Minnesota Mining and Manufacturing Company

David C Weigel

Kumars Sakizadeh

Roger A Mader

Tran V Thien

Stephen S Poon

Richard C Cotner

Duncan M Grieve

Kim Marie Vogel

Takuzo Ishida

Louis M Leichter

Oanh V Pham

David A Morgan

Leon W Anders

Kristen A Hoff

A process is described for providing a conductive metal circuit using a coherent radiation source. The circuit pattern is directly written onto a laser addressable element having a supercooling material layer. A conductive metal toner is then applied to the light struck areas and fired in a furnace to provide a conductive metal circuit.

Laser write process for making a conductive metal circuit

A photothermographic composite structure for use in a solvent-free dye thermal positive imaging diffusion-transfer process comprising:

Positive imaging diffusion-transfer dry silver system using formazan dye

Thermal recording material containing a suitable substrate coated with an image forming layer. The image forming layer contains a thermally reducible source of silver, a 3-indazolinone or urea compound; a polymeric binder; and optionally, an auxiliary reducing agent and toner. Preferably, an anti-stick layer is coated on top of the imaging layer. The 3-indazolinone and urea compounds have been found to enhance the thermal image forming capability of thermal recording material.

Thermal development accelerators for thermographic materials

Positive imaging diffusion - transfer dry silver system

Certain fluoran dyes have been found to be effective reducing agents for silver ion in dry silver constructions. The fluoran dyes have the following structure: ##STR1## wherein: R.sup.1 represents methyl or n-butyl;

Dry silver systems with fluoran leuco dyes

Photothermographic dry silver emulsions containing a benzylidene lenco dye and a development accelerator provide a high density yellow image upon exposure to actinic radiation and thermal developing at a relatively low temperature and for a short period of time.

Color photothermographic materials with development accelerator

Color photothermographic elements

A photothermographic element comprising a support bearing a photothermographic medium, the medium comprising a light sensitive silver halide in reactive association with a silver salt of an organic acid and a color generating reducing agent which is a leuco compound which is oxidisable by silver ions into a colored dye of the general formula: ##STR1## in which: n=0, 1 or 2,

Alkyl ketazine dyes are stabilized by the presence of poly(vinyl chloride) and/or poly(vinylidene chloride) binders in photothermographic emulsions.

Stabilization of ketazine dyes

The use of phenazine, phenoxazine and phenothiazine color forming developers in photothermographic dry silver emulsions provides a stable imaging system under both light and dark storage.

Photohermographic emulsions having stable color forming developers

Certain effective leuco dyes for silver halide/silver salt/reducing agent photothermographic color imaging materials tend to bleach in the final image. The presently disclosed system of a syringaldazine and a stabilizing binder resin is more stable.

Photothermographic stabilizers for syringaldazine leuco dyes

Certain effective toning systems for silver halide/silver salt/reducing agent photothermographic imaging materials tend to bleach the final image. The presently disclosed toning system of phthalazine and an active-hydrogen containing heterocyclic compound is more stable than some previous toners.

Photothermographic toners

Indicator material for monitoring personal exposure to hazardous substances in ambient air comprising a pigment material, a binder and a sensitizer coated upon a transparent support member as a porous coating which permits gaseous diffusion throughout the coating is disclosed. Detection or monitoring is effected when the indicator material undergoes a visually observable reaction with hazardous material in the atmosphere at room temperature.

Growing community of inventors

White Bear Lake, MN, United States of America

David C Weigel