MXPA99007038A - Printable linerless labels - Google Patents

Abstract

A linerless label includes a paper substrate having a weight of about 60 lbs. per 3,000 square feet with a pressure sensitive adhesive (preferably a repositional adhesive) substantially covering one face and a release coating substantially covering the other face. The release coating has pen or felt tip marker receptivity and comprises at least about 90%by weight of about 100%concentration UV curable silicone, and at least 2%by weight photoinitiator, and a coat weight of at least about ten grams per square meter. For pen receptivity the release coating may comprise about 96.5%silicone and about 3.5%photoinitiator. For felt tip marker receptivity the release coating comprises about 95%silicone and about 5%photoinitiator. The linerless label typically comprises part of a web of labels in a roll configuration.

Description

LABELS WITHOUT PRINTED COATINGS Uncoated labels, particularly those with adhesive that can be removed or replenished, are typically sold in a roll configuration and are highly successful products. However, in the past they have had problems with delamination by delamination after manufacture in a roll product. Some uncoated labels thus have a high release rate by delamination that the labels can not be unrolled properly, while other labels could still be unrolled due to the significant conversion problems resulting from the high waste rates, low productivity and that they need to work again. Consequently, the present invention has been recognized as having problems associated with the manufacture of conventional roll-less labels that have not had a releasable coating as effective as necessary. In accordance with the present invention it has been found rable to improve the properties of the releasable coating, but at the same time it is necessary to ensure that the releasable coating can be written on it with at least one ballpoint pen with conventional ink or a felt tip marker, depending on the client's application.

