Receptive coating for pressure sensitive adhesive

Abstract: Supply paper (40) is provided at spaced longitudinal positions along one side with a repositionable adhesive (14). A receptive coating (16) comprised of a CF oil-based ink is applied at spaced longitudinal positions along the opposite of the paper, the positions along opposite sides of the paper being out of registration one with the other. The paper (40) is cut into strips, assembled to form pads (P) with the repositionable adhesive (14) holding the paper strips (18) one to the other at one end thereof. A paper strip (18) may be removed from the pad (P) and flexed to form a band with opposite ends overlying one another with the adhesive (14) in contact with the receptive coating (16). The repositionable adhesive (14) and receptive coating (16) cooperate to provide enhanced adhesion.

Description: BACKGROUND OF THE INVENTION The present invention relates to various types of paper products having a receptive coating for contact with a repositionable adhesive to provide enhanced adhesion and methods of making such paper products. Many paper products have been formed with permanent adhesive applied to a portion thereof for permanently adhering that portion to another paper portion, whether it be the same sheet or another sheet. That type of adhesive is well known for its substantial strength and frequently the paper must be torn before the adhesively-secured paper portions may be separated. In more recent years, repositionable adhesive has been developed. In one application, repositionable adhesive is applied to individual sheets or notes adjacent margins at one end thereof, with the sheets or notes provided in pad form and held together solely by the repositionable adhesive. The individual sheets may be readily removed from the underlying sheet and the removed sheet repositioned with the adhesive adhered to another surface. The tack of repositionable adhesives is thus somewhat reduced from that of the more permanent-type adhesives. Many additional applications have been developed using repositionable adhesive. However, the reduced tack or adhesive power of repositionable adhesive as compared with permanent type adhesives causes certain problems. For example, from the standpoint of its adhesion quality, there are a number of applications where it would be desirable to use repositionable adhesive but for its lack of substantial tack or adhesive holding power. Consequently, it is desirable in a substantial number of applications to enhance the adhesive power of repositionable adhesive such that it remains readily removable from its pre-use form, ie a pad, yet has enhanced adhesive qualities when put to final use. Also Swiss Patent No CH-A-452479 describes a paper pad with individual sheets held together at the top edges of the pad by a non-drying adhesive provided at the edge of each individual sheet and in which one side is smooth and adherent but does not take up the adhesive and the other side carries the adhesive. Also French Specification No FR-A-1480201 describes a continuous web having a band of adhesive on the front face of the web and a corresponding band of non-receptive coating on the rear face of the web. SUMMARY OF THE INVENTION According to the present invention, it has been discovered that the adhesion properties of repositionable adhesive, when contacted with a portion of the same or another sheet having a receptive coating, can be substantially enhanced beyond the adhesive properties of repositionable adhesive when contacted with a non-receptive coated surface. That is, according to the present invention, repositionable adhesive in contact with a receptive coating provides enhanced tack and greater adhesion. For example, repositionable adhesive may be applied to a portion of a sheet of paper. A receptive coating may be applied to a portion of the same or another sheet of paper. Preferably, the receptive coating is a CF (coated front) ink. When adhesive and receptive coated portions of the paper(s) are contacted one with the other, it has been discovered that the paper portions are adhesively secured one to the other in a manner exhibiting enhanced adhesive properties and tack. In this manner, a more secure adhesive joint using respositionable adhesive is obtained in comparison with using repositionable adhesive for joining sheets without a receptive coating. In one aspect the invention provides a pad (P) comprising: multiple sheets of material; means adjacent one end of each sheet for releasably securing said sheets one to the other to form said pad including repositionable adhesive applied on one side of each sheet adjacent said one end thereof; and characterised in that a receptive coating is applied on the opposite side of each sheet adjacent the opposite end thereof such that, upon removal of the individual sheets from the pad, each sheet may be flexed to locate its opposite ends in overlying relation with one another and with said adhesive and said receptive coating in contact one with the other thereby adhesively securing said opposite ends together. In another aspect the invention provides a strip of sheet material, comprising: a repositionable adhesive applied on one side of said sheet adjacent one end thereof; characterised by a receptive coating applied on the opposite side of said sheet adjacent the opposite end thereof such that said sheet may be flexed to locate its opposite ends in overlying relation one with the other with said adhesive and said receptive coating contacting one another thereby adhesively securing said opposite ends together, said adhesive and said receptive coating being cooperable with one another to form an adhesive connection between the opposite sheet ends stronger than an adhesive connection using solely said repositionable adhesive in contact with sheet material without said receptive coating. In a further aspect the invention provides a method of forming a paper product from a supply roll of paper comprising the steps of: applying a repositionable adhesive on one side of at least a portion adjacent one end of a length of the paper supplied from the supply roll; applying a receptive coating on the other side to at least a portion adjacent the other end of the paper length; and cutting the supply roll into such paper lengths. Embodiments of the invention will now be described by way of example, only, with