Method of reducing yellowing of water-borne road marking paints

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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524127, 524128, F21S 722

Patent

active

057145270

ABSTRACT:
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.

REFERENCES:
patent: 4325856 (1982-04-01), Ishikawa et al.
patent: 4654397 (1987-03-01), Mueller-Mall et al.
patent: 4814209 (1989-03-01), Arnold
patent: 4814373 (1989-03-01), Frankel et al.
patent: 4916171 (1990-04-01), Brown et al.
patent: 5527853 (1996-06-01), Landy et al.

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