Resin based fluorescent marking stain

Details Resin based fluorescent marking stain Resin based fluorescent marking stain

2002-03-25

2004-12-07

Shosho, Callie (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C106S031150, C106S031320, C106S031570, C401S196000, C524S296000

Reexamination Certificate

active

06828359

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention is directed to a fluorescent marking stain. More particularly, the present invention is directed to a readily applyable, resin based fluorescent marking stain for use in coating or marking parts.
Parts or assemblies are often marked with paints or dyes to facilitate identification and/or location. This is particularly true when the parts or assemblies are used in dark or confined spaces. However, known paints or dyes for this use are simply colored. Thus, while this marking facilitates identification, it does not enhance the ability to identify or locate the parts in low light situations.
To this end, it has been found useful to provide the ability to locate or identify parts using enhanced visual means.
Accordingly, there exists a need for a fluorescent marking stain that enhances the ability to visually identify and locate parts. Desirably, such a stain is resin based and reduces or eliminates any corrosion of the marked parts or assemblies. Such a stain can be provided in a readily usable form to permit marking of parts.
BRIEF SUMMARY OF THE INVENTION
A fluorescent marking stain is used for marking items. The stain enhances the ability to visually identify and locate parts. Preferably, such a stain is readily usable in a variety of different forms to permit marking of parts. A present marking stain is yellow.
The stain is a resin based fluorescent marking stain and includes a resin, preferably an acrylic resin, present in a concentration of about 10 percent to about 20 percent of the marking stain. An active solvent, preferably acetone and an aromatic hydrocarbon, such as xylene, for and compatible with the resin is present in a concentration of about 65 percent to about 85 percent of the marking stain.
The stain can include a dye solvent. A preferred dye solvent, if used, is diacetone alcohol, present in a concentration of about 0.1 percent to about 10.0 percent of the marking stain and a plasticizer, preferably diisononyl phthalate, present in a concentration of about 1.0 percent to about 5.0 percent of the marking stain.
The stain further includes an optical brightener present in a concentration of about 0.5 percent to about 5.0 percent of the marking stain. In a present formulation, the optical brightener is an amino coumarin. The fluorescent dye is present in a concentration of about 0.1 percent to about 5.0 percent of the marking stain. In a present stain, the fluorescent dye is a quinoline dye that is yellow in color.
While a variety of different application forms is anticipated, a marking pen for marking with the marking stain includes a porous nib and a chamber for storing the stain, in which the nip is in fluid communication with the stain in the chamber.
These and other features and advantages of the present invention will be apparent from the following detailed description, in conjunction with the appended claims.


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