Pressure sensitive carbonless imaging system incorporating uncolored ferric organophosphates and uncolored chelates
AssigneeMinnesota Mining and Manufacturing Company
InventorsDavid R. Whitecomb, Loren D. Albin
Life of this patent
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Abstract
Pressure sensitive imaging materials are colorless until pressure addressed, but thereafter provide an intense dark image. The materials comprise white ferric organophosphate, ferric organophosphinate, or ferric organophosphonate and a colorless chelate. The choice of substituents on the chelate nucleus can give images with both good discrimination visually and to near infrared radiation (NIR).
Claims23
A colorless pressure sensitive imaging system comprising a substrate having coated on one surface thereof or dispersed therein a first component comprising a colorless chelate selected from aromatic or alkyl ligands having either neutral donors or at least one ionizable hydrogen, or both, and which react with iron (III) to form colored complexes;
- and a second component in such physical relationship with said substrate that said second component will contact said first component upon the application of pressure to said substrate, said second component comprising a colorless ferric iron compound selected from ferric organophosphates, ferric organophosphinates and ferric organophosphonates which react with said colorless chelate upon contact to form a visible color.
A method of generating a visible image on the surface of a substrate, said image comprising a representation of the characteristic pattern of raised and recessed portions of the external surface of the skin covering the hands, fingers, feet and toes of the human body, comprising:
- (a) providing a first substrate, selected from the group consisting of the hands, fingers, feet and toes of the human body, having coated thereon a component comprising a colored chelate selected from aromatic or alkyl ligands having either neutral donors or at least one ionizable hydrogen, or both, and which react with iron (III) to form colored complexes;
- (b) providing a second substrate having coated thereon a component comprising a colorless ferric iron compound selected from ferric organophosphates, ferric organophosphinates and ferric organophosphonates which react with said colorless chelate upon contact to form a visible color;
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- (c) pressing said first and second substrates together such that said colorless chelate contacts said colorless ferric iron compound and reacts therewith to form a visible colored image on the surface of said second substrate comprising a representation of said characteristic pattern on the surface of said first substrate.
A method of generating a visible image on the surface of a substrate, said image comprising a representation of the characteristic pattern of raised and recessed portions of the external surface of the skin covering the hands, fingers, feet and toes of the human body, comprising:
- (a) providing a first substrate having coated thereon a component comprising a alkyl ligands having either neutral donors or at least one ionizable hydrogen, or both, and which react with iron (III) to form colored complexes;
- (b) providing a second substrate, selected from the group consisting of the hands, feet, fingers and toes of the human body, having coated thereon a component comprising a colorless ferric iron compound selected from ferric organophosphates, ferric organophosphinates and ferric organophosphonates which react with said colorless chelate upon contact to form a visible color;
- and
- (c) pressing said first and second substrates together such that said colorless chelate contacts said colorless ferric iron compound and reacts therewith to form a visible colored image on the surface of said first substrate comprising a representation of said characteristic pattern on the surface of said second substrate.
Dependencies are inferred from the claim text.