Branched organopolysiloxanes are prepared from alkoxysilanes and polydiorganosiloxanes over two stages by basic equilibration and subsequent acid-catalyzed reaction with water to the desired degree of condensation, wherein the entire process does not require the use of additional organic solvent, no wastewater is generated and the process is particularly suitable for the controlled production of so-called DT resins.

A (meth)acrylate functional silicone and method for its preparation are provided. This (meth)acrylate functional silicone may have pendant poly(meth)acrylate-functional groups. This (meth)acrylate functional silicone may have terminal alkenyl groups. This (meth)acrylate functional silicone may be used in pressure sensitive adhesives.

A (meth)acrylate functional silicone and method for its preparation are provided. This (meth)acrylate functional silicone may have pendant poly(meth)acrylate-functional groups. This (meth)acrylate functional silicone may have terminal alkenyl groups. This (meth)acrylate functional silicone may be used in pressure sensitive adhesives.

A composition comprises a first siloxane compound comprising at least one cyclic siloxane moiety and a first salt, the first salt comprising a conjugate base of a volatile organic acid. A method for producing a cross-linked siloxane network comprises the steps of providing a first siloxane compound comprising at least one cyclic siloxane moiety, providing a first salt comprising a conjugate base of a volatile organic acid, combining the first siloxane compound and the first salt to produce a reaction mixture, heating the reaction mixture to a temperature sufficient for the first salt to open the ring of the cyclic siloxane moiety, and maintaining the reaction mixture at an elevated temperature so that at least a portion of the opened cyclic siloxane moieties react with each other to produce a cross-linked siloxane network.

A composition comprises a first siloxane compound comprising at least one cyclic siloxane moiety and a first salt, the first salt comprising a conjugate base of a volatile organic acid. A method for producing a cross-linked siloxane network comprises the steps of providing a first siloxane compound comprising at least one cyclic siloxane moiety, providing a first salt comprising a conjugate base of a volatile organic acid, combining the first siloxane compound and the first salt to produce a reaction mixture, heating the reaction mixture to a temperature sufficient for the first salt to open the ring of the cyclic siloxane moiety, and maintaining the reaction mixture at an elevated temperature so that at least a portion of the opened cyclic siloxane moieties react with each other to produce a cross-linked siloxane network.

The present invention relates to a semiconductor nanocrystal-siloxane composite resin composition and a preparation method thereof, and more specifically to a semiconductor nanocrystal-siloxane composite resin composition in which semiconductor nanocrystals are dispersed and bonded to a siloxane composite resin obtained by condensation reaction of a mixture of one or more organoalkoxysilanes or organosilanediol, and a preparation method thereof. The cured product of the semiconductor nanocrystal-siloxane resin composition of the present invention can be prepared as a coating, a film, a flake, etc., and the inherent characteristics of the semiconductor nanocrystal are maintained in a high temperature and high humidity environment and the reliability of the application devices is improved.

The present invention relates to a semiconductor nanocrystal-siloxane composite resin composition and a preparation method thereof, and more specifically to a semiconductor nanocrystal-siloxane composite resin composition in which semiconductor nanocrystals are dispersed and bonded to a siloxane composite resin obtained by condensation reaction of a mixture of one or more organoalkoxysilanes or organosilanediol, and a preparation method thereof. The cured product of the semiconductor nanocrystal-siloxane resin composition of the present invention can be prepared as a coating, a film, a flake, etc., and the inherent characteristics of the semiconductor nanocrystal are maintained in a high temperature and high humidity environment and the reliability of the application devices is improved.

A method of producing a polycarbonate-polyorganosiloxane copolymer, including: a step (a) of obtaining a solution containing a polycarbonate-polyorganosiloxane copolymer through use of an alkaline aqueous solution of a dihydric phenol, phosgene, a polyorganosiloxane, and an organic solvent; a step (b) of continuously or intermittently draining the solution containing the copolymer from step (a), followed by separation of the drained solution into an aqueous phase and an organic phase to provide the organic phase with copolymer; and a step (c) of concentrating the organic phase with the from step (b) to remove the organic solvent, before heating the organic phase to a boiling region in the step (c), a viscosity of the organic phase being adjusted to 70 cP or less at 35° C., the polycarbonate-polyorganosiloxane copolymer obtained by the steps (a) to (c) including a polycarbonate-polyorganosiloxane copolymer containing a specific polycarbonate block (A) and a specific polyorganosiloxane block (B).

A silicone polymer production method achieves a significantly improved yield due to the needlessness of a rinsing step and can produce a stable silicone polymer. The production method for a silicone polymer includes a step of preparing at least one silane compound selected from the compounds represented by general formula (1); R.sub.aSi(OR.sup.1).sub.4-a (1), wherein R is a hydrogen atom or a monovalent organic group, R.sup.1 is a monovalent organic group, and a is an integer of 1 or 2 and the compounds represented by general formula (2); Si(OR.sup.2).sub.4 (2), wherein R.sup.2 is a monovalent organic group, a step of hydrolyzing it with a quaternary ammonium compound in the presence of water, and a step of bringing it into contact with a cation exchange resin.

A silicone polymer production method achieves a significantly improved yield due to the needlessness of a rinsing step and can produce a stable silicone polymer. The production method for a silicone polymer includes a step of preparing at least one silane compound selected from the compounds represented by general formula (1); R.sub.aSi(OR.sup.1).sub.4-a (1), wherein R is a hydrogen atom or a monovalent organic group, R.sup.1 is a monovalent organic group, and a is an integer of 1 or 2 and the compounds represented by general formula (2); Si(OR.sup.2).sub.4 (2), wherein R.sup.2 is a monovalent organic group, a step of hydrolyzing it with a quaternary ammonium compound in the presence of water, and a step of bringing it into contact with a cation exchange resin.