Aqueous traffic paint and method of application
An aqueous traffic paint including hard-soft polymer particles, polyfunctional amine, and volatile base is provided. The hard-soft polymer particles, which contain soft polymer and hard polymer, have a hydrophobicity characterized by a Hansch parameter of at least 3. Also provided is a method of producing a traffic marking on a road surface using the aqueous paint. The aqueous traffic paint is suitable for application to road surfaces, including oily road surfaces, and may be applied at temperatures below 15° C.
1. An aqueous traffic paint comprising:
a) hard-soft polymer particles comprising pendant acid-functional groups;
wherein each of said hard-soft polymer particles comprise, based on weight of said hard-soft polymer particles:
i) from 65 to 95 weight % of a soft polymer having a glass transition temperature in the range of from −40 to 20° C., and
ii) from 5 to 35 weight % of a hard polymer having a glass transition temperature of at least 40° C.;
wherein said hard-soft polymer particles have a Hansch parameter of at least 3;
b) polyfunctional amine; and
c) an amount of volatile base sufficient to raise the pH of said aqueous traffic paint to a point where substantially all of the polyfunctional amine is in a non-ionic state.
2. An aqueous traffic paint comprising:
a) hard-soft polymer particles comprising pendant acid-functional groups;
wherein each of said hard-soft polymer particles comprise, based on weight of said hard-soft polymer particles:
i) from 50 to 65 weight % of a soft polymer having a glass transition temperature in the range of from −75 to −30° C., and
ii) from 35 to 50 weight % of a hard polymer having a glass transition temperature of at least 30° C.;
wherein said hard-soft polymer particles have a Hansch parameter of at least 3;
b) polyfunctional amine; and
c) an amount of volatile base sufficient to raise the pH of said aqueous traffic paint to a point where substantially all of the polyfunctional amine is in a non-ionic state.
3. The aqueous traffic paint according to claim 1 further comprising a silane functional compound.
4. The aqueous traffic paint according to claim 1 further comprising a photosensitive composition.
5. The aqueous traffic paint according to claim 1 further comprising a photosensitive composition and a silane functional compound.
6. The aqueous traffic paint according to claim 1 wherein said polyfunctional amine comprises as a polymerized unit a monomer selected from the group consisting of vinylamine, oxazolidinylethyl acrylate, oxazolidinylethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, and ethyleneimine.
7. A method of producing a traffic marking on a road surface comprising the steps of:
a) applying onto said road surface a layer of an aqueous traffic paint comprising:
i) hard-soft polymer particles comprising pendant acid-functional groups;
wherein each of said hard-soft polymer particles comprise, based on weight of said hard-soft polymer particles:
from 65 to 95 weight % of a soft polymer having a glass transition temperature in the range of from −40 to 20° C., and
from 5 to 35 weight % of a hard polymer having a glass transition temperature of at least 40° C.;
wherein said hard-soft polymer particles have a Hansch parameter of at least 3;
ii) polyfunctional amine; and
iii) an amount of volatile base sufficient to raise the pH of said aqueous traffic paint to a point where substantially all of the polyfunctional amine is in a non-ionic state; and
b) evaporating said volatile base from said aqueous traffic paint to provide said traffic marking.
8. The method according to claim 7 further comprising the step of dropping glass beads onto said layer of said aqueous traffic paint.
9. The method according to claim 7 further comprising the step of contacting said layer of said aqueous traffic paint with an absorber.
10. A traffic marking prepared in accordance to the method of claim 7 .
11. The aqueous traffic paint according to claim 2 further comprising a silane functional compound.
12. The aqueous traffic paint according to claim 2 further comprising a photosensitive composition.
13. The aqueous traffic paint according to claim 2 further comprising a photosensitive composition and a silane functional compound.
14. The aqueous traffic paint according to claim 2 wherein said polyfunctional amine comprises as a polymerized unit a monomer selected from the group consisting of vinylamine, oxazolidinylethyl acrylate, oxazolidinylethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, and ethyleneimine.