Pressure-activated and non-tacky lift-off element and process therefor

Claim 2

A pressure-activated element comprising: a flexible, pressure-deformable flexible film substrate foundation supporting a removal adhesive layer for removing typed or printed errors or the like; said removal adhesive layer consisting essentially of a resin and an amide wax combined as a homogeneous coating such that said adhesive layer is substantially homogeneous and of uniform thickness providing a continuous stratum which is substantially non-tacky to the touch.

Claim 3

An element according to claim 1 wherein the wax is a synthetic amide wax product which is relatively non-crystalline and has a melting point of substantially 100° to 108° C.

Claim 4

An element according to claim 1 wherein the substrate is a film of one Of the following groups of films, nylon, polyethylene, polypropylene, or polyester.

Claim 5

An element according to claim 1 wherein the solvent is evaporated after the coating is applied to said flexible film substrate.

Claim 6

A pressure-activated element according to claim 1 in which said resin is a polyamide resin.

Claim 7

A pressure-activated element according to claim 5 in which the adhesive layer is applied to said flexible film substrate with a solvent.

Claim 8

An element according to claim 5 wherein the synthetic non-crystalline amide wax comprises 35 to 65% of the non-tacky coating on the substrate after the solvent has been evaporated.

Claim 9

A tape element according to claim 5 wherein the synthetic non-crystalline amide wax comprises 45 to 55% of the non-tacky coating on the substrate after the solvent has been evaporated.

Claim 10

A non-tacky lift-off element for use as a tape, ribbon, sheet or tab for removing printed characters comprising: a flexible film substrate; a non-tacky coating on the substrate consisting essentially of: a synthetic non-crystalline amide wax; a polyamide resin and plasticizers therefor, and a solvent; and wherein the solvent is less than 80% of the coating by weight upon application of the coating to the substrate.

Claim 11

A non-tacky lift-off element for use as a tape, ribbon, sheet or tab for removing printed characters comprising: a flexible film substrate; a non-tacky coating on the substrate consisting essentially of: a synthetic non-crystalline amide wax; a polyamide resin and plasticizers therefor, and a solvent; and wherein the solvent is less than 80% of the coating by weight upon application of the coating to the substrate.

Claim 12

An element according to claim 9 wherein the wax is a synthetic amide wax product which is relatively non-crystalline and has a melting point of substantially 100° to 108° C.

Claim 13

An element according to claim 9 wherein the substrate is a film of one of the following groups of films, nylon, polyethylene, polypropylene, or polyester.

Claim 14

An element according to claim 9 wherein the solvent is evaporated after the coating is applied to said flexible film substrate.

Claim 15

An element according to claim 10 wherein the synthetic non-crystalline amide wax comprises 35 to 65% of the non-tacky coating on the substrate after the solvent has been evaporated.

Claim 16

A tape element according to claim 10 wherein the synthetic non-crystalline amide wax comprises 45 to 55% of the non-tacky coating on the substrate after the solvent has been evaporated.

Claim 17

A process for producing pressure-activated elements for removing types or printed errors or the like comprising the steps of producing a composition consisting essentially of: a resin; and between 14 to 26% by weight of an amide wax material; and between 42 and 78% by weight of a volatile solvent vehicle consisting of an alcohol, toluene, or mixture thereof; and subsequently applying said composition to a flexible, pressure-deformable foundation, and then evaporating said vehicle to form an adhesive layer on the foundation in which said adhesive layer is substantially homogeneous and of uniform thickness and provides a continuous stratum which is substantially non-tacky.

Claim 18

A process for producing pressure-activated elements for removing types or printed errors or the like comprising the steps of producing a composition consisting essentially of: a resin; and between 14 to 26% by weight of an amide wax material; and between 42 and 78% by weight of a volatile solvent vehicle consisting of an alcohol, toluene, or mixture thereof; and subsequently applying said composition to a flexible, pressure-deformable foundation, and then evaporating said vehicle to form an adhesive layer on the foundation in which said adhesive layer is substantially homogeneous and of uniform thickness and provides a continuous stratum which is substantially non-tacky.