Color diffusion transfer films and processes with polymer encapsulated reflecting agents

Claim 2

A film unit as defined in claim 1 wherein said means comprises a container of said aqueous alkaline processing composition and said reflecting agent comprises a pigment.

Claim 3

In a photographic product comprising a photosensitive component including at least one light-sensitive silver halide layer having a dye image-providing material associated therewith; a positive component including a dyeable stratum and a quantity of an aqueous alkaline processing composition having a reflecting agent dispersed therein adapted to be applied as a layer between said positive and negative components to impart to said dyeable stratum a color transfer image viewable without separation of said components due to the ability of said applied reflecting agent to mask effectively the negative component and to provide the background for viewing by reflected light the transfer image imparted to said dyeable stratum; the improvement wherein said reflecting agent is encapsulated within a polymeric wall.

Claim 4

A product as defined in claim 4 wherein said reflecting agent is a white pigment.

Claim 5

A product as defined in claim 5 wherein said polymeric wall is characterized as being a coating encapsulating said pigment and having strands of interconnecting tissues bridging a plurality of the thus encapsulated pigment particles.

Claim 6

A product as defined in claim 6 wherein said polymer is an acrylic polymer.

Claim 7

A product as defined in claim 6 wherein said pigment iS titanium dioxide.

Claim 8

A product as defined in claim 4 wherein said processing composition includes at least one opacifying agent.

Claim 9

A product as defined in claim 9 in which the opacifying agent is an optical filter agent exhibiting major spectral absorption at the pH of said alkaline processing composition and which is substantially transparent at the lower pH obtained after transfer image formation.

Claim 10

In a photographic product comprising a transparent support; a dyeable stratum; a blue-sensitive silver halide layer having a yellow dye image-providing material associated therewith; a green-sensitive silver halide layer having a magenta dye image-providing material associated therewith; a red-sensitive silver halide layer having a cyan dye image-providing material associated therewith; and a quantity of an aqueous alkaline processing composition including a dispersion of a white reflecting agent positioned outside the exposure plane of said product and being adapted to be applied, following exposure, between said dyeable stratum and said blue-sensitive silver halide layer; the improvement wherein said reflecting agent is encapsulated within a polymeric wall.

Claim 11

A product as defined in claim 11 wherein said polymeric wall is characterized as being a coating encapsulating said agent and having strands of interconnecting tissues bridging a plurality of the thus encapsulated agent particles.

Claim 12

A product as defined in claim 11 wherein said polymer is an acrylic polymer.

Claim 13

A product as defined in claim 13 wherein said reflecting agent is titanium dioxide.

Claim 14

A product as defined in claim 14 wherein the amount of polymeric material encapsulating said titanium dioxide is at least 2 percent by weight of said titanium dioxide.

Claim 15

In a photographic film unit adapted to be processed by passing the unit between a pair of juxtaposed pressure-applying members and which comprises, in combination: an opaque support; a layer of a cyan dye image-providing material; a red-sensitive silver halide emulsion layer; a layer of a magenta dye image-providing material; a green-sensitive silver halide emulsion layer; a layer of a yellow dye image-providing material; a blue-sensitive silver halide emulsion layer; a dyeable stratum; a neutralizing layer for lowering the environmental pH from a first pH of an alkaline processing composition employed to develop said film unit to a second pH; and a transparent support, each of said dye image-providing materials being adapted to form, as a function of development, an imagewise distribution of dye which is soluble and diffusible in alkali at said first pH but which is substantially nondiffusible at said second pH; a rupturable container retaining an alkaline aqueous processing composition possessing the first pH and having dispersed therein titanium dioxide and at least one optical filter agent which is substantially non-diffusible from the processing composition and possessing a pKa below the first pH and above the second pH and the titanium dioxide and filter agent are present in a quantity sufficient, upon application of the alkaline processing composition as a layer between the dyeable stratum and the blue-sensitive emulsion layer, to provide sufficient opacity to protect the silver halide emulsion layers from fogging by actinic light incident on the thus applied layer of processing composition at said first pH, whereby said applied layer of processing fluid cooperates with said opaque support to provide a lighttight envelope for said emulsion layers so that said film unit can be developed in the light, said titanium dioxide being present in an amount sufficient to mask effectively said silver halide emulsion layers and any remaining dye image-providing material following development of said film unit and to provide a white background for viewing through said transparent support a color transfer image imparted to said dyeable stratum bY diffusion thereto of said imagewise distribution of soluble and diffusible dye formed as a function of development, said rupturable container being positioned and extending transverse an edge of said film unit to effect unidirectional discharge of its contents intermediate the dyeable stratum and the blue-sensitive emulsion layer; the improvement wherein the titanium dioxide is encapsulated within a polymeric wall to provide greater resistance against settling or phase separation of said dispersed titanium dioxide from the aqueous alkaline medium in said rupturable container.

Claim 16

A film unit as defined in claim 16 wherein said polymeric wall is characterized as being a coating encapsulating said pigment and having strands of interconnecting tissues bridging a plurality of the thus encapsulated pigment particles.

Claim 17

A film unit as defined in claim 16 wherein said polymer is an acrylic polymer.

Claim 18

A film unit as defined in claim 16 wherein the amount of polymer encapsulating said titanium dioxide is from about 2 to about 25 percent by weight of said encapsulated titanium dioxide.

Claim 19

In a photographic process wherein a film unit including a negative component comprising at least one light-sensitive silver halide layer having a dye image-providing material associated therewith and a positive component including a dyeable stratum is exposed to form a developable image and the thus exposed film unit is then developed by applying an aqueous alkaline processing composition in a layer between said negative and positive components to develop said image and to form, as a function of said development, a color diffusion transfer image viewable, without separation of said components, as a color reflection print; the improvement wherein the composition employed to develop said image comprises an aqueous alkaline solution having dispersed substantially uniformly therein a pigment encapsulated within a polymeric wall.

Claim 20

In a photographic process wherein a film unit including a negative component comprising at least one light-sensitive silver halide layer having a dye image-providing material associated therewith and a positive component including a dyeable stratum is exposed to form a developable image and the thus exposed film unit is then developed by applying an aqueous alkaline processing composition in a layer between said negative and positive components to develop said image and to form, as a function of said development, a color diffusion transfer image viewable, without separation of said components, as a color reflection print; the improvement wherein the composition employed to develop said image comprises an aqueous alkaline solution having dispersed substantially uniformly therein a titanium dioxide encapsulated within a polymeric wall and an optical filtering agent exhibiting major spectral absorption at a pH of said alkaline solution but which is substantially transparent at a lower pH.