Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1999-03-10
2001-05-01
Gupta, Yogendra (Department: 1751)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S346000, C428S349000, C428S351000, C428S35500R
Reexamination Certificate
active
06224974
ABSTRACT:
DISCLOSURE
This invention relates to coatings and to recyclable paper labels for glass bottles or the like, and more particularly to paper labels and coating for such paper labels to impart water repellence to, while still permitting recycling of, the same.
BACKGROUND OF THE INVENTION
It has long been known to recycle glass bottles or the like carrying paper labels with a caustic bottle washing solution. For example, see U.S. patent application Ser. No. 08/290,626, referred to in U.S. Pat. No. 5,654,039. Also the following:
U.S. Patents
3,946,750
4,340,638
4,103,698
4,349,402
4,108,774
4,434,259
4,176,067
4,594,111
4,185,647
4,661,152
4,258,104
4,964,939
4,278,727
5,330,581
4,325,775
German Patent DE 3607720 C2
Japanese Patent 52-14634
6-17018
European Patent 0 078 918
Some, but not all, of the approaches used in the prior art taught providing a metalized label, such as made at least in part of aluminum or other metallic material that was attacked or dissolved by the caustic bottle washing solution (for example, 3% NaOH in water). When the aluminum or metal was attacked, the label was caused to essentially disintegrate.
The label is attached to the bottle or other object with an adhesive that dissolved in the caustic bottle washing solution. Due to the speeds at which commercial bottle recycling or washing occurs, it is necessary that the labels be removed from the glass or bottles in but a few, say about 3 or 4 minutes. Any longer delay would slow down existing processes and/or require an expensive equipment process redesign. When this type label and adhesive were attacked by the caustic solution, in effect the whole or integral label was freed from the bottle. The labels and bottles are then separated, the labels generally being collected integral or whole, and then had to be separated out of the washing solution.
The former method was not usable with labels made of materials not attacked by caustic solution, and the latter approach required the separate step of collecting the freed labels from the washing solution.
Additionally, many times it is desired to have a label without a metalized appearance.
Further in addition to recyclability, it is desired that the labeled bottled or the like, have a certain degree of water repellence or water resistance. This property is desired as many times in taking a labeled bottle or the like from the bottler or manufacturer to its point of sale and/or use, it may be exposed to water, rain, frost, snow, fog, high humidity or a high moisture environment, or the like, and the label must retain an attractive appearance throughout its manufacture-use cycle despite such conditions.
SUMMARY OF THE INVENTION
The present invention provided a paper label and method for making the same of paper that need not be metalized or contain any metallic powder in order to be recyclable in the usually caustic bottle washing solutions, retains a good appearance when exposed to the various forms of moisture mentioned above throughout its life cycle, yet permits the label of the present invention to be readily removed and the removed label paper repulped and, if desired, reused to manufacture some type of paper product, such as tissue, writing and printing papers, label paper, etc. The label of the present invention comprises a pulpable label paper base (preferably free sheet—without mechanical pulp) to which is applied, as by a coating process, at least one water resistant but yet caustic dissolvable coating. Preferably, this coating is the first down and applied to the top side of the label paper base or web. The coating applied to the label base paper may also include a water repelling agent (preferably alkyl ketene dimer “AKD”), in weight of 2% to 4% of the total weight of the coating pigment. Preferably, such a coating comprises: a caustic soluble resin or polymer, for example an acrylic polymer (for example, Rhoplex I-2350), in weight of 8% to 25% of the total weight of the coating pigment (or 40% to 100% of binder). Though not necessary, a caustic soluble pigment, for example aluminum trihydrate, (sold under brand name Hydra-coat-5 made by Alcoa) in weight of 15% to 35% of the total weight of the coating pigment could be used.
No metal powder need to be used, nor need there be a deposited metal layer so that it is possible to produce a label without a metallic appearance. Of course, if a metallic appearance is desired, the present invention could also be utilized with metallics.
The present invention has the advantages of dispensing with the need for any metallic deposition process, should that be desired, provides a way to avoid a metallic surface or appearance, if desired, and does not use neat resin coatings.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a method for making a paper label which can be applied to and then later removed from a glass object in a caustic washing solution.
Another object of the present invention is to provide a coating for use on a paper label which can be applied to and then later removed from a glass object in a caustic washing solution.
Yet another object of the present invention is to provide a paper label which can be applied to and then later removed from a glass object in a caustic washing solution.
Still another object of the present invention is to provide a paper labeled glass object which can be de-labeled and the paper repulped in the caustic washing solution process.
A further objection of the present invention is to provide a method, coating, paper label and labeled object with good water repellency, but yet permit removal of the paper label from the object in a caustic washing solution.
These and yet other objects will become apparent from the foregoing and the following written description, accompanying drawings and claims.
REFERENCES:
patent: 3946750 (1976-03-01), Fischer et al.
patent: 4103698 (1978-08-01), Richardson et al.
patent: 4108774 (1978-08-01), Babunovic et al.
patent: 4176067 (1979-11-01), Vamvakas
patent: 4185647 (1980-01-01), Babunovic
patent: 4258104 (1981-03-01), Lee et al.
patent: 4278727 (1981-07-01), Brabetz et al.
patent: 4325775 (1982-04-01), Moeller
patent: 4340638 (1982-07-01), Brugmans
patent: 4349402 (1982-09-01), Parker
patent: 4434259 (1984-02-01), Gold et al.
patent: 4594111 (1986-06-01), Coonan
patent: 4661152 (1987-04-01), Kimura et al.
patent: 4964939 (1990-10-01), Gleason
patent: 5330581 (1994-07-01), Syrinek
patent: 5654039 (1997-08-01), Wenzel et al.
patent: 3607720 C2 (1990-01-01), None
patent: 0 078 918 (1983-05-01), None
patent: 52-14634 (1977-02-01), None
patent: 6-17018 (1994-01-01), None
Boyer Charles
Consolidated Papers Inc.
Gupta Yogendra
LandOfFree
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