reference to the accompanying drawings of which: Figure 1 is a perspective view illustrating a pad of paper strips, with one detached, employing the respositionable adhesive and receptive coating of the present invention; Figure 2 is a perspective view of a single paper strip of the pad of Figure 1 with its opposite ends joined one to the other to form a continuous band; and Figure 3 is a schematic drawing illustrating a method of manufacturing the paper strip illustrated in Figure 2. In these embodiments repositionable adhesive may be of the type used by Moore Business Forms, Inc., identified as NOTE STIX ™ , but may be any conventional type of repositionable adhesive. A receptive coating according to the present invention may comprise any type of coating to a paper product which, when contacted by a repositionable adhesive applied to the same or another paper, enhances the tack and adhesion quality of the repositionable adhesive and thus strengthens the adhesive joint beyond the strength of such joint using repositionable adhesive without contacting a receptive coating. In a preferred embodiment hereof, the receptive coating may comprise a CF (coated front) type ink, such as set forth in U.S. Patents Nos. 4,165,102; 4,165,103; 4,166,644; and 4,188,456. While the CF inks of these patents are water-based, preferably an oil-based CF ink is employed herein. While CF inks per se are known and have been used in the printing industry, it has been discovered, according to the present invention, that the tack or adhesive holding power of repositionable adhesive in contact with a receptive coating comprised of CF ink is substantially improved. In Figure 1, there is illustrated an example of a paper product of the present invention used to form bands or wrappers, for example, shirt bands or money wrappers. In Figure 1, a pad P of sheet material, preferably paper is provided, in the form of a plurality of strips of paper releasably secured one to the other adjacent one end. For example, the strips of paper are releasably secured one to the other similarly as the notes of commercial note pads are releasably secured one to the other to form a pad for individual removal and adhesion to other surfaces. More particularly, the pad includes a plurality of strips 18 having adjacent one end thereof repositionable adhesive 20 applied to the underside of the strip for adhering the strip to the underlying strip 18. Thus, a plurality of strips 18 are releasably secured one to the other by means of the repositionable adhesive 20 applied to the underside of each strip 18 adjacent an end thereof for adhering that strip to the upper surface of the underlying strip at the like end of the pad. A backing strip 21 is provided as the undersurface of the pad. A release coating on surface 18 may be necessary for satisfactory removal. At the opposite end of the pad P, a receptive coating 22 is applied adjacent the end margin but on the opposite side of the strip from the side on which the repositionable adhesive is applied. The receptive coating, preferably a CF oil-based ink, has no adhesive qualities per se and, consequently, the ends of the paper strips opposite the ends bearing the repositionable adhesive are not adhered to and are relatively free from one another. When the individual strips are removed from the pad, each strip may be folded or flexed over, as illustrated in Figure 2, such that the portions of the strips bearing the repositionable adhesive and the receptive coating can be placed in contact one with the other whereby opposite ends of the strips are adhesively secured one to the other. As noted previously, the respositionable adhesive interacts with the receptive coating to enhance the strength of the adhesive joint between the opposite ends of the strip. Referring now to Figure 3, there is illustrated a method of forming the strips with the repositionable adhesive and receptive coating illustrated in Figures 1 and 2. Particularly, a supply roll 30 of sheet material, preferably paper, in a width which is a multiple of the width of the final strip of paper, supplies paper between a first pair of rollers 32. The lower roller 34 applies a coating, for example, a water repellent and release agent for hydrophilic surfaces, to the underside of the paper. This coating may be of the type sold under the tradename Quilon® and the curing of the coating on the underside of the paper is enhanced by a dryer 36. Subsequent to dryer 36, there is provided a tie coat applying station, including a roller 38, for applying the tie coat along the supply strip 40. The tie coat is cured on the supply strip 40 by a dryer 42. The supply strip with the water repellent and release coating along its underside and tie coat along its upper side are passed between a pair of rolls 44 and 46. The upper roll 44 of the pair of rolls 44 and 46 applies the repositional adhesive at spaced longitudinal locations along the supply strip. A subsequent dryer 48 cures the repositional adhesive on the strip. A slitter is provided at station 50 for slitting supply stock 40 into widths corresponding to the width of the strips to be formed and supplied in the form of the pad, for example, as illustrated in Figure 1. The longitudinally-slit supply stock is inverted and then passed between a pair of rolls 52 and 54. Upper roll 52 applies the receptive coating, i.e., the oil-based CF ink, at periodic intervals along the upper surface of the supply stock after the stock has been inverted, i.e., to the surface of the strip opposite the adhesive. Particularly, the receptive coating is applied to the upper surface in areas out of alignment or registry with the repositionable adhesive applied to the opposite side of the stock but closely adjacent thereto so that the stock may be appropriately cut into strips. The next station is a print station, where printing, as desired, may be provided on the upper surface, i.e., the surface coated with the water repellent and release agent Quilon®. The completed stock is then passed through a slitter station 58 at which the stock is cut into the appropriate lengths or strips along a transverse line of demarcation between the underlying repositionable adhesive and the overlying receptive coating. The individual strips are then disposed one on top of the other in pad form by conventional means and this is schematically represented at 60.

