Omya International AG

Oftringen, Switzerland

Omya International AG

Oftringen, Switzerland

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Patent
Omya International AG and Coatex | Date: 2017-03-08

The present invention is directed to a process for producing an aqueous suspension of precipitated calcium carbonate, wherein a milk of lime is prepared by mixing water, a calcium oxide containing material, at least one water-soluble polymer having a molecular weight Mw in the range from 200 to 6500 g/mol, and at least one slaking additive, and subsequently, the milk of lime is carbonated to form an aqueous suspension of precipitated calcium carbonate.


The present invention relates to an aqueous slurry comprising natural ground calcium carbonate which has a percentage P_(5 )by weight of particles having a diameter of less than 5.0 m of from 98.5% to 90%, a percentage P_(2 )by weight of particles having a diameter of less than 2.0 m of from 96% to 80%, wherein the ratio of P_(2)/P_(5 )is from 0.98 to 0.85, and wherein the slurry has a solids content of more than 78 wt %.


Patent
Omya International AG | Date: 2017-03-22

The present invention relates to a fiber board product comprising fibers in an amount from 50.0 to 99.0 parts by weight (d/d), at least one particulate calcium carbonate- containing material in an amount from 1.0 to 50.0 parts by weight (d/d), at least one binder in an amount from 0.05 to 25.0 parts by weight (d/d), at least one wax in an amount from 0 to 5.0 parts by weight (d/d), wherein the sum of the fibers and the at least one particulate calcium carbonate-containing material is 100.0 parts by weight (d/d), a process for manufacturing such a fiber board product as well as an use of at least one particulate calcium carbonate-containing material having a weight median particle size d50 of 0.5 to 150.0 m as fiber replacement in a fiber board product, preferably in a high-density fiber (HDF) board, medium-density fiber (MDF) board, low-density fiber (LDF) board or particle board.


Patent
Omya International AG | Date: 2017-04-26

The present invention relates to a method for the control of odour by contacting surface-reacted calcium carbonate with odourants, wherein the surface-reacted calcium carbonate is a reaction product of natural ground or precipitated calcium carbonate with carbon dioxide and one or more acids, wherein the carbon dioxide is formed in situ by the acid treatment and/or is supplied from an external source, to the use of the surface-reacted calcium carbonate for the control of odour, as well as to products for the control of odour containing surface reacted calcium carbonate.


Patent
Omya International AG | Date: 2017-01-27

The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)_(2 )in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)_(2), per mole of Ca(OH)_(2), (b) dewatering and dispersing the precipitated calcium carbonate seeds prepared in step (a) to obtain an aqueous suspension of precipitated calcium carbonate seeds having a d_(50 )of less than or equal to 0.1 to 0.3 m and a BET specific surface area of 10 to 30 m^(2)/g, and (c) forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)_(2 )in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds obtained in step (b), wherein the precipitated calcium carbonate seeds have a d_(50 )that is less than the d_(50 )of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product obtained in step (c) characterized in that the dewatering of step (b) is carried out by the use of a tube press.


Patent
Omya International AG | Date: 2017-04-12

The present invention relates to a polymer composition comprising at least 20.0 wt.-%, based on the total weight of the polymer composition, of at least one biodegradable polymer resin, from 0.1 to 20.0 wt.-%, based on the total weight of the polymer composition, of at least one polyolefin selected from polyethylene and/or polypropylene and from 5.9 to 60.0 wt.-%, based on the total weight of the polymer composition, of an inorganic filler material dispersed in the at least one polyolefin and the at least one biodegradable polymer resin, a process for the preparation of such a polymer composition, the use of an inorganic filler material for increasing the thermal stability and/or processability of a polymer composition, the use of the polymer composition for the preparation of an article as well as in a process selected from extrusion process, co-extrusion process, blown film extrusion process, cast film extrusion or sheet extrusion process, extrusion coating process, injection molding process, blow molding process, thermoforming process as well as an article comprising the polymer composition.


The present invention relates to surface-reacted calcium carbonate, wherein the surface-reacted calcium carbonate is a reaction product of natural or synthetic calcium carbonate with carbon dioxide and at least one acid. Said calcium carbonate and oral compositions containing the same can be used in remineralisation and/or whitening of teeth.


Patent
Omya International AG | Date: 2017-04-05

The present invention relates to crumbles comprising at least one calcium carbonate- containing material, a process for the preparation of the crumbles, an article comprising the crumbles as well as an use of the crumbles in paper making, paper coating, food, plastic, preferably films, more preferably blown films or breathable films, fibres, polyvinyl chloride, plastisols, thermosetting polymers, more preferably thermosetting unsaturated polyesters or thermosetting unsaturated polyurethanes, agricultural, paint, coatings, adhesives, sealants, pharmaceuticals, agricultural, construction and/or cosmetic applications.


Patent
Omya International AG | Date: 2017-04-05

The present invention relates to a method of manufacturing a surface-modified material, wherein a substrate, which comprises on at least one side a coating layer comprising a salifiable alkaline or alkaline earth compound, is treated with a liquid composition comprising an acid to form at least one surface-modified region on the coating layer.


Patent
Omya International AG | Date: 2017-04-05

The present invention relates to the field of rotogravure printing, and more specifically to a rotogravure printing medium, a coating composition for rotogravure printing media, a method for producing such a rotogravure printing medium and an use of the rotogravure printing medium in a printing application, preferably in rotogravure printing using electrostatic assist (ESA).

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