US5750323A — Solid particle dispersions for imaging elements

Claim 1

Independent Claim 146 words

A process for preparing a solid particle aqueous dispersion of a first compound useful in imaging elements, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, and said first compound is other than a phthalocyanine pigment said process comprising: (a) adding a structurally similar distinct additive to said first compound, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent if the first compound, and (b) dispersing said first compound and additive together in an aqueous medium.

Claim 2

Dependent Claim 146 words

A process for preparing a solid particle aqueous dispersion of a first compound useful in imaging elements, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, and said first compound is other than a phthalocyanine pigment said process comprising: (a) adding a structurally similar distinct additive to said first compound, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent if the first compound, and (b) dispersing said first compound and additive together in an aqueous medium.

Claim 3

Dependent Claim 23 words

The process of claim 1, wherein said first compound and additive are dispersed by milling an aqueous slurry of said compound and additive.

Claim 4

Dependent Claim 21 words

The process of claim 1, wherein said first compound and additive are dispersed by precipitating said compound and additive from solution.

Claim 5

Dependent Claim 29 words

The process according to claim 1, wherein the structurally similar additive compound has a total molecular mass of at least 12 Daltons greater than that of the first compound.

Claim 6

Dependent Claim 24 words

The process according to claim 1, in which only one or two substituents on said first compound are replaced with higher molecular weight substituents.

Claim 7

Dependent Claim 33 words

The process according to claim 5, in which the additive comprises a structure derived from the structure of said first compound by replacement with a higher molecular weight substituent at a single site.

Claim 8

Dependent Claim 27 words

The process according to claim 6, in which the additive substituent has a molecular mass of from 12 to 200 Daltons greater than the replaced compound substituent.

Claim 9

Dependent Claim 32 words

The process according to claim 5, in which the additive substituent is alkyl, aryl, or alkyl-aryl, or an alkyl, aryl, or alkyl-aryl substituent containing a single amide, alkyl-ester, alkyl-amide, or dialkyl-amide group.

Claim 10

Dependent Claim 21 words

The process of claim 1 wherein said first compound is a compound useful in photographic or thermal transfer printing imaging elements.

Claim 11

Dependent Claim 38 words

The process of claim 9, wherein said first compound is selected from the group consisting of couplers, sensitizing dyes, filter dyes, thermal transfer dyes, antioxidants, oxidized developer scavengers, anti-stain agents, anti-fade agents, silver halide developing agents, and antifoggants.

Claim 12

Dependent Claim 18 words

The process of claim 9, wherein said first compound is a filter dye or a thermal transfer dye.

Claim 13

Dependent Claim 16 words

The process of claim 9, wherein said first compound is an organic non-metal complex filter dye.

Claim 14

Dependent Claim 169 words

A process for preparing a solid particle aqueous dispersion of a first compound useful in imaging elements, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, comprising: (a) adding a structurally similar distinct additive to said first compound, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound. and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, and (b) dispersing said first compound and additive together in an aqueous medium, wherein said first compound is a photographic filter dye which is substantially aqueous insoluble at pH of less than 7 and readily soluble or decolorizable in photographic processing solutions at pH of 8 or above.

Claim 15

Dependent Claim 169 words

A process for preparing a solid particle aqueous dispersion of a first compound useful in imaging elements, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, comprising: (a) adding a structurally similar distinct additive to said first compound, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound. and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, and (b) dispersing said first compound and additive together in an aqueous medium, wherein said first compound is a photographic filter dye which is substantially aqueous insoluble at pH of less than 7 and readily soluble or decolorizable in photographic processing solutions at pH of 8 or above.

Claim 16

Dependent Claim 50 words

The process of claim 13, wherein the filter dye is of formula I: D-(X).sub.n (I) where D represents a residue of a compound having a chromophoric group, X represents a group having an ionizable proton bonded to D either directly or through a bivalent bonding group, and n is 1-7.

Claim 17

Dependent Claim 68 words

The process of claim 14, wherein the residue of a compound having a chromophoric group is an oxonol dye, merocyanine dye, cyanine dye, arylidene dye, azomethine dye, triphenylmethane dye, azo dye, or anthraquinone dye, and the group having an ionizable proton is a carboxyl group, a sulfonamido group, a sulfamoyl group, a sulfonylcarbamoyl group, a carbonylsulfamoyl group, a hydroxy group, or an enol group of a oxonol dye.

