Shin-Etsu Chemical Patente

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Provided are a transparent ceramic for a magneto-optical element and a magneto-optical device, which have practical transparency applicable to high power, and have a high thermal conductivity as compared with the related art, even a composite oxide containing a rare earth element having a large ionic radius. The transparent ceramic for a magneto-optical element includes a sintered body of a composite oxide represented by Formula (1), (Tb_1-x-yR1_xR2_y)₃Al₅O₁₂ ... Formula (1)wherein R1 represents Y or Lu, R2 represents Gd or La, and 0 < x ≤ 0.4, 0 < y ≤ 0.4, and 0.05 ≤ x + y ≤ 0.45 are satisfied. An average ionic radius of a rare earth element in the composite oxide satisfies Formula (2), Averageionicradius=1−x−yDTb+xDR1+yDR2<104.2wherein, D_Tb represents an ionic radius of Tb³⁺ at an 8-coordination site, D_R1 represents an ionic radius of R1³⁺ at the 8-coordination site, and D_R2 represents an ionic radius of R2³⁺ at the 8-coordination site. The magneto-optical device is an optical isolator including the transparent ceramic as a Faraday rotator 110.

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The present invention is a negative electrode body including a negative electrode including a negative electrode current collector having a roughened surface, a negative electrode active material layer provided on the negative electrode current collector, and an ion-conductive layer having lithium-ion conductivity and disposed on a surface of the negative electrode active material layer, and a solid electrolyte layer disposed contiguous to the ion-conductive layer, in which the negative electrode active material layer comprises negative electrode active material particles having a compound containing lithium, silicon, and oxygen, the negative electrode active material particles are represented by SiO_x1Li_y1, and a value of "x1" is more than 0.8 and 1.2 or less, and a value of "y1" is 0.5 or more and 3.4 or less. This provides the negative electrode body having the negative electrode capable of significantly increasing capacity while maintaining excellent battery characteristics, and suppressing expansion at full charge.

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Provided are a colloidal silica that maintains low viscosity even at high concentration and exhibits minimal viscosity increase during long-term storage and a method for producing the same. The colloidal silica contains silica particles, at least one dispersant selected from 1,2-benzisothiazolin-3-one and isothiazolin-3-one, and water.

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Provided is a cosmetic which contains a silicone gel obtained by swelling the following ingredient (a) with the following ingredient (b) and which has excellent emulsion stability, satisfactorily spreads when applied, and gives an excellent use feeling.(a): A crosslinked glycerin-modified silicone obtained by crosslinking dimethylpolysiloxane with a glycerin chain.(b): An oil having a 25°C dynamic viscosity of 0.5-5 mm²/s.

Provided is a terbium-including paramagnetic garnet-type transparent ceramic in which a maximum change amount of an incident laser beam diameter can be kept to 10% or less even in a case in which incidence power of laser light having a wavelength of 1064 nm and a beam diameter of 1.6 mm is increased to 160 W. The terbium-including paramagnetic garnet-type transparent ceramic includes a sintered body of a composite oxide represented by Formula (1): (Tb<1-x-y>Y<x>Sc<y>)<3>(Al<1-z>Sc<z>)<5>O<12> (1) (0.35 ≤ x ≤ 0.45, 0 < y < 0.03, 0.5 < 1-x-y < 0.65, 0.001 < z < 0.03, and 0 < y + z < 0.06), and has a total light transmittance of 84.8% or more at a wavelength of 600 nm. A magneto-optical element is an optical isolator that includes the transparent ceramic as a Faraday rotator 110, includes a polarizer 120 and an analyzer 130 on a front and back side of an optical axis 102 of the Faraday rotator, and is usable in a wavelength band of 0.9 µm or greater and 1.1 µm or less.

A hydrocarbon terminal group-containing compound represented by formula (1) is capable of forming a cured film that is excellent in water repellency, slipperiness, ease of cleaning off dirt, wear resistance, and chemical resistance. <img class="EMIRef" id="44840122-a119-4c4b-af2c-a3e3b52099d3-ia01" /> (R<1> is a C3 to C32 monovalent hydrocarbon group that may contain O, S, N, or Si; R<2> is H, a halogen atom, a hydroxyl group, a siloxy group, an amino group, a thiol group, a monovalent hydrocarbon group, R<1>, or -Y-A; U is C, Si, N, or a trivalent or tetravalent organic group; V is a single bond or a divalent hydrocarbon group that may contain O, N, or S; Z is a single bond, C, Si, N, S, or a trivalent to octavalent organic group; Y is a divalent hydrocarbon group that may contain O, N, S, or Si; A is a monovalent reactive group; k is a value of 0 or 1; and m is a value of 1-7.)

The present invention is a thermally conductive silicone composition in which a hydrolyzable organopolysiloxane represented by the following general formula (1) is compounded as a component (C), and a cured product thereof. As a result, a thermally conductive silicone composition and a cured product thereof are provided:wherein R¹ is independently an aromatic hydrocarbon group having 6 to 10 carbon atoms; R² is independently an alkyl group having 1 to 10 carbon atoms; R³ is an alkyl group having 1 to 4 carbon atoms; "a"is 2 or 3; and "n" s an integer of 2 ≤ n ≤ 60.

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The present invention is a thermally conductive sheet of a cured product of a silicone composition, including: (a) organopolysiloxane having 2 to 10 alkenyl groups only in a side chain; (b) organohydrogenpolysiloxane having hydrosilyl groups at both ends; (c) a thermally conductive filler; (d) a platinum-based curing catalyst; and (e) dimethylpolysiloxane having one end blocked with a trialcoxysilyl group, wherein the thermally conductive sheet has a hardness of 7 or less, maximum stress of 0.7 MPa or less when compressed by 50% at a compression speed of 3 mm/min, residual stress of 0.1 MPa or more, and a ratio of the max stress to the residual stress of 7/1 or less. This can provide a thermally conductive sheet with excellent thermal conductivity, a small difference between maximum stress and residual stress, and a suitable balance between compressibility and resilience, as a heat dissipation member for automotive components.

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