A toner comprising a toner particle and an external additive, wherein the external additive comprises a composite particle comprising an organosilicon polymer fine particle covering a surface of an alumina particle, a coverage ratio of the surface of the alumina particle with the organosilicon polymer fine particle is 1 to 50 area %, and given A (nm) as a number-average particle diameter of primary particles of the organosilicon polymer fine particle and B (nm) as a number-average particle diameter of primary particles of the alumina particle, following formulae (I) and (II) are satisfied:

A≤90  (I)

100≤B≤1000  (II).

Branched organopolysiloxanes and organopolysiloxanes with low alkoxy content are produced in a first reaction unit by continuous feed of organohalosilanes and alcohol to a reaction vessel surmounted by a distillation column, the vessel containing an excess of water relative to the halogen content of the organohalosilanes. A second reaction unit for removing volatiles from the product from the first reaction unit is also preferably employed.

This polysiloxane: comprises a hydrolytic condensation product of a silicon compound that contains a cyclic alkoxysiloxane represented by formula (1) ##STR00001##
(in the formula, R.sup.1 groups each independently denote a substituted or unsubstituted alkyl group having 1-3 carbon atoms, R.sup.2 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 R.sup.1 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.

Provided are a silicone-based adhesive protection film and an optical member comprising same, the protection film being formed of a composition comprising an alkenyl group-containing organic polysiloxane, an organic polysiloxane resin, a siloxane-based ionic compound, a cross-linking agent, and a hydrosilylation catalyst, wherein the organic polysiloxane resin includes an organic polysiloxane resin comprising a R.sup.1R.sup.2R.sup.3SiO.sub.1/2 unit (R.sup.1, R.sup.2, and R.sup.3 are each independently an alkyl group having 1 to 6 carbon atoms) and a SiO.sub.4/2 unit.

A silsesquioxane resin, photoresist composition comprising the silsesquioxane resin and a photoacid generator, etching mask composition comprising the silsesquioxane resin, products prepared therefrom, methods of making and using same, and manufactured articles and semiconductor devices containing same. The silsesquioxane resin comprises silicon-bonded hydrogen atom T-units and T-units having a silicon-bonded group of formula —CH.sub.2CH.sub.2CH.sub.2CO.sub.2C(R.sup.1a).sub.3 or —CH(CH.sub.3)CH.sub.2CO.sub.2C(R.sup.1a).sub.3, wherein each R.sup.1a is independently an unsubstituted (C.sub.1-C.sub.2)alkyl.

A composition for use in modifying the adhesion properties of silicone rubber compositions is described. The composition comprises alkoxy silanes, such as alkoxy silanes further comprising additional chemical functional groups such as epoxides, esters, and anhydrides; diffusion promoters that are completely or partially immiscible in the silicone rubber composition being modified; and compounds that can balance the hydride content of the silicone rubber compositions being modified. Modified curable silicone rubber compositions and methods of modifying the adhesive properties of silicone rubber compositions are also described. In particular, use of the presently disclosed compositions can provide modified silicone rubber compositions having selective adhesion for surfaces comprising thermoplastic and thermoset polymers as compared to metal surfaces.

Provided is a curable silicone composition and uses thereof. The composition which has hot-melt properties, strongly adheres to poorly adhesive substrates, and is particularly superior in flexibility and toughness at high temperatures from room temperature to approximately 150° C. in cured products such as overmolding, in addition to providing a cured product that does not easily warp or become damaged even when integrally molded with a lead frame or the like. The composition comprises: (A) organopolysiloxane resin microparticles where 20 mol % or more of all siloxane units is siloxane units represented by RSiO.sub.3/2 where R is a monovalent hydrocarbon group; (B) a silatrane derivative or a carbasilatrane derivative; (C) a curing agent; and (D) a functional inorganic filler. The content of component (D) is 50% or more by volume relative to the overall composition. The composition is solid at 25° C. and has hot-melt properties at a temperature of 200° C. or lower.

A curable silicone adhesive composition comprising a heat stable siloxane-imide copolymer is shown and described herein. The composition includes an alkenyl silicone, a silicone hydride based cross linker, hydrosilylation catalyst and additives that is curable at relatively low temperatures and shows good heat stability.

A condensation curable silicone adhesive composition comprising a condensation curable organopolysiloxane, siloxane-imide crosslinker, a condensation catalyst and an additive is shown and described herein. The composition is curable at relatively room temperatures and shows good heat stability

A condensation curable silicone adhesive composition comprising a siloxane-imide base polymer, condensation curable organopolysiloxane crosslinker, a condensation catalyst and an additive is shown and described herein. The composition is curable at relatively room temperatures and shows good heat stability