Ciba-geigy Ag

Other

Ciba-geigy Corporation

Stephen R Postle

Patrick D Thomas

William E Long

Samuel B Kingston

David P Gregory

Norman A Smith

Brian R Whitear

Peter J Elton

Alexander Psaila

Terence C Webb

James Doyle

Kenneth M McCombe

Martin C Grossel

Janice Butcher

Roy P Barber

Bernard J Dean

An assembly for monitoring ionising radiation which comprises coated on a base a binder layer containing a polychlorinated hydrocarbon and a color former. The assembly can be used to monitor levels of radiation of from 0.1 MRads to 10.0 MRads.

Assembly for monitoring ionising radiation

A diagnostic strip which comprises a base having coated thereon a dried layer which has been formed by coating onto the base an aqueous solution which comprises from 0.5 to 2.0% by weight of agarose and from 0.5 to 3.0% by weight of non-cross linked polyacrylamide or polyvinyl alcohol or a mixture of these polymers, the dried layer being 0.1 to 100 .mu.m thick and comprising 10 to 50% by weight solids.

Diagnostic strip

A method of preparing a diagnostic strip coated with agarose which comprises preparing a roll of web material so that an aqueous silver halide emulsion can adhere thereto on one side thereof, but which does not have a gelatin or any other proteinaceous layer on the prepared side then coating on the prepared side of the web by a continuous web coating method a layer of an aqueous agarose solution at a temperature of at least 40.degree. C., drying the coated agarose layer to provide a dried layer thickness of from 0.1 to 100 .mu.m which is dry to touch, but which comprises 10 to 50% w/w solids and cutting the coated web into strips of the required size.

Diagnostic strips

A method of monitoring if a stored product has exceeded a predetermined temperature using an assembly, which comprises coated onto a carrier a gelatin layer containing an acidic reactant, color former and an encapsulated non-aqueous solvent.

Method of monitoring temperature

Compounds of the formula ##STR1## where Y is a tertiary group, X is hydrogen or a leaving group, and Q is hydrogen, amidino, alkyl or aryl, there being present in Y or Q a ballasting group which comprises 10 to 30 carbon atoms, exhibit a high secondary absorption in the blue region of the visible spectrum and are useful couplers in chromogenic monochrome negative material.

Pyrazolone compounds and a process for their manufacture

A photochromic assembly is produced by coating onto a self-supporting flexible plastics material a polymer latex comprising from 10 to 40% by weight to the total solids of the latex photochromic glass beads from 0.05 .mu.m to 50 .mu.m in size.

Photochromic assembly comprising photochromic glass beads in polymer

Compounds of the formula ##STR1## wherein L is a direct bond or consists of a chain of carbon atoms or of a divalent ring system, R.sub.1 to R.sub.4 are hydrogen or alkyl, R.sub.5 or R.sub.6 are hydrogen, alkyl or aryl, or R.sub.5 together with R.sub.6 complete a ring system, and R.sub.7 is hydrogen or a group of the formula ##STR2## wherein L, R.sub.5 and R.sub.6 are as defined. These compounds are useful developing agents for activation processing.

Protected developing agents

A photochromic assembly is produced by coating onto a self-supporting flexible plastics material a polymer latex comprising from 10 to 40% by weight of the total solids of the latex photochromic glass beads from 0.05 .mu.m to 50 .mu.m in size.

Photochromic assembly and manufacture of this assembly

A transparent sheet material which is suitable for projection on overhead projectors comprises coated onto a support a binder layer containing discrete particles of an organic polymer which has substantially the same refractive index as the binder, the polymer comprising from 0.5 to 30% by weight of the binder. The coating gives a good key for typewritten characters produced by carbon ribbon or ink ribbon typewriters, for writing with e.g. ball-point pen, pencil, water or solvent based ink pens, Indian ink and inked rubber stamps.

Sheet material

Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrogen or alkyl, X represents the atoms to complete an aromatic heterocyclic ring system and Y is hydrogen or has the meaning assigned to X, are readily cleaved in alkaline solutions to release a hydroquinone derivative. The compounds can be incorporated into photographic materials used for activation processing.

Hydroquinone derivatives and their use in photographic materials

Photographic material which comprises in at least one silver halide emulsion layer or a layer or layers adjacent thereto at least one substituted hydroquinone compound of the formula ##STR1## where R is hydrogen or optionally substituted alkyl, aryl or a heterocyclic group, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each hydrogen, halogen or optionally substituted alkyl,

Photographic material

Photochromic paint comprising a latex of an acrylate and/or a methacrylate polymer, the polymer particles of which constitutes 30 to 50% by weight of the latex and which has been prepared using a copolymerizable surfactant, there being dispersed in the latex photochromic glass beads of from 0.05 to 1.00 .mu.m in size and which comprises from 10 to 30% by weight of the latex, the total solids content of the latex being from 40 to 60% by weight. The paint may be coated on to any surface which will accept a water-based paint.

Photochromic paint

Substituted hydroquinone compounds of the formula ##STR1## wherein R.sub.1 to R.sub.4 are hydrogen or alkyl and Z is an aromatic ring or a group of the formula --X--Y--X--, wherein X is an aromatic ring and Y is an electron withdrawing group, are incorporated as developers into photographic materials. These materials are suitable for activation processings.

Process for the production of a photographic black dye image which comprises

Process for the production of a photographic image

Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrogen or alkyl, X represents the atoms to complete an aromatic heterocyclic ring system and Y is hydrogen or the group ##STR2## where X is defined as above, are readily cleaved in alkaline solutions to release a hydroquinone derivative. The compounds can be incorporated into photographic materials used for activation processing.

Growing community of inventors

Brentwood, United Kingdom

Stephen R Postle