Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Rodney Riddle

Matthias Kuntz

John Patrick

Robert Hammond-Smith

Dietmar Raulin

David Coates

Sabine Schoen

Gerhard Pfaff

Reiner Vogt

Peter Schmitt

Dieter Heinz

Reiner Delp

Donald Gordon Graham

Wolf-Dietrich Weber

Michael Ukelis

Joachim Weitzel

Guy Gregory

Bernd Muller

Hans-Dieter Brueckner

Barry Edward Kinsman

Mathias Kuntz

Hubert Linne

Gunther Feldmann-Schlobohm

G Unther Feldmann-Schlobohm

Bernd M Uller

Anthony R Wilson

Allan Marshall

Peter Howarth

Tony Bleasdale

Siegfried Schmitzer

The invention relates to a method of preparing a birefringent marking by printing a polymerisable liquid crystal material onto at least one side of a substrate and polymerising the liquid crystal material, to a birefringent marking obtained by this method, and to the use of the birefringent marking for decorative, security, authentification and identification applications.

Birefringent marking

The invention relates to the use of a printable polymerisable liquid crystal material as printable system for the preparation of polymers and pigments, to printable polymerisable liquid crystal materials and pigments and polymers prepared thereof, and to the use of the printable materials, pigments and polymers in optical, electrooptical, semiconductor and electronic applications and as birefringent and optically variable markings for decorative, security, authentification or identification applications.

Printable liquid crystal material

The invention relates to liquid crystal flakes, to methods of their preparation and to their use as pigments for security or decorative applications or optical elements.

Flakes comprising non-chiral liquid crystal material

An anisotropic polymer film with improved alignments prepared by coating onto a substrate with a structured surface. The polymer films thereby obtained are useful in optical and electrooptical devices for decorative and security applications.

Method of preparing an anisotropic polymer film on a substrate with a structured surface

The invention relates to an optically variable marking comprising a semiopaque substrate with a first surface that is covered with an optically variable layer that is for example a liquid crystal polymer layer or a layer comprising pearlescent pigments, and a second surface that is partially covered with a metal layer in the shape of a pattern, to methods of its preparation and to its use for decorative or security applications.

Optically variable marking

A method for generating a 3-dimensional effect involves providing at least one first image layer of a chiral liquid crystal material, and at least one second image layer of a chiral liquid crystal material, wherein one of the first and second image layers reflects right-handed circularly polarised light and the other reflects left-handed circularly polarised light, is suitable creating a 3-dimensional image that can be used for decorative and security applications.

Method of generating a 3-dimensional effect

The invention relates to a birefringent marking comprising a liquid crystal material. The invention further relates to method of providing such a birefringent marking and to the use of the birefringent marking for decorative or security applications.

The invention relates to multilayer reflective films and pigments showing selective reflection of light wherein the reflection characteristics are dependent on the viewing angle, characterized in that they comprises at least one reflective layer, at least one circular polarizing layer and optionally at least one optical retardation layer. The invention further relates to the use of these multilayer reflective films and pigments in optical elements, as coatings or in lacquers, inks or paints for cosmetic, decorative or security applications, to inks and paints comprising one or more multilayer reflective pigments dispersed in a light transmissive binder, and to security markings or devices comprising one or more multilayer reflective films or pigments.

Multilayer reflective film or pigment with viewing angle dependent reflection characteristics

The present invention relates to rare earth metal sulfide or oxysulfide pigments and yttrium sulfide or oxysulfide pigments based on platelet-shaped substrates.

Sulfide and oxysulphide pigments

The invention relates to a spray pyrolytic process for the preparation of multi-element metal oxide powders useful as precursors of high temperature superconductor ceramics. Aerosols of aqueous solutions containing corresponding metal salts admixed in the required stoichiometric proportion are sprayed through an independently operated hydrogen/oxygen flame in such a way that a flame temperature of 800.degree.-1100.degree. C. is maintained to form said powders. Any contact of the aerosols and powders generated during the process with carbon or carbon-containing compounds or materials is strictly avoided.

Bi(Pb)SrCaCuO superconductors

Reaction spray process for preparing inclusion pigments by suspending the pigment to be encapsulated in an aqueous solution or suspension of a precursor of the inclusion material, spraying the suspension, with or without the addition of nitric acid and fuel, in a tubular reactor heated at from 850.degree. to 1100.degree. C., separating the inclusion pigment from the product stream and, if desired post-calcining the pigment at a temperature of at least 816.degree. C.

Process for the preparation of inclusion pigments

The invention relates to a spray pyrolyric process for the preparation of multi-element metal oxide powders useful as precursors of high temperature superconductor ceramics. Aerosols of aqueous solutions containing corresponding metal salts admixed in the required stoichiometric proportion are sprayed through an independently operated hydrogen/oxygen flame in such a way that a flame temperature of 800.degree.-1100.degree. C. is maintained to form said powders. Any contact of the aerosols and powders generated during the process with carbon or carbon-containing compounds or materials is strictly avoided.

Spray-pyrolysis process of preparing superconductor precursors

Disclosed is a process for the preparation of multi-element metal oxide, high temperature superconductor precursor powder comprising spraying a homogenous solution of a multi-element metal salt solution mixed in a stoichiometric ratio corresponding to the desired superconducting composition into a horizontal tube-like furnace being heated to a temperature of 800.degree.-1000.degree. C., transporting resulting sprayed mist along the main axis of the furnace tube by the aid of hot air and collecting resultant finely divided metal oxide powder by the aid of a filter, whereby the resultant mixed metal oxide powder is a precursor for the preparation of a high temperature superconducting ceramic.

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Dorset, United Kingdom

Rodney Riddle