Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gmbh

Merck Patent Gesellschaft

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Tamio Noguchi

Sabine Schoen

Christoph Schmidt

Yukitaka Watanabe

Takaji Watanabe

Masahiko Yazawa

Yumiko Waragai

Katsuhisa Nitta

Ralf Anselmann

Kaiman Shimizu

Fumiko Sasaki

Manuela Loch

Martin Knapp

Tamio Aikawa

Kazuhisa Iwasa

Tsuyoshi Miyashita

Kazhisa Iwasa

Magnetic pigments containing a transparent flaky homogeneously composed substrate having two parallel major surfaces and a coating containing maghemite, a process for the production of said pigments as well as their use.

Magnetic pigments comprising a flaky substrate and layer of maghemite

An iridescent multilayer pigment having at least two or more layers of metal oxides containing one or more metals selected from Ce, Sn, Ti, Fe, Zn and Zr which are coated onto the surface of thin platelet-like substrates. The inventive pigments show high brilliance and high chroma, in particular in cases in which thin platelet-like substrates having a fine average particle diameter are used. The pigment is useful in paints, printing inks, lacquers, plastics, dopants for laser marking, non-dusting pigment products, non-dusting pigment granules or cosmetics.

Iridescent pigment having high brilliance and high chroma

A body pigment with a good skin feel for cosmetics is provided which has an appropriate crumbling property and combines slipping property and adhesiveness without compromising oil absorption. The body pigment is comprised of a metal-containing compound and has a structure in which leaf-shaped flakes are combined and/or intersected.

Body pigment and process for preparing the same

Pigments of flake substrate coated with calcium carbonate wherein the surface of the flake substrate is coated with fine particles of calcium carbonate. The pigment may be manufactured by a method where calcium carbonate in fine particles is separated out and coated on the surface of the flaky substrate by the reaction of a calcium salt with a carbonate in a suspension of the flake substrate. It can be used as an extender particularly for cosmetics exhibiting appropriate adhesion to skin, low luster and excellent wrinkle-hiding effect, prevention of unpleasant feel due to perspiration, sebum absorbing property, etc.

Pigment in thin flakes coated with calcium carbonate and a method for manufacturing the same

Ultraviolet absorbent

A pigment in thin flakes where spherical silica particles having an average particle size of 20-400 nm are adhered on the surface of a flaky substrate having an average particle size of 0.5-10 &mgr;m and then the said spherical silica particle-adhered surface of the flaky substrate adhered with spherical silica is further coated with ultrafine particles of titanium dioxide.

Pigment in thin flakes and a method for manufacturing the same

The present invention is directed to the development of a highly safe high-chroma orange pearl pigment replacing a cadmium pigment, in which a flaky substrate has surfaces coated with spherical metal oxide particles containing iron oxide, or spherical metal oxide particles obtained by adding thereto a specific proportion of one or more oxides selected from among aluminum, calcium and magnesium oxides, and a process for manufacturing the same, and uses thereof.

High-chroma orange pearl pigment

An ultraviolet radiation shielding pigment having a high power of shielding of ultraviolet radiation, particularly UV-A, a low cohesive force, and excellent extensibility and adhesiveness as a pigment for cosmetics. A pigment for shielding an ultraviolet radiation which comprises a flaky powder having particle surfaces coated with particles of barium sulfate having an average diameter of 0.1 to 2.0 microns, and with needle crystal particles of zinc oxide having an average major-axis diameter of 0.05 to 1.5 microns, and a process for manufacturing it.

Pigment for shielding of ultraviolet radiation

Spherical SiO.sub.2 particles with a size of from 5 to 500 nm coated at individual points with TiO.sub.2, Fe.sub.2 O.sub.3 or ZrO.sub.2 particles with a size of less than 60 nm. The coated SiO.sub.2 particles can be aftercoated with silanes or further metal oxides. The products obtained are used for pigmenting paints, printing inks, plastics and coatings or as sunscreen agents.

Coated spherical SiO.sub.2 particles

Composite fine particles of metal oxides containing titanium dioxide which produce a remarkable ultraviolet screening effect over the entire region of spectrum. Each particle is composed of a core and a surface layer, said core being composed of a nucleus formed from (a) titanium dioxide or (b) iron oxide or (c) a mixture of iron oxide and titanium dioxide and an outer layer of titanium dioxide, said surface layer being formed from metal oxides of magnesium and calcium.

Composite fine particles of metal oxides and production thereof

Anti-discoloring pearly luster pigment and method of preparing the same

A porous carrier for a catalyst comprising metal coated with metal oxide grains having a mean grain size of 150 nm or less and a mean pore diameter of 5.5 nm or less, is obtained by subjecting:

Porous carrier for catalyst comprising metal oxide-coated metal and

Disclosed are a flaky pigment in which the surfaces of fine flaky grains, as a pigment base, have been coated with ultra-fine barium sulfate grains having a mean grain size of 0.1 .mu.m or less. The pigment is produced by a process comprising reacting: (a) an aqueous solution containing a complexing agent capable of forming a complex compound with barium ion, as dissolved therein; (b) an aqueous solution containing a water-soluble barium compound as dissolved therein; and (c) an aqueous solution containing sulfate ion. The invention involves this method of preparing the flaky pigment, and use of the pigment in pigment coloration of cosmetics, top coats for cars, plastics, printing inks, domestic electrical appliances, coating materials and coating paints for building materials.

Ultra-fine granular barium sulfate-coated flaky pigment and method of

The invention provides a flaky pigment comprising particles of a flaky substrate and particles of a pigment or dye, whereby said flaky pigment is in the form of an ordered mixture. The invention also involves preparation of the pigment by a process comprising subjecting said substrate and said pigment or dye to high speed stirring in the absence of a liquid medium.

Flaky pigment

A pigment comprising leaf-like substrates particles having a particle size of 0.5 to 100 .mu.m, whereby the surface of said particles is covered with a metal oxide comprising titanium oxide and zirconium oxide in a molar ratio of 10:1 to 10:15 within a range of from 20 wt. % to 60 wt. % based on the total weight of the pigment possesses good adhesion and spreadability and has an effect of preventing ultraviolet rays and infrared rays.

Growing community of inventors

Iwaki, Japan

Tamio Noguchi