Traffic marking paint

DETAILED DESCRIPTION The term "non-aqueous resin dispersion" as used herein means a dispersion in which a resin is dispersed in an organic solvent, unlike an aqueous latex or emulsion in which a resin is dispersed in water.
Non-aqueous dispersions of resins having a glass transition temperature of 20.
degree.
to 70.
degree.
C.
are usable in the invention.
The non-aqueous dispersions are prepared by known processes, e.
g.
a process in which a dispersant such as an alkyd resin and a dispersoid such as an acrylic monomer are dissolved or dispersed in a dispersion medium such as an aliphatic hydrocarbon solvent and the polymerization is conducted, and a process in which the dispersant is first formed by polymerization and the dispersoid is then added to the reaction mixture and polymerized.
In order to obtain non-aqueous resin dispersions suitable for attaining the objects of the invention, an aliphatic hydrocarbon such as hexane, heptane or cyclohexane and an aromatic hydrocarbon such as toluene or xylene are preferably employed in the invention as a dispersion medium.
These mediums may be employed alone or in admixture thereof.
Resins having a certain degree of reactivity are preferably employed as a dispersant, e.
g.
an acrylic resin such as polymethyl methacrylate, an alkyd resin, an acrylic modified alkyd resin, chlorinated rubber and polybutadiene.
The dispersoid used in the invention includes ethylenically unsaturated monomers, e.
g.
acrylic monomers such as methyl acrylate or methacrylate, ethyl acrylate or methacrylate, butyl acrylate or methacrylate and 2-hydroxyethyl acrylate, acrylonitrile and styrene.
The ethylenically unsaturated monomers may be employed alone or in admixture thereof.
A mixture of methyl methacrylate and ethyl and butyl acrylates is preferably employed in the present invention, and in particular, the mixture containing 20 to 70% by weight of methyl methacrylate is preferred.
Preferable non-aqueous dispersions are obtained by the polymerization of a monomer mixture containing methyl methacrylate in the aliphatic or aromatic hydrocarbon dispersion medium in the presence of the above-mentioned dispersant