According to the present invention the problem with the uncoated labels of the prior art was solved by using a chemical compound that was hitherto mainly used as a UV silicone additive to impart hardness to other easily releasable silicones. This additive, preferably sold in the version of Th. Goldschmidt AG under the trademark "TEGO RC 711" is used substantially because it has higher strength and an increased photoinitiator component (compared to the increase in conventional silicone releasable materials). When used with appropriate paper combinations and coating weight it is possible to provide - in accordance with the present invention - a label with less coating with the appropriate release level while still exhibiting the receptivity of the ballpoint pen and felt tip marker. In accordance with one aspect of the present invention there is provided an uncoated label comprising the following components. A paper substrate that has first and second faces. A pressure sensitive adhesive that substantially covers the second side. And, a releasable coating substantially covering the first face and having receptivity to the felt tip pen or ballpoint pen; the releasable coating comprises at least about 90% by weight, at about 100% concentration, of a silicone curable by UV radiation and at least 2% by weight of photoinitiator, and a coating weight of at least about 10. grams per square meter. When the receptivity to the pen is particularly important, the releasable coating comprises between about 96-97% (more preferably about 96.5%) of silicone curable by radiation, having less than 1% volatile content, at about 100% concentration, and between about 3-4% (more preferably about 3.5%) of conventional photoinitiator. A coating weight of between about 25-35 grams per square meter is also provided. The adhesive normally comprises pressure sensitive backing adhesive, although the removable adhesive or even in some circumstances the permanent adhesive may be provided. The paper substrate can comprise litho paper for all-purpose use either on one side or two si or bond OCR. The paper typically has a weight of between about 50-70 pounds per 3,000 square feet (more preferably about 60 pounds per 3,000 square feet). When the receptivity of the felt tip marker is particularly important, the releasable coating preferably comprises between about 94-96% (more preferably about 95%) silicone curable with radiation, having less than 1% volatile content, at about 100% concentration, and between about 4-6% (more preferably about 5%) of conventional photoinitiator. A coating weight of between about 10-20 grams per square meter is provided. The paper substrate may comprise all-purpose litho paper coated on one side with a releasable coating applied to the uncoated side, or bond OCR. The paper typically has a weight of between about 50-70 pounds per 3,000 square feet (more preferably about 60 pounds per 3,000 square feet). In accordance with another aspect of the present invention there is provided an uncoated label roll comprising the following components: An OCRT bond sheet or all-purpose litho paper having first and second faces. One adhesive that can be replaced sensitive to pressure substantially covers the second side. And a releasable coating substantially covers the first face with receptivity to the pen. The releasable coating comprises between about 96-97% silicone curable with UV radiation, having less than 1% volatile content, at about 100% concentration, and between about 3-4% photoinitiator, and a coating weight between approximately 25-35 grams per square meter. The releasable coating preferably comprises about 96.5% silicone curable with radiation and about 3.5% photoinitiator, and the paper preferably has a weight of approximately 60 pounds per 3,000 square feet. According to yet another aspect of the present invention there is provided an uncoated label roll comprising the following components: A sheet of OCR bond paper or litho for all use having first and second faces. An adhesive that can be placed again sensitive to the pressure substantially covering the second face. And, a releasable coating substantially covering the first face and having receptivity to the pen. The releasable coating comprises between about 94-96% silicone curable with UV radiation, having less than 1% volatile content, at about 100% concentration, and about 10-20 grams per square meter. The releasable coating preferably comprises about 95% radiation curable silicone and about 5% photoinitiator, and the sheet comprises approximately 60-pound litho all-purpose paper coated either on one side with a releasable coating applied to the uncoated side, or OCR bond. It is the main object of the present invention to provide uncoated labels, particularly in roll configuration, which does not have high delamination delamination or convert problems that may be encountered in the uncoated labels of the prior art. These and other objects of the invention will become clear from an inspection of the detailed description of the invention and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top perspective view of an illustrative sheet of uncoated labels according to the present invention. Figure 2 is a side view, greatly exaggerated in size for clarity of the illustration, of an uncoated label of Figure 1; and Figure 3 is a side view of an uncoated label sheet in accordance with the present invention. DETAILED DESCRIPTION OF THE DRAWINGS An illustrative uncoated label 10 according to the present invention is illustrated in Figure 1, showing a sheet 11 in association with other uncoated labels 10. Each of the labels 10 can be cut with matrix together with other uncoated labels 10. Each of the labels 10 can be cut from the sheet 11, by the weakening lines, such as lines with perforations 12, can be provided between the uncoated labels 10. Alternatively, the labels without coating 10 they can be connected end to end with each other with the lines of weakness between them and without surrounding the matrix, or other conventional configurations that can be supplied as is common in the trade. In Figure 2 an illustrative uncoated label 10 in accordance with the present invention is illustrated in a form that is greatly exaggerated in size and with relative dimensions for clarity of the illustration. As is conventional, the uncoated label 10 includes a paper substrate 14 having first and second faces 15, 16, respectively, with a releasable coating 17 that substantially covers the first face 1, and a pressure sensitive adhesive 18 that substantially covers the second side 16. The pressure sensitive adhesive 18 preferably consists of an adhesive that can be replenished, such as that sold by Moore Business Forms, Inc. of Lake Forest, Illinois under the trademark w CLEANTAC® ", however it is they can provide other pressure sensitive adhesives, including removable adhesives, or even permanent adhesives What has been described up to now is conventional per se in the uncoated label technique, which is unique according to the present invention. invention is the particular releasable coating 17 that is supplied, as well as the particular weight and type of the paper substrate 14, preferably used with the same, and the weight of the coating 17. The uncoated labels of the prior art with replenishing adhesive which is conventionally used in the easy-to-release silicone coatings, such as those curable by exposure to ultraviolet (UV) radiation, they have had great detachment by delamination, and / or convert the resulting problems into high waste regimes, low productivity and the like. This is sold in accordance with the present invention using as a releasable coating 17 a UV curable silicone that is normally used to impart stiffness to other easy to release silicones. Instead of being used merely as an additive, however, it is used correctly, which is approximately 100% concentrated. The releasable coating comprises at least about 90% by weight of this silicone curable with UV radiation and at least about 2% by weight of photoinitiator, and a coating weight of at least about 10 grams per square meter (v. 10-50 g / m3). Although different silicones curable with UV radiation can be used, the preferred silicone for coating 17 according to the present invention is sold by Th. Goldschmidt AG under the trademark TEGO RC 711. This product is a substantially solvent-free product (having a volatile content of less than 1%) which can be cured either by an electron beam or UV radiation, with a suitable photoinitiator which is necessary for the curable version of UV which is preferred according to the invention. It has a viscosity at 25 ° C of approximately 500 mPas, and a specific density of approximately 25 ° C of approximately 1.0 g / cc, and an instantaneous flash point of more than 100 ° C. Although a wide variety of suitable photoinitiators is available, one that is particularly desirable according to the present invention is the Darocure 1173 photoinitiator.

When the receptivity of the pen of the coating 17 is particularly important, the coating 17 preferably comprises between about 96-97% (more preferably about 96.5%) by weight of silicone curable with radiation at a concentration of about 100%, and between about 3- 4% (preferably about 3.5%) by weight of photoinitiator. A coating weight of the coating 17 of between about 25-35 grams per square meter is appropriate. For this pen receptivity modality the desirable paper substrate 14 comprises litho paper for all coated use either on one side or on both sides, or bond OCR. The weight of paper that is most desirable is between about 50-70 pounds per 3,000 square feet, more preferably about 60 pounds.

Where the receptivity to a felt tip marker is particularly important, the releasable coating 17 according to the invention preferably comprises about 94-96% (more preferably about 95_% silicone curable with radiation at a concentration of about 100% , and between about 4-6% of photoinitiator (preferably about 5%), with a coating weight of between about 10-20 grams per square meter In this embodiment the paper substrate 14 may comprise all-purpose litho paper coated by one side with the releasable coating 17 applied to the uncoated side (that is, the face 15 of the substrate 14 is uncoated), or the substrate 14 may comprise bond OCR, again the paper weight is preferably between about 50-70 pounds by 3,000 square feet (more preferably approximately 60) In all cases the preferred adhesive 18 is ad Repositionable adhesive such as the CLEANTAC® adhesive from Moore Business Forms, Inc. The uncoated label sheet 11 in accordance with the present invention is preferably in a roll configuration 20 as illustrated in Figure 3. Uncoated labels 10 according to the present invention can be taken from the roll 20 without the high delamination by delamination or converting the present problems in the prior art, even the surface of the releasable coating 17 has receptivity to ballpoint pen and / or marker with felt tip. Although the invention has been shown and described in what is currently conceived it will be the most practical and preferred embodiment thereof which will be apparent to those skilled in the art who can make many modifications thereof within the scope of the invention. For example, although the coatings 17, 18 are shown in Figure 2, they will be applied directly to the faces 15, 16, where one or more intermediate coatings (eg, linked coatings) may be provided, such as to provide greater adhesion. between the coatings and the substrate 14, such as those illustrated in the US Patent 5,354,588. Other modifications are also possible, in this way the invention is in accordance with the broader interpretation of the appended claims in order to encompass all equivalent structures and products.

