Pressure-adhesive correction materials and method for producing same

Claim 2

Process for producing latent adhesive pressure-sensitive elements comprising the steps of producing a composition comprising a soft, pressure-flowable tacky adhesive resin, a substantial amount of an inert, non-adhesive surface material and a volatile vehicle, applying said composition to a flexible, pressure-deformable foundation, and evaporating said vehicle to form a latent adhesive layer in which said adhesive resin is present adjacent said foundation and said surface material is present at the surface of said layer and provides a discontinuous barrier stratum which is substantially non-adhesive to the touch but which is penetrable by said flowable adhesive resin under the effects of applied pressure.

Claim 3

Process according to claim 1 in which said inert, non-adhesive surface material comprises a synthetic resinous binder material which is incompatible with said adhesive resin and the evaporation of said volatile vehicle produces a microporous skeletal structure of said resinous binder material containing within the pores thereof said pressure-flowable adhesive resin.

Claim 4

Process according to claim 1 in which said inert, non-adhesive surface material comprises polymer spheres having an average particle size between about 1 and 25 microns.

Claim 5

Process according to claim 1 in which said composition comprises said adhesive resin, an extender material comprising a synthetic resinous binder material which is not sticky or adhesive and which is compatible with said adhesive resin to form a resin blend having the desired degree of adhesiveness, and a finely-divided particulate material as said surface material, and the latent adhesive layer formed comprises said resin blend adjacent the foundation and said particulate material in the form of protrusions extending from said resin blend to form said discontinuous barrier stratum.

Claim 6

Latent adhesive pressure-sensitive elements comprising a flexible, pressure-deformable foundation supporting a latent adhesive layer comprising a soft, pressure-flowable tacky adhesive resin and a substantial amount of an inert, non-adhesive surface material, said adhesive resin being present adjacent said foundation and said surface material being present at the surface of said layer and providing a discontinuous barrier stratum which is substantially non-adhesive to the touch, said pressure-flowable adhesive resin being capable of flowing through said barrier stratum under the effects of applied pressure to render the surface of said layer adhesive in impressed areas.

Claim 7

Latent adhesive pressure-sensitive elements comprising a flexible, pressure-deformable foundation supporting a latent adhesive layer comprising a soft, pressure-flowable tacky adhesive resin and a substantial amount of an inert, non-adhesive surface material, said adhesive resin being present adjacent said foundation and said surface material being present at the surface of said layer and providing a discontinuous barrier stratum which is substantially non-adhesive to the touch, said pressure-flowable adhesive resin being capable of flowing through said barrier stratum under the effects of applied pressure to render the surface of said layer adhesive in impressed areas.

Claim 8

A latent adhesive pressure-sensitive element according to claim 5 in which said surface material comprises finely-divided, particulate surface material.

Claim 9

A latent adhesive pressure-sensitive element according to claim 6 in which said surface material comprises polymer spheres.

Claim 10

A latent adhesive pressure-sensitive element present to claim 5 in which said latent adhesive layer comprises a base coating of said adhesive resin and a surface coating of said non-adhesive surface material.

Claim 11

A latent adhesive pressure-sensitive element according to claim 5 in which said layer comprises a microporous skeletal network of said non-adhesive surface material having within the pores thereof said adhesive resin.

Claim 12

A latent adhesive pressure-sensitive element according to claim 5 in which said latent adhesive layer comprises a unitary layer comprising said soft, pressure-flowable adhesive resin, an extender material comprising a synthetic resinous binder material which is not sticky or adhesive and which is compatible with said adhesive resin to form a resin blend having the desired degree of adhesiveness, and a finely-divided particulate material as said surface material, said particulate material protruding above the surface of said resin blend to form said discontinuous barrier stratum.

Claim 13

Process for producing latent adhesive pressure-sensitive correction elements comprising the steps of producing a liquid composition comprising at least 10% by weight of the solids content as a soft, pressure-flowable adhesive resin, and at least 5% by weight of the solids content as an inert, non-adhesive, particulate surface material, applying said liquid composition to a flexible, pressure-deformable foundation, and causing it to solidify to form a latent adhesive layer in which said adhesive resin is present adjacent said foundation and at least 10% of the weight of said surface material projects beyond the surface of said layer and provides a barrier stratum which is substantially non-adhesive to the touch but which is penetrable by said flowable adhesive resin, at ambient temperatures, under the effects of applied pressure.

Claim 14

Process for producing latent adhesive pressure-sensitive correction elements comprising the steps of producing a liquid composition comprising at least 10% by weight of the solids content as a soft, pressure-flowable adhesive resin, and at least 5% by weight of the solids content as an inert, non-adhesive, particulate surface material, applying said liquid composition to a flexible, pressure-deformable foundation, and causing it to solidify to form a latent adhesive layer in which said adhesive resin is present adjacent said foundation and at least 10% of the weight of said surface material projects beyond the surface of said layer and provides a barrier stratum which is substantially non-adhesive to the touch but which is penetrable by said flowable adhesive resin, at ambient temperatures, under the effects of applied pressure.

Claim 15

Process according to claim 11 in which said liquid composition comprises a volatile liquid solvent for said adhesive resin, and the layer is caused to solidify by evaporation of said solvent.

