Abstract: The invention relates to the selection of a natural calcium carbonate crushed to a high degree of fineness, possibly treated with one or more fatty acids or one or more of their salts or mixtures thereof, and its use as a rheology regulator for polymeric compositions. The specific surface area is 14 to 30 m2/g measured according to the BET method to ISO 4652, and the oil absorption is greater than 16 measured according to ISO 787-V (Rub-out method). The conditions of mixing of the constituents and manufacture are improved, as well as the properties of the final product.

Abstract: The invention relates to the selection of a natural calcium carbonate crushed to a high degree of fineness, possibly treated with one or more fatty acids or one or more of their salts or mixtures thereof, and its use as a rheology regulator for polymeric compositions.

Abstract: An aqueous sespension, comprising; (1) water, (2) at least one mineral substance, and (3) a copolymer which comprises the following monomers in polymerized form: (a) at least one ethylenically unsaturated monomer having at least one carboxyl function, (b) optionally, at least one ethylenically unsaturated monomer having at least one sulphonyl function or phosphoryl function, (c) optionally, at least one ethylenically unsaturated monomer having no carboxyl function, (d) at least one ethylenically unsaturated oxyalkylated monomer terminating with a specified hydrophobic group, where the copolymer has a specific viscosity at most equal to 50. The suspension is useful in, for example, paper manufacturing and in the manufacture of coating colors for paper.

Abstract: An aqueous suspension, comprising:(1) water,(2) at least one mineral substance, and(3) a copolymer which comprises the following monomers in polymerized form:(a) at least one ethylenically unsaturated monomer having at least one carboxyl function,(b) optionally, at least one ethylenically unsaturated monomer having at least one sulphonyl function or phosphoryl function,(c) optionally, at least one ethylenically unsaturated monomer having no carboxyl function,(d) at least one ethylenically unsaturated oxyalkylated monomer terminating with a specified hydrophobic group,where the copolymer has a specific viscosity at most equal to 50. The suspension is useful in, for example, paper manufacturing and in the manufacture of coating colors for paper.

Abstract: A slurry containing water, carbonate-containing pigment, and dispersant consisting of 25-70 % by weight of agglomerated carbonate-containing pigment, 0.1-1.0% by weight of a dispersant, the balance being water up to 100%, can be used advantageously in papermaking as well as in the paint and lacquer industry. In a novel process for agglomerating ultra-fine particles in slurries the slurry is subjected to heat treatment until the agglomeration is complete.

Abstract: Carbonate containing mineral fillers, and more particularly natural and/or precipitated calcium carbonates, characterized by the following grain size distribution:______________________________________ <61 .mu.m: 100% <56 .mu.m: 95-100% <40 .mu.m: 90-100% <20 .mu.m: 48-95% <10 .mu.m: 15-52% <5 .mu.m: 9-28% <1 .mu.m: 0-10% d.sub.50 : 9.6-20.5 .mu.m ______________________________________may with advantage be employed as mineral fillers, preferably as matting agents and in a more especially preferred fashion for aqueous paint systems.

Abstract: A CaCO.sub.3 -talc coating pigment slurry consists of the following four co-ground components:a. 24 to 64% by weight CaCo.sub.3,b. 5 to 48% by weight talc,c. 20 to 40% by weight H.sub.2 O, andd. an adjuvant combination consisting of0.05 to 1.4% by weight of at least one commercially available grinding acid and0.05 to 1.2% by weight of at least one commercially available dispersing agent,wherein the mixed pigments have an average statistical particle diameter of 0.4 .mu.m to 1.5 .mu.m. That coating pigment slurry can be used to special advantage to prepare a composition for coating papers for gravure printing.

Abstract: A method for the production of natural and/or synthetic carbonates, and more particularly calcium carbonates, with a high BET/N.sub.2 specific surface area of over 20 m.sup.2 /g, and more particularly of between 20 to 50 m.sup.2 /g, utilizes an inherently known mill such as an agitating ball mill. The carbonates in an aqueous suspension are wet ground and the entire suspension is recirculated; that is, subjected to additional wet grinding, until the final product has the desired specific surface area. Furthermore, the solids concentration during the entire duration of the wet grinding operation is maintained at no more than 24% by weight. The products of the method have surprisingly valuable properties and can be employed in the plastics industry, in sealants, in the rubber industry, in printing inks, in cosmetics, in pharmaceuticals, in cigarette paper, in wood varnishes, in high gloss paper and in plastisols.

Abstract: In a process for industrial fractionation of polymers using an extraction column and a homogeneous extraction agent a homogeneous feed is supplied to a region of the extraction column which is nearer the upper end thereof when the feed has a greater density than the extraction agent and which is nearer the lower end thereof when the feed has a lower density than the extraction agent. An apparatus for carrying out this process consists advantageously, instead of a pulsed sieve plate column as hitherto, of an unpulsed filling body column which leads to a better separation because a back mixing is avoided in favourable manner.

Abstract: Coherent thermoplastic aggregates with very high content of pulverized mineral materials, composed of the said materials, of polyolefin polymers and/or copolymers, and possibly also of various familiar adjuvants, characterized by the fact that, in order for them to have both a volumetric mass close to or at most equal to the theoretical volumetric mass of the pulverized mineral substances entering into their composition and an excellent compatibility with redispersion polymers, the polymers and/or copolymers entering into the composition of the said aggregates in presence of a fluidizing agent are chosen within the group of thermoplastics with melting and/or softening point at least equal to 60.degree. C. and index of fluidity at least 50 (measured according to the standard ASTM D 1238) of the polyolefin type, other than those containing a polar monomer.