Photosensitive composition containing TiO{HD 2 {B having a particle size of about 25 millimicrons and the use thereof in physical development

Claim 2

IN A DATA STORAGE MEDIUM COMPRISING A SUBSTRATE AND A RADIATION SENSITIVE COATING THEREON, SAID COATING CONSISTING ESSENTIALLY OF PARTICULATE TITANIUM DIOXIDE DISPERSED IN A BINDER, SAID MEDIUM BEING SUITABLE FOR USE IN A PROCESS WHEREIN SAID MEDIUM IS EXPOSED IMAGEWISE AND CONTACTED WITH A PHYSICAL DEVELOPER COMPRISING A SOLUTION OF METAL IONS AND A REDUCING AGENT FOR SAID METAL IONS TO PRODUCE A VISIBLE IMAGE IN SAID MEDIUM, THE IMPROVEMENT WHEREIN SAID PARTICULATE TITANIUM DIOXIDE HAS AN AVERAGE PARTICLE SIZE OF ABOUT 25 MILLIMICRONS.

Claim 3

Improvement as in claim 1 wherein said substrate is transmissive of visible light.

Claim 4

Improvement as in claim 1 wherein said medium includes a dye sensitizer.

Claim 5

Improvement as in claim 1 wherein said metal ions are silver ions.

Claim 6

Improvement as in claim 1 wherein said coating was formed by applying an aqueous dispersion of titanium dioxide to said substrate, said aqueous dispersion comprising an aqueous suspending liquid, said particulate titanium dioxide, a dispersing agent and an organic binder.

Claim 7

A pellucid data storage medium suitable for projection viewing after development of an image therein by means of contacting the imagewise exposed medium with a redox developer composition comprising a solution of metals ions, said medium comprising A light transmissive substrate and a radiation sensitive coating thereon said coating being no more than about 10 mils thick and consisting essentially of a binder and dispersed therein, a particles of titanium dioxide having an average particle size less than 100 millimicrons, the ratio of said solid binder being from about 8 parts by weight of titanium dioxide to 1 part by weight binder solids to about 1 part by weight titanium dioxide to about 4 parts by weight binder solids and the coating weight being less than about 20 pounds of coating per 3,000 square feet of substrate, the improvement wherein said titanium dioxide has an average particle size of of about 25 millimicrons.

Claim 8

A pellucid data storage medium suitable for projection viewing after development of an image therein by means of contacting the imagewise exposed medium with a redox developer composition comprising a solution of metals ions, said medium comprising A light transmissive substrate and a radiation sensitive coating thereon said coating being no more than about 10 mils thick and consisting essentially of a binder and dispersed therein, a particles of titanium dioxide having an average particle size less than 100 millimicrons, the ratio of said solid binder being from about 8 parts by weight of titanium dioxide to 1 part by weight binder solids to about 1 part by weight titanium dioxide to about 4 parts by weight binder solids and the coating weight being less than about 20 pounds of coating per 3,000 square feet of substrate, the improvement wherein said titanium dioxide has an average particle size of of about 25 millimicrons.

Claim 9

Medium as in claim 6 wherein the titanium dioxide is produced by pyrolosis of titanium tetrachloride.

Claim 10

In a process of recording an image pattern of activating radiation by imagewise exposing and contacting with a physical developer comprising a solution of metal ions and a reducing agent for said metal ions a data storage medium comprising titanium dioxide, the improvement wherein the titanium dioxide has an average particle size of about 25 millimicrons.

Claim 11

In a process of recording an image pattern of activating radiation by imagewise exposing and contacting with a physical developer comprising a solution of metal ions and a reducing agent for said metal ions a data storage medium comprising titanium dioxide, the improvement wherein the titanium dioxide has an average particle size of about 25 millimicrons.

Claim 12

Improvement as in claim 8 wherein said metal ions are silver ions.

Claim 13

Improvement as in claim 8 wherein said titanium dioxide is dispersed in an organic binder.

Claim 14

Improvement as in claim 8 wherein said data storage medium is formed by coating a substrate with an aqueous dispersion comprising an aqueous suspending liquid, said titanium dioxide, a dispersing agent, and an organic binder.

Claim 15

IN A PROCESS OF RECORDING AN IMAGE PATTERN OF ACTINIC LIGHT BY EXPOSING TO AN IMAGE PATTERN OF ACTINIC LIGHT A DATA STORAGE MEDIUM COMPRISING A PARTICULATE TITANIUM DIOXIDE IN AN ORGANIC BINDER WHICH TITANIUM DIOXIDE BECOMES REVERSIBLY ACTIVATED BY SUCH EXPOSURE AND THEREBY CAPABLE OF CAUSING CHEMICAL REACTIONS AT PORTIONS OF SAID MEDIUM CORRESPONDING TO SAID IMAGE PATTERN OF ACTINIC LIGHT AND THEN APPLYING TO AT LEAST REVERSIBLY ACTIVATED PORTIONS OF SAID MEDIUM A PHYSICAL DEVELOPER COMPRISING A SOLUTION OF METAL IONS AND A REDUCING AGENT FOR SAID METAL IONS WHICH FORMS METAL IMAGES SOLELY ON CONTACT WITH AT LEAST ACTIVATED PORTIONS OF SAID DATA STORAGE MEDIUM, THE IMPROVEMENT WHEREIN THE TITANIUM DIOXIDE HAS AN AVERAGE PARTICLE SIZE OF ABOUT 25 MILLIMICRONS.

Claim 16

IN A PROCESS OF RECORDING AN IMAGE PATTERN OF ACTINIC LIGHT BY EXPOSING TO AN IMAGE PATTERN OF ACTINIC LIGHT A DATA STORAGE MEDIUM COMPRISING A PARTICULATE TITANIUM DIOXIDE IN AN ORGANIC BINDER WHICH TITANIUM DIOXIDE BECOMES REVERSIBLY ACTIVATED BY SUCH EXPOSURE AND THEREBY CAPABLE OF CAUSING CHEMICAL REACTIONS AT PORTIONS OF SAID MEDIUM CORRESPONDING TO SAID IMAGE PATTERN OF ACTINIC LIGHT AND THEN APPLYING TO AT LEAST REVERSIBLY ACTIVATED PORTIONS OF SAID MEDIUM A PHYSICAL DEVELOPER COMPRISING A SOLUTION OF METAL IONS AND A REDUCING AGENT FOR SAID METAL IONS WHICH FORMS METAL IMAGES SOLELY ON CONTACT WITH AT LEAST ACTIVATED PORTIONS OF SAID DATA STORAGE MEDIUM, THE IMPROVEMENT WHEREIN THE TITANIUM DIOXIDE HAS AN AVERAGE PARTICLE SIZE OF ABOUT 25 MILLIMICRONS.

Claim 17

Improvement as in claim 12 wherein said metal ions are silver ions.