Claims (20)

1. An uncoated label comprising: a paper substrate having first and second faces; a pressure sensitive adhesive substantially covering the second face; and a releasable coating that substantially covers the first face and has receptivity to a ballpoint pen or felt tip marker; the releasable coating comprises at least about 90% by weight, at about 100% concentration of a silicone curable with UV radiation and at least 2% by weight of photoinitiator, and a coating weight of at least about 10 grams per square meter.

2. An uncoated label as claimed in claim 1, wherein the releasable coating comprises between about 96-97% silicone curable with radiation, having at least 1% volatile content, to about 100% of concentration, and between approximately 3-4% of photoinitiator, and a coating weight of between approximately 25-35 grams per square meter, and receptive to a ballpoint pen.

3. An uncoated label as claimed in claim 2, wherein the paper substrate comprises litho paper for all coated use on either side or both sides, or bond OCR.

4. An uncoated label as claimed in claim 3, wherein the paper has a weight of approximately 50-70 pounds per 3,000 square feet.

5. An uncoated label according to claim 3, wherein the adhesive comprises pressure sensitive reclosable adhesive.

6. An uncoated label as claimed in claim 1, wherein the adhesive comprises reclosable pressure-sensitive adhesive.

7. An uncoated label as claimed in claim 4, wherein the adhesive comprises reclosable pressure-sensitive adhesive.

8. An uncoated label as claimed in claim 2, wherein the releasable coating comprises about 96.5% silicone curable with radiation and about 3.5% photoinitiator.

9. An uncoated label as claimed in claim 1, wherein said releasable coating comprises between about 94-96% silicone curable with radiation, having less than 1% volatile content, at about 100% concentration, and between about 4-6% photoinitiator, and a coating weight of between about 10-20 grams per square meter, and has receptivity to felt tip marker.

10. An uncoated label as claimed in claim 9, wherein said releasable coating comprises about 95% silicone curable with radiation, and about 5% photoinitiator.

11. An uncoated label as recited in claim 9, wherein the paper substrate comprises litho all-purpose paper coated on one side with the release coating applied to the uncoated side of the all-purpose litho paper, or bond OCR.

12. An uncoated label as claimed in claim 11, wherein the paper has a weight of approximately 50-70 pounds per 3,000 square feet.

13. An uncoated label as claimed in claim 11, wherein the adhesive comprises reclosable pressure-sensitive adhesive.

14. An uncoated label as recited in claim 9, wherein the adhesive comprises reclosable pressure-sensitive adhesive.

15. An uncoated label as mentioned in claim 9, placed on a label sheet, the label sheet having the configuration of a roll.

16. An uncoated label according to that mentioned in claim 2, placed on a label sheet, said sheet having a roll configuration.

17. An uncoated label roll comprises: a litho all-purpose sheet or bond OCR that has first and second sides; a reclosable pressure-sensitive adhesive substantially covering the second face; and a releasable coating substantially covering the first face and having receptivity to a ballpoint pen; the releasable coating comprises between about 96-97% by weight of silicone curable with UV radiation, having less than 1% volatile content, at about 100% concentration, and between about 3-4% by weight of photoinitiator, and a coating weight between approximately 25-35 grams per square meter.

18. An uncoated label sheet as claimed in claim 17, wherein the releasable coating comprises about 96.5% silicone curable with radiation and about 3.5% photoinitiator; and where the paper weighs approximately 60 pounds per 3,000 square feet.

19. An uncoated label sheet comprising: a sheet of all-purpose litho paper or OCR bond having first and second faces; a reclosable pressure-sensitive adhesive substantially covering the second face; and a releasable coating that substantially covers the first face and that has receptivity to a ballpoint pen; said releasable coating comprises between about 94-96% by weight of silicone curable with UV radiation, having less than 1% volatile content, at about 100% concentration, and between about 4-6% by weight of photoinitiator, and a coating weight of between approximately 10-20 grams per square meter.

20. An uncoated label sheet as claimed in claim 19, wherein the releasable coating comprises about 95% silicone curable with radiation, and about 5% photoinitiator; wherein the sheet comprises all-purpose litho paper coated on one side with the release coating applied to the non-coated side of litho all-purpose paper, or bond OCR; and where the paper weighs approximately 60 pounds per 3,000 square feet.