Aqueous traffic paint and method of application

• US 7,235,595 B2
• Filed: 08/03/2004
• Issued: 06/26/2007
• Est. Priority Date: 08/04/2003
• Status: Active Grant

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Matthews, Mary Anne R., Hermes, Ann R., Schall, Donald C., Sobczak, Jeffrey J.
• Primary Examiner(s): Cain; Edward J.
• Application Number:
  US10/910,212
• Publication Number:
  US 20050032933A1
• Time in Patent Office: 1,057 Days
• Field of Search: 523/172, 524/494
• US Class Current: 523/172
• CPC Class Codes: C08F 2/22 Emulsion polymerisation
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 291/00 Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C09D 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09D151/04, C09D151/06 take precedence
• CPC Class Codes: C09D 5/004 Reflecting paints; Signal paints

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.

Claims

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.

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.

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.

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.

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.