A reaction product containing a non-cyclic alkoxy-functional polysiloxane is produced by heating a reaction system, which contains a cyclic polyorganosiloxane of the formula [(R.sup.1.sub.2SiO).sub.2/2].sub.n, where the subscript n is an integer of at least 4 and each R.sup.1 is an alkyl group or aryl group; a silane of the formula R.sup.2.sub.(4−m)Si(OR.sup.3).sub.m, where the subscript m is an integer from 1 to 4, each R.sup.2 independently is an alkyl group or aryl group, a hydrocarbyl group or a halogenated hydrocarbyl group and each R.sup.3 independently is an alkyl group; and a catalyst system comprising a metal trifluoromethanesulfonate of the formula [M].sup.+[CF.sub.3SO.sub.3].sup.−, where M is a metal atom selected from sodium (Na) and potassium (K), and a Brønsted acid, wherein Brønsted acids having a pKa≤3.0, preferably having a pKa≤2.0, particularly preferably having a pKa≤−0.0 are used.

A polysiloxane-substituted quinacridone pigment is produced by a quinacridone pigment with an epoxy-terminated polysiloxane under conditions effective to cause the epoxy group on the polysiloxane to react with, and bond the polysiloxane to, the quinacridone pigment. The quinacridone pigment thus produced has the polysiloxane grouping bonded to one of the quinacridone nitrogen atoms via a hydrocarbon linking group, which bears a hydroxyl group on a carbon atom α or β to the quinacridone nitrogen atom. These quinacridone pigments are useful in electrophoretic displays.

The present disclosure relates to polysiloxanes, processes for preparing polysiloxanes, and hydraulic fluids comprising polysiloxanes. This disclosure also relates to hydraulic fluids comprising one or more polysiloxane compounds and diphosphonate compounds, and to the use of diphosphonate compounds in hydraulic fluids or as additives or components in various compositions, for example to provide fire retardant properties to a fluid or composition. This disclosure also relates to use of the compositions as hydraulic fluids, which may be used in various machines, vehicles and craft, including aircraft.

An ultraviolet ray-curable silicone adhesive agent composition comprising (A) a polysiloxane represented by formula (1):

(R.sup.1SiO.sub.3/2).sub.a1(R.sup.1.sub.3SiO.sub.1/2).sub.b1(X.sup.1O.sub.1/2).sub.c1

(wherein R.sup.1 represents a monovalent hydrocarbon group wherein a methyl group accounts for 20 mol % or more and an alkenyl group accounts for 0.1 to 50 mol %; X.sup.1 represents a hydrogen atom or the like; a1 represents 0.1 to 1; b1 represents 0 to 0.75; and c1 represents 0 to 0.1; and the requirement represented by the formula: a1+b1+c1=1 is satisfied), (B) a polysiloxane represented by formula (2):

(R.sup.2.sub.3SiO.sub.1/2).sub.a2(R.sup.2.sub.2SiO).sub.b2

(wherein R.sup.2 represents a monovalent hydrocarbon group wherein a methyl group accounts for 20 mol % or more and an alkenyl group accounts for 0.01 to 25 mol %; a2 represents 0.001 to 0.67; b2 represents 0.33 to 0.999; and the requirement represented by the formula: a2+b2=1 is satisfied), (C) a hydrogen polysiloxane represented by formula (3):

R.sup.3.sub.dH.sub.eSiO.sub.[(4-d-e)/2]

(wherein R.sup.3 represents a monovalent hydrocarbon group; and d and e represent numerical values satisfying the requirements represented by the formulae: 0.7≤d≤2.5, 0.01≤e≤1.0 and 0.8≤d+e≤2.7) and (D) a platinum-group catalyst capable of being activated with light having a wavelength of 200 to 500 nm.

The ultraviolet ray-curable silicone adhesive agent composition can provide a cured article having excellent adhesion force to an object of interest even when being cured under room temperature.

A curable silicone composition is disclosed. The curable silicone composition comprises: (A) a silicone resin consisting essentially of R.sub.3SiO.sub.1/2 siloxane units and SiO.sub.4/2 siloxane units, wherein each R is the same or different, and independently selected from halogen-substituted or unsubstituted monovalent hydrocarbon groups free of aliphatic unsaturated bonds; (B) an organopolysiloxane having at least two alkenyl groups per molecule and free of SiO.sub.4/2 siloxane units in the organopolysiloxane; (C) an organosiloxane having at least three silicon atom-bonded hydrogen atoms per molecule; and (D) a hydrosilylation catalyst. The curable silicone composition can be cured to form a cured product having a high tensile strength in addition to a low modulus

A two-part RTV silicone is shown and described herein. In one aspect, provided is an electrostatically dissipative, two-part RTV silicone material. In embodiments, the silicone is white and exhibits a low thermal conductivity.

A bio-electrode composition contains: (A) a polymer compound containing a repeating unit-a having a structure selected from the group consisting of salts of ammonium, sodium, potassium, and silver formed with any of fluorosulfonic acid, fluorosulfonimide, and N-carbonyl-fluorosulfonamide; and (B) a silicone compound having a polyglycerin structure. This bio-electrode composition is able to form a living body contact layer for a bio-electrode which enable quick signal collection after attachment to skin.

This ultraviolet curable silicone adhesive composition that contains (A) an organopolysiloxane resin which contains (a) an R.sup.1.sub.3SiO.sub.1/2 unit (wherein R.sup.1 represents a monovalent hydrocarbon group) and (b) an SiO.sub.4/2 unit, and wherein the molar ratio of the unit (a) to the unit (b) is from 0.6:1 to 1.2:1, (B) a linear or branched organopolysiloxane which has a viscosity of more than 50 mPa.Math.s but 500,000 mPa.Math.s or less, while having 1-4 groups represented by formula (1) and/or (2) ##STR00001##
(wherein R.sup.2 represents H or Me, a represents a number of 1-3, and the broken line represents a bonding hand that is bonded with Si)
as Si-bonded groups, and wherein the main chain is composed of repeated diorganosiloxane units, and (C) a reactive diluent which is composed of an organo(poly)siloxane that has a viscosity of 1-50 mPa.Math.s, while having one group represented by formula (3) ##STR00002##
(wherein a is as defined above, and the broken line represents a bonding hand)
at an end of the molecular chain or in a molecular side chain as an Si-bonded group, is rapidly cured by means of irradiation of ultraviolet light, and exhibits good adhesion to a sheet-like substrate.

An object of the present invention is to provide a conductive silicone composition that is cured at a low temperature in a short time and from which a cured product having excellent conductivity can be obtained. A conductive silicone composition containing (A) to (E) components described below and containing greater than or equal to 10 parts by mass and less than 100 parts by mass of the (D) component with respect to 100 parts by mass of the (A) component: (A) component: a polyorganosiloxane having one or more alkenyl groups in a molecule (B) component: a compound having a hydrosilyl group (C) component: a hydrosilylation catalyst (D) component: a silane compound having an epoxy group and an alkoxysilyl group (E) component: a conductive powder.

A polydiorganosiloxane having both a silicon bonded aliphatically unsaturated group and a silicon bonded poly(meth)acrylate polymer or copolymer is useful in a polyorganosiloxane hybrid pressure sensitive adhesive composition that cures to form a polyorganosiloxane hybrid pressure sensitive adhesive. The polyorganosiloxane hybrid pressure sensitive adhesive composition can be wet-cast or dry-cast on a substrate and cured to form a polyorganosiloxane hybrid pressure sensitive adhesive article. An adhesive article including the polyorganosiloxane hybrid pressure sensitive adhesive is also disclosed.