Method of detackifying an edge face of a roll of tape

Details Method of detackifying an edge face of a roll of tape Method of detackifying an edge face of a roll of tape

2001-03-14

2003-09-23

Ahmad, Nasser (Department: 1772)

Stock material or miscellaneous articles

Layer or component removable to expose adhesive

Polymer derived only from ethylenically unsaturated monomer

C428S040100, C428S040200, C428S040500, C428S040900, C428S041400, C428S041500, C428S041700, C428S041800, C428S042100, C428S192000, C428S906000

Reexamination Certificate

active

06623825

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to detackifying the edge face of a roll of tape.
A roll of pressure sensitive adhesive tape is often prepared by applying a pressure sensitive adhesive composition to a backing and then winding the backing on a cylindrical core to form the roll of tape. The edge face of the roll of tape often includes exposed pressure sensitive adhesive, which renders the edge face tacky. In addition, when the tape is wound upon a cylindrical core to form a roll, uneven winding may occur which may cause variations in the edge face surface.
Multiple rolls of pressure sensitive adhesive are often packaged in a stack. When rolls of pressure sensitive adhesive tape are stacked on top of one another they tend to block, i.e., stick together. Blocking tends to increase in frequency and degree over time. The edge face of a roll of tape also tends to stick to its packaging, which can make removal of the roll of tape from the packaging difficult. Electrical tape, for example, which is often sold in plastic containers, tends to stick to the plastic walls of the container. The tacky nature of the edge face also tends to attract dust, dirt and other particles from the environment.
A number of methods have been developed to detackify the edge face of a roll of adhesive tape. One common method involves placing a sheet of paper in contact with the edge face, e.g., between two rolls of tape. Another method involves coating the edge face of a roll of tape with very small glass beads. The glass beads, however, tend to fall off of the roll and into the machinery used to manufacture the rolls of tape, which can damage the tape manufacturing machinery. Other methods include applying a detackifying agent to the edge of a strip of tape using a sponge or a cloth. The agent is applied prior to the strip of tape being wound upon a cylindrical core to form a roll.
SUMMARY
In one aspect, the invention features a method of detackifying an edge face of a roll of pressure sensitive adhesive tape, the method including a) contacting an edge face of the roll of tape with a non-free radically curable composition that includes water and film-forming agent, and b) drying the composition. In some embodiments, the film-forming agent includes a polymer selected from the group consisting of ethylene vinyl acetate, polyvinyl acetate, polyvinyl chloride, cellulose and combinations thereof. In other embodiments, the film-forming agent includes polyurethane. In another embodiment, the film-forming agent includes acrylic resin. In another embodiment, the film-forming agent is selected from the group consisting of wax and silicone. In one embodiment, the film-forming agent includes polyethylene wax.
In other embodiments, the composition further includes metal alkyl salt. In one embodiment, the composition further includes fumed silica.
In some embodiments, the roll of tape includes a backing includes a polymer and a pressure sensitive adhesive composition includes rubber. In one embodiment, the backing includes vinyl.
In another embodiment, the roll of tape includes a backing that includes a polymer impregnated fiber scrim and a pressure sensitive adhesive composition that includes rubber disposed on the backing.
In one embodiment, the roll of tape includes a backing that includes cellulose.
In other embodiments, the roll of tape includes a release liner. In some embodiments, the release liner includes polyethylene terephthalate.
In another embodiment, the method further includes contacting a second edge face of the roll of tape with a composition that includes water and film-forming agent, and drying the composition. In one embodiment, the method further includes substantially simultaneously contacting the first edge face with a coating composition and contacting the second edge face with a coating composition.
In another aspect, the invention features a roll of tape includes a first nontacky edge face, a second edge face opposite the first edge face, and an uncrosslinked coating disposed on the first edge face. In one embodiment, when a layer of the coated roll of tape is unwound from the roll, the coating remains adhered to the edge of the layer. In other embodiments, the roll of tape further includes a second uncrosslinked coating disposed on the second edge face, the second edge face being nontacky.
In one embodiment, the coating includes an agent selected from the group consisting of wax, silicone, and combinations thereof. In some embodiments, the average melting point of the wax is at least about 90° C.
In some embodiments, the roll of tape includes a backing includes a polymer and a pressure sensitive adhesive composition includes rubber. In one embodiment the coating includes metal alkyl salt.
In other embodiments, the roll of tape includes a backing includes a polymer and a pressure sensitive adhesive composition includes rubber. In another embodiment, the backing includes vinyl.
In one embodiment, the tape includes a backing includes a polymer impregnated fiber scrim, and a pressure sensitive adhesive composition that includes rubber disposed on the backing. In other embodiments, the roll of tape includes a backing includes cellulose. In another embodiment, the tape includes a pressure sensitive adhesive composition disposed on a release liner. In some embodiments, the release liner includes polyethylene terephthalate.
In another embodiment, the coating on the edge face is discontinuous.
In one embodiment, the coating includes wax selected from the group consisting of ethylene homopolymer wax, microcrystalline wax, polyethylene homopolymer wax, micronized polyolefin wax and combinations thereof.
In other aspects, the invention features a method of detackifying an edge face of a roll of pressure sensitive adhesive tape, the method includes a) contacting an edge face of the roll of tape with a hot melt composition includes wax and b) solidifying the composition. In one embodiment, the average melting point of the wax is at least about 90° C. In other embodiments, the wax is selected from the group consisting of ethylene homopolymer wax, microcrystalline wax, polyethylene homopolymer wax, micronized polyolefin wax and combinations thereof.
The detackified rolls of tape can be packaged without significant sticking to packaging materials such as plastic, cardboard and metal. The detackified rolls of tape can also be stacked upon each other edge face to edge face without blocking such that each detackified roll of tape can be easily removed from the stack. Rolls of tape that include the detackifying composition on their edge faces exhibit minimal to no particulate generation upon unwind or during use. Detackified edge faces of rolls of pressure-sensitive adhesive tape are also less apt to pick up dirt and other contaminates relative to edge faces that have not been detackified.
Other features and advantages of the invention will be apparent from the following description of the preferred embodiments thereof, and from the claims.
DETAILED DESCRIPTION
The method of detackifying the edge face of a roll of tape includes contacting a composition on the edge face of a roll of tape and drying or solidifying the composition to form a nontacky coating on the edge face of the roll of tape. Preferably the coating composition is present on both edge faces of the roll of tape such that the surface of each edge face is nontacky.
The composition is capable of forming a continuous coating upon drying, in the case of aqueous-based coating compositions, and solidifying in the case of hot melt coating compositions. The layer of coating composition present on the edge of the roll of tape is sufficiently thick to detackify the edge of the roll of tape and sufficiently thin such that the coating breaks at the layer interface when the layer of tape is unwound from the roll, i.e., the coating is frangible. The coating is capable of remaining adhered to the edge of the layer of adhesive tape (including the backing and the adhesive composition) with which it is associated prior to, during and after removal of

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