# US 8,785,535 B2 · Fibrous basic magnesium sulfate powder and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,535 B2 - Document ID: US8785535B2 - Status: Granted - Kind: B2 - Application number: 14/002,414 - Filed: 2012-03-02 - Published: 2014-02-13 - Granted: 2014-07-22 - Earliest claimed: 2011-03-02 - Assignees: Ube Material Industries, Ltd. - Applicants: Ryoichi Nomura; Tatsuki Okutsu - Inventors: Ryoichi Nomura; Tatsuki Okutsu - Web page: https://patentgrep.com/patent/US8785535B2 ## CPC - C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds - C01F 5/40: Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00) - C08J 5/0405: {with inorganic fibres} - C08J 5/06: using pretreated fibrous materials - C08K 7/02: Fibres or whiskers - C08L 101/00: Compositions of unspecified macromolecular compounds - C01P 2002/82: by IR- or Raman-data - C01P 2004/10: extending in one dimension, e.g. needle-like - C01P 2006/80: Compositional purity - C08J 2300/22: Thermoplastic resins - C08J 2323/12: Polypropene - C08K 7/08: Oxygen-containing compounds - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS ## Abstract A fibrous basic magnesium sulfate powder which does not contain CO2 in an amount of more than 0.15% by mass, or a fibrous basic magnesium sulfate powder which has a ratio of the infrared absorption within the wave number range of 1,400-1,440 cm−1 relative to the infrared absorption within the wave number range of 3,180-3,530 cm−1 of 0.005 or less. The fibrous basic magnesium sulfate powders exhibit improved physical property-improving effect when dispersed in a resin material. ## Claims ### Claim 1 A fibrous basic magnesium sulfate powder containing CO2 in an amount of not more than 0.15 wt. %. ### Claim 2 (depends on 1) The fibrous basic magnesium sulfate powder of claim 1, in which the amount of CO2 is not more than 0.13 wt. %. ### Claim 3 (depends on 2) The fibrous basic magnesium sulfate powder of claim 2, in which the amount of CO2 is in the range of 0.001 to 0.13 wt. %. ### Claim 4 (depends on 1) The fibrous basic magnesium sulfate powder of claim 1, in which a ratio of an amount of infrared rays absorbed in the wave number region of 1,400 to 1,440 cm−1 to an amount of infrared rays absorbed in the wave number region of 3,180 to 3,530 cm−is not more than 0.005. ### Claim 5 A fibrous basic magnesium sulfate powder in which a ratio of an amount of infrared rays absorbed in the wave number region of 1,400 to 1,440 cm−to an amount of infrared rays absorbed in the wave number region of 3,180 to 3,530 cm−1 is not more than 0.005. ### Claim 6 (depends on 5) The fibrous basic magnesium sulfate powder of claim 5, in which the ratio is not more than 0.002. ### Claim 7 (depends on 6) The fibrous basic magnesium sulfate powder of claim 6, in which the ratio is in the range of 0.0001 to 0.002. ### Claim 8 (depends on 1) A process for preparing a fibrous basic magnesium sulfate powder of claim 1 which comprises the steps of: recovering fibrous basic magnesium sulfate particles which have been produced by the reaction of magnesium sulfate and a basic compound in an aqueous medium; and drying the recovered fibrous basic magnesium sulfate particles containing water in a gaseous atmosphere adjusted to contain CO2 gas in an amount of not more than 360 μL per one liter of the volume of the gaseous atmosphere. ### Claim 9 (depends on 8) The process of claim 8, which further comprises a step of washing the recovered water-containing fibrous basic magnesium sulfate particles with a decarboxylated water in advance of the drying step. ### Claim 10 (depends on 1) A process for preparing a fibrous basic magnesium sulfate powder of claim 1 which comprises the steps of: producing fibrous basic magnesium sulfate particles by the reaction of magnesium sulfate and a basic magnesium compound selected from the group consisting of magnesium hydroxide and magnesium oxide in an aqueous medium; recovering fibrous basic magnesium sulfate particles from the aqueous medium to obtain water-containing fibrous magnesium sulfate particles; and drying the water-containing fibrous basic magnesium sulfate particles in a drying oven adjusted to contain CO2 gas in an amount of not more than 360 μL per one liter of the volume of the drying oven. ### Claim 11 (depends on 1) A process for preparing a fibrous basic magnesium sulfate powder of claim 1 which comprises the steps of: producing fibrous basic magnesium sulfate particles by the reaction of a mixture of magnesium sulfate and magnesium hydroxide which has been prepared by adding sodium hydroxide to an aqueous magnesium sulfate and magnesium oxide in an aqueous medium; recovering fibrous basic magnesium sulfate particles from the aqueous medium to obtain water-containing fibrous magnesium sulfate particles; and drying the water-containing fibrous basic magnesium sulfate particles in a drying oven adjusted to contain CO2 gas in an amount of not more than 360 μL per one liter of the volume of the drying oven. ### Claim 12 A method for preparing a fibrous basic magnesium sulfate powder which comprises drying water-containing fibrous basic magnesium sulfate particles in a drying oven adjusted to contain CO2 gas in an amount of not more than 360 μL per one liter of the volume of the drying oven. ### Claim 13 (depends on 12) The method of claim 12, in which the water contained in the water-containing fibrous basic magnesium sulfate particles is decarboxylated water. ### Claim 14 A resin composition containing a fibrous basic magnesium sulfate powder dispersed therein in which the fibrous basic magnesium sulfate powder contains CO2 in an amount of not more than 0.15 wt. %. ### Claim 15 A resin composition containing a fibrous basic magnesium sulfate powder dispersed therein in which the fibrous basic magnesium sulfate powder in which a ratio of an amount of infrared rays absorbed in the wave number region of 1,400 to 1,440 cm−to an amount of infrared rays absorbed in the wave number region of 3,180 to 3,530 cm−is not more than 0.005.