practically unchanged) of the surface inserts embedded in the resin. In consequence, the surface S1 is defined by the projecting portions represented by the surfaces of the inserts coming to the surface and by zones where there are slight depressions and undulation, which are formed by the resin, which accordingly does not come into direct contact with any objects that are placed on the product that has been treated in this way. According to a further development of the invention, the starting product shown in Fig. 1 is first worked by removing a thickness X (so-called "decapitation") which gives rise to the formation of a flat surface S10 (Fig. 3); this surface S10 consists partly of the resin and partly of the stone material of the inserts that was worn away together with the resin, and which therefore forms surfaces I that are substantially flat, flush, and appearing on surface S10. In this case too, after the process of removal of a thickness X, i.e. after the so-called "decapitation" of the surface inserts - shown as 13 in Fig. 3 - brushing with abrasives is carried out as already indicated for the processing as in Fig. 2; therefore the final surface consists (Figs. 4 and 6) of the zones I of the "decapitated" inserts 13 and the surfaces S13 forming slight depressions that are connected to the leveled surfaces I and have a slightly rounded periphery. In this case as well, objects placed on the final surface of the treated product rest on the zones I represented by the material of the stone inserts 13, whereas the surfaces in the depressions S13 are protected from contact with the objects, which are supported purely by surfaces I. "Decapitation" tends to lower the percentage of surface created by the resin, so as to increase the resistance to heat, and to wear. The slightly undulating appearance of the surfaces obtained by the treatment defined above - and as illustrated in Fig. 2 or in Figs. 4 and 6 - is certainly more pleasant and also differs in other ways from the appearance of a smooth surface such as that consisting of resin completely as designated by S in Fig. 1 or consisting of the surface S10 and the surfaces I of the "decapitated" material 13, as shown in Fig. 3. Conversely, the structure as obtained with reference to Fig. 2 or as obtained with reference to Figs. 4 and 6 will have a more characteristic and varying appearance, than a surface that is completely and monotonously flat. As well as the aesthetic advantage described above, there is a functional effect in that the depressions such as those of surface S1 or those of surface S13 - formed by the polymerized resin - are protected from wear and from thermal effects that might otherwise be exerted on the resin by the placing, for example, of a cooking vessel or some other object that might be placed thereon for whatever purpose, for example on a kitchen worktop. The projecting surfaces (such as those I or such as those rounded off in Fig. 2), being formed by the stone inserts, are resistant to wear and to heat, and keep their polish for a long time. The polymerized resin must be transparent or substantially transparent after polymerization, so as to permit the inserts 3 or 13 to be visible, like gravel immersed in clear water. Since these resins may undergo a slight color change over time, the transparent resin can also advantageously be slightly colored at the start, so as to avoid an excessive color change such as can result from yellowing of resin that is purely transparent and colorless when polymerized, some time after manufacture of the product; this possible color change over time is added to the slight initial coloration of the transparent mass of polymerized resin, thus avoiding excessively pronounced differentiation due to the color change that occurs over time. The drawing shows just one example, given purely as a practical demonstration of the invention, and the said invention can vary in forms and arrangements though without leaving the scope of the concept indicated by the said invention.

Claims: CLAIMS 1. A process for the manufacture of a product for coatings, for components of sanitary ware, kitchen fittings etc., consisting of a polymerized transparent resin, in which inserts consisting of gravel of marble and/or other stones are embedded substantially uniformly, characterized in that the useful surface of the product is processed by brushing with abrasives, so as to obtain slight depressions corresponding to the resin, whereas, corresponding to the inserts, there are slight projections, distributed substantially uniformly and surrounded by the said depressions. 2. A process as in claim 1 , characterized in that prior to brushing with abrasives, the product is "decapitated" with removal of a limited thickness, so that the inserts appear with leveled surfaces, and the slight projections formed by the inserts are then flush with and surrounded by the said slight depressions. 3. A process as in claim 1 or 2, characterized in that brushing is followed by a surface polishing treatment of the resin and of the inserts. 4. A process as in at least claim 1 , characterized in that a resin is used that becomes slightly colored when polymerized. 5. A product for coatings, for components of sanitary ware, kitchen fittings etc., consisting of a transparent polymerized resin in which inserts consisting of gravel of marble and/or other stones are embedded substantially uniformly, characterized in that the useful surface of the product has slight projections corresponding to the inserts and slight depressions corresponding to the resin. 6. A product as in claim 5, characterized in that the inserts are leveled at the surface and therefore the projections are leveled, flush and surrounded by the said slight depressions. 7. A product as in claim 5 or 6, characterized in that the transparent polymerized resin is slightly colored.

Inventors: GAGGINI SILENA, GAGGINI, SILENA
Applicants: GAGGINI SILENA, GAGGINI, SILENA
Application year: 2000
Main classification: B44C5
IPC codes: B44C5, B44F9, C04B41