Adhesively securable stock packaging materials
View Patent ↗Stock packaging materials for manual and/or high speed industrial automated package formation and/or filing and closing applications having a curable pre-applied adhesive compositions applied to one or more seams or closure surfaces wherein the curative for the pre-applied adhesive composition is contained within a carrier which prevents its premature release.
1. Stock packaging materials having a substantially dry-to-the-touch, curable, pre-applied adhesive composition on at least one bonding surface thereof wherein said pre-applied adhesive composition comprises an encapsulated liquid curable material and a separately encapsulated curative complex, said curative complex being encased in a polymer capsule and comprising an in-situ formed carrier material and an effective amount of a curative or combination of curatives contained in the carrier material and capable of effecting, directly or indirectly, the cure of the aforementioned liquid curable material, said carrier material being a natural or synthetic material or composition that is substantially non-flowing in the absence of external forces, elevated temperatures or both impacting upon said curative complex wherein the in-situ formed carrier material is formed by the action of a curative with or on a precursor composition for said carrier material and either (i) the curative for the in-situ formed carrier material is different from and in addition to the curative contained in said carrier material or (ii) the curative for the in-situ polymerized carrier material is the same as the curative contained in the carrier and the amount of the curative prior to in-situ polymerization of the carrier material is at least 1.6 weight % based on the weight of the carrier material and the amount of curative remaining after polymerization of the carrier material is effective for effecting cure of the liquid curable material.
2. The stock packaging materials of claim 1 wherein the stock packaging material is in the form of sheets or bulk rolls from which packaging blanks will be cut.
3. The stock packaging materials of claim 2 wherein the pre-applied adhesive is applied in a repetitive pattern to said sheets or bulk rolls wherein the surface area to which the pre-applied adhesive has been applied corresponds to a seam, flap, tab, flange or closure member of the finished package.
4. The stock packaging materials of claim 1 wherein the stock packaging material is in the form of packaging blanks or semi-finished packaging wherein the pre-applied adhesive is applied to one or more flaps, seams, tabs or closure members.
5. The stock packaging materials of claim 1 wherein the stock packaging material is to be used in the production of a container selected from the group consisting of cartons, boxes, cases, trays, envelopes, bags, mailers, tubes, cores and cups.
6. The stock packaging materials of claim 5 wherein the tubes and cores are wound from one or more strips of the stock packaging material having the pre-applied adhesive along one or both edges of the strips.
7. The stock packaging materials of claim 1 comprising a synthetic material.
8. The stock packaging materials of claim 7 wherein the synthetic material is selected from the group consisting of polyesters, polypropylenes, polyethylenes, low density polyethylenes, high density polyethylenes, linear low density polyethylenes, styrene, and polyamides.
9. The stock packaging materials of claim 8 wherein the synthetic material is in the form of non-woven fabrics or sheets of synthetic fibers.
10. The stock packaging materials of claim 1 comprising a cellulosic material.
11. The stock packaging materials of claim 10 wherein the cellulosic material is selected from the group consisting of paper, paperboard, corrugated paperboard, chipboard, boxboard, cardboard, paperboard laminates, multiply paperboard, and chemically modified cellulosics.
12. The stock packaging materials of claim 11 wherein the cellulosic material is paperboard.
13. The stock packaging materials of claim 11 wherein the cellulosic material is a paperboard laminate having one or more layers of paperboard and one or more layers of a synthetic polymer film or sheet or a metal foil or both.
14. The stock packaging materials of claim 10 comprising rayon or cellulose acetate fibers.
15. The stock packaging materials of claim 1 further comprising a synthetic film or sheet or a metal foil or both.
16. The stock packaging materials of claim 1 further comprising a coating.
17. The stock packaging materials of claim 1 wherein the coating is selected from the group consisting of thermoplastic coatings, thermoset coatings, clays, and varnishes.
18. The stock packaging materials of claim 16 wherein the coating is a thermoplastic coating selected from the group consisting of polyethylene, polypropylene, Mylar, polyvinylidene chloride, ethylene vinyl acetate, and waxes.
19. The stock packaging materials of claim 1 wherein the carrier material is (a) of a soft, putty-like or gel-like character or (b) a solid or semi-solid that is (i) soluble in the liquid curable material, (ii) softened by the liquid curable material, (iii) softened by the reaction conditions for effecting cure of the liquid curable material, (iv) softened by the environmental conditions under which liquid curable material is to be cured, (v) is softened by the method or process by which the curative is to be made available to other components of the curable composition, (vi) rendered flowable by the liquid curable material, (vii) rendered flowable by the reaction conditions for effecting cure of the liquid curable material, (viii) rendered flowable by the environmental conditions under which the liquid curable material is cured, (ix) is rendered flowable by the method or process by which the curative is to be made available to other components of the curable composition with which they are to be used.
20. The stock packaging materials of claim 1 wherein the carrier material is of a soft putty-like or gel-like character and comprises a thixotropic or thickened composition of monomers, oligomers or pre-polymers, or a combination thereof, which composition is substantially non-reactive with the curative in the encapsulated state.
21. The stock packaging materials of claim 1 wherein the carrier material includes or comprises one or more thixotropic agents or one or more thixotropic or non-thixotropic gelling or thickening agents that are generated in-situ or act latently concurrent with or following encapsulation of the carrier material.
22. The stock packaging materials of claim 1 wherein the carrier material is selected from the group consisting of hot melts, pressure sensitive adhesives, rubber materials, elastomer/tackifier compositions, a polymer whose Tg is less than 35° C., semi-solid and solid resins, starches and starch-based polymers, hydrogels, low temperature waxes and a thickened or gel-like mass of one or more monomers, oligomers, prepolymers or combinations thereof.
23. The stock packaging materials of claim 1 wherein the carrier material is an adhesive or has latent adhesive properties.
24. The stock packaging materials of claim 1 wherein the carrier material does not flow or deform except when subjected to forces of at least 1 psi.
25. The stock packaging materials of claim 1 wherein the carrier material is formed concurrent with the encapsulation of the curative complex.
26. The stock packaging materials of claim 1 wherein liquid curable material comprises one or more liquid curable monomers, oligomers or prepolymers or combinations thereof.
27. The stock packaging material of claim 1 wherein the liquid curable material is selected from the group consisting of monomers, oligomers and/or prepolymers that undergo vinyl polymerization; unsaturated polyesters; urethanes; epoxy resins; polysulfides; isocyanates; silicones; polyethers, polyurethanes and polyolefins having silanol moieties capable of undergoing silanol condensation or hydrosilation reactions; and phenoxy resins.
28. The stock packaging material of claim 1 wherein both the encapsulated liquid polymerizable material and the encapsulated curative complex are discrete microcapsules held to the surface of the stock packaging material by a binder material.
29. The stock packaging material of claim 28 wherein the binder material is an adhesive or a coating material.
30. The stock packaging material of claim 28 wherein the binder material is an actinic radiation cured composition.
31. The stock packaging material of claim 28 wherein the binder material is an aqueous emulsion.
32. The stock packaging materials of claim 1 wherein the carrier material is formed subsequent to the encapsulation of the curative complex.