Claims: A pad (P) comprising: multiple sheets (18) of material; means adjacent one end of each sheet (18) for releasably securing said sheets one to the other to form said pad including repositionable adhesive (20) applied on one side of each sheet (18) adjacent said one end thereof; characterised in that a receptive coating (22) is applied on the opposite side of each sheet (18) adjacent the opposite end thereof such that, upon removal of the individual sheets from the pad, each sheet (18) may be flexed to locate its opposite ends in overlying relation with one another and with said adhesive (20) and said receptive coating (22) in contact one with the other thereby adhesively securing said opposite ends together. A pad (P) according to Claim 1 wherein said repositionable adhesive (20) constitutes the sole securement of said sheets (18) to one another and to said pad (P) thereof. A pad according to Claim 1 or 2 wherein said adhesive (20) and said receptive coating (22) cooperate with one another to form an adhesive connection between the opposite sheet ends stronger than an adhesive connection using solely said repositionable adhesive without said receptive coating. A pad according to Claim 1, 2 or 3 wherein said pad (P) includes a backing sheet (21) underlying all the sheets in said pad. A pad according to anyone of the preceding claims wherein said receptive coating is comprised of an oil based CF ink. A pad according to Claim 1 wherein said respositionable adhesive constitutes the sole securement of said sheets to one another and to said pad, said adhesive and said receptive coating cooperating one with the other to form an adhesive connection between the opposite sheet ends stronger than an adhesive connection using solely said repositionable adhesive without said receptive coating and said coating is comprised of an oil based CF ink. A strip (18) of sheet material, comprising: a repositionable adhesive (20) applied on one side of said sheet (18) adjacent one end thereof; characterised by a receptive coating (22) applied on the opposite side of said sheet (18) adjacent the opposite end thereof such that said sheet (18) may be flexed to locate its opposite ends in overlying relation one with the other with said adhesive (20) and said receptive coating (22) contacting one another thereby adhesively securing said opposite ends together, said adhesive (20) and said receptive coating (22) being cooperable with one another to form an adhesive connection between the opposite sheet ends stronger than an adhesive connection using solely said repositionable adhesive in contact with sheet material without said receptive coating. A strip (18) according to Claim 7 wherein said receptive coating is comprised of a CF (coated front) oil based ink. A strip (18) according to Claim 7 wherein said strip is elongated and said adhesive (20) and said receptive coating (22) are applied to the opposite ends of said strip (18). A method of forming a paper product (60) from a supply roll (30) of paper comprising the steps of : applying a repositionable adhesive (20) on one side of at least a portion adjacent one end of a length of the paper supplied from the supply roll (30); applying a receptive coating (22) on the other side to at least a portion adjacent the other end of the paper length; and cutting the supply roll into such paper lengths. A method according to Claim 10 including applying the repositionable adhesive (20) at spaced longitudinal positions along the paper supplied from the supply roll (30). A method according to Claim 10 including applying the receptive coating (22) at spaced longitudinal positions along the paper supplied from the supply roll.

Inventors: GREIG WALTER G, MCINTYRE TIMOTHY J, GREIG, WALTER G., MCINTYRE, TIMOTHY J.
Applicants: MOORE BUSINESS FORMS INC, MOORE BUSINESS FORMS, INC.
Application year: 1989
Main classification: B42D5
IPC codes: B42D15, B42D5