Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
1999-01-19
2001-02-20
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S071000, C522S074000, C522S075000, C522S076000, C522S078000, C522S079000, C522S080000, C106S031600
Reexamination Certificate
active
06191185
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to inks, and more particularly to UV curable inks.
UV curable inks are quick-curing inks and therefore are advantageous for use in continuous-type processes in which subsequent treatment of an ink-printed substrate is involved. A number of UV curable inks are known. For example, U.S. Pat. No. 4,271,258 discloses a photopolymerizable ink composition containing acrylate resin, methacrylate monomer or oligomer, acrylate monomer or oligomer, photoinitiator, and a particular type of an epoxy resin. U.S. Pat. No. 5,391,685 discloses a UV curable ink having an isocyanate compound added thereto. U.S. Pat. No. 5,391,685 contends that the ink disclosed therein is particularly well suited for printing on slightly adhesive plastic bases, such as those made of polyoxymethylenes and polypropylenes.
Screen printing on spherical surfaces such as golf balls can be difficult. As a result, pad printing customarily is used for marking golf ball surfaces. However, many of the known UV curable inks are not well suited for pad printing due to difficulties in transferring the ink from a pad to a substrate. Furthermore, UV curable inks that can be pad printed have not been found suitable for use on golf balls. More specifically, when applied to a golf ball, these inks are not sufficiently durable (impact resistant) to withstand multiple blows by a golf club. It would be useful to obtain a highly durable UV curable ink which has favorable pad transfer properties when used for printing indicia on surfaces such as a curved and dimpled surface of a golf ball, and which provides an image having good durability.
SUMMARY OF THE INVENTION
An object of the invention is to provide a new and improved UV curable ink.
Another object of the invention is to provide a UV curable ink which is particularly well suited for application by pad transfer.
A further object of the invention is to provide a quick curing ink for use on a game ball, such as a golf ball, and on hard surfaces of other sporting goods, thereby enabling more rapid production.
Another object of the invention is to provide a pad printable, UV curable ink having good impact resistance.
Yet another object of the invention is to provide a game ball, such as a golf ball, having a clear and durable ink image printed thereon.
A further object of the invention is to provide a method for pad printing an indicia on a hard surface of a game ball, golf club, bat or racket, the indicia comprising a UV curable ink.
Yet another object of the invention is to provide a method for applying a smudge resistant and durable indicia to a visible surface of a game ball.
Other objects of the invention will be in part obvious and in part pointed out more in detail hereafter.
The invention is a UV curable ink composition. The ink composition comprises a UV curable resin, aluminum trihydroxide in an amount appropriate to provide the ink composition with improved pad transfer, a coloring agent, such as a pigment or dye, and a photoinitiator for initiating polymerization of the UV curable resin. The ink composition forms a cured indicia having adhesive properties and impact resistance which render the cured indicia suitable for use on game balls to be used in competitive play. A thinning agent which includes a monomer and/or solvent also is preferably included. A wetting agent and/or extender pigment also can be added. To facilitate pad transfer, the ink has a viscosity of 1,000-28,000 centipoise, preferably 1,000-4,000 centipoise, and more preferably 1,000-2,000 centipoise at the time of application.
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Richard J. Lewis, Sr. Hawley's Condensed Chemical Dictionary. 13th ed., 1997.
N.R. Dando et al. Journal of Coating Technology, vol. 68, No. 859, Aug. 1996, pp 67-72.
McClendon Sanza L.
Seidleck James J.
Spalding Sports Worldwide Inc.
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