Method of reducing yellowing of water-borne road marking paints and composition used therein

- Rohm and Haas Company

A water-borne road marking paint composition which includes a chelating agent capable of chelating iron ions to form a substantially colorless complex is provided. A road marking produced from the traffic paint of the present invention substantially reduces or prevents yellowing of white road marking from iron and iron compound debris strewn on the road surfaces. A method of reducing or preventing yellowing of a newly-applied road marking on a road surface of a water-borne road marking paint is also disclosed. The method comprises incorporating in the water-borne road marking paint a chelating agent capable of chelating iron ions to form a substantially colorless complex. Further reduction of yellowing of the road marking is observed when a pigment dispersant is incorporated in the water-borne road marking paint.

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Claims

1. A road marking of a water-borne road marking paint applied on a road surface, said paint comprising a chelating agent capable of chelating iron ions to form a substantially colorless complex.

2. A method of reducing or preventing yellowing of a newly-applied road marking on a road surface of a water-borne road marking paint, said method comprising incorporating in said water-borne road marking paint a chelating agent capable of chelating iron ions to form a substantially colorless complex.

3. The method of claim 2 further comprising incorporating in said water-borne road marking paint, a pigment dispersant for further reducing or preventing yellowing of said newly-applied road marking.

4. A road marking paint applied as a road marking on a road surface in accordance with the method of claim 2.

5. A road marking of claim 1 wherein the chelating agent capable of chelating iron ions comprises a compound bearing one or more PO(OH).sub.2 groups or EDTA.

6. A road marking of claim 1 wherein the chelating agent capable of chelating iron ions is amino-tris-methylene phosphonic acid.

7. A road marking of claim 1 wherein said paint comprises 0.1 to 5 percent by weight based on the total weight of polymer solids of said chelating agent.

8. A road marking of claim 1 wherein said paint further comprises a pigment dispersant.

9. A road marking of claim 1 wherein said paint further comprises a white pigment.

10. The method of claim 2 wherein the chelating agent capable of chelating iron ions comprises a compound bearing one or more PO(OH).sub.2 groups or EDTA.

11. The method of claim 2 wherein the chelating agent capable of chelating iron ions is amino-tris-methylene phosphonic acid.

12. The method of claim 2 wherein said paint comprises 0.1 to 5 percent by weight based on the total weight of polymer solids of said chelating agent.

13. The method of claim 2 further comprising incorporating in said water-borne road marking paint, a white pigment.

Referenced Cited
U.S. Patent Documents
4325856 April 20, 1982 Ishikawa et al.
4654397 March 31, 1987 Mueller-Mall et al.
4814209 March 21, 1989 Arnold
4814373 March 21, 1989 Frankel et al.
4916171 April 10, 1990 Brown et al.
5527853 June 18, 1996 Landy et al.
Foreign Patent Documents
343831 May 1989 EPX
Patent History
Patent number: 5714527
Type: Grant
Filed: Jun 4, 1996
Date of Patent: Feb 3, 1998
Assignee: Rohm and Haas Company (Philadelphia, PA)
Inventors: Josef Hans Jilek (Vienna), Angelo Sanfilippo (Valbonne), Donald Craig Schall (Lansdale, PA), Andrew Paul Trapani (Valbonne)
Primary Examiner: Edward J. Cain
Attorney: Sudhir Deshmukh
Application Number: 8/651,836