Abstract: Provided is a biofilm formation-preventing agent that improves the sustainability of an effect of a drug, and keeps an oral environment satisfactory in a sustainable manner, without an increase in drug concentration or treatment time to prevent the maturation of dental plaque into a biofilm, and a composition for oral use containing the biofilm formation-preventing agent. More specifically, the biofilm formation-preventing agent includes a copolymer having a weight-average molecular weight of from 10,000 to 5,000,000 and containing: 10 mol % to 90 mol % of a constituent unit (A) based on 2-(meth) acryloyloxyethyl phosphorylcholine; and 90 mol % to 10 mol % of at least one kind of constituent unit selected from the group consisting of a constituent unit (B1) based on an alkyl group-containing (meth) acrylic monomer, a constituent unit (B2) based on a quaternary ammonium group-containing (meth) acrylic monomer, and a constituent unit (B3) based on a (meth) acrylamide-based monomer.

Abstract: Provided by the present invention is a corrigent composed of a copolymer having a weight average molecular weight of 10,000-5,000,000 and comprising 10-90 mol % of a constitution unit based on 2-(meth)acryloyloxyethylphosphoryl choline, and 90-10 mol % of a (meth)acrylic monomer containing an alkyl group, a (meth)acrylic monomer containing a quaternary ammonium group and a constitution unit based on a (meth)acrylamide monomer. The present invention also provides a composition for mouth cavity containing the corrigent.

Abstract: Provided is an ophthalmic solution for treatment or prevention of lid wiper epitheliopathy, which is capable of imparting sufficient lubricity to a corneal surface or a soft contact lens surface. It has been found that the above-mentioned object can be achieved by an ophthalmic solution containing, at a specific ratio, a copolymer having a structure having three kinds of different constituent units at a specific ratio.

Abstract: An oral composition for reducing dentinal hypersensitivity according to the present invention comprises a phosphorylcholine-containing polymer as an active ingredient. A general consumer can use the oral composition routinely in various forms. The oral composition is brought into contact with an oral cavity of a user to reduce the dentinal hypersensitivity.

Abstract: An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.

Abstract: An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.

Abstract: To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.

Abstract: Provided is an ophthalmic solution of which preservative component, hexamethylene biguanide, contained therein is inhibited from being adsorbed on soft contact lenses and eye droppers. The ophthalmic solution contains, at a specific ratio, (A) hydroxypropyl methylcellulose having 28.0 to 30.0 mass % methoxy groups and 7.0 to 12.0 mass % hydroxypropoxy groups, both with respect to the total amount of the hydroxypropyl methylcellulose, at a methoxy group/hydroxypropoxy group ratio of 2.5 to 4.0 by mass, wherein a 2 mass % aqueous solution of the hydroxypropyl methylcellulose at 20° C. has a viscosity of 50 to 4000 mPa·s; (B) sodium chloride or potassium chloride; (C) hexamethylene biguanide or a salt thereof; (D) 2-methacryloyloxyethyl phosphorylcholine/butyl methacrylate copolymer; and (E) water.

Abstract: Disclosed is a magnetic material having high Hc and High Curie point, which is capable of controlling such magnetic characteristics without requiring rare or expensive raw materials. Specifically disclosed is a magnetic material composed of particles of a magnetic iron oxide which is represented by the following general formula: ?-AxByFe2?x?yO3 or ?-AxByCzFe2?x?y?zO3 (wherein A, B and C each represents a metal excluding Fe and different from each other, satisfying 0<x, y, z<1), with ?-Fe2O3 as a main phase.

Abstract: To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.

Abstract: Disclosed is a magnetic material comprising a crystal of ?-GaxFe2-xO3 (wherein 0<x<1) prepared by substituting a part of Ga3+ ion sites of an ?-Fe2O3 crystal with Fe3+ ions and having X-ray diffraction peaks corresponding to the crystal structure of ?-Fe2O3. The coercive force of the magnetic material lowers in accordance with the Ga content thereof, and the saturation magnetization thereof has a maximum value.

Abstract: Disclosed is a magnetic crystal for electromagnetic wave absorbing materials, having a structure of ?-MxFe2-xO3 with 0<x<1, which has the same space group as that of an ?-Fe2O3 crystal and which is derived from an ?-Fe2O3 crystal by substituting a part of the Fe site therein with M. In this, M is a trivalent element having an effect of lowering the coercive force Hc of ?-Fe2O3 crystal by the substitution. Concretely, the element M includes Al and Ga. An electromagnetic wave absorber having a packed structure of particles having such a substituent element M-added “M-substituted ?-Fe2O3 crystal” as the magnetic phase may control the electromagnetic wave absorption peak frequency depending on the degree of substitution with the element M, and for example, the invention gives an electromagnetic wave absorber applicable to a 76 GHz band for on-vehicle radars.

