Abstract: An additive for synthetic resins is provided which comprises composite particles obtained by depositing a calcium phosphate compound (R) on support particles (M) of a petaloid porous structure. The additive of the present invention provides synthetic resin compositions having excellent transparency, anti-scratch property, anti-blocking property and less discoloration caused by deterioration of resin.

Abstract: A glycol dispersion of an inorganic powder is provided, which comprises glycol and an inorganic powder dispersed therein, said inorganic powder being surface-treated with a dispersant having a solubility of not less than 5 (g/100 g-water) in water of 20° C., and which contains water and/or methanol in the specific amounts. According to the present invention, it is not required to transport a slurry of water, methanol or glycol, but possible to transport in the form of powder, so that efficiency in transportation is not only enhanced, but a drastic simplification in the production steps and a cost reduction are attainable because neither a distillation apparatus for replacing a solvent such as water and methanol with glycol nor a step of wet-pulverizing is required. Moreover, a glycol dispersion of the present invention is able to reproduce the excellent shape and size of the inorganic particles before drying or in the initial state and therefore has an excellent dispersibility.

Abstract: An additive for synthetic resins is provided which comprises particles of a petaloid hydroxyapatite represented by a chemical formula Ca10(PO4)6(OH)2, having the specified particle diameter, degree of dispersion: and specific surface area, and a synthetic resin composition blended with the additive is also provided. By the use of the additive of the present invention, a film satisfying anti-blocking property, transparency and anti-scratch property can be obtained.

Abstract: A food additive slurry or powder composition which comprises 100 parts by weight of at least one selected from the group consisting of calcium carbonate, calcium phosphate and ferric pyrophosphate (A) and 1 to 60 parts by weight of gum arabic (B), anda calcium ion concentration M (mg/l) satisfying 10<M≦500. The composition is superior not only in re-dispersibility and dispersion stability in liquid for a long period of time, and flavor, but is capable of providing highly concentrated products, and therefor it is advantageous economically.

Abstract: An additive for synthetic resins is provided. The additive comprises particles surface-coated with a petaloid porous hydroxyapatite having a chemical formula Ca.sub.5 (PO.sub.4).sub.3 (OH) and the petaloid porous hydroxyapatite is not less than 5% by weight of the particles. The additive can be added to any kinds of synthetic resins. If the additive is used in a polyethylene film, blocking of the film is not only prevented, but good transparency and good anti-scratch ability are imparted, and if the additive is used in a polyester, a film having good slipperiness, anti-abrasion and less coarse protrusions can be provided.

Abstract: An additive for synthetic resins is provided. The additive comprises particles surface-coated with a petaloid porous hydroxyapatite having a chemical formula Ca.sub.5 (PO.sub.4 ).sub.3 (OH) and the petaloid porous hydroxyapatite is not less than 5% by weight of the particles. The additive can be added to any kinds of synthetic resins. If the additive is used in a polyethylene film, blocking of the film is not only prevented, but good transparency and good anti-scratch ability are imparted, and if the additive is used in a polyester, a film having good slipperiness, anti-abrasion and less coarse protrusions can be provided.

Abstract: A monodisperse spherical, ellipsoidal or plate-like vaterite calcium carbonate almost free from secondary aggregation is disclosed. The vaterite type calcium carbonate is prepared by the steps of adding 5-20 times mol equivalent of water with respect to unslaked lime to a methanol suspension of 0.5-12 weight % of unslaked lime and/or slaked lime (in case of slaked, conversion is to be made into unslaked lime of the same mol) to prepare of a mixture of methanol, unslaked lime and/or slaked lime and water, letting carbon dioxide gas through said mixture, adjusting the temperature in the carbonation reaction system to not less than 30.degree. C. before arrival of conductivity within carbonation reaction system at the maximal point on conductivity variation curve in the carbonation reaction system and adjusting the time from start of carbonation reaction to the point where the conductivity is 100 .mu.S/cm to be less than 1,000 minutes.

Abstract: A polyester composition is disclosed, which is characterized in that it contains, besides polyester, vaterite-type calcium carbonate obtainable through carbonation reaction of a calcium compound in a mixed medium of alcohol and water. The polyester composition is superior in compatibility between the polyester and the vaterite-type calcium carbonate.

Abstract: A monodisperse spherical, ellipsoidal or plate-like vaterite calcium carbonate almost free from secondary aggregation is disclosed. The vaterite type calcium carbonate is prepared by the steps of adding 5-20 times mol equivalent of water with respect to unslaked lime to a methanol suspension of 0.5-12 weight % of unslaked lime and/or slaked lime (in case of slaked, conversion is to be made into unslaked lime of the same mol) to prepare of a mixture of methanol, unslaked lime and/or slaked lime and water, letting carbon dioxide gas through said mixture, adjusting the temperature in the carbonation reaction systemto not less than 30.degree. C. before arrival of conductivity within carbonation reaction system at the maximal point on conductivity variation curve in the carbonation reaction system and adjusting the time from start of carbonation reaction to the point where the conductivity is 100.mu. S/cm to be less than 1,000 minutes.

Abstract: The present invention provides a glycol dispersion comprising calcium carbonate and glycol prepared by wet-grinding under the specified conditions a glycol slurry composed of glycol and calcium carbonate satisfying the specified dispersibility and particle size. The glycol dispersion of the present invention is good in dispersion stability in glycol and is capable of improving running property of audio tapes, video tapes, etc., thus contributing to improvement in properties such as sound and image.

Abstract: The present invention provides a glycol dispersion consisting of calcium carbonate and glycol prepared by wet grinding a glycol slurry composed of glycol and calcium carbonate surface-treated with at least one of surface treating agents selected from the group consisting of copolymers (A) of at least one of .alpha., .beta.-monoethylenically unsaturated carboxylic acids and their salts with .alpha., .beta.-monoethylenically unsaturated carboxylic acid esters and salts (B) of copolymers of .alpha., .beta.-monoethylencially unsaturated carboxylic acids with .alpha., .beta.-monoethylencially unsaturated carboxylic acid esters as material for wet grinding. The glycol dispersion of the present invention is good in dispersion stability in glycol as well as affinity with polyester and contributes to improvement of the surface properties of polyester. Furthermore, proper selection of a specific grade of calcium carbonate and specific grinding conditions enable provision of highly functional polyester products.

Abstract: The present invention provides a filler for paper-making containing 0.1 weight part or more of a particle composition meeting the requirements (A), (B) and (C) below per 100 weight parts of heavy calcium carbonate and a neutral paper-making process by the use thereof:(A): Zeta potential (Suspension concentration 1,000 ppm in pure water, measuring temperature 20.degree. C.) is negative;(B): Particle size "d" of the composition resulting from dispersion for 10 minutes of a 10 weight % aqueous suspension of the above-mentioned particle composition by ultrasonic dispersing means measured by the use of the standard sieve of JIS Z8801 is:22 .mu.m<d.ltoreq.150 .mu.m(C): Specific surface area S (cm.sup.2 /g) of the above-mentioned particle composition measured by the BBT method is within the range shown by the formula (1) below:S>100,000/D.multidot..rho. (1)where:D=Average particle size (.mu.m) of the composition.rho.=Specific gravity of the composition.