Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-10-20
1999-05-25
Krass, Frederick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523219, 523523, 523526, 523527, 427137, C09D 406, C09D 500, C08F28301, B01F 904
Patent
active
059070030
DESCRIPTION:
BRIEF SUMMARY
The invention relates to paint compositions intended to be applied to a road, motorway or similar surface to produce road markings.
In view of the large amount of road traffic, road markings using marking of roads, motorways and the like are nowadays an indispensable instrument of road safety.
To be effective, however, road markings using marking of roads, motorways and the like must satisfy a number of criteria, the main ones of which are stated below: daytime as at night; thickness and to its mechanical properties (resistance to wear and to impacts, adherence to the road surface and resistance to soiling); constitute a danger to the user.
Furthermore, the ease of processing of the road paint composition, the speed with which it can be applied and, above all, the delay in reopening the road to traffic after marking are also essential criteria for selection of the road paint composition.
At present the applications of road paint compositions are performed on dry surfaces, at ambient temperatures of between 5 and 40.degree. C. This, of course, limits the period of application to between the months of March and October and the days of application to rain-free days.
Among the road paint compositions employed at present there are known those containing an unsaturated polyester resin as binder; these compositions are usually two-component and can be applied at ambient temperatures to a road surface without the use of heating of the paint itself and/or of the road surface.
The chief defect of these road paint compositions based on unsaturated polyester resin lies in the fact that they cannot be applied in rainy weather. In fact, when the roadway is wet, these road paint compositions cure slowly or not at all and, in addition, do not adhere properly to the roadway.
To overcome these problems it has been proposed in the past, for example in U.S. Pat. No. 3,743,686, to modify the unsaturated polyester resin by inserting a particular monomer into it.
More recently, in the international application published under Number WO94/21960 a single-component road paint composition has been proposed including an unsaturated polyester, a crosslinking agent, at least one pigment, a suspension agent, a wetting agent, fillers, one or more polymerization inhibitors, glass beads, a catalyst in the form of an aqueous dispersion of a dibenzoyl peroxide encapsulated in an ionic environment produced with specific chemical compounds, the catalyst thus treated being bound to the surface of the glass beads, one or more accelerators such as organic cobalt salts or dimethylaniline and, preferably, an agent stabilizing against ultraviolet (UV) rays.
However, as the Applicant Company has been able to ascertain through many experiments, the curing of the road paint compositions which contain an unsaturated polyester is highly perturbed (i.e. absence of polymerization or delay in polymerization by at least half an hour) in the presence of moisture when the catalysts/accelerators employed are chosen from the pairs:
This is why the present invention is intended to provide new road paint compositions, the said compositions satisfying the abovementioned various criteria, in particular a satisfactory cure time, even when they are applied to a wet roadway as a thin layer (i.e. of the order of 1000 microns or less, and more generally of the order of 250 microns).
By a satisfactory cure time the Applicant Company means a time shorter than or equal to 15 minutes between the application of the road paint compositions and the reopening of the road to traffic after marking.
Taken in its first aspect, the present invention therefore has as its subject-matter road paint compositions characterized in that they contain as essential constituents, after application: comonomer for radical polymerization of the unsaturated polyester; derivatives, preferably from para-toluidine derivatives, more preferably from diethanol-para-toluidine, diethoxy-para-toluidine, diethyl-para-toluidine or a mixture of the abovementioned para-toluidine derivatives; paint and of preven
REFERENCES:
patent: 4666978 (1987-05-01), Storey et al.
Derwent Abstracts 94-068399, "Road Mark with Good Abrasion Resistance", Jun. 1992.
Derwent Abstracts 81-92157, "Resin Composition for Binding Mortar or Concrete", Nov. 1981.
Blot Estelle
Stock Claude
Krass Frederick
Lafarge Materiaux de Specialites
LandOfFree
Road paint compositions containing an unsaturated polyester resi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Road paint compositions containing an unsaturated polyester resi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Road paint compositions containing an unsaturated polyester resi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-401485