Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1999-08-05
2001-04-24
Zirker, Daniel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S041800, C428S195100, C428S327000, C428S354000, C428S422000, C428S447000, C428S906000
Reexamination Certificate
active
06221485
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to linerless labels, and more particularly to linerless labels incorporating a non-gloss, i.e., matte finished, silicone release composition.
2. Description of Related Art
Linerless labels are typically manufactured by applying a permanent, removable or repositionable pressure sensitive adhesive onto one side of a paper or synthetic continuous substrate or web and applying a release coating to the opposite side of the substrate. The resultant article is then wound upon itself to form a roll. The presence of a release coating on the side of the substrate opposite the adhesive allows the article to be rolled up and then subsequently unrolled, without the adhesive sticking to the substrate. Linerless labels obviate the need for a separate release sheet or liner that must be stripped from the adhesive layer and discarded prior to applying the adhesive substrate to the intended surface. Such liners are inconvenient, costly and often constitute an environmental problem.
The ability to print bar coded information onto labels is often desirable. Standard release coatings used in the linerless label field to produce self-wound direct thermal linerless labels give the imaging (i.e., release) side of the labels a glossy appearance. Under certain ambient lighting conditions, glare from these standard release coatings has a tendency to interfere with the ability of scanning equipment to decode the information stored in bar code images that is thermally printed on the label face.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a silicone release composition, a linerless label incorporating the silicone release composition, and a method for producing a linerless label that substantially obviate one or more of the problems due to limitations and disadvantages of the related art.
To achieve the advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention includes in one embodiment a silicone release composition having a non-gloss, i.e., matte-finished, surface. This release composition includes a crosslinked silicone-based polymer having microparticles of a polymeric wax at least partially embedded therein.
In another aspect, the invention includes a linerless label having a substrate, a silicone release layer disposed on the front side of the substrate, and an adhesive layer disposed on the back side of the substrate. The release layer includes the aforementioned crosslinked silicone-based polymer having microparticles of a polymeric wax at least partially embedded therein.
In a further aspect, the invention includes a method for producing linerless label stock. The method involves mixing an uncured silicone material with microparticles of a polymeric wax. This mixture is coated onto the front side of a substrate. The coated substrate is exposed to UV radiation to crosslink the silicone around the microparticles of polymeric wax. An adhesive material is coated onto the back side of the substrate. The coated substrate is wound into a roll of linerless label stock.
In a preferred embodiment of the invention, the substrate on which the adhesive material and the release composition is coated is a direct thermal paper, and the label is a linerless direct thermal label.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Additional advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
The accompanying drawing is included to provide a further understanding of the invention and is incorporated in and constitutes a part of this specification, illustrates one embodiment of the invention and together with the description serves to explain the principles of the invention.
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Khatib Khaled M.
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Sanchez Michael J.
Finnegan Henderson Farabow Garrett & Dunner
Moore Business Forms Inc.
Zirker Daniel
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