Claim 16

Process according to claim 11 in which said liquid composition also comprises an extender binder material which is substantially less adhesive than said adhesive resin and which provides a mixture having the desired degree of adhesiveness.

Claim 17

Process according to claim 13 in which said extender binder material comprises a wax, said liquid composition is a hot-melt composition and said layer is caused to solidify by cooling.

Claim 18

Latent adhesive pressure-sensitive correction elements comprising a flexible, pressure-deformable foundation supporting a latent adhesive layer comprising at least about 10% by weight of a soft, pressure-flowable adhesive resin and at least about 5% by weight of a particulate, inert, non-adhesive surface material containing at least about 10% of the weight thereof in the form of large particles having a greater thickness than the thickness of said adhesive layer, said adhesive resin being present adjacent said foundation and said large particles of surface material projecting beyond the surface of said layer and providing a barrier stratum which is substantially non-adhesive to the touch, said pressure-flowable adhesive resin, at ambient temperatures, being capable of flowing through said barrier stratum under the effects of applied imaging pressure to render the surface of said layer adhesive in impressed areas.

Claim 19

Latent adhesive pressure-sensitive correction elements comprising a flexible, pressure-deformable foundation supporting a latent adhesive layer comprising at least about 10% by weight of a soft, pressure-flowable adhesive resin and at least about 5% by weight of a particulate, inert, non-adhesive surface material containing at least about 10% of the weight thereof in the form of large particles having a greater thickness than the thickness of said adhesive layer, said adhesive resin being present adjacent said foundation and said large particles of surface material projecting beyond the surface of said layer and providing a barrier stratum which is substantially non-adhesive to the touch, said pressure-flowable adhesive resin, at ambient temperatures, being capable of flowing through said barrier stratum under the effects of applied imaging pressure to render the surface of said layer adhesive in impressed areas.

Claim 20

A latent adhesive element according to claim 5 in which said particulate surface material comprises polymer spheres.

Claim 21

A latent adhesive element according to claim 15 in which said layer comprises an extender binder material which is substantially less adhesive than said adhesive resin and which provides a mixture having the desired degree of adhesiveness.

Claim 22

A latent adhesive element according to claim 17 in which said extender comprises a wax and said adhesive layer is applied as a hot-melt composition.

Claim 23

A latent adhesive element according to claim 17 in which said extender comprises a resin and said adhesive layer is applied as a solvent Coating.

Claim 24

A latent adhesive element according to claim 15 comprising a stripe of said latent adhesive layer and an adjacent stripe of pressure-transferable imaging composition, said imaging composition being imagewise pressure-transferable to a copy sheet under the effects of imaging pressure and said latent adhesive layer being capable of substantially completely removing said inagewise imaging composition from said copy sheet when impressed thereagainst with a corresponding imaging pressure.

Claim 25

Process for the selective and complete removal of an erroneous typed image from a copy sheet having said image thereon in association with a multiplicity of other images typed from the same imaging composition which comprises resinous binder material and pigment, said process comprising positioning over said images a latent adhesive correction element comprising a pressuredeformable foundation supporting a non-sticky latent adhesive layer which contains at least 10% by weight of an adhesive resin, which is pressure-flowable at ambient temperatures, and a nonadhesive surface material which provides a barrier stratum at said surface and renders said layer non-adhesive to the touch, and typing against the back of said foundation with a type face corresponding to the erroneous image to be removed and in a location corresponding to the position of said erroneous image to cause said latent adhesive correction element to be pressed against said erroneous image and to cause said adhesive resin to flow through said barrier layer and adhere to said erroneous image, and separating said correction element from said copy sheet whereby said erroneous image remains adhered to the former and is stripped from the latter without the correction sheet adhering to or disturbing the other images on the copy sheet.

Claim 26

Process for the selective and complete removal of an erroneous typed image from a copy sheet having said image thereon in association with a multiplicity of other images typed from the same imaging composition which comprises resinous binder material and pigment, said process comprising positioning over said images a latent adhesive correction element comprising a pressuredeformable foundation supporting a non-sticky latent adhesive layer which contains at least 10% by weight of an adhesive resin, which is pressure-flowable at ambient temperatures, and a nonadhesive surface material which provides a barrier stratum at said surface and renders said layer non-adhesive to the touch, and typing against the back of said foundation with a type face corresponding to the erroneous image to be removed and in a location corresponding to the position of said erroneous image to cause said latent adhesive correction element to be pressed against said erroneous image and to cause said adhesive resin to flow through said barrier layer and adhere to said erroneous image, and separating said correction element from said copy sheet whereby said erroneous image remains adhered to the former and is stripped from the latter without the correction sheet adhering to or disturbing the other images on the copy sheet.

Claim 27

Process according to claim 21 in which the correction element is sufficiently transparent that the images on the copy sheet can be read therethrough to facilitate visual segregation of the erroneous image.

Claim 28

Process according to claim 21 in which said latent adhesive layer comprises pressure-rupturable capsules of said surface material containing therein said pressure-flowable adhesive resin.

Claim 29

Process according to claim 21 in which said surface material comprises solid particles which project beyond the surface of said pressure-flowable adhesive resin.