Aqueous traffic paint and method of application
AssigneeRohm and Haas Company
InventorsAnn Hermes, Mary R. Matthews, Donald Schall, Jeffrey Sobczak
Life of this patent
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Abstract
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.
Claims14
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.
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.
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.
Dependencies are inferred from the claim text.