Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1991-05-06
1993-03-16
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526246, 526271, 526328, 526320, 525193, C08F22022, C08F22206, C08F22018, C08F 800
Patent
active
051945410
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to new acrylic copolymers which can be used for coating bituminous materials.
Bituminous materials are well known as sealing products in the building and civil engineering industry, in which they are employed especially for sealing mineral surfaces and metal components subjected to moisture, such as terraces, pipelines and offshore structures. They are also well known in the public works industry in the form of asphalt mixes which are spread on roads, roadways, runways and the like. A well-known disadvantage of bituminous materials in these various applications consists of the difficulty in coating them with a paint or with a coating capable of preventing them from degrading under the action of solar radiation and of modifying their aesthetic appearance, and in particular one capable of replacing their black color with a lighter color of the user's choice. In many fields of architecture and in particular in the decoration of buildings this disadvantage has resulted in bituminous materials being replaced with other sealing products which are more costly but whose aesthetic appearance can be modified without difficulty. In the field of public works a well-known application of the painting of bituminous materials consists of the marking coatings for protected pedestrian passages placed across roadways. In this application the difficulties of adhesion of the paint to the bituminous material, especially with the combined action of inclement weather and of vehicular traffic, result in the very frequent necessity of reapplication of these marking coatings.
SUMMARY OF THE INVENTION
The objective set by the present invention consequently consists in offering a new coating of bituminous material, itself capable of being coated with a finish coat capable of adhering durably to the said bituminous material (even under the prolonged action of inclement weather) and capable of substantially avoiding the yellowing of the finish coat due to the outward migration or exudation of the polyaromatic compounds and/or flux oils (chrysene) from the bituminous material.
In order to solve the problem which thus arises, a first subject of the present invention consists therefore of new acrylic copolymers comprising, per 100 parts by weight: acrylate or methacrylate of formula: ##STR2## in which: R.sub.1 is a methyl radical or a hydrogen atom, anhydride, acrylate or methacrylate, and acrylate or methacrylate.
Ethyl diglycol acrylate may be mentioned especially as a polyoxyether (meth)acrylate.
A fluoroalkyl (meth)acrylate within the meaning of the present invention means preferably a compound of formula: ##STR3## in which: R.sub.3 is a methyl radical or a hydrogen atom, CH.sub.3, CH.sub.2 --CH.sub.3 and CF.sub.3,
2,2,2-Trifluoroethyl methacrylate may be mentioned as an example of such a compound.
Alkoxyalkyl (meth)acrylate within the meaning of the present invention means preferably the compounds of formula: ##STR4## in which: R.sub.6 is a methyl radical or a hydrogen atom, and branched alkyl radicals containing from 1 to 6 carbon atoms.
As examples of such compounds there may be mentioned methoxymethyl, ethoxyethyl, ethoxymethyl, methoxyethyl, isopropoxymethyl and isopropoxyethyl acrylate and methacrylate.
It is important that the polyoxyether (meth)acrylates present in the copolymers according to the invention should not be confused with alkylene glycol (meth)acrylates which end in a hydroxyl functional group, since the latter do not offer the advantages expected as a function of the objective of the present invention.
The copolymers according to the invention can be in the form of an aqueous dispersion, it being possible for the solids content (concentration of solid matter) of the said dispersion to be up to approximately 70% by weight. The particle size of the aqueous dispersion (determined by turbidimetry) may be approximately between 0.05 and 0.5 .mu.m. The Brookfield viscosity at 20.degree. C. of an aqueous copolymer dispersion according to the invention may be gen
REFERENCES:
patent: 3920614 (1975-11-01), Kirimoto et al.
patent: 5032658 (1991-07-01), Baron et al.
Legros Robert
Tripette Claude
Wiegert Bernard
Cheng Wu C.
Schofer Joseph L.
Societe Anonyme Dite Norsolor
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