Compositions for eradicating electrophotographic images from translucent paper
AssigneeAddressograph Multigraph Corporation
InventorsRonald D. Arena, Eric G. Lowry
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Abstract
Compositions useful for eradicating images which have been produced upon paper by electrophotographic or similar means are provided. Suitable formulations include an alcohol having 1 to 3 carbon atoms or a nitrile having 2 to 3 carbon atoms and are derived from a solvent formulating map prepared from a plot of hydrogen bonding indices against solubility parameters. In general such formulations include a mixture of solvents and may include a ketone or ester in addition to such alcohol or nitrile.
Claims4
A composition for eradicating electrophotographic images from paper which comprises a solvent mixture, the Cartesian coordinates of which fall within the quadrangle bounded by the coordinates (9.8, 3.7), (10.0, 6.0) (13.7, 8.5) and (11.5, 4.0) on the Hydrogen Bonding Index (.delta.) versus Solubility Parameter (.delta.) plot of the drawing, said solvent mixture containing a nitrile having from 2 to 3 carbon atoms, and a solvent selected from the group consisting of ketones and esters having up to 4 carbon atoms.
A process for eradicating an electrophotographic image from paper comprising applying to the image to be eradicated a composition which comprises a solvent mixture, the Cartesian coordinates of which fall within the quadrangle bounded by the coordinates (9.8, 3.7), (1.0, 6.0), (13.7, 8.5), and (11.5, 4.0), on the Hydrogen Bonding Index (.delta.) versus Solubility Parameter (.gamma.) plot of the drawing, said solvent mixture containing
- a. a member selected from the group consisting of an aliphatic alcohol having from 1 to 3 carbon atoms and a nitrile having from 2 to 3 carbon atoms and
- b. at least one other solvent selected from the group consisting of
- acetone
- acetonitrile
- acrylonitrile
- benzene
- cyclohexane
- diethyl ether
- dimethylformamide
- dimethyl sulfoxide
- ethanol
- ethyl acetate
- isopropanol
- methanol
- methyl cellosolve
- methylene chloride
- nitromethane
- 2-nitropropane
- n-propanol
- propionitrile
- toluene
- trichloroethylene and
- water, the coordinates of which solvent mixture satisfy the relationship
- .delta..sub.M = .delta..sub.1 V.sub.1 + .delta..sub.2 V.sub.2 + . . . .delta..sub.i V.sub.i
- .gamma..sub.M = .delta..sub.1 V.sub.1 + .delta..sub.2 V.sub.2 + . . . .delta..sub.i V.sub.i
- where .delta..sub.1, .delta..sub.2, etc. are individual solubility parameters of the respective solvents 1, 2, etc. consituting the solvent mixture and .gamma..sub.1, .gamma..sub.2, etc. are individual hydrogen bonding indices of the solvents and V.sub.1, V.sub.2, etc. are volume fractions of the solvent components.
A process according to claim 4 wherein said solvent mixture contains a nitrile and a solvent selected from the group consisting of ketones and esters having up to 4 carbon atoms.
Dependencies are inferred from the claim text.