Eastman-kodak Company

Gerald W Klein

Michel Frantz Molaire

Wayne A Bowman

John M Noonan

John E Keevert

Shane Crawford Weber

Robert C McConkey

Robert A Snow

Roger A Weiss

Dennis R Zander

Richard C Sutton

Kenneth Joseph Reed

Ramesh Jagannathan

Roy Eugene Snoke

Roy King

Certain synthetically prepared biopolymers are useful as peptizers in the preparation of photographic silver halide emulsions and elements. Such materials can be used as either nucleation or growth peptizers in place of common peptizing colloids, such as gelatins. The biopolymers can be prepared using recombinant or chemical synthetic methods and designed to have a particular affinity (either high or low) for silver ions. Thus, they can be used to control silver halide grain morphology in the emulsions.

Silver halide emulsions, elements and methods of making same using

Improved sensitivity and reduced minimum density are provided by an emulsion in which high bromide tabular grains exhibit an average thickness of less than 0.07 .mu.m and have latent image forming reduction chemical sensitization sites and adsorbed spectral sensitizing dye on their surfaces. The tabular grains contain a dopant capable of forming shallow electron trapping sites, and the spectral sensitizing dye exhibits an oxidation potential more positive than 1.2 volts. A photographic element is disclosed which locates the emulsion in a layer overlying a minus blue recording emulsion layer. Exceptionally sharp images are formed in the minus blue recording emulsion layer when in the overlying emulsion layer greater than 97 percent of the total projected area of the silver halide grains having an equivalent circular diameter of at least 0.2 .mu.m is accounted for by tabular grains having an average equivalent circular diameter of at least 0.7 .mu.m.

Emulsion and photographic element

A process for preparing a thin tabular grain silver halide emulsion comprised of silver halide grains which have a halide content of at least 50 mole percent bromide, wherein tabular grains of less than 0.15 micrometers in thickness and having an aspect ratio of greater than 8 account for greater than 50 percent of the total grain projected area, comprises the steps of nucleating the silver halide grains with a gelatino-peptizer or with the use of certain synthetic polymers that serve as effective nucleation peptizers and then growing the silver halide grains with the use of either a gelatino-peptizer or certain synthetic polymers that serve as effective growth peptizers.

Preparation of thin tabular grain silver halide emulsions using

A flexible and nonbrittle negative-working photoresist composition comprises a polymeric binder, a photoinitiator composition, and a polymerizable cyclohexyleneoxyalkyl acrylate monomer characterized by the structural formula: ##STR1## wherein R is H or CH.sub.3,

Photoresist composition comprising cyclohexyleneoxyalkyl acrylates

A laminate, adapted for manufacturing frames of metal beam leads that are bonded to integrated circuit chips, comprises

Luminate for the formation of beam leads for IC chip bonding

A method for making an electronic component, for example, a motor coil. The method comprises the steps of forming a plurality of conductive layers and interconnecting the layers to provide an electrically conductive path between the layers. In order to form interconnections between the layers which have a low electrical resistance and which can be formed in a high-speed automated process, a conductive paste is applied to one of the conductive layers and the layers are superposed to form the interconnections.

Method of making an electronic component

Photographic elements and diffusion transfer assemblages are described which contain a novel polymeric mordant comprising recurring units having the formula ##STR1## wherein A represents recurring units derived from an .alpha.,.beta.-ethylenically unsaturated monomer;

Polymeric mordants

Photographic element and diffusion transfer assemblages are described which contain a novel mordant comprising recurring units having the formula ##STR1## wherein A represents recurring units derived from an .alpha.,.beta.-ethylenically unsaturated monomer;

Photographic elements, diffusion transfer assemblages and processes are described wherein a dye image-receiving layer comprising a poly(vinylimidazole) mordant is employed in a nonmordanting, water-permeable polymeric vehicle. The polymeric vehicle comprises recurring units derived from a hydroxyalkyl acrylate ester, and/or an N-hydroxyalkylacrylamide, and/or an N-alkylacrylamide. Image sharpness is thereby improved, especially under conditions of high temperature and humidity.

Polymeric vehicle for dye image-receiving layer containing a

Nucleic acids and unwanted proteins are removed from microbial enzyme extracts by precipitation with water-soluble, cationic polymers comprised of monomers having the structure ##STR1## wherein R.sub.1 is a hydrogen atom, a lower alkyl group, or the equivalent and R.sub.2 is a nitrogen containing group capable of carrying a positive electrical charge when the polymer is dissolved in an aqueous solution.

Growing community of inventors

Pittsford, NY, United States of America

Gerald W Klein