Road structure – process – or apparatus – Apparatus – With surface marking
Patent
1998-05-29
2000-09-12
Lillis, Eileen D.
Road structure, process, or apparatus
Apparatus
With surface marking
404 93, E01C 2316
Patent
active
061168149
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the application of markings or signs on a surface, in particular road surfaces and the like. Other and similar surfaces which may be of interest in this connection, are for example industry floors which in certain cases are subjected to corresponding stresses and wear as roads.
For road markings for example in the form of edge lines, a good durability and long lifetime is desired, so that the expenses related to marking can be kept as low as possible. In addition to the direct wear resulting from car traffic, in particular with studded tires, it is also a great problem to obtain sufficient adhesion between the marking applied and the actual road suface. This is a problem that is rather accentuated when concrete pavements of high strength are concerned, but also other forms of road pavement, such as meagre or stone-rich asphalt pavements, i.e. asphalt pavements having a small content of bitumen. The difficulties of a good and durable adhesion is related to, inter alia, that water and moisture can penetrate into the road surface and from the underside weaken the adhesion of applied markings.
There are previously known a number of different methods and materials for use in such road marking and the like. U.S. Pat. No. 4,102,718 relates to a road marking material in tape form, which incorporates a primer layer of a thermoplastic material, which beforehand is bonded to the actual marking tape before being laid down on the road surface. As an initial step the road surface may be prepared with a wetting agent.
Norwegian patent 122.385 is more interesting since to a large extent it addresses the adhesion of a road marking mass being laid down on the road surface. There is however the question of sulphurous masses, which are not of any interest in the present connection. At the end of the patent specification it is mentioned briefly that priming can be applied, but without any closer discussion of the type of priming material.
As further examples of prior art of more remote interest, reference can be made to Norwegian patent 122.602 and Norwegian published patent application 126.029, Swedish published patent application 341.874, European patent application 0397.406 and U.S. Pat. No. 4,708,518. The latter patent specification is related to the above mentioned U.S. patent. It is to be noted that the Swedish patent publication referred to, in addition to a thermoset plastic as road marking material, also describes thermoplastic materials. The present invention takes as a starting point a method comprising the laying down of a layer of a heated mass of a thermoplastic material. The composition of such a known and typical thermoplastic material for this purpose, is as follows:
This typical road marking mass based on thermoplastic materials result in wear resistant and durable lines and the material hardens in seconds upon being laid down, so that for example car traffic can quickly run as normal afterwards without any risk of damages to cars or marking lines. Moreover it is important to remark that such a mass on a thermoplastic bases does not contain solvents or other substances that may be detrimental to health or environment. The mass can be laid out in a thickness from 1-6 mm.
According to the invention it has surprisingly been found that substantially improved results are obtained by applying a primer layer to the surface before laying down a heated mass of thermoplastic material, whereby the primer layer consists of a curable plastic material comprising two or more components.
As a curable plastic material to be employed here, there are several possible types, for example polyurethane. This because, inter alia, polyurethane is heat curable, so that the hardening of such a primer layer to a substantial degree will be provided for by the immediately following and superposed layer of heated thermoplastic material. Thus the heat being given off from the heated road marking mass makes it unnecessary to provide for any specific drying or curing time for the primer layer, so that the pre-treatme
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Addie Raymond W.
Lillis Eileen D.
Rieber & Son, Division Nor-Skilt
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