Back to results
US 4,792,515 AGranted
Erasable diazotype material
AssigneeAndrews Paper & Chemical Co., Inc.
InventorsPeter Muller, Henry Mustacchi, George Schmitz
Life of this patent
Estimating the term…
Abstract
Erasable diazotype second originals on a translucent base have become very popular because they permit correcting, deletions and additions of new information to drawings without the need to redo an entire drawing. A new barrier film composition that acts simultaneously as matrix for the diazotype coating components and controls the ease of mechanical erasure is disclosed. The second originals exhibit almost film like reprographic continuity.
Claims6
An erasable diazotype reproduction material, which comprises;
- a base sheet having affixed to at least one surface thereof a coating which consists essentially of a mixture of polyvinylacetate resin and a compound selected from the group consisting of oxidized polyethylene, and a paraffin wax;
- said coating having a lower zone in contact with and bonded directly to the base sheet and an upper zone distal to the base sheet;
- said upper zone having dispersed therein diazotype components comprising a light-sensitive diazonium compound, an azo coupling compound and a pH stabilizing acid.
A stratified erasable diazotype material which, comprises;
- a natural base paper transparentized with an aqueous paraffin wax dispersion and coated with a layer consisting essentially of a polyvinyl acetate resin intermingled with a compound selected from the group consisting of an oxidized polyethylene resin or paraffin wax and having imbedded in it diazotype components consisting of a light-sensitive aromatic diazo compound, a stabilizing acid and an azo coupling compound.
Dependencies are inferred from the claim text.