Abstract: [Purpose] A purpose of the present invention is to provide a condensation-curable silicone composition having a curing property and storage stability. [Solution] The present invention provides a condensation-curable silicone composition comprising organopolysiloxane having an alkoxysilyl group and a compound represented by the following general formula (1): wherein R1 and R2 are, independently of each other, a hydrogen atom or an unsubstituted or substituted, monovalent hydrocarbon group having 1 to 12 carbon atoms, Ar is an unsubstituted or substituted aryl group having 6 to 20 carbon atoms or a heteroaryl group having 3 to 20 carbon atoms, and m is an integer of 0 to 3. Further, the present invention provides a method for preparing a silicone cured product that includes a step of subjecting the organopolysiloxane having an alkoxysilyl group to hydrolytic condensation in the presence of the compound represented by the afore-mentioned general formula (1) to obtain the silicone cured product.

Abstract: In a heat-shielding film formed of addition-curing silicone resin containing organopolysiloxane, organopolysiloxane includes the combination of a plurality of units including at least a R1SiO3/2 unit (a T unit), a R2R3SiO2/2 unit (a D unit), and a R4R5R6SiO1/2 unit (a M unit) (in each unit, R1 to R6 is aliphatic hydrocarbon or hydrogen), and the molar ratio of the T unit, the D unit, and the M unit among all structural units is T:33.3 mol % to 71.4 mol %, D:11.1 mol % to 42.9 mol %, and M:7.0 mol % to 42.9 mol %.

Abstract: One of purposes of the present invention is to provide an organopolysiloxane that has a low viscosity and allows a cured coating to achieve both high hardness and crack resistance, and provide a composition comprising the organopolysiloxane. An organopolysiloxane represented by the following average unit formula (1) and having a kinetic viscosity of 10 to 350 mm2/s at 25° C., wherein a proportion (%) of the number of silicon atoms in a unit represented by the following formula (1?) to a total number of silicon atoms in all siloxane units of the organopolysiloxane is 10% or less, wherein R1, R2, and R3 are, independently of each other, an unsubstituted or substituted, cyclic or non-cyclic alkyl group having 1 to 12 carbon atoms that may include an ether bond, or an unsubstituted or substituted aryl group having 6 to 12 carbon atoms, R4 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and a, b, c, d and e are numbers satisfying the equations 0.2?a?0, 1?b>0, 0.75?c?0, 0.

Abstract: A composition comprising (A) an organopolysiloxane having a structure represented by the following average formula (I) and a given amount of (B) a solvent having a relative permittivity of 7.0-9.0. (SiO4/2)a(R1SiO3/2)b(R12SiO2/2)c(R13SiO1/2)d(R2O1/2)e??(I) (In the formula, R1 is a hydrogen atom or an alkyl, aralkyl, or aryl group; R2 is a hydrogen atom or a methyl, ethyl, n-propyl, isopropyl, or acetyl group; a, b, c, and d are numbers satisfying 0?a<1, 0<b?1, 0?c<1, 0?d<1, and a+b+c+d=1; and e is a number satisfying 0<e?4.

Abstract: This alkoxysilyl group-containing perfluoropolyether compound represented by formula (1) is soluble in saturated hydrocarbon solvents and yields a coating film having excellent water repellency and oil repellency. X—Z-PFPE-Z—X??(1) (PFPE denotes a divalent perfluoropolyether chain having a number average molecular weight of 500-5000; X denotes a group represented by formula (2); Q1 denotes a divalent organic group having 2-12 carbon atoms; Q2 denotes a divalent organic group having 2-12 carbon atoms; R1 denotes an alkyl group having 1-12 carbon atoms; G denotes an alkyl group having 1-12 carbon atoms; a is 0-2; b is 1-3; c is 0-2; a, b and c are integers that satisfy the relationship a+b+c=3; d is an integer from 0 to 2; and the dotted line denotes a bond.) (Z denotes a divalent organic group represented by any of the formulae below.) (A dotted line denotes a bond, and ** denotes a bonding site to the PFPE.

