Provided is a method for preparing a (meth)acryloyl group-containing organopolysiloxane having a step of transesterification between the components (a1) and (a2) in the presence of the components (a3) and (a4) to obtain the (meth)acryloyl group-containing organopolysiloxane, wherein component (a1) is an organopolysiloxane represented by the average composition formula (1) which has a hydroxy group-containing group, component (a2) is a (meth)acrylic acid ester represented by the general formula (2), component (a3) is a zirconium metal complex in an amount such that a molar ratio of component (a3) to the hydroxy group of component (a1) is 0.001 to 0.1, and component (a4) is a hydroxy group-containing amine represented by HON(R.sup.4).sub.2 in an amount such that a molar ratio of component (a4) to component (a3) is 0.10 to 1.5, wherein R.sup.4 is, independently of each other, a linear or branched aliphatic hydrocarbon group having 1 to 6 carbon atoms.

Provided is a method for preparing a (meth)acryloyl group-containing organopolysiloxane having a step of transesterification between the components (a1) and (a2) in the presence of the components (a3) and (a4) to obtain the (meth)acryloyl group-containing organopolysiloxane, wherein component (a1) is an organopolysiloxane represented by the average composition formula (1) which has a hydroxy group-containing group, component (a2) is a (meth)acrylic acid ester represented by the general formula (2), component (a3) is a zirconium metal complex in an amount such that a molar ratio of component (a3) to the hydroxy group of component (a1) is 0.001 to 0.1, and component (a4) is a hydroxy group-containing amine represented by HON(R.sup.4).sub.2 in an amount such that a molar ratio of component (a4) to component (a3) is 0.10 to 1.5, wherein R.sup.4 is, independently of each other, a linear or branched aliphatic hydrocarbon group having 1 to 6 carbon atoms.

Described herein are antimicrobial ophthalmic devices comprising a silicone hydrogel composition and an antimicrobial agent, and methods of making and use thereof. The silicone hydrogel compositions comprise an actinically-crosslinkable polysiloxane-polyglycerol block copolymer crosslinked with a crosslinker. The actinically-crosslinkable polysiloxane-polyglycerol block copolymer being derived from: a polysiloxane prepolymer comprising a polyglycerol side chain, the polyglycerol side chain comprising an ethylenically unsaturated group covalently linked thereto, wherein the ethylenically unsaturated group is actinically curable.

Provided is an ultraviolet curable silicone composition capable of being ejected via inkjet ejection. The ultraviolet curable silicone composition contains: (A) a one-end polymerizable organopolysiloxane represented by the following formula (1) wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a linear or branched alkyl group having 1 to 20 carbon atoms, or an aryl-containing group having 6 to 10 carbon atoms; R.sup.6 represents a divalent organic group having 2 to 20 carbon atoms; R.sup.7 represents an alkylene group having 2 to 20 carbon atoms; R.sup.8 represents a hydrogen atom or a methyl group; n is a number of 1 to 500; X represents an alkylene group having 2 to 20 carbon atoms; Y represents —OCH.sub.2CH.sub.2—, —OCH(CH.sub.3)CH.sub.2— or —OCH.sub.2CH(CH.sub.3)—; p is a number of not smaller than 1; Z is —O— or —NH—; and (B) a photopolymerization initiator.

One of the purposes of the present invention is to provide a silicone which has polymerizable groups at the both terminals and an amphiphilic side chain and which provides a copolymer having high surface wettability. The present invention provides a silicone represented by the formula (1): in the formula (1) R.sup.1 is a group represented by the following formula (2): wherein n is an integer of 2 to 8 and R.sup.4 is a methyl group or a hydrogen atom, “a” is an integer of 1 to 500, b is an integer of 1 to 100, provided that a+b is 50 to 600, the siloxane units in the aforesaid parentheses may be bonded in a block or at random, R.sup.2 is, independently of each other, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R.sup.3 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, A.sup.1 is a group represented by the formula (3) or (3′): wherein R is a hydrogen atom or a methyl group, B.sup.1 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an acyl group having 1 to 6 carbon atoms, m is an integer of 0 to 8, p is an integer of 1 to 10, q is an integer of 1 to 50, and the polyether units in the parentheses are bonded in the above-described order.

A curing reactive silicone gel is provided. The curing reactive silicone gel is obtained by primarily curing a composition containing the following components in a gel form and further having secondarily curing reactivity. (A) an organopolysiloxane having at least two curing reactive groups in one molecule; (B) optionally, an organohydrogenpolysiloxane; and (C) a curing agent.

Provided are a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising a core-corona polymer particle excellent in emulsion stability and feeling of use. Certain embodiments of the present invention provides a raw material for a cosmetic, comprising a core-corona polymer particle dispersion obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

According to the present invention, an ultraviolet curable silicone composition for stereolithography, which contains

(A) an organopolysiloxane that has two groups represented by formula (1)

##STR00001##

(wherein each R.sup.1 independently represents a monovalent hydrocarbon group having 1-20 carbon atoms; R.sup.2 represents an oxygen atom or the like; R.sup.3 represents an acryloyloxyalkyl group or the like; p represents a number satisfying 0≤p≤10; and a represents a number satisfying 1≤a≤3) in each molecule,
(B) an organopolysiloxane resin that is composed of (a) a unit represented by formula (2)

##STR00002##

(wherein R.sup.1-R.sup.3, a and p are as defined above), (b) an R.sup.4.sub.3SiO.sub.1/2 unit (wherein each R.sup.4 independently represents a monovalent hydrocarbon group having 1-10 carbon atoms) and (c) an SiO.sub.4/2 unit, and wherein the molar ratio of the total of the unit (a) and the unit (b) to the unit (c) is within the range of 0.6-1.2:1 and
(C) a photopolymerization initiator has a viscosity that is applicable to a stereolithography system such as lifting system and forms a cured product which has excellent physical properties of rubber.

Described herein are compositions comprising an actinically-crosslinkable polysiloxane-polyglycerol block copolymers, methods of making and use thereof, and devices comprising the compositions described herein. Disclosed herein are compositions comprising an actinically-crosslinkable polysiloxane-polyglycerol block copolymer derived from: a polysiloxane prepolymer comprising a polyglycerol side chain, the polyglycerol side chain comprising an ethylenically unsaturated group covalently linked thereto, wherein the ethylenically unsaturated group is actinically curable.

A polysiloxane-polyalkylene glycol block copolymer is obtained by reacting a polysiloxane (A) having any functional group selected from a carboxylic anhydride group, a hydroxyl group, an epoxy group, a carboxyl group, and an amino group with a polyalkylene glycol (B) having any functional group selected from a carboxylic anhydride group, a hydroxyl group, a carboxyl group, an amino group, an epoxy group, a thiol group, and an isocyanate group, wherein a content of a structure derived from the polysiloxane (A) is 20% by mass or more and 90% by mass or less with respect to 100% by mass of the polysiloxane-polyalkylene glycol block copolymer.