Claim 18

Dependent Claim 14 words

The process of claim 9, wherein said first compound is a thermal transfer dye.

Claim 19

Dependent Claim 36 words

The process of claim 1, wherein the structurally similar distinct additive and first compound each comprise an identical structural section thereof which makes up at least 90% of the total molecular weight of the first compound.

Claim 20

Dependent Claim 36 words

The process of claim 1, wherein the structurally similar distinct additive and first compound each comprise an identical structural section thereof which makes up at least 99% of the total molecular weight of the first compound.

Claim 21

Dependent Claim 24 words

The process of claim 1, wherein the additive is present in the dispersion at from 0.05 to 50 wt % of the first compound.

Claim 22

Dependent Claim 23 words

The process of claim 19, wherein the additive is present in the dispersion at 20 wt % of the first compound or less.

Claim 23

Dependent Claim 23 words

The process of claim 1, wherein the additive is present in the dispersion at 0.5 wt % of the first compound or greater.

Claim 24

Dependent Claim 145 words

A stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, and said first compound is other than a phthalocyanine pigment.

Claim 25

Dependent Claim 145 words

A stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, and said first compound is other than a phthalocyanine pigment.

Claim 26

Dependent Claim 20 words

A dispersion of claim 22, wherein the solid particle dispersion has an average particle size of less than one micron.

Claim 27

Dependent Claim 49 words

A dispersion of claim 22, wherein the first compound is a compound useful in photographic or thermal transfer printing imaging elements selected from the group consisting of couplers, sensitizing dyes, filter dyes, thermal transfer dyes, antioxidants, oxidized developer scavengers, anti-stain agents, anti-fade agents, silver halide developing agents, and antifoggants.

Claim 28

Dependent Claim 16 words

A dispersion of claim 24, wherein the first compound is an organic non-metal complex filter dye.

Claim 29

Dependent Claim 170 words

A stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, wherein the first compound is a photographic filter dye which is substantially aqueous insoluble at pH of less than 7 and readily soluble or decolorizable in photographic processing solutions at pH of 8 or above.

Claim 30

Dependent Claim 170 words

A stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound, and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound, wherein the first compound is a photographic filter dye which is substantially aqueous insoluble at pH of less than 7 and readily soluble or decolorizable in photographic processing solutions at pH of 8 or above.

Claim 31

Dependent Claim 50 words

A dispersion of claim 26, wherein the filter dye is of formula I: D-(X).sub.n (I) where D represents a residue of a compound having a chromophoric group, X represents a group having an ionizable proton bonded to D either directly or through a bivalent bonding group, and n is 1-7.

Claim 32

Dependent Claim 68 words

A dispersion of claim 27, wherein the residue of a compound having a chromophoric group is an oxonol dye, merocyanine dye, cyanine dye, arylidene dye, azomethine dye, triphenylmethane dye, azo dye, or anthraquinone dye, and the group having an ionizable proton is a carboxyl group, a sulfonamido group, a sulfamoyl group, a sulfonylcarbamoyl group, a carbonylsulfamoyl group, a hydroxy group, or an enol group of a oxonol dye.

Claim 33

Dependent Claim 14 words

A dispersion of claim 24, wherein the first compound is a thermal transfer dye.

Claim 34

Dependent Claim 170 words

A photographic element comprising a support bearing at least one silver halide emulsion layer, and at least one layer, which may be the same as or different from the silver halide emulsion layer, which comprises a stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound. and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound.

Claim 35

Dependent Claim 170 words

A photographic element comprising a support bearing at least one silver halide emulsion layer, and at least one layer, which may be the same as or different from the silver halide emulsion layer, which comprises a stable solid particle dispersion comprising solid particles of a first compound useful in imaging elements and from 0.05 to 50 wt %, based on the weight of the first compound, of a structurally similar distinct additive dispersed together in an aqueous medium, such additive and first compound each comprising an identical structural section thereof which makes up at least 75% of the total molecular weight of the first compound. and the additive having at least one substituent bonded to the identical structural section which has a molecular weight higher than the corresponding substituent of the first compound, where dispersed solid particles of said first compound are subject to undesirable particle growth in aqueous mediums when said first compound is dispersed in the absence of any other distinct compound structurally similar to said first compound.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-05-11	2001-11-10	2002-05-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-05-11	2005-11-10	2006-05-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-05-11	2009-11-10	2010-05-12	$7700.00	Window Closed / Lapsed

Solid particle dispersions for imaging elements

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