Abstract: A steering gearbox is equipped with a casing, a rack shaft, and a plurality of bushes. The rack shaft is accommodated in a casing to be movable in an axial direction. The plurality of bushes support the rack shaft to be movable in the axial direction and are attached to the casing.

Abstract: Provided is a fluorine-containing siloxane acrylate represented by formula (1). X—Z-PFPE-Z—X ??(1) [PFPE is a divalent perfluoropolyether chain, X is a group represented by formula (2) {Y1 is a divalent organic group, R2 is a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group, and G is a monovalent hydrocarbon group or a group represented by formula (3) O—Si(CH3)2—Y1—OR1 ??(3) (R1 is a monovalent hydrocarbon group, and Y1 is same as mentioned above. The broken line represents a bond (hereinafter, the same shall apply.)) Q is a hydrogen atom or a group represented by formula (4) SiR33 ??(4) (R3 is a monovalent hydrocarbon group.) e is an integer of 0-2, f is an integer of 0-2, and g is an integer of 1-3, and e+f+g is 3.} Z is a predetermined divalent organic group.

Abstract: In a heat-shielding film formed of addition-curing silicone resin containing organopolysiloxane, organopolysiloxane includes the combination of a plurality of units including at least a R1SiO3/2 unit (a T unit), a R2R3SiO2/2 unit (a D unit), and a R4R5R6SiO1/2 unit (a M unit) (in each unit, R1 to R6 is aliphatic hydrocarbon or hydrogen), and the molar ratio of the T unit, the D unit, and the M unit among all structural units is T:33.3 mol % to 71.4 mol %, D:11.1 mol % to 42.9 mol %, and M:7.0 mol % to 42.9 mol %.

Abstract: This polysiloxane: comprises a hydrolytic condensation product of a silicon compound that contains a cyclic alkoxysiloxane represented by formula (1) (in the formula, R1 groups each independently denote a substituted or unsubstituted alkyl group having 1-3 carbon atoms, R2 groups each independently denote a substituted or unsubstituted alkyl group having 1-6 carbon atoms, and n denotes an integer between 3 and 8); has at least two hydrosilylable carbon-carbon unsaturated groups per molecule; has at least two hydrosilyl groups per molecule; and in which the inequality 0.25?t1<1 is satisfied, where t1 denotes the molar ratio of T units having a group represented by R1 relative to all siloxane units in the hydrolytic condensation product. The polysiloxane is addition crosslinkable, and is therefore suitable as a binder component of a heat-resistant paint or the like or as a coating material.

Abstract: A steering gearbox is equipped with a casing, a rack shaft, and a plurality of bushes. The rack shaft is accommodated in a casing to be movable in an axial direction. The plurality of bushes support the rack shaft to be movable in the axial direction and are attached to the casing.

Abstract: A composition comprising (A) an organopolysiloxane compound having a structure represented by average formula (I) and (B) 15 mass % or more solvent represented by general formula (II).

Abstract: This polysiloxane: comprises a hydrolytic condensation product of a silicon compound that contains a cyclic alkoxysiloxane represented by formula (1) (in the formula, R1 groups each independently denote a substituted or unsubstituted alkyl group having 1-3 carbon atoms, R2 groups each independently denote a substituted or unsubstituted alkyl group having 1-6 carbon atoms, and n denotes an integer between 3 and 8); has at least two hydrosilylable carbon-carbon unsaturated groups per molecule; has at least two hydrosilyl groups per molecule; and in which the inequality 0.25?t1<1 is satisfied, where t1 denotes the molar ratio of T units having a group represented by R1 relative to all siloxane units in the hydrolytic condensation product. The polysiloxane is addition crosslinkable, and is therefore suitable as a binder component of a heat-resistant paint or the like or as a coating material.