Abstract: Disclosed is a magnetic crystal for electromagnetic wave absorbing materials, having a structure of ?-MxFe2-xO3 with 0<x<1, which has the same space group as that of an ?-Fe2O3 crystal and which is derived from an ?-Fe2O3 crystal by substituting a part of the Fe site therein with M. In this, M is a trivalent element having an effect of lowering the coercive force Hc of ?-Fe2O3 crystal by the substitution. Concretely, the element M includes Al and Ga. An electromagnetic wave absorber having a packed structure of particles having such a substituent element M-added “M-substituted ?-Fe2O3 crystal” as the magnetic phase may control the electromagnetic wave absorption peak frequency depending on the degree of substitution with the element M, and for example, the invention gives an electromagnetic wave absorber applicable to a 76 GHz band for on-vehicle radars.

Abstract: A magnetic material is provided that has an iron oxide phase whose principal phase is a crystal of a structure which has the same space group as ?-Fe2O3 crystal and in which Al is substituted for a portion of the Fe sites of the ?-Fe2O3 crystal. The molar ratio of Al to Fe in the iron oxide phase, when expressed as Al:Fe=x:(2?x), satisfies 0?x?1. The value of x is preferably in the range of 0.3 to 0.7. The average particle diameter of the powder determined from a TEM image is preferably 5 to 200 nm, more preferably 10 to 100 nm. The magnetic material has very high practical value because it enables the extremely high coercive force Hc of the ?-Fe2O3 crystal to be regulated to a level enabling utilization in magnetic recording medium and various other applications. The magnetic powder can be produced by a method combining the reverse micelle method and the sol-gel method.

Abstract: Disclosed is a magnetic material having high Hc and High Curie point, which is capable of controlling such magnetic characteristics without requiring rare or expensive raw materials. Specifically disclosed is a magnetic material composed of particles of a magnetic iron oxide which is represented by the following general formula: ?-AxByFe2?x?yO3 or ?-AxByCzFe2?x?y?zO3 (wherein A, B and C each represents a metal excluding Fe and different from each other, satisfying 0<x, y, z<1), with ?-Fe2O3 as a main phase.

Abstract: A magnetic material composed of ?-InxFe2-xO3 (wherein 0<x?0.30) crystal in which In is substituted for a portion of the Fe sites of the ?-Fe2O3 crystal. The crystal exhibits an X-ray diffraction pattern similar to that of an ?-Fe2O3 crystal structure and has the same space group as that of an ?-Fe2O3. The In content imparts to the magnetic material a magnetic phase transition temperature that is lower than that of the ?-Fe2O3 and a spin reorientation temperature that is higher than that of the ?-Fe2O3. The In content can also give the magnetic material a peak temperature of the imaginary part of the complex dielectric constant that is higher than that of the ?-Fe2O3.

Abstract: A magnetic material is provided that has an iron oxide phase whose principal phase is a crystal of a structure which has the same space group as ?-Fe2O3 crystal and in which Al is substituted for a portion of the Fe sites of the ?-Fe2O3 crystal. The molar ratio of Al to Fe in the iron oxide phase, when expressed as Al:Fe=x:(2?x), satisfies 0?x?1. The value of x is preferably in the range of 0.3 to 0.7. The average particle diameter of the powder determined from a TEM image is preferably 5 to 200 nm, more preferably 10 to 100 nm. The magnetic material has very high practical value because it enables the extremely high coercive force Hc of the ?-Fe2O3 crystal to be regulated to a level enabling utilization in magnetic recording medium and various other applications. The magnetic powder can be produced by a method combining the reverse micelle method and the sol-gel method.

Abstract: A magnetic material composed of ?-InxFe2-xO3 (wherein 0<x?0.30) crystal in which In is substituted for a portion of the Fe sites of the ?-Fe2O3 crystal. The crystal exhibits an X-ray diffraction pattern similar to that of an ?-Fe2O3 crystal structure and has the same space group as that of an ?-Fe2O3. The In content imparts to the magnetic material a magnetic phase transition temperature that is lower than that of the ?-Fe2O3 and a spin reorientation temperature that is higher than that of the ?-Fe2O3. The In content can also give the magnetic material a peak temperature of the imaginary part of the complex dielectric constant that is higher than that of the ?-Fe2O3.