Synthetic polymeric silver halide peptizer

Claim 2

A photosensitive silver halide emulsion wherein the silver halide grains have absorbed on their surface a substantially continuous layer of an emulsion peptizer consisting essentially of a water soluble film-forming polymeric silver halide grain-growing protective colloid having in its structure at least about one mole percent repeating units of the formula ##STR5## wherein R 1 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group, or halogen; R 2 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group, a halogen or cyano group; M is --CH 2 Z or --CHY 2 where Z is --CX 3 , --(CF 2 ) r CF 3 or --(CF 2 ) s H where X is --Br, --Cl or --F, r is 1-8 and s is 1-9; and Y is --CH 2 X or --CX 3 , and at least one of R 1 , R 2 , or M comprises a halogen.

Claim 3

The product as defined in claim 1 wherein said polymeric peptizer comprises a copolymer of a first monomer of the formula: ##STR6## and a second ethylenically unsaturated monomer.

Claim 4

The product as defined in claim 2 wherein said first monomer is 2,2,2-trifluoroethyl acrylate.

Claim 5

The product as defined in claim 2 wherein said first monomer is 2,2,2-trifluoroethyl methacrylate.

Claim 6

The product as defined in claim 2 wherein said first monomer is 1,3-dichloroisopropyl methacrylate.

Claim 7

The product as defined in claim 2 wherein said first monomer is 2,2,3,3,3-pentafluoroprop-1-yl acrylate.

Claim 8

The product as defined in claim 2 wherein said first monomer is 1,1,1,3,3,3-hexafluoroisopropyl acrylate.

Claim 9

The product as defined in claim 2 wherein said first monomer is 1,1,1,3,3,3-hexafluoroisopropyl methacrylate.

Claim 10

The product as defined in claim 2 wherein said first monomer is 2,2,3,3,4,4,5,5-octafluoro-n-pentyl methacrylate.

Claim 11

The product as defined in claim 2 wherein said first monomer is 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-n-octyl acrylate.

Claim 12

The product as defined in claim 2 wherein said second monomer is acrylamide.

Claim 13

The product as defined in claim 1 which includes a bodying polymer.

Claim 14

The product as defined in claim 12 wherein said bodying polymer is polyvinyl alcohol.

Claim 15

A process for preparing a photosensitive silver halide emulsion comprising reacting a water-soluble silver salt with a water-soluble halide salt in an aqueous solution containing a silver halide peptizer; said peptizer consisting essentially of a water-soluble film-forming polymeric silver halide grain-growing protective colloid having in its structure at least about one mole percent repeating units of the formula: ##STR7## wherein R 1 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group or a halogen; R 2 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group, a halogen or cyano group; M is --CH 2 Z or --CHY 2 where Z is --CX 3 , --(CF 2 ) r CF 3 or --(CF 2 ) s H where X is --Br, --Cl or --F, r is 1-8 and s is 1-9; and Y is --CH 2 X or --CX 3 , and at least one of R 1 , R 2 or M comprises a halogen.

Claim 16

A process for preparing a photosensitive silver halide emulsion comprising reacting a water-soluble silver salt with a water-soluble halide salt in an aqueous solution containing a silver halide peptizer; said peptizer consisting essentially of a water-soluble film-forming polymeric silver halide grain-growing protective colloid having in its structure at least about one mole percent repeating units of the formula: ##STR7## wherein R 1 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group or a halogen; R 2 is hydrogen, a lower alkyl group comprising a 1-4 carbon atom group, a halogen or cyano group; M is --CH 2 Z or --CHY 2 where Z is --CX 3 , --(CF 2 ) r CF 3 or --(CF 2 ) s H where X is --Br, --Cl or --F, r is 1-8 and s is 1-9; and Y is --CH 2 X or --CX 3 , and at least one of R 1 , R 2 or M comprises a halogen.

Claim 17

The process as defined in claim 14 wherein said polymer comprises a copolymer of a first monomer of the formula: ##STR8## and a second ethylenically unsaturated monomer.

Claim 18

The process as defined in claim 15 wherein said first monomer is 2,2,2-trifluoroethyl acrylate.

Claim 19

The process as defined in claim 15 wherein said first monomer is 2,2,2-trifluoroethyl methacrylate.

Claim 20

The process as defined in claim 15 wherein said first monomer is 1,3-dichloroisopropyl methacrylate.

Claim 21

The process as defined in claim 15 wherein said first monomer is 2,2,3,3,3-pentafluoroprop-1-yl acrylate.

Claim 22

The process as defined in claim 15 wherein said first monomer is 1,1,1,3,3,3-hexafluoroisopropyl acrylate.

Claim 23

The process as defined in claim 15 wherein said first monomer is 1,1,1,3,3,3-hexafluoroisopropyl methacrylate.

Claim 24

The process as defined in claim 15 wherein said first monomer is 2,2,3,3,4,4,5,5-octafluoro-n-pentyl methacrylate.

Claim 25

The process as defined in claim 15 wherein said first monomer is 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-n-octyl acrylate.

Claim 26

The process as defined in claim 15 wherein said second monomer is acrylamide.

Claim 27

The process as defined in claim 14 wherein said aqueous solution includes a bodying polymer.

Claim 28

The process as defined in claim 25 wherein said bodying polymer is polyvinyl alcohol.

Claim 29

The process as defined in claim 14 which further comprises: precipitating silver halide from said emulsion; removing soluble by-products from said silver halide by a washing procedure; and redispersing said silver halide in a bodying polymer.

Claim 30

The process as defined in claim 27 wherein said bodying polymer is gelatin.