Imaging systems employing photosensitive microcapsules containing 4-(4'-aminophenyl)-pyridine compounds

• US 4,600,678 A
• Filed: 08/03/1984
• Issued: 07/15/1986
• Est. Priority Date: 08/03/1984
• Status: Expired due to Fees

• Current Assignee: MEAD Corporation (Meadwestvaco Corporation)
• Original Assignee: MEAD Corporation (Meadwestvaco Corporation)
• Inventors: Adair, Paul C., Burkholder, Amy L.
• Primary Examiner(s): Kittle, John
• Assistant Examiner(s): SHAH, MUKUND JETHALAL
• Application Number:
  US06/637,258
• Time in Patent Office: 711 Days
• Field of Search: 430/138, 430/338, 427/213.31, 428/402.2, 428/402.21, 428/404.24, 252/600, 282/27.5
• US Class Current: 430/138
• CPC Class Codes: G03F 7/002 using materials containing microcapsules; Preparing or processing such materials, e.g. by pressure; Devices or apparatus specially designed therefor
• CPC Class Codes: Y10T 428/2984 Microcapsule with fluid core [includes liposome]
• CPC Class Codes: Y10T 428/2985 Solid-walled microcapsule from synthetic polymer
• CPC Class Codes: Y10T 428/2989 Microcapsule with solid core [includes liposome]

Abstract

Imaging systems employing photosensitive microcapsules having improved film speed are disclosed wherein the microcapsules contain a 4-(4'"'"'-aminophenyl)-pyridine compound in the internal phase as a color former.

Claims

1. An imaging sheet comprising a support having on a surface thereof a layer containing photosensitive microcapsules, said microcapsules including in the internal phase thereof a free radical addition polymerizable material, a photoinitiator, and a color former, wherein said photoinitiator is capable of generating free radicals upon exposure to actinic radiation via hydrogen abstraction and said color former is a 4-(4'"'"'-aminophenyl)-pyridine compound which enhances the film speed of said imaging sheet.

2. The imaging sheet of claim 1 wherein said microcapsule has a discrete capsule wall.

3. The imaging sheet of claim 2 wherein said free radical addition polymerizable material is an ethylenically unsaturated compound.

4. The imaging sheet of claim 3 wherein said photoinitiator is an aryl ketone.

5. The imaging sheet of claim 4 wherein said 4-(4'"'"'-aminophenyl)-pyridine compound is represented by the formula (I):

##STR2## in which R¹ and R² are the same or different and selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, phenyl, p-methoxyphenyl, p-ethoxyphenyl, γ

-methoxypropyl and p-chlorophenyl,

R³ is selected from the group consisting of hydrogen, methyl, ethyl, propyl, and butyl;

R⁴ is selected from the group consisting of methyl, ethyl, propyl, butyl, β

-chloroethyl, β

cyanoethyl, phenyl, benzyl, p-methoxyphenyl and p-ethoxyphenyl, and

R⁵ and R⁶ are the same or different and selected from the group consisting of hydrogen, carbomethoxy, carboethoxy, carbopropoxy and carbobutoxy.

6. The imaging sheet of claim 5 wherein:

R¹ and R² are hydrogen or phenyl;

R³ and R⁴ are methyl, propyl or butyl; and

R⁵ and R⁶ are hydrogen.

7. The imaging sheet of claim 6 wherein said compound is 2,6-diphenyl-4-(4'"'"'-dimethylaminophenyl) pyridine.

8. The imaging sheet of claim 5 wherein said aryl ketone has λ

max greater than about 380 nm.