Abstract:
Pressure-sensitive reusable transfer elements of the squeeze-out type having a microporous resinous ink-releasing layer firmly bonded to a flexible foundation. The invention is characterized by the use of a bonding layer which is applied to the foundation as an aqueous composition comprising a mixture of two waterdispersible resinous binder materials, one of which is watersoluble and does not insolubilize on drying and the other of which is insoluble in water in that it forms a water-insoluble film on drying.
Abstract:
Pressure-adhesive correction sheets and ribbons which carry a latent adhesive layer which has a surface which is not sticky to the touch but which becomes sticky in areas subjected to applied imaging pressure. The present materials are used for the impactremoval of erroneous images from a copy sheet, which images consist of complementary transfer composition applied by means of a complementary transfer element, including split imaging ribbons carrying both said complementary transfer composition and said latent adhesive correction composition.
Abstract:
Process for producing novel pressure-sensitive transfer elements capable of producing sharp, clear images on a variety of surfaces. The transfer elements are provided with a supercoating which is clean, non-adhesive to the touch so as to avoid sticking and blocking, and which has the ability to adhere to a variety of surfaces under the effects of imaging pressure and to carry with it an underlying imaging layer even though the latter may be so hard, for smudge-resistant purposes, as to have normally poor pressure-transferability per se. The present supercoatings comprise a combination of a normally tacky synthetic thermoplastic resinous binder material and a multiplicity of discrete microspheres of a synthetic resin which is inert with respect to the binder material and insoluble in the volatile solvent used to apply the supercoating.
Abstract:
Method for producing novel reusable pressure-sensitive transfer elements by solvent-coating techniques in which a composition comprising resinous film-forming binder material, incompatible oil, coloring matter and an aqueous vehicle is coated onto a flexible foundation and dried by evaporation of the aqueous vehicle. Transfer elements which are curl-resistant and substantially free of undesirable surface ink migration or ''''sweating'''' result from the use of a mixture of certain amounts of water-dispersible resinous film-forming binder materials comprising from 40 to 80% by weight of a water-insoluble filmformer and from 60 to 20% by weight of a water-